For more information on compromised gypsum underlayments, please see USG Rehabilitation Guidelines for Damaged Gypsum Underlayments (CB822).
#Concrete skim coat Patch
USG Durock Advanced Skim Coat Floor Patch can be used over gypsum underlayments. Simple visual appearance of the concrete substrate as strong and solid does not necessarily guarantee that the concrete substrate is free of impurities and has a minimum tensile strength of 175 psi when tested per the ASTM C1583 standard.Ī weak or degraded concrete surface or concrete exhibiting signs of laitance (either visible or invisible), scaling, spalling, crumbling, or delamination must be mechanically removed to achieve a solid and clean substrate. 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 are. Mechanical floor preparation such as shot-blasting, scarification or other methods of grinding may not be required prior to installation of the floor patch over a well-bonded, sound, and clean subfloor. 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.
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. All subfloors must be structurally sound, stable, and solid.
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