Exterior Wall And Roof Insulation R Value

Foam board or insulating boards are rigid panels of insulation that have a high r value.

Exterior wall and roof insulation r value.

The higher the r value the better the thermal performance of the insulation. 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. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. Note from this.

R value is a measure of insulation s ability to resist heat traveling through it. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Best for floors foundation and basement walls interior and exterior wall sheathing and low sloped ceilings. Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage.

R value of various materials. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. For a very good introductory overview article on r value see r values over at the website of. Insulation level are specified by r value.

Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. 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. Some installations can yield a higher r value than traditional batt insulation for the same thickness and can fill even the smallest cavities creating an effective air barrier.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. The r refers to absolute thermal resistance. R value is a standard unit of measurement for determining among many things how effective your insulation will be. You can use the small pressurized cans of foam.

Basics of faced fiberglass insulation from r 13 to r 19. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. Because they have a high r value and can be used nearly anywhere in your home foam board insulation is one of the most common types of insulation. The table below shows what levels of insulation are cost effective for different climates and.