What Insulation Under Concrete Floor

Insulating concrete garage floors begins with covering the entire floor with 6 mil polyethylene which will serve as a vapor barrier.

What insulation under concrete floor.

Step 1 excavate the area under the slab to 12 inches below the planned level of the top of the slab. Most modern homes have a solid floor for example. The first thing to consider when looking into different types of concrete floors is why it s so important to insulate the floor slab. There will be a damp proof membrane under the insulation and possibly a second membrane on top depending on the type of screed.

Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available. The insulation is then laid followed by a polythene separating layer and either a concrete screed or tongue and groove chipboard ready to receive the specified floor finish. R 15 scored squared edge rigid foam board insulation sheathing model 9gb view the owens corning basement and crawlspace insulation. Run the polyethylene up the sides of the walls 3 to 4 inches and secure to the walls with construction tape.

The reflectix concrete slab insulation is an innovative easy to handle product that increases the energy efficiency of radiant floor and snow melt systems under concrete. The foil within the product acts to spread out the heat signature of the heating coils. This allows an area for insulation and fill material under the slab. Adding insulation under the concrete floor requires the same skill set and equipment as forming and pouring the concrete slab.

Insulation is laid on the concrete and covered with a screed. Up to 80 of heat loss in a floor slab occurs around the edges. Insulating a solid floor.