Rigid foam sheeting has an R-value ... R-value ranging from R-23 to R-31 with only 5-1/2 inches of combined fiberglass and foam insulation. To effectively ventilate your roof, create a 1-inch ...

Foam insulation panels are available in 1-, 1-1/2- and 2-in. thicknesses ... They attach to concrete, stone or block walls with rigid foam adhesive and can be cut with a utility knife or a ...