Minimum Insulation For Walls
The map above shows each region of the u s.
Minimum insulation for walls. Add r5 insulative wall sheathing beneath the new siding. R values can be higher for foam insulation and other advanced insulation systems. 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. Minimum requirements r values identify insulation levels.
The r value your insulation needs depends on your local climate. Your climate zone indicates the recommended insulation levels for attics walls floors basements and crawl spaces. 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.
Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13. Residential requirements for insulation are divided by the location in the home. 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. 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.
See the department of energy s doe ranges for recommended levels of insulation below. And the department of energy s corresponding climate zone. Framed wall insulation must meet or exceed r 13.