Bona R540 is a one-component, roll-on membrane specially designed to control vapor transmission on absorbant and non-absorbant subfloors like plywood and Gypsum. It is compatible with all Bona systems including Bona R851, R850T and R859, and R880 wood floor adhesives.
Substitutes easily for felt paper over plywood subfloors for up to 20% MC.
Rolls on for fast and easy application.
Especially useful when used as a primer on sealed plywood subfloor systems such as AdvanTech® flooring. Also can be used for damp proofing concrete floors and substrates up to 18 lbs or 95% relative humidity.
Works well with under-floor heating systems. Helps prevent cupping!