Attic Insulation R13 Vs R30

Attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated wood frame wall 1 r30 to r49 r25 to r30 r13 2 r30 to r60 r25 to r38 r13 to r19 n a 3 r30 to r60 r25 to r38 r19 to r25 and add r5 insulative wall sheathing beneath the new siding 4 r38 to r60 r38 r25 to r30.

Attic insulation r13 vs r30.

R13 is pretty common for wall use but if you have staggered studs or a 2x6 stud wall then r30 would probably be a good idea. I think r30 goes better between 2x6 s or larger. Improved insulation is a good step toward improving building efficiency particularly since the atlanta based american society of heating refrigerating and air conditioning engineers ashrae increased minimum roof insulation levels in 2007 in its standard 90 1 the first increase in 18 years and if that isn t enough to spur someone into action. Add insulation to attic.

A recent mckinsey co. R13 is pretty common for wall use but if you have staggered studs or a 2x6 stud wall then r30 would probably be a good idea. The key is to figure out how much it s going to cost you to get those savings. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

Installing additional insulation from r 30 to r 38 not so much. It might fit but it would have to be compressed so much that it would probably lose some of its r value. In attics we should use additional layers of. I think r30 goes better between 2x6 s or larger.

New homes with 2x6 walls will accommodate r19 or r21 insulation. Enter your data into the fields where indicated. An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer. It might fit but it would have to be compressed so much that it would probably lose some of its r value.

The material cost is minimal compared to the fixed costs of the contractor to do either or your time to pickup a blower and material. Building new hame same answer. Insulation savings calculator use this insulation savings calculator to measure the financial impact of increasing your insulation performance. The depth of the 2x4 is 3 5 inches which will accommodate r11 or r13 insulation.

Existing 3 4 inches of insulation. Going from r 11 to r 13 just involves using a different insulation but going from r 13 to r 15 the whole wall r value for 2x6 walls requires going from 2x4 to 2x6 walls and thus more insulation more lumber and doors and windows with wider jambs.