USG Fiberock® Underlayment and Tile Backerboard Installation Guide
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TM TM Underlayment and Tile Backerboard Installation Guide Interior Floors, Walls and Countertops USG Fiberock® Brand Underlayment and Tile Backerboard USG Fiberock® Brand underlayment and tile backerboard are all purpose substrates engineered to meet floor underlayment and wall tile-backing needs throughout a home. Under resilient flooring, USG Fiberock underlayment provides a hard surface that’s smooth and flat with no bumps or ridges to show through or affect finished floor covering. Behind and under tile or natural stone, USG Fiberock tile backerboard provides the resistance to water and mold that is required in bathrooms, kitchens and entryways. With USG Fiberock panels, you can rely on a single family of products to back all types of tile and resilient flooring in the home. Integral Water Resistance Proven Performance This remarkable family of USG Fiberock panels are products is completely warranted for 20 years. different from other They have been tested by substrates. Manufactured the Tile Council of North with a unique, proprietary America (TCNA), using the technology, USG Fiberock Robinson Floor Method, and panels feature a durable, are approved for residential water-resistant composition and light commercial use (as that eliminates the defined by TCNA). swelling and warping often experienced with fiber Environmentally Friendly cement, plywood, oriented USG Fiberock panels are made strand board (OSB), lauan from 95 percent recycled and other wood-based material. In recognition of the underlayments. environmentally sound alternative these panels Easy to Install provide, United States Gypsum USG Fiberock panels score Company earned the Green easily and snap with minimal Cross certificate from Scientific effort. In fact, the International Certification Systems, a leading CertifiedFloorcovering testing company that evaluates Installer Association awarded environmental claims. USG Fiberock underlayment the “Installer Friendly Seal.” 2 Introduction Installing USG Fiberock panels tape and setting-type joint is quick and easy. Just follow compound. the simple installation steps in – Fasteners this booklet to create a perfect Wall Application: For steel base for tile or floor coverings. stud applications (20 ga. or equivalent), use 1-1/4" NOTE: Do not use USG or 1-5/8" USG Durock™ Fiberock panels over concrete screws for steel framing subfloors or over cushion- (or equivalent). For wood backed vinyl. stud applications, use 1/4", 1-5/8" or 2-1/4" USG Durock Tools screws for wood framing Common tools like those (or equivalent) or 1-1/2" shown below are typically hot-dipped galvanized ring all that are needed to install shank roofing nails. USG Fiberock panels, though Floor Application: Use additional, specialized tools 1-1/4" USG Durock™ tile may be required with some backer screws for wood finish materials, such as tile framing (or equivalent) and natural stone. or 1-1/2" hot-dipped galvanized ring shank roofing nails. For resilient flooring, use minimum 1/4" crown chisel point staples, hot-dipped galvanized ring shank nails or corrosion- resistant screws. Fastener length should be approximately equal to combined thickness of underlayment and subfloor. Materials Fasteners should not USG Fiberock Panels penetrate through subfloor. Size (thick x width x length) Units (pcs.) 1/4" X 4' X 4' 60 – Floor and Wall Framing 1/4" X 3' X 5' 60 Floor Tile Applications: 3/8" X 4' X 4' 60 Maximum joist spacing 3/8" X 4' X 8' 40 24" o.c. The subfloor system 3/8" X 3' X 5' 60 should be designed with a 1/2" X 3' X 5' 50 1/2" X 4' X 8' 30 minimum deflection limit 5/8" X 3' X 5' 40 of L/360 for the span. Some 5/8" x 4' x 8' 24 finish materials may require a more rigid subassembly – Sizes and Packaging (such as large format tile – Joint Reinforcement and natural stone products Behind ceramic tile, use L/720). In these cases, ™ USG Durock Brand tile follow the manufacturer’s backer tape and latex- minimum requirements. based Type I mastic or The subfloor should be latex-modified thin-set APA Span-Rated Plywood mortar. For sections that or OSB with an Exposure 1 will be painted, use paper classification or better with 3 Handling tongue and groove or back – Protect panels from the blocked at the unsupported elements with adequate edges. covering during delivery and storage. Wall Applications: – Store panels flat on an even, Maximum stud spacing: dry surface. Allow panels to 16" o.c. for tile installation. acclimate to temperature 24" o.c. for non-tile and humidity at job site installations. Framing shall prior to installation. be designed (based on stud – Handle panels in an properties alone) not to upright position to prevent exceed L/360 deflection for breakage. tile, L/240 for surfaces that will be painted. Maximum Incorrect fastener spacing: 8" o.c. for wood and steel framing; 6" o.c. for ceiling applications. – Patching Compound Use a high-quality patching compound such as USG Durock™ Fast Finish Floor Patch or equivalent Correct approved by the resilient- flooring manufacturer. – Adhesive/Mortar Meeting ANSI A136.1: Type I ceramic tile adhesive. Meeting ANSI A118.1: dry-set mortar. Meeting ANSI A118.4: latex portland cement mortar. Incorrect – Grout meeting ANSI A118.7. – Ceramic tile meeting ANSI A137.1. – Waterproof Membrane If waterproofing is desired, use USG Durock™ tile membrane installed with USG Durock™ tile membrane adhesive. See USG literature piece CB492 for USG Durock™ tile membrane product information. 4 Preparation Crawl-Space Requirements Ensure that subfloor and Crawl-space requirements structure are within tolerances may vary based on specified by floor covering geographic location. Consult manufacturer. Inspect subfloor local building codes for more for even, flat surface before specific information regarding installing underlayment. vapor barriers and their uses. Uneven end edge joints and variations in subfloor panel Subfloor Requirements thickness may telegraph The subfloor system should be through underlayment in vinyl designed for a deflection limit applications. Sand uneven of L/360 for the span. The joints, if necessary. subfloor should be APA Span- Ensure that subfloor is flat Rated Plywood or OSB with between framing elements. an Exposure 1 classification If subfloor panels appear to or better with tongue and buckle, correct by adding groove or back-blocked at the blocking or cleats under floor. unsupported edges. Fasten cleats to subfloor to flatten panels. Repair voids, Resilient Flooring large gaps and penetrations Joist Minimum through subfloor using a Spacing Subfloor manufacturer-approved floor Thickness leveler prior to installing USG 16", 19.2" 23/32" Fiberock underlayment. and 24" o.c. Over Existing Vinyl Floor Ceramic Tile CAUTION: Do not install USG Joist Minimum Spacing Subfloor Fiberock underlayment over Thickness heavily cushioned, thick foam- 16" o.c. 19/32" backed floor coverings. 19.2" o.c. 23/32" 24" o.c. 23/32" – Ensure that existing floor is level and meets appropriate Wood Subfloor design requirements. – Repair any missing or flush with or slightly broken vinyl tiles, curling below surface sand uneven seams, severe gouges, or joints protrusions by filling with fill and floor leveler. sand gaps If floor will be finished with ceramic tile, make sure that the existing vinyl covering is fully adhered and bonded to Clean subfloor and leave free the floor. of dust, dirt and debris. Ensure that subfloor is completely dry (no more than 12% moisture in subfloor prior to install). Verify that fasteners are flush with, or slightly below, subfloor surface. 5 Cutting and Laying Out Panels Cutting Panels For more cutting techniques, Maintain temperature and consult your USG sales humidity in space approximate representative. to that of normal occupancy prior to, during and after Panel Layout installation. Install Lay cut edges against the underlayment, with fastener wall— only factory edges marks up. Panels may be cut should be joined. Begin laying by scoring and snapping with panels at one corner. Maintain a utility knife and straight 1/4" space between panels and edge, or by sawing, working perimeter walls. Stagger joints from the face side. With score- a minimum of 16" so that four and-snap method, score panel panel corners never meet, and twice and snap away from cut offset end and edge joints of face, then snap panel in panels a minimum of 12"–16" reverse direction to break the from subfloor panel joints. Butt back. Where necessary, use a panel edges and ends lightly rasp or surform to smooth the together. =A maximum 1/32" cut edges. gap is allowed. Preparation for resilient flooring: Consider critical lighting when determining panel layout. Run continuous panel joints in the direction of the dominant source of natural light, when possible. 1/4" gap factory edges Cutouts For difficult cuts, combine cut edge underlayment the score-and-snap method 16" 16" with use of a handsaw or low- RPM power saw. Cut holes for plumbing with a hole saw, subfloor keyhole saw or variable-speed jigsaw. A power saw should be Prior to installation of final used only if equipped with a floor covering, avoid heavy dust-collection device. Always traffic and moving heavy items wear an OSHA-approved across panels. If necessary, dust mask when cutting USG items such as refrigerators or Fiberock panels with a power other appliances with wheels saw. (or on wheeled dollies) may be rolled over underlayment surface; using strips of hard wood or scrap underlayment to bear the wheel traffic is recommended. Allow a minimum of 24 hours after floor covering installation before placing heavy appliances or furniture on floor. 6 Floor Application Ceramic Tile Finishing Joints Underlayment or Tile Backerboard Panel Application Apply Type 1 organic adhesive with 5/32" v-notched trowel, latex-fortified mortar with 1/4" square-notched trowel.