Sheathing Exterior Walls

House’s exterior including walls with plywood sheathing.

In This Article: Structural Sheathing Nonstructural Sheathing Most new walls need sheathing to strengthen them, to act as a nailing base for siding, and/or to boost insulation. Existing walls usually do not require sheathing unless you are stripping off the old siding and applying a different type that calls for sheathing. Be sure to check […]