Insulated Floor Slab Construction

The compacted aggregate base is first followed by a 6 mil polyethylene vapor barrier then insulation then rebar or wire mesh or both.

Insulated floor slab construction.

Insulation requirements for slab on grade floors can be found in section r402 2 9 of the 2012 iecc and section n1102 2 9 of the 2012 irc. Up to 80 of heat loss in a floor slab occurs around the edges. There are many different soil conditions and corresponding slab designs. But when adding insulation to an existing slab the vapor barrier is laid over the top of the slab before the foam insulating panels are installed.

When a slab is being insulated in new construction the vapor barrier is usually laid down first before the slab is poured. Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation. Related slab on grade foundation pages. 4 where rainfall can be heavy use a fine tooth trowel to apply cold cut back asphalt mastic over the entire slab use about one gallon per 100 square feet of floor.

Depending on the use of the building the slab can then be finished ready for use or receive a screed suitable for a floor finish. 3 clean the surface of the slab thoroughly then apply a coating of asphalt primer to help the asphalt cement bond. Although building codes differ by region builders typically use r5 and r10 insulation under the concrete slab but floors insulated with r20 contain the heat in your basement far better than those insulated with lower r values. If the insulation is going below the slab the damp proof membrane dpm is laid next followed by the insulation a polythene separating layer and the concrete slab.

However even a newer slab insulated with r 20 may not be adequate depending on a few factors including the type of. The insulation phase is crucial for a radiant floor. Slab on grade foundation detail design. This page is about how to build a thickened edge concrete slab on grade fpsf footing on soil with a high water table to prevent frost heave by first installing drainage below the slab.

Follow label directions and allow it to dry thoroughly. Where insulation is positioned above the slab. Mainly heated slabs radiate outward rather than downward so insulation on the edges of the slab is most important.