Minimum R Value For Attic

R value roofs without attic space insulation above deck u 0 032 r 30 0 ci u 0 028 r 35 0 ci with attic space and other u 0 021 r 50 0 u 0 017 r 60 0 walls above grade above grade walls u 0 055 r 13 0 r 10 0 ci u 0 055 r 13 0 r 10 0 ci wall below grade.

Minimum r value for attic.

In zone 6 the average minimum requirement for attic insulation is 14 inches of r49 fill. The higher the r value the better the thermal performance of the insulation. 2015 code requires walls to be insulated with a minimum of r 20 or r 13 5 13 5 means r 13 cavity insulation plus r 5 insulated sheathing. If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs.

R value is a measure of insulation s ability to resist heat traveling through it. 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. Department of energy recommended r values for add insulation to attic zone 4 uninsulated attic attic insulation run between r 49 to r 60. The average recommended level is 17 inches of r60.

Insulation level are specified by r value. If your home is in a warmer climate you require an r 38 or higher or about 12 more. The average recommended level is 17 inches of r60. Walls should be between r 19 to r 21 basement walls r13 to r 19.

In zone 5 the average minimum requirement for attic insulation is 11 inches of r38 fill. See the department of energy s doe ranges for. Knowing where you stand with the recommended r value for attic insulation will ensure that you receive the right insulation for your home. For homes that are situated in cold climates homeowners need to ensure that they have a minimum of r 49 in their attics this is equivalent to about 16 inches of fibreglass insulation.

Existing attic 3 4 inches of insulation r 38. Currently the recommended r value for attic insulation is between 6 1 and 7 a combination of thickness and conductivity. Homes should have between r 22 and r 49 insulation in the attic. If structural sheathing covers 40 or less of the exterior continuous insulation r value shall be permitted to be reduced by no more than r 3 in the locations where structural sheathing is used to maintain a consistent total sheathing thickness.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter.