Foam sheathing isn't used much in home remodeling, though it should be.
As of only a few years ago, wood-only sheathing was installed on 3/4 of all new homes. For remodels, that number was far less.
Foam sheathing ranges from:
- The Low: Thin sheathing that installs directly onto existing wood sheathing. Its R-value is negligible, but it is effective at blocking air and water infiltration. All the way up to...
- The High: Thick, one-inch structural sheathing that installs directly onto the studs (no wood sheathing needed) and with an R-value of 5. That's the sheathing you see in the picture above, Styrofoam brand from Dow Chemical.
Image: (c) Dow