Insulating under foundation and basement slabs using spf spray polyurethane foam offers certain advantages over the more common method of using rigid foam board.
Spray foam under slab on grade.
Confirm long term thermal performance.
The first step is to drill holes in the problem concrete.
Although both are closed cell insulations they perform very differently over the long term.
Owens corning enclosure solutions.
Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.
Two common rigid foam insulations specified for below grade applications are expanded polystyrene eps and extruded polystyrene xps.
Geolift works for driveways sidewalks patios garage floors even pool decks.
An easy way to recognize eps on the jobsite is that it is commonly white.
Geolift works in three steps.
It also discusses installation procedures for below grade and under slab insulation.
The best way to insulate under a slab on grade concrete foundation is with eps rigid foam insulation.
See our step by step slab on grade construction videos in the ecohome green home building guide pages.
Holes should be no less than six inches away from the edge of the concrete.
As with any new technique however there are some considerations to take into account before using this approach for the first time.