The formular 400 (pink XPS) has a compression strength of 40 PSI. The footing will be insulated from ground contact and thermal bridging to the soil.
Tag Archives: rigid foam
Layering insulation under the footing
Dan Gregg, the foundation subcontractor, sets the the double layer of 2- inch thick foam sheets in an overlapping arrangement. This Formular 400 rigid foam insulation is XPS and will be used in limited amounts where the compressive strength is required.