Under Concrete Insulation Board

Lack of foundation insulation on below grade and under slab projects can account for up to 25 of a structure s total heat loss.

Under concrete insulation board.

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. Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available. Finally some contractors in cold climates began installing a continuous horizontal layer of rigid foam insulation under their concrete slabs. R 15 scored squared edge rigid foam board insulation sheathing model 9gb view the owens corning basement and crawlspace insulation.

Continuous insulation is defined in 90 1 as insulation that is continuous across all structural members without thermal bridges other than fasteners and service openings. Attach the tongue and groove insulation boards to the concrete wall with adhesive. Concrete contractors learned that a layer of poly helps to keep a slab dry because it stops upward vapor diffusion from the soil. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

Applying a bead of polystyrene compatible caulk or mastic to the top of the insulation board minimizes water infiltration behind it. For under slab applications the rigid foam insulation typically should be installed over a gravel base with a poly vapor diffusion retarder between the gravel and insulation. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications. Some types of thicker foam board insulation are available but they may need to be special ordered.

For installation on concrete foundations and under floor slabs the rigid foam insulation you choose can make a difference of tens of thousands of dollars on a project. Use a premade kit for this type of project. It is installed on the interior exterior or is. A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs.

Foamular foamular 250 3 in. Eventually polyethylene was invented. Foam board insulation is easy to use and is a great diy way to add some insulation.