Washington State Labor and Industries signed off on the floor framing on Tuesday and then yesterday the floor sheathing. Within a few hours the Warmboard sub floor was down and ready to except the wall framing. If you are not yet familiar with Warmboard, you can check them out at warmboard.com. Basically, Warmboard doubles as the structural subfloor and application for the radiant tubing. The main thing is since there is no thermal mass, such as concrete involved, the floor heats up much faster with more efficiency. There is a thin layer of aircraft grade aluminum on top, with grooves built in for the radiant tubing, which your
finish floor sits directly on top of.