Attic Batt Insulation R Value

Insulation level are specified by r value.

Attic batt insulation r value.

Warmer climates only require an r 38 or higher or about 12 or more. Pros and cons of loose fill fiberglass attic insulation. Insulation project calculator how to install naima r value certification product training videos colab learning video library for pros distributor locator why owens corning insulation propink vs. R value is a measure of insulation s ability to resist heat traveling through it.

Loose fill fiberglass seems to dominate attic insulation in new construction homes and has an r value of approximately 2 5 per inch. As a benchmark one inch of solid wood has an r value of 1. The higher the r value the greater the insulation performance. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

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. The table below shows what levels of insulation are cost effective for different climates and. Recommended home insulation r values. In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60.

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 better the thermal performance of the insulation. Spray foam pink fiberglas vs. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need.

However this value varies not only on the basis of the type of insulating material but also on the area. 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. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. 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.

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. Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. 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.

Know exactly how much you need with our project calculators. Recycled glass or sand that s melted and spun into fibers.