Exterior Wall Insulation R Value

This material offers the highest r values about r 6 to 6 5.

Exterior wall insulation r value.

It provides about r 5 per inch. 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. Insulation rolls rolled insulation is another type of insulation blanket similar to batt insulation. See the department of energy s doe ranges for recommended levels of insulation below.

Insulation ratings are measured in r values per inch of thickness. Try the r value calculator available through oak ridge. 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. Thickness density and type of materials are some factors that contribute to r value.

The table below shows what levels of insulation are cost effective for different climates and. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat traveling through it.

Recommended home insulation r values. The higher the r value the better the thermal performance of the insulation. Higher r value numbers mean that the insulating material resists the cold or heat from the outside better. Some products have reinforced facing to make them sturdier.

Choose this option for areas that need a good amount of strength and water resistance. It provides r values that range from 3 6 to 4 2 per inch. Fiberglass batts for standard 2 4 walls are now available in low medium and high density products that range from r 11 to r 15. Exterior walls if your exterior walls are constructed from 2 by 4 inch studs the most insulation that can go into the wall while retaining its r value is r 13 or r 15 as these are both made to fit a cavity 3 1 2 inches deep.

While wall insulation is limited by the width of the studs different materials provide higher or lower r values. Standard fiberglass batts have r values ranging from r 2 9 to r 3 8 for every inch of thickness but high density insulation batts can have r values as high as r 4 3 per inch. Basics of faced fiberglass insulation from r 13 to r 19. Insulation r values vary based on the type thickness and density of the insulation material.

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. An r value tells you how well a type of insulation can keep heat from leaving or entering your home. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. R value is a standard unit of measurement for determining among many things how effective your insulation will be.