Attic Batt Insulation R Value

Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.

Attic batt insulation 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 a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall. Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. Pros and cons of loose fill fiberglass attic insulation.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Loose fill fiberglass seems to dominate attic insulation in new construction homes and has an r value of approximately 2 5 per inch. Know exactly how much you need with our project calculators. As a benchmark one inch of solid wood has an r value of 1.

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. The higher the r value the greater the insulation performance. R value is a measure of insulation s ability to resist heat traveling through it. You can use the small pressurized cans of foam.

Recycled glass or sand that s melted and spun into fibers. R value measures how well certain building insulation materials can resist heat. Insulation level are specified by r value. Like cellulose you need a big machine to blow it in.

However this value varies not only on the basis of the type of insulating material but also on the area. Recommended home insulation r values. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Spray foam pink fiberglas vs.

Warmer climates only require an r 38 or higher or about 12 or more. 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. The table below shows what levels of insulation are cost effective for different climates and. When determining how much insulation you need don t guesstimate calculate.

The further north northeast you go the colder it is and the more necessary r value will grow. The higher the r value the better the thermal performance of the insulation.