Q: Are concealed push bar panic devices allowed for use on doors containing Georgia-Pacific Gypsum components?
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A: No.
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Q: Can I change an order? What is the latest date I can change an order?
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A: Changes may be made at your convenience until close of business on the Thursday prior to the week of shipment. After Thursday, we may not accept changes if your order has gone into production.
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Q: Can I have an “S” label on a 45, 60 and 90 minute door containing Georgia-Pacific Gypsum components?
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A: Yes, all 45, 60 and 90 minute fire doors containing Georgia-Pacific Gypsum components qualify for an “S” label opening, provided an appropriate fire-rated smoke and draft control gasket is used.
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Q: Can I use “Ving” type electronic locks?
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A: Yes, as long as the mortise cutout does not exceed that denoted in the Georgia-Pacific Gypsum specification.
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Q: Can I use metal edges on positive pressure pairs of doors?
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A: Only on 20 minute 8080 pairs.
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Q: Can I use more than 100 square inches of glazing in 60 and 90 minute fire doors?
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A: Yes, the doors would not be considered temperature rise per NFPA 80.
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Q: Can I use surface astragals?
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A: Yes, on all doors.
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Q: Can we use 4” hinges?
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A: Hinges must conform to NFPA 80 table 2-8.1.1 requirements.
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Q: Can we use concealed closing devices in positive pressure doors?
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A: No, there are no approvals at this time for concealed closing devices tested to positive pressure requirements.
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Q: Can we use fire doors made with Georgia-Pacific Gypsum components for fire rated doors for exterior applications
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A: No, Georgia-Pacific Gypsum components for fire-rated doors are not intended to be used in exterior applications.
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Q: Can we use frames other than 16 gauge steel frames with Georgia-Pacific Gypsum approvals?
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A: Yes, as long as they are labeled and listed for use with fire doors containing Georgia-Pacific Gypsum components for fire doors. Check the frame manufacturer's listing or contact us.
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Q: Do I have to arrange transportation of my order?
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A: All orders are shipped FOB our plant location. You may arrange your own carrier or have us make the selection. Orders must ship within 48 hours of completion. All orders are shipped “freight collect”.
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Q: Do I need to use an approved adhesive to glue the stiles and rails to the core?
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A: An approved adhesive is not required. Approved adhesives are only required for door faces.
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Q: Do I need to use intumescent to build positive pressure doors?
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A: The choice is yours. Georgia-Pacific has certifications that do not require the use of intumescent in the door or on the frame. Certifications are also available for doors and frames constructed with intumescent.
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Q: Do the intumescent free approvals require a smoke control gasket at the meeting edges of pairs?
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A: The Pemko S77 meeting edge smoke control gasket is only required if a smoke and draft control opening has been specified. Concealed intumescent is still required on all 45, 60 and 90 minute meeting edges.
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Q: Do wood and steel doors that contain Georgia-Pacific Gypsum components meet the 250 degree F @ 30 minutes temperature rise requirement?
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A: Yes
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Q: Do you export product?
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A: We will quote export orders directly on an order-by-order bais. Quotes are provided on a DES ("Delivered Ex-Ship") term to a Port of Foreign Destination.
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Q: Do you have EDI capabilities?
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A: Yes. For invoicing only at this time.
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Q: Does Georgia-Pacific produce and sell fire doors?
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A: Georgia-Pacific does not compete with its customers. Our focus is to sell the best components to the very best door manufacturers in the world.
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Q: Does mineral core or Firestop contain asbestos?
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A: No. Never has never will.
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Q: How do I get certified to use Georgia-Pacific fire door products?
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A: First, you will need to obtain an updated “Authorization to Mark” form signed by your listing agency representative. Second, you will need to obtain labels from the certifying agency you determine meets your needs. Third, you will need to obtain updated specifications that include procedures for products complying with Georgia-Pacific certifications. You will be required to have a written authorization from Georgia-Pacific Gypsum.
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Q: How much lead time do I have to give the plant when placing an order?
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A: Normal lead time is one week. An order placed by Thursday will ship from our plant by Friday of the following week. During very busy periods this may extend by one week, not more.
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Q: How much wood after trim is allowed on a positive pressure stile?
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A: ¼ inch.
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Q: Is kerfed core available for hot pressing?
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A: Yes
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Q: Should hardware-mounting holes be pre-drilled?
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A: Yes, pilot holes must be pre-drilled.
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Q: Should I use blocking at hardware locations?
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A: Georgia-Pacific Gypsum recommends the use of blocking to ensure long term serviceability.
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Q: What happens if the product is damaged when I receive it? What happens if I have a claim?
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A: Since orders are shipped FOB our location and freight collect, it is your responsibility to file claims for shipment damage directly with the carrier.
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Q: What is a smoke control door?
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A: A fire rated door used in conjunction with a listed smoke and draft control gasket.
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Q: What is a temperature rise door?
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A: A fire door that by code, meets a maximum unexposed surface temperature requirement at a specified time interval during the fire test. (i.e. 250 deg @ 30 minutes)
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Q: What is required for an opening to qualify for an “S” label?
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A: A fire-rated smoke and draft control gasket system would need to be applied to the perimeter and the meeting edges of pairs. The smoke and draft control gasket must be “listed” for compliance with UBC Standard 7-2-1997, Parts I and II.
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Q: What is the best way to machine Firestop® material?
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A: Diamond or industrial grade carbide tooling. Reducing the feed rate and lowering the tool rpm will increase tool life and reduce dust.
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Q: What is the difference between Category “A” and Category “B” fire doors?
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A: A Category “A” fire door does not require an additional edge sealing system. A Category “B” fire door requires an additional field applied edge sealing system.
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Q: What is the minimum number of doors per a specification?
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A: There is no minimum per size or specification provided you order at least 40 total cores. There is an upcharge for less than ten pieces of a size and rating.
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Q: What is the minimum quantity I can order?
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A: One pallet of 40 pieces of mineral core.
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Q: What is the normal packaging for the material? Do I have to pay extra for packaging?
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A: All products for full truckloads are shipped on pallets. LTL (less than truckload) shipments are stretch wrapped at no extra charge. LTL orders are crated to protect them from damage and extra charges may apply. You will be informed of any crating charges prior to time of shipment.
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Q: What is the pre-drilled screw hole diameter?
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A: For a #12 hinge screw Georgia-Pacific Gypsum recommends a 5/32-inch pilot hole. Other screws, the pilot should be 85-90% of the root diameter of the screw.
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Q: What is the STC rating of doors made with Georgia-Pacific Gypsum components?
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A: Because Georgia-Pacific Gypsum does not make doors, we urge our customers to obtain their own STC ratings with sound gasket systems of their choice.
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Q: What kinds of door skins can be used with Georgia-Pacific Gypsum
fire door components?
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A: The majority of architectural wood flush doors use a wide variety of wood veneer species. The most popular veneers being Red Oak and Birch. High-pressure laminates (HPL) are approved, but make up a much smaller portion of the market. Molded hardboard door skins and fiberglass are also options.
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Q: When I machine for hinges, sometimes I go through the wood into the composite material. Does this affect the door’s rating? Will it affect screw holding?
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A: No, wood is combustible and does not contribute in any way to a door’s fire rating. No, GP Firestop edge banding is designed to provide adequate screw holding without any wood.
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Q: When I machine for hinges, sometimes I go through the wood into the composite material. Does this affect the door's rating? Will it affect screw holding?
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A: No, wood is combustible and does not contribute in any way to a door's fire rating. No, Georgia-Pacific Gypsum Firestop® edge banding is designed to provide adequate screw hoolding without any wood.
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Q: Which testing organizations and code approvals certify door assemblies containing FireDefender® components?
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A: The two main certifying agencies in the United States are: Intertek ETL-Semko (ITS) and Underwriters Laboratories (UL). U.S. codes tested to include; ASTM E-152, UBC 7-2 (1997), UBC 43-2, UL 10b and UL 10c, NFPA 252, International testing codes include; British Standard 476 Part 22, Japanese Industrial Standard, CSFM 12-43-4, Can4 S104.
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Q: Who builds doors using Georgia-Pacific Gypsum components for fire-rated doors?
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A: Many of the major door manufacturers in the United States. A map with location and contact information for some of the leading manufacturers is contained in this web site.
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Q: Whom do I contact at Georgia-Pacific Gypsum to become certified to build fire door assemblies and purchase product?
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A: The sales department located in Atlanta, Georgia will assist you in meeting the requirement necessary to get you started. Sales can be reached at 404-652-2518; fax 404-588-3833.
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Q: What is Gypsum?
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A: A white mineral that is milled, heated, hydrated and formed into drywall; or used to manufacture plaster.
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Q: What is wallboard?
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A: A manufactured sheet material made from a variety of items including gypsum and wood fibers used to cover large areas.
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Q: Does DensArmor Plus® Abuse Guard® drywall have the same fire ratings as DensArmor Plus® drywall?
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A: Yes, it has all the same features and benefits as DensArmor Plus® drywall, with the addition of abuse resistance.
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Q: How do the product enhancements to DensArmor Plus® Abuse Guard® drywall affect its moisture and mold resistance?
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A: The abuse resistance enhancements to DensArmor Plus® Abuse Guard® drywall in no way affect the panel's mold resistance. The glass mat facings on both sides of the panel, plus the treated, moisture-resistance core provide the mold resistance properties of the product.
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Q: How is DensArmor Plus® Abuse Guard® drywall different than 5/8" DensArmor Plus® drywall?
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A: DensArmor Plus® Abuse Guard® drywall has a thicker fiberglass back mat and denser core, than DensArmor Plus paperless interior drywall. Our abuse-resistant product can stand up to high traffic and resists surface indentation and scuffs that can cause costly repairs and maintenance. Both products are more abuse resistant that traditional paper faced drywall.
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Q: Is DensArmor Plus® Abuse Guard® drywall considered impact resistant?
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A: No. It is not tested for hard body impacts.
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Q: Is DensArmor Plus® Abuse Guard® drywall tested for VOCs (volatile organic compounds)?
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A: DensArmor Plus® Abuse Guard® drywall is GREENGUARD and GREENGUARD Schools and Children (sm) certified as a low emitting product, which means the product met stringent tested by the Greenguard Environmental Institute for VOC emissions.
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Q: What makes DensArmor Plus® Abuse Guard® drywall abuse resistant?
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A: A more dense core and fiberglass mat facings enable the product to meet stringent standards for abrasion, indentation, and soft body impact resistance. DensArmor Plus drywall meets a Level 3 for surface abrasion; Level 1 when tested for surface indentation; and Level 1 for soft-body impact, all when tested in accordance with ASTM C 1629.
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Q: Can a contractor use DensArmor Plus® in a pool area, or a pump house and other areas of extreme moisture?
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A: DensArmor Plus® is a suitable panel to replace green board. It should not be specified in areas that will see moisture levels higher than that of a residential bathroom. For pool areas, see DensShield® Tile Backer.
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Q: Can DensArmor Plus® be used anywhere else besides the interior of the exterior wall?
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A: Yes; any interior wall, basement wall or ceiling that is at risk of moisture are sound applications.
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Q: Can DensArmor Plus® be used as an exterior sheathing?
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A: No. DensArmor Plus® should not be used on exterior applications.
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Q: Can DensArmor Plus® be used in an exterior soffit?
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A: Yes, DensArmor Plus® is suitable for soffit applications where it is not exposed directly to the elements. It can be finished using a setting-type joint compound prior to priming and painting.
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Q: Can veneer plaster be applied over DensArmor Plus® paperless drywall?
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A: Yes. Where DensArmor Plus® paperless drywall is to receive a veneer plaster, longer working or open time as well as longer drying times can be expected due to the product's superior moisture-resistance properties. Veneer plasters adhere well to DensArmor Plus panels. Always apply veneer plaster systems according to the manufacturer's recommendations.
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Q: How do you install and fasten DensArmor Plus® panels?
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A: DensArmor Plus® drywall scores, cuts and fastens like traditional gypsum wallboard. Conventional drywall nails and screws are used to fasten it. Download the Wallworks Guide (PDF: 1.5MB/8pgs) for complete instructions.
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Q: How does one finish DensArmor Plus® paperless drywall?
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A: Download the Wallworks Guide (PDF: 1.5MB/8pgs) for complete instructions.
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Q: Is DensArmor Plus® drywall mold-proof?
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A: No, it is mold-resistant (tested, as manufactured, per ASTM D 3273). Mold can grow on virtually any surface when exposed to the right elements.
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Q: Is there a mold warranty for DensArmor Plus® drywall?
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A: There is no mold warranty. However, DensArmor Plus® drywall carries a three-month in-place exposure limited warranty and a three-year in-place (free from manufacturing defects) limited warranty (PDF: 496KB/1pg).
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Q: Is there an MSDS sheet available for DensArmor Plus® drywall?
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A: Yes, MSDS sheet #72 for DensArmor Plus® drywall is the same for all other Dens™ paperless glass-mat gyspum products. Click to download the PDF
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Q: What are the similarities and differences in DensArmor Plus® interior drywall panels and DensShield® tile backer?
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A: DensShield® tile backer and DensArmor Plus® drywall similarities: Both use coated glass mats as the back facer material. When installed against the wall framing, both products provide a glass mat surface facing the wall cavity that resists possible mold growth on the back of the panel. DensShield and DensArmor Plus both have cores that are moisture resistant, manufactured to ASTM C 630 specifications. DensShield and DensArmor Plus differences: DensArmor Plus does not have a water-stopping acrylic coating. The coating on DensShield provides a water barrier to stop moisture from penetrating into the product and wall. DensShield is made to be used in wet areas such as showers and tub areas as a substrate for ceramic tile. DensShield is manufactured to ASTM C 1178. DensArmor Plus features a tapered edge for joint finishing while DensShield has a square edge.
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Q: What are the wicking characteristics of DensArmor Plus® panels?
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A: With its moisture-resistant core and the absence of paper facings, DensArmor Plus® drywall resists wicking similar to DensShield® Tile Backer. (.31" over 24 hr. period)
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Q: What is the perm rating for DensArmor Plus® paperless drywall?
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A: DensArmor Plus® paperless drywall is permeable. It will achieve the same as DensGlass Gold® exterior sheathing: 1/2" = 23; 5/8" = 12. DensArmor Plus drywall does not provide a moisture barrier like DensShield® Tile Backer.
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Q: What is the STC (sound) rating on DensArmor Plus® paperless drywall?
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A: STC ratings for DensArmor Plus® paperless drywall are the same as ToughRock® gypsum board wall and ceiling assemblies.
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Q: What UL listings does DensArmor Plus® paperless drywall have? Are they marked on the product?
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A: We have UL Listings for DensArmor Plus® paperless drywall in the UL Fire Resistance Directory. Refer to the UL Web site at UL Report CKNX.R2717
- Gypsum Board. The UL stamp will be on the back of the board.
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Q: Which side is the back of the DensArmor Plus® panel?
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A: The Gold® color side of DensArmor Plus® panels with the product logo is the back of the panel and should be installed facing the framing or studs. The white side or front has tapered edges for finishing.
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Q: Which side of DensArmor Plus® paperless drywall panels should be painted or finished?
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A: Attach the DensArmor Plus® panel with the GOLD® color (or yellow) side of the panel facing the studs or furring strips. Paint or apply a finish to the white, tapered edge side of the drywall panel facing the interior of the room. For finsihing tips, download Installing, Finishing, Priming and Painting DensArmor Plus® Paperless Interior Panels (PDF: 168KB/2pgs).
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Q: Why does DensArmor Plus® drywall have two ASTM numbers?
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A: The C 630 refers to the moisture-resistant core. The C 1177 refers to the proven moisture- and mold-resistant paperless Dens™ technology.
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Q: Can shingles be nailed to DensDeck?
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A: At this time, we don’t have enough data to support the claim that a single or double layer of DensDeck, in combination with special fasteners, can hold shingles in place. Shingles can always be nailed through DensDeck into the wood deck below.
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Q: Does DensDeck® roof board meet the requirements of UL P-921?
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A: Although UL P-921 is a light-weight concrete listing over a steel deck, 5/8" DensDeck FireGuard® roof board has been tested in similar constructions by UL and found to be equivalent in fire performance to the assembly tested. For documentation on this equivalency testing, please call our Technical Hotline at 1-800-225-6119 (Monday - Friday 8AM - 5PM ET, except holidays).
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Q: How many fasteners are needed to achieve FMRC I-60 and I-90 psf wind uplift resistance when 1/4" DensDeck is used as an overlay board?
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A: The number of fasteners required to achieve I-60 and I-90 psf wind uplift resistance for 1/4" DensDeck overlayment depends on the type of membrane used. For mechanically attached roof coverings, only four fasteners per 4' x 8' sheet of 1/4" DensDeck are necessary. These fasteners keep DensDeck in place while the membrane is being attached. The number of fasteners needed to attach such membranes far exceeds the number of fasteners required to achieve 90 psf wind uplift rating.
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Q: How many fasteners are needed to achieve FMRC I-60 or I-90 for 1/2" or 5/8" DensDeck when used as an underlayment directly over a steel deck?
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A: To achieve an FM I-60 wind uplift resistance for 1/2" and 5/8" DensDeck when applied directly to a steel deck, use eight fasteners per 4' x 8' panel and 12 fasteners per 4' x 8' sheet for corner panels. To achieve FMRC Class I-90, eight fasteners for field panels and 12 fasteners for corner panels and all perimeter panels are needed. A Factory Mutual Research Corporation (FMRC) Class 1 rating means that the system qualifies for the lowest insurance rates by FM-affiliated insurance companies. Systems that don’t pass the Class 1 criteria are rated FM Class 2. Class 2 garners a higher insurance premium. FM uses a calorimeter test to classify systems as Class 1 or 2. (A calorie is a unit of heat energy.) In case of fire, 1/2" and 5/8" DensDeck applied directly to a steel deck will not let excessive heat escape to roof insulation and other components, which limits the damage. The numbers 60 and 90 are not wind velocities. They represent 60 and 90 pounds per square foot (psi) of negative force or the amount of uplift a roof experiences as a result of high-velocity winds. To illustrate this concept, think about an airplane on a runway. When the plane reaches a certain velocity, the speed of wind flowing over it creates enough negative pressure to lift the plane up in the air. Here’s another simple example: When the window of a fast-moving automobile is opened, light materials, such as loose papers, etc., fly out of the car. The high wind speed causes a negative force and, as a result, lighter objects get sucked out.
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Q: What is the function of a 1/4" DensDeck overlayment board?
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A: When 1/4" DensDeck is used over insulation and underneath a membrane, it is referred to as overlayment. It is also called a recover board. There are two main functions of 1/4" DensDeck overlayment. First, it delays the passage of fire or the transmission of temperature to the roof insulation and the rest of the roof assembly when fire starts outside the building. The other function is to provide a versatile surface for the application of the membrane. When roofs are recovered, the existing roof system is left in place (reroofing, on the other hand, involves tearing off the existing roof system to the deck assembly then installing a new roof). The new roof is applied after a “recover board” is installed to act as a membrane substrate. Recover boards must be able to withstand potential water entry, temperature extremes and maintain compressive strength. They also must possess excellent fire properties to achieve a Class A rating. 1/4" DensDeck offers all these features. UL Class A, B, C ratings refer to topside fire ratings. According to a UL 790 test report, if 1/4" DensDeck is used under a membrane, the roof assembly gets the same rating as that of the membrane. For instance, a Class C roof is to be recovered. Rather than taking the old and defective materials out (tear-off costs around $1 to $1.5/ sq. ft.), you can apply the 1/4" board over the old roof, saving time and labor. The result will be a Class C roofing system. If a Class A membrane is used over the 1/4" DensDeck, the entire roof assembly becomes Class A. Testing has proven that FTX cedar shakes with a Class B rating can achieve a Class A rating on the roof assembly when 1/4" DensDeck overlayment is used. This configuration is very popular on the West Coast.
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Q: What is the function of a 1/4" DensDeck underlayment?
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A: When you use DensDeck immediately above a steel deck underneath insulation, it is referred to as an underlayment. There are two major functions of 1/4" DensDeck underlayment. First, it acts as a thermal barrier. If a fire breaks out inside the building, the 1/4" DensDeck underlayment will delay the transmission of temperature to the roof insulation for at least 15 minutes. If there is no thermal barrier, the insulation likely will melt and drip inside the building, adding fuel to the fire. Second, a 1/4" DensDeck underlayment provides a strong and versatile surface for the application of insulation. DensDeck offers a suitable surface for subsequent roofing operations such as hot mopping, torch application, mechanical or adhesive application of vapor barriers, insulation, and/or membranes. UL 1256 is the qualifying test for DensDeck over the steel deck. If the flute span is more than 2 5/8" and less than 5" or if the deck is plywood, use 1/2" DensDeck.
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Q: Can I get a 2-hour fire rating on an exterior wall using DensGlass Gold sheathing?
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A: 5/8" DensGlass Gold is a UL classified Type X board. That means that 5/8" DensGlass Gold can substitute for 5/8" paper-faced Type X gypsum board in all generic fire-rated assemblies. To obtain a 2-hour fire rating on a wood or steel framed wall assembly, use two layers of Type X gypsum board on the inside and two layers of 5/8" DensGlass Gold on the outside. You also can get a 2-hour assembly by combining a base layer of 5/8" paper-faced sheathing followed by the outer layer of 5/8" DensGlass Gold.
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Q: Can I use DensGlass Gold as a roof board? How about its application in roof parapets?
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A: DensGlass Gold should not be used in a horizontal roof application. Based on the type of cladding, DensGlass Gold can be used in a roof parapet. If the same roof membrane will extend from the roof onto the parapet, DensDeck® Roof Board is the right choice.
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Q: Can we staple building paper or metal lath directly to DensGlass Gold sheathing?
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A: No. Building felt or building paper such as Tyvek as well as metal lath should not be attached to DensGlass Gold sheathing. DensGlass Gold is not a structural product. It does not offer enough holding power by itself. Such attachments should be made through DensGlass Gold to the framing behind. Felts and building paper are relatively light weight but mechanically fastening these to the framing members using screws and plates will ensure their long-term, in-place retention. Metal lath, with or without paper backing, should be tied following the system provider’s instructions. Lath transmits the weight of conventional portland cement stucco to the framing members.
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Q: How can you achieve high lateral wind load ratings with DensGlass Gold exterior sheathing?
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A: The highest ratings achieved by DensGlass Gold in recent testing was 136.7 psf, representing approximately 231 mph, using a safety factor of 3 for comparison. (Other safety factors can be used. MPH is calculated using Bernoulli's Equation, other methods are used as well.) This was achieved for a horizontal application of 5/8" DensGlass Gold, with studs at 8" on center, and screws at 4" on center. Please call Technical Services at 800-225-6119 to discuss the application before installation.
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Q: How well does DensGlass Gold exterior sheathing stand up to high wind loads?
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A: DensGlass Gold exterior sheathing has recently been tested in accordance with ASTM E 330, which evaluates the structural performance of exterior building materials under uniform static air pressure differences, using a test chamber. DensGlass Gold can withstand winds in excess of 155 mph, when installed horizontally with the property screws and spacing. Download a summary of recent product enhancements, including a wind chart (PDF: 419KB/4pgs).
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Q: Is DensGlass Gold exterior sheathing covered by a warranty?
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A: DensGlass Gold is covered by several warranties. First, DensGlass Gold offers a 12-month, weather exposure limited warranty against delamination, deterioration and decay. Second, Georgia-Pacific Gypsum warrants DensGlass Gold against manufacturing defects for five years. Finally, DensGlass Gold Exterior sheathing is covered by a 10-year limited warranty when used as a substrate for architecturally specified EIFS cladding.
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Q: Is it necessary to finish DensGlass Gold joints or use building paper?
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A: Both the 12-month exposure warranty and the 5/10-year warranty against manufacturing defects do not require finishing of DensGlass Gold joints. The main reason you might consider finishing sheathing joints is to prevent air infiltration or moisture penetration into the wall cavity. A joint is a mechanical opening and DensGlass Gold cannot control how tight or loose it may be. Poor workmanship, a rough field cut, misalignment with a crooked stud, etc., could allow air to infiltrate the wall cavity. In lieu of finishing the joints, DensGlass Gold sheathing can be wrapped in building paper such as Tyvek felt. While we do not require the use of building paper, it may be mandatory if local code requires it.
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Q: Which side of the DensGuard board should I finish?
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A: Tiles are applied to the blue side. For walls, DensGuard Tile Backer should always be hung with the blue side out and the gold side facing the studs. For floors, the blue side of the board should be facing up. The blue coating acts as a moisture barrier and is engineered for proper tile adhesion. If you have mistakenly hung the gold side out, you must remove the board and turn it around.
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Q: Can I install a radiant heating system with DensGuard tile backer?
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A: Yes, as long as the intended use will keep the temperature of the system below 125°F on a regular basis.
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Q: Can I use DensGuard tile backer in a steam room or sauna?
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A: First, we would like to provide a clear understanding of the difference between a steam room and a sauna. Steam bathing is distinguished from sauna bathing by the amount of moisture in the air and by the temperatures at which bathing takes place. The air in a sauna is very dry, aided by the wood construction of the walls and ceiling. The sauna usually operates in the temperature range of 175-190°F with low humidity. A steam bath operates in the 110-120°F temperature range with high humidity. DensGuard backer board is approved for use in a residential steam room with a maximum of 48 square feet, while it is not recommended for use in a sauna.
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Q: Do I need to caulk every fastener?
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A: No, simply spot the fastener heads with the tile adhesive, just prior to setting tile.
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Q: How do I paint DensGuard® tile backer?
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A: There are 2 methods to paint DensGuard tile backer:
1. For areas that will remain dry: skim coat with all-purpose joint compound. Allow to dry for 24 hours, sand, wipe clean, prime and paint.
2. In areas that may get wet: skim coat with a setting type joint compound. Allow to set, sand, wipe clean, prime and paint with water resistive paints.
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Q: Is a vapor barrier required behind DensGuard tile backer like it is for cement and fiber-cement board?
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A: Since the blue coating is a moisture barrier, no additional vapor barrier is required. If a vapor barrier is required by code, as is the case in some colder climates, simply slit the vapor barrier with a utility knife in each stud cavity. DensGuard becomes part of the continuous vapor barrier once the tile is set.
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Q: What do I do where the DensGuard tile backer meets the tub flange?
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A: There are 2 different methods to finish this area:
1. Place furring strips the same thickness as the flange on the studs prior to hanging the panel. Then attach the panel so that the edge is 1/8" above the tub deck. Fill gap with flexible sealant.
2. Hang DensGuard so that the edge of the panel meets with the top of the tub flange and caulk edge with flexible sealant. Pack gap between the edge of the tile backer panel and tub deck with thinset if needed to support tile.
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Q: What fasteners are recommended for DensGuard tile backer?
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A: Please see fastener guide in the installation instructions.
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Q: What is the difference between DensArmor Plus® paperless drywall and DensGuard® tile backer?
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A: DensGuard tile backer is engineered to be used in direct wet areas; the coating on the face of DensGuard is designed for proper tile adhesion and serves as a moisture barrier. Both products have fiberglass mats embedded into a moisture-resistant core. The face of DensArmor Plus drywall is designed to finish similar to regular drywall.
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Q: What is the difference between DensGuard tile backer and cement board or fiber-cement board?
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A: While cement-based backer boards are water-durable they do not contribute to proper moisture management. In order to prevent the passage of moisture into the tile assembly the Tile Council of North America requires the use of a membrane to block the passage of moisture, since both the wall cavity and the floor substrate are susceptible to moisture damage. DensGuard tile backer has a built-in moisture barrier on the face which protects the wall cavity and floor substrate. It is at least 30% lighter than leading cement-based boards and has a non-abrasive, moisture-resistant core. Cement board has a heavy, crumbly, abrasive core, which can scratch tubs and fixtures. In addition, unlike cement-based backers, DensGuard backer board does not require any special tools or fasteners to cut and install.
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Q: What is the difference between DensGuard tile backer and greenboard?
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A: Greenboard is a paper-faced, moisture-resistant product no longer listed in the International Residential Code (IRC) or International Building Codes (IBC) for use in wet areas. DensGuard tile backer has fiberglass mats rather than paper, which removes a potential food source for mold. Also the core has been engineered to provide a greater moisture resistance than greenboard and in addition there is a moisture barrier on the face to help prevent moisture from entering the wall cavity. Finally DensGuard meets ASTM C1178 which is listed in the IRC and IBC code for use in direct wet areas.
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Q: What should I do if I countersunk the fasteners?
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A: Add an additional fastener about a 1" away. Cover the nail head with tile adhesive prior to tile application.
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Q: What should I do if there are gaps in between the panels?
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A: Seams should always be taped and filled with tile adhesive.
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Q: What type of caulk do I use to seal the joint?
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A: Use a flexible tub and tile caulk available in the paint department at Lowe’s Home Improvement Warehouses.
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Q: Where can I buy DensGuard tile backer?
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A: DensGuard® tile backer is sold exclusively at Lowe’s Home Improvement Warehouses.
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Q: Can I paint DensShield® tile backer outside the shower area in a typical residential bathroom wall installation?
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A: Yes, the steps to accomplish this are quite simple. First, finish the joints using fiberglass mesh tape and setting type joint compound. Next, skim the entire DensShield panel surface with setting compound. Once this material dries out, prime and paint, or prime and paper. The use of setting type joint compounds are preferred over ready mix joint compounds near moist areas.
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Q: Can I use DensShield® tile backer on the exterior of a building as a tile backer or as a base for EIFS?
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A: No, DensShield is not for exterior use.
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Q: Can you use DensShield for non-tile finish systems?
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A: Please refer to our technical brochure for using DensShield in indoor swimming pools, gang showers, car washes, food processing units, laboratories, other consistently humid areas and under surfaces that will be washed on a regular basis. Refer to the complete technical guide (PDF: 1.3MB/12pgs) for information.
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Q: Does DensShield come with a warranty?
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A: DensShield Tile Backer has a lifetime limited warranty when used in a residential tile installation.
Download the limited warranty (PDF: 554KB/2pgs).
Download the 20 year commercial warranty (PDF: 459KB/1pg).
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Q: How do I finish DensShield® tile backer joints?
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A: Apply standard 2" 10 x 10 woven glass mesh tape over joints and angles. This is the same type of tape used for taping cement board joints. Then, embed the tape with the same material used to set the tiles. Do not use all-purpose drywall compound. Pull setting materials tightly over the joints to reduce crown in the joint area.
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Q: How does DensShield® tile backer compare with cement board?
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A: DensShield Tile Backer has a built-in moisture barrier and therefore does not require a secondary moisture barrier. Cement board does not have a built-in moisture barrier and may require a secondary moisture barrier. In addition, DensShield has a considerable weight advantage over cement backers. It's 30% lighter than the leading cement board brands (1/2" comparison). That makes DensShield easier to handle on the job site and faster to install. A study conducted by the National Association of Home Builders (NAHB) Research Institute showed that DensShield is 46 percent faster to install than cement board.
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Q: If the grey coating on DensShield® tile backer is torn, can I fix it, or do I need to replace the board?
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| A: There are two ways to accomplish this repair. The first method is the best one. The second method is recommended for residential applications only. Depending on the size and extent of the damage, the second method may not be effective.
Method 1: Remove affected tile area and surrounding tiles from stud to stud. This includes removing the DensShield panels. Fasten additional studs, known as "scabs," to the sides of the original studs to support the new DensShield. Install DensShield panels. Caulk the edges of the new DensShield with a silicone sealant caulk so the joint is waterproof. After caulk has cured, install new tiles and grout.
Method 2: Remove grout from around the affected area. Carefully score through the acrylic finish of DensShield panels under the affected area. Remove the tile, including the gray acrylic DensShield finish. Do not remove the DenShield panels. Use a penetrating sealer/primer such as shellac primer or solvent-based primer to seal the exposed DensShield core. Install the tile with either a mastic or modified thin-set. Regrout the area.
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Q: To which side of DensShield tile backer should I apply tiles?
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A: The DensShield panel should be positioned next to framing with the coated (grey) side facing away from the studs. Apply mortar or mastic and tile to the coated (grey) side of DensShield. The acrylic coating stops moisture penetration on the surface.
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Q: What is 90 compound and where is it used?
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A: There are two different types of joint compounds: drying and setting types. Drying type compounds are composed of limestone and binder. These compounds work best with paper tape and must dry out completely before the binder becomes effective. Setting compounds set hard prior to drying, much like concrete and are more resistant to moisture than drying type compounds. Setting compounds work well with fiberglass mesh tape. ToughRock™ 90, the Georgia-Pacific Gypsum brand of setting compound, is recommended for skim coating DensShield® tile backer.
Click here for installation instructions
(PDF: 670KB/12pgs).
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Q: What makes DensShield® tile backer different from greenboard (paper-faced moisture-resistant gypsum board)?
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A: DensShield Tile Backer is an entirely different product than greenboard. The paper facings of greenboard can wick water, and can delaminate when exposed to moisture, causing tile failure. Greenboard is not recommended for use in extreme high moisture (wet) areas and therefore does not meet the 2006 IRC Section R702.4.2 for backer for wall tile in tub and shower areas. DensShield Tile Backer has a heat-cured acrylic coating over its face mat with face and back mats made of fiberglass instead of paper, and has a proprietary, treated moisture-resistant core. DensShield offers a proven tile backer design that is compliant with more stringent 2006 IRC and IBC codes.
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Q: Why should I apply thin-set mortar to the subfloor before putting down DensShield® tile backer?
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A: Many of our customers feel as long as they are using mechanical fasteners such as nails or screws to fasten DensShield tile backer to a sub-floor, that applying thin-set mortar is a superfluous step. This is not true. The application of thin-set over plywood eliminates any air gaps between the subfloor and the back of the DensShield panels. If this step is not completed, air gaps could cause movement and crack the grout lines or tile.
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Q: Can I use joint compounds produced by other gypsum companies on Georgia-Pacific gypsum board?
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A: Yes. Joint compounds produced by other companies can be used with good results on Georgia-Pacific gypsum board provided these compounds meet or exceed ASTM C 475 product standards. However, do not mix compounds produced by different companies. Use the same brand of compound for all coats. Otherwise, there may be a reaction between the proprietary ingredients of each brand.
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Q: I’m using one month old Ready-Mix joint compound. It’s trapping air bubbles. What should I do?
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A: The joint compound should be mixed thoroughly before each use. If the joint compound pail was not closed properly after the previous use, a small amount of water should be added prior to mixing. Always use clean mud pans, taping knives and other tools.
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Q: My dog ate joint compound. What should I do?
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A: While this may appear to be a funny question, it deserves a serious and professional answer. Even though our joint compound is non-toxic, take the pet to a veterinarian. You or the vet can call our Environmental Safety department at 404-652-5119 for information. Information about safety and first aid measures is also available in the Material Safety Data Sheet (PDF 135KB/7pgs) for All-purpose Ready-Mix joint compounds.
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Q: What are other uses of joint compound?
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A: In addition to finishing joints, joint compounds are used to skim coat or texture gypsum board surfaces. Water or latex based paint can be added to joint compound to texture the board surface. Refer to The Wallworks Guide (PDF:1.7MB/8pgs). Joint compounds also are used as an adhesive to laminate gypsum board to gypsum board or interior concrete masonry wall surfaces.
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Q: What is 90 compound and where is it used?
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A: There are two different types of joint compounds; drying and setting types. Drying type compounds are composed of limestone and binder. These compounds must dry out completely before the binder becomes effective. Setting compounds work well with fiberglass mesh tape. ToughRock® 90, the Georgia-Pacific Gypsum brand of setting compound, is recommended for skim coating DensShield® and DensGlass Gold® (see literature for application recommendations).
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Q: What should I do if Ready-Mix joint compound freezes?
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A: First, do not allow Ready-Mix joint compound to freeze. However, in the event that the compound does freeze, it should be allowed to thaw completely. Do not force the thawing cycle with heaters, heat guns, etc. Simply place the bucket in a warmer environment. Once thawed, it should be mixed thoroughly. Then try it out on a small area to test its working characteristics. Multiple freeze and thaw cycles will have a negative impact on workability and may cause the compound to form small lumps. In this case, it should be discarded.
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Q: Are there any advantages/disadvantages of synthetic vs. natural gypsum in performance, finishing, laminating, etc.?
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A: Gypsum board produced by G-P Gypsum using natural gypsum, synthetic gypsum or a blend of the two, meets or exceeds ASTM C 36 product standards. The physical properties, fire resistance, finishing and laminating characteristics of board using natural gypsum or synthetic gypsum are identical.
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Q: Can I use greenboard as sheathing?
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A: (The following answer is based on the opinion of the Gypsum Association’s Technical Services Group.) Yes, moisture-resistant board (greenboard), which is designed as an indoor tile backer board, can be used as sheathing. Gypsum sheathing has a moisture-resistant paper and a treated or non-treated gypsum core. Greenboard also has a moisture-resistant paper and a treated core. Greenboard has a tapered edge while sheathing is a square edge product. If you plan to attach vinyl or steel siding over the sheathing, there will be a dip at the taper; therefore, this application is not advisable. If the substrate is a stone or brick cavity wall, however, the application can work. We strongly suggest using building felt over this type of sheathing.
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Q: Can I use gypsum board in ceilings at 24" o.c. support?
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A: According to the Gypsum Association publications GA-216 and GA-201, gypsum board could be applied in a ceiling framed 24" o.c. provided the board length is at right angles to the framing members. The Gypsum Association also mentions that a water-based texture should not be applied to any board applied to framing 24" o.c. The excessive amount of water in the texture could cause the board to sag. We always advise our customers to use either 5/8" board or CD ceiling board in such applications. Once the board sags, it is much more expensive to replace than to use the right product initially. Sag in the ceilings of new homes is a common complaint. Most of the time, research reveals it is not the board but job site conditions that cause the board to sag. Propane heaters combined with poor ventilation cause build-up of moisture in the house. A non-insulated (poly sheet) vapor barrier in the plenum also could cause board sag. The water in the texture evaporates through the board and into the plenum. If the vapor barrier has not been insulated prior to texture painting, the water vapor condenses against this surface and drips back onto the board.
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Q: Do we need to use the 6" wide Type C battens over the H stud flanges in the area separation wall system?
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A: Older area separation wall designs required the web of H-stud flanges to be covered with 6" wide Type C gypsum board battens. The reason was very simple. In a fire test, the H-stud web exposed to the fire on one side would transmit the high temperature readily to the unexposed side and prematurely fail the test. The new design, which includes the wood frame wall as part of the assembly, simply requires that a 3/4" air space be left between the flange and the wood frame.
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Q: Does GP offer a one-hour shaftwall for corridor ceilings?
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A: Yes. The Series 622 one-hour shaftwall design can be used as a one-hour ceiling assembly. This one-hour rated assembly is a wall design and may not be acceptable as a one-hour rated corridor ceiling in some parts of the country. Ask your local building code official prior to construction. An alternative is to install the tested 2-hour horizontal shaftwall system series 623, 624, or 627, although only a one-hour fire rating is required. Series 622 uses a single layer of 5/8" ToughRock Fireguard® in addition to 1" ToughRock® shaftliner or DensGlass Gold Ultra Shaftliner, while the 2-hour design involves the use of three layers of 5/8" Type X or Type C product.
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Q: How do we convince a building inspector who insists on an Underwriter’s Laboratory (UL) test reference, that a GP system complies to code even though it has been fire tested at a different test agency?
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A: Either ignorance or unjust biases cause some building inspectors to insist only on UL test references. Many of our fire-rated designs were tested at UL. But there are several assemblies that have been tested at other reputable testing agencies such as Warnock Hersey International (WHI), Commercial Testing Company (CTC) and Factory Mutual Research Corp. (FM). The systematic approach for tackling this situation is to put the Gypsum Association’s Fire Resistance Design Manual to work. The manual is referenced by all major building code writing organizations. In other words, the information provided in the manual is code accepted. On page 4 of the 15th edition, the Gypsum Association lists approved fire testing laboratories. UL Inc. is one of these test agencies. Therefore, a WHI-tested assembly, as well as any other listed, is as good as those tested at UL. As most local codes are modeled after these major building codes, there is no valid reason for such an objection.
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Q: How much recycled material is used in ToughRock® gypsum board?
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| A: There are two major components of gypsum board - the paper skins and the board core. The recycled content question applies to both of these components. The paper is produced using 100% recycled fiber. The recycled content of the core varies from plant to plant. Sources of recycled gypsum are plant waste, new home construction site cutouts, chemical gypsum, and Flue Gas Desulfurization (FGD) gypsum. Georgia-Pacific Gypsum enforces very stringent quality control standards at all of its plants. Rejected bo |
