Recommended Levels of Insulation

Wall Insulation: Whenever exterior siding is removed on an

Uninsulated wood-frame wall:

• Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding, and
• Zones 3–4: Add R5 insulative wall sheathing beneath the new siding
• Zones 5–8: Add R5 to R6 insulative wall sheathing beneath the new siding.

Insulated wood-frame wall:

• For Zones 4 to 8: Add R5 insulative sheathing before installing the new siding.