Under Deck Radiant tubing can be installed under an existing floor with staples, by drilling holes across the floor joists, or by just about any means the installer can design to place the tubing as close to the bottom of the sub floor as possible. Foil faced fiberglass insulation should be positioned with a 2" air gap between the foil and the bottom of the sub floor. On Top of Insulated Deck The insulation under the deck must have a 2" air space between the top of the insulation and the bottom of the sub floor. Wood spacers the same thickness of the tubing should support the floor over the tubing; the radiant works best if it is touching the bottom of the floor that is over it. On Top Of Uninsulated Deck If the existing floor is not insulated and no access exists to do so, sleepers must be placed on top of the floor to create a gap deep enough to place rigid insulation between them that will carry the radiant tubing on top in such a fashion that it will touch the underside of the upper floor.
Masonry Filler When tubing is installed between sleepers, a masonry filler will increase the thermal mass of the floor as well as act as a sound dampener. Do not fill the space around the tubing with products such as vermiculite or perlite, or any Styrofoam filler that can act as an insulator. |
