What are acceptable levels of relative humidity?

The type of flooring product to be installed determines the acceptable level of relative humidity (RH). Different RH specifications apply to different materials such as resilient flooring, wood, or epoxy coatings. Check with the floor covering manufacturer for a RH specification. Nearly all flooring manufacturers and industry associations recognize and specify RH testing. ASTM F710 gives general industry guidelines. Typical RH requirements range from 75% to 90% RH, depending on the flooring product. For a list of manufacturers’ RH specifications, please visit www.rhspec.com.