How Many Inches Of Insulation In The Attic Equals R45

This calculator is to be used as an estimating tool only.

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. Click the button to calculate the approximate r value for this job. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Types of insulation insulation comes in many different forms some of which are listed below.

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. Input length width and desired r value of the area to be insulated. The report gives an r value of 5 7 for the 1 6 inch thick test sample. For loose fill cellulose this translates to a total depth ranging from 8 inches.

5 5 inches a nominal 6 inches is allowed in attics and crawlspaces. 12 inches thick 13 0 20 to 0 40 0 02 30 0 60 to 1 00 0 03. Achieving greater r values in attics 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.

Input depth of existing blown in insulation in inches. That is about 10 to 12 inches of blown insulation. This calculator is to be used as an estimating tool only. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

What to do for your home. Attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated. That is about 13 to 15 inches of blown 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.