Minimum Wall Insulation R Value

A 3 5 inch deep fiberglass rockwool or recycled denim batt for a typical 2 4 wall may say it provides r 11 or r 13 depending on fiber density.

Minimum wall insulation r value.

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. 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. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Basement walls require a minimum of either r 10 continuous or r 13 batted insulation.

Insulation level are specified by r value. See the department of energy s doe ranges for recommended levels of insulation below. The higher the r value the greater the insulation performance. First let s discuss r value in a practical real world way.

Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. 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. Know exactly how much you need with our project calculators.

When you look at a roll of batt insulation it is often marketed by it s total r value. Specific insulation requirements of section c402 2 thermal requirements of either. R value measures how well certain building insulation materials can resist heat. R value is a measure of insulation s ability to resist heat traveling through it.

While wall insulation is limited by the width of the studs different. Recommended home insulation r values. 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. For 6 inches r 15 or r 19 etc.