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.

Loose fill fiberglass seems to dominate attic insulation in new construction homes and has an r value of approximately 2 5 per inch. Recycled glass or sand that s melted and spun into fibers. Recommended home insulation r values. R value measures how well certain building insulation materials can resist heat.

Spray foam pink fiberglas vs. Pros and cons of loose fill fiberglass attic insulation. The further north northeast you go the colder it is and the more necessary r value will grow. 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.

Like cellulose you need a big machine to blow it in. The higher the r value the better the thermal performance of the insulation. As a benchmark one inch of solid wood has an r value of 1. However this value varies not only on the basis of the type of insulating material but also on the area.

When determining how much insulation you need don t guesstimate calculate. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. Warmer climates only require an r 38 or higher or about 12 or more.

Know exactly how much you need with our project calculators. 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. 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. In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60.

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

The table below shows what levels of insulation are cost effective for different climates and. 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.