Insulated Floor Slab Construction

The insulation phase is crucial for a radiant floor.

Insulated floor slab construction.

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. Related slab on grade foundation pages. 3 clean the surface of the slab thoroughly then apply a coating of asphalt primer to help the asphalt cement bond. Up to 80 of heat loss in a floor slab occurs around the edges.

Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation. There are many different soil conditions and corresponding slab designs. Slab on grade foundation detail design. Mainly heated slabs radiate outward rather than downward so insulation on the edges of the slab is most important.

Follow label directions and allow it to dry thoroughly. 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. However even a newer slab insulated with r 20 may not be adequate depending on a few factors including the type of. The first thing to consider when looking into different types of concrete floors is why it s so important to insulate the floor slab.

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. When a slab is being insulated in new construction the vapor barrier is usually laid down first before the slab is poured. Check out this article for a list of slab edge insulation solutions and episode 125 for my interview with henry edney of maxraft. 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.

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. Where insulation is positioned above the slab. 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.