DEAR TIM: I am currently installing rigid foam insulation around the exterior of my foundation. I’m installing three inches of it to a depth of 10 to 13 inches below grade to keep the heat in ...

The other issue is insulation levels. Two inches of rigid foam has an R value of only about 10, which is not enough to code for new buildings. It works in cold climates, but there is unnecessary ...

Rigid Foam vs. Fiberglass Insulation: Major Differences Rigid Foam Insulation Rigid foam insulation consists of panels sold in 4-by-8-foot sheets in thicknesses from 1/4 to 2 inches.

What is insulation board? Insulation boards are rigid boards or sheets made of foamed polystyrene, polyurethane, polyisocyanurate, or gypsum. Their rigid, closed-cell structures provide better ...