Once you find your home s zone on this map you can use the below insulation r value chart to determine the minimum r value your insulation should have.
Minimum insulation for walls.
Residential requirements for insulation are divided by the location in the home.
Minimum requirements r values identify insulation levels.
Wall insulation whenever exterior siding is removed on an.
For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6.
Cavity fibrous or cellulose insulation can be installed at levels up to r 15 in a 2 inch x 4 inch wall and up to r 21 in a 2 inch x 6 inch wall.
Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and.
The map above shows each region of the u s.
Your climate zone indicates the recommended insulation levels for attics walls floors basements and crawl spaces.
Framed wall insulation must meet or exceed r 13.
Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13.
Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.
Add r5 to r6 insulative wall sheathing beneath the new.
See the department of energy s doe ranges for recommended levels of insulation below.
R values can be higher for foam insulation and other advanced insulation systems.
And the department of energy s corresponding climate zone.