The thin layer of concrete also helps to soundproof the floor. When adding radiant heating to an existing house, it is wise to use one of the installation kits for simplicity. Some kits include subflooring panels with grooves for the tubing and an aluminum covering. The grooves provide perfect spacing and the aluminum helps distribute the heat evenly. Other super-efficient kits include a multipart system.
Reflective foil is laid over the subflooring.
Next, interlocking flexible blocks are placed on the foil. The tubing, with thermal plates, snaps in place. Finally it is covered with a bio-coverstone sheet for protection and thermal mass. Update Bulletin No. 581 - buyer's guide of 15 radiant floor kit and system manufacturers listing tubing types, sizes, zoning, comfort and design features and typical installation methods.