Powerdeck F from Recticel Insulation is a closed cell, rigid PIR foam insulation board for use on warm flat roofs under built-up felt, mastic asphalt and approved single-ply membrane waterproof ...

With this unit as the standard to go by, open cell spray foam insulation costs between $0.45 and $0.65 per board foot. Closed-cell spray foam is more expensive, costing between $1 and $1.50 per ...

4. Foam Board Insulation Foam boards, also known as insulating boards or rigid foam panels, are firm structures used to reduce the amount of heat conducted through wood, wall studs and roofs ...

R-values are additive, so any insulation you add to the outside of your house will improve its overall R-value—and a single inch of foam insulation can increase the R-value of your home by 5.