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RH-100™┃Moisture Vapor Reducer


USG Durock™

RH-100™ is a 100% solids epoxy coating specially formulated for interior use over concrete with high moisture and/or pH levels.


USG Durock™ RH-100 Moisture Vapor Reducer manages moisture levels up to 100% RH and prevents alkalinity up to 14 pH in concrete subfloors from negatively affecting underlayments, floor-covering adhesives and floor coverings.

Low in viscosity, USG Durock™ RH-100 Moisture Vapor Reducer has excellent substrate wetting capabilities to promote penetration and adhesion. Moisture-tolerant, USG Durock™ RH-100 Moisture Vapor Reducer may be installed over a damp concrete subfloor (no standing or glistening water allowed) 5 days after subfloor installation.

USG Durock™ RH-100 Moisture Vapor Reducer exceeds the performance requirements in ASTM F3010, Standard Practice for Two-Component Resin Based Membrane-Forming Moisture Mitigation Systems for Use Under Resilient Floor Coverings.

Epoxy moisture mitigation system
  • For use over concrete subfloors with up to 100% RH and pH up to 14
  • Perm rating (ASTM E96): <.05
  • Exceeds the performance requirements in ASTM F3010
  • Low viscosity promotes superior penetration and adhesion
  • 100% solids epoxy mitigation system with zero VOCs
  • Fast cure in as little as 4 hours, depending on conditions
  • Empty packaging can be recycled
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Documents for this product may be available by request.
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