SVS is an underlayment in a class by itself. It has been tested under various conditions for its permeability and effectiveness for protecting hardwood floors from subfloor moisture. It has been recognized and given accolades by various hardwood industry associations including the NWFA and the Radiant Heat Association.
Radiant Panel Association lab tests have confirmed that SVS is suitable for use on radiant heated floors. They found that there was “no measurable resistance to heat transfer with the product. No odors were released from Silicone Vapor Shield when heated from 90F to 100F.”