Rigid Foam Has A Range Of R-Values Rigid foam, or foam board insulation, is another popular option for the garage. The sheets' thickness varies between 1/2 inch to 4 inches thick, which gives the ...

Basement walls follow the same strategy, since a basement’s concrete wall represents a continuously cold element. Glue continuous rigid insulation directly over the concrete, then frame a 2×4 wall, ...

Rigid foam sheeting has an R-value ranging from R-5 to R-10 per inch of thickness ... from R-23 to R-31 with only 5-1/2 ...