Standard Depth Of Blown In Fiberglass Insulation Attic

When blown into attics and wall spaces loose fill fiberglass offers an average r 2 5 thermal value per inch the higher the number the greater the insulating effect.

Standard depth of blown in fiberglass insulation attic.

Input depth of existing blown in insulation in inches. This calculator is to be used as an estimating tool only. To arrive at r 38 you need at least 15 2 inches of blown in fiberglass insulation requiring you to add 3 2 more inches of insulation if you already have 12. Each bag of fiberglass insulation will cover approximately 65 square feet of attic space to a depth of 10 inches cellulose insulation covers half as much.

A poorly insulated attic lets heat escape through the roof wasting energy used to warm. Fibreglass insulation material has no nutritional value for insects and less likely to get attacked by them. Inspecting your attic insulation. Cellulose attic insulation read more.

For loose fill cellulose this translates to a total depth ranging from 8 inches. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Ten inches of blown insulation provides an insulating value of approximately r 30 1 inch of fiberglass provides about r 2 7 while 1 inch of cellulose is approximately r 3. You d need a thickness of.

How deep to put blown in insulation. Click the button to calculate the approximate r value for this job. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. To ensure an even distribution i cut a dozen dowel rods to match that depth and then spray painted their top halves a bright orange color.

Attic insulation is a key to saving energy during the heating season. I wanted an r value between 49 and 60 in my attic so i settled upon a desired depth of twenty inches of insulation. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.