How Many Inches Of Insulation In The Attic Equals R45

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

How many inches of insulation in the attic equals r45.

In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. As a benchmark one inch of solid wood has an r value of 1. Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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.

Attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated. 12 inches thick 13 0 20 to 0 40 0 02 30 0 60 to 1 00 0 03. That is about 13 to 15 inches of blown insulation. Click the button to calculate the approximate r value for this job.

That is about 10 to 12 inches of blown insulation. This calculator is to be used as an estimating tool only. For loose fill cellulose this translates to a total depth ranging from 8 inches. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

We don t see how an adequate r value can be provided in attics for our area. Input length width and desired r value of the area to be insulated. What to do for your home. 5 5 inches a nominal 6 inches is allowed in attics and crawlspaces.

Types of insulation insulation comes in many different forms some of which are listed below. The company claims that there is an alternate way to evaluate the insulation value provided by. In the far north the code minimum for new homes is as high as r 44. The report gives an r value of 5 7 for the 1 6 inch thick test sample.