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USG DUROCK™ BRAND

USG DUROCK™ BRAND
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USG Tile & Flooring Solutions SUBMITTAL SHEET USG DUROCK BRAND ADVANCED SKIM COAT ™ FLOOR PATCH Premium, versatile, trowelable calcium aluminate skim coat and floor patch • Ideal over concrete, gypsum, metal and wood subfloors and most interior floors, including tile • Fast setting—floor coverings may be installed in as little as 15 minutes • Innovative formulation offers significant yield advantage vs. competitive products • May be retempered multiple times prior to set without addition of water • No priming necessary over most surfaces • Featheredge to 1/2 in. (13 mm) thick in large areas; any thickness in small well-defined areas such as thresholds and concave-shaped depressions in substrates • Easy mixing and smooth finish over various substrates • May be used as an embossing leveler1 1. For maximum bond when embossing, use in conjunction with USG Durock™ Brand Matrix™ Bond Enhancer. USG Durock™ Brand Advanced Skim Coat™ Floor Patch is a versatile calcium aluminate floor patch and skim coat for interior use over wood, concrete and gypsum subfloors.1 Its versatility allows USG Durock™ Advanced Skim Coat Floor Patch to be used over most interior floors, including ceramic and quarry tile, terrazzo, wood, metal and interior concrete, as well as properly prepared residues of cutback and other non-water-soluble adhesives on concrete and epoxy coatings. Simply mix USG Durock™ Advanced Skim Coat Floor Patch with water and apply with a trowel—no need for priming or a latex additive for most applications. USG Durock™ Advanced Skim Coat™ Floor Patch can be used as an embossing leveler over most floor coverings including sheet goods, VCT and tile when mixed with water. To enhance bond to epoxy coatings or for high performance applications, use in conjunction with USG Durock™ Matrix™ Bond Enhancer. 1. See Notes/Limitations #20, pg. 6. EXTENDED WARRANTY SUBFLOOR PREPARATION USG Durock™ Advanced Skim Coat Floor Patch achieved GREENGUARD Gold Certification and qualifies as a “Low Emitting” material per California Department of Public Health CDPH/EHLB/Standard Method (CA Section 01350) for school classroom and private office modeling scenarios, and contributes towards USGBC’s LEED® v4 emission requirements. An extended warranty may apply when using USG Durock™ Advanced Skim Coat Floor Patch in a system application. Please contact USG for further details. All subfloors must be structurally sound, stable and solid. If there is any question about the structural soundness of the subfloor, consult with the engineer on the project or request the services of a professional structural engineer. Subfloors must be clean and free of dirt, tar, wax, oil, grease, latex compounds, sealers, curing compounds, release agents, asphalt, water-soluble adhesives, paint, chemicals, loose old cementitious products, joint compounds from drywall installation or any other contaminant that might prevent proper bonding of USG Durock™ Advanced Skim Coat Floor Patch to the host substrate. CONCRETE SUBFLOORS Mechanical floor preparation such as shot-blasting, scarification or other methods of grinding may not be required prior to installation of the underlayment over a well-bonded, sound and clean subfloor. To decide whether mechanical preparation of substrate is required or not, the concrete substrate must be thoroughly assessed for its quality over the entire pour area. Simple visual appearance of the concrete substrate as strong and solid does not necessarily guarantee that the concrete substrate is

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SUBFLOOR PREPARATION CONT. CONCRETE SUBFLOORS CONT. Concrete exhibiting signs of laitance (a layer of weak material on the concrete surface either visible or invisible), scaling, spalling, crumbling or delamination must be mechanically removed to achieve a solid and clean substrate. Prior to installation of the underlayment, remove weak or degraded concrete (as described above) with hammer, chisel or other simple means. It is not required to mechanically profile the concrete subfloor with methods such as shot blasting, scarifying or diamond grinding. Concrete subfloors receiving USG Durock™...

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SUBFLOOR PREPARATION CONT. GYPSUM UNDERLAYMENTS METAL SUBFLOORS USG Durock™ Advanced Skim Coat Floor Patch can be used over gypsum underlayments. For more information on compromised gypsum underlayments, please see USG Rehabilitation Guidelines for Damaged Gypsum Underlayments (CB822). Existing gypsum underlayments must be solid with no cracks and be dust free. Underlayment must be sealed with USG Durock™ Brand Primer-Sealer or USG Durock™ Fusion™ Primer. First test surface hardness by scratching existing underlayment with a coin. If surface can be gouged, do not use USG Durock™ Advanced...

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MIXING TOOLS • Mixing bucket • Trowels • Razor scraper • Mixing drill type 2 through 7—as outlined in the Technical Guidelines prepared by the International Concrete Repair Institute, Pictorial Atlas of Concrete Repair Material Mixing Equipment (Guideline No. 320.5R-2014). • Mixing paddle type 2, 3, 4, 8 or 9—as outlined in the Technical Guidelines prepared by the International Concrete Repair Institute, Pictorial Atlas of Concrete Repair Material Mixing Equipment (Guideline No. 320.5R-2014). Three parts USG Durock™ Advanced Skim Coat Floor Patch to one part water by volume, or up to 2.25...

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FLOOR-COVERING INSTALLATION • USG Durock™ Advanced Skim Coat may be ready for floor covering in as little as 15 minutes after application (at 70°F (21°C). Drying time is dependent on job site temperature and humidity conditions as well as application thickness. For example, high humidity and/or low substrate temperatures will extend dry times. • Floor coverings such as ceramic tile, VCT, sheet vinyl and carpeting can be installed as soon as USG Durock™ Advanced Skim Coat Floor Patch can be worked on without damaging the surface. • Nonbreathable floor coverings requiring special adhesives...

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