Foam boards are highly effective for insulating exterior walls, basement walls, attic hatches, and other parts of your home.
Mold on insulation often appears as black, brown, or greenish discoloration and is accompanied by a musty, dank odor.
Attic insulation levels are measured by R-Value, which indicates resistance to heat flow. Most attics should be insulated to R-38, or about 10 to 14 inches, depending on the insulation type.