Spray Foam Under Slab On Grade

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Spray foam under slab on grade.

Although both are closed cell insulations they perform very differently over the long term. As with any new technique however there are some considerations to take into account before using this approach for the first time. Two common rigid foam insulations specified for below grade applications are expanded polystyrene eps and extruded polystyrene xps. An easy way to recognize eps on the jobsite is that it is commonly white.

It also discusses installation procedures for below grade and under slab insulation. Two of the rigid foam insulations most commonly used below grade and under slabs are expanded polystyrene eps and extruded polystyrene xps. Below grade under slab system with foamular rigid board insulation. The best way to insulate under a slab on grade concrete foundation is with eps rigid foam insulation.

Holes should be no less than six inches away from the edge of the concrete. Confirm long term thermal performance. Insulating under foundation and basement slabs using spf spray polyurethane foam offers certain advantages over the more common method of using rigid foam board. The first step is to drill holes in the problem concrete.

See our step by step slab on grade construction videos in the ecohome green home building guide pages. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.