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# How many square feet of sidewall does a bag of cellulose insulation cover?

Updated: 9/19/2023

Wiki User

13y ago

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Since there is no standard bag of cellulose insulation you will have to calculate the coverage of the specific product to be installed. Bags usually range in size from 18 pounds to 40 pounds. Cellulose must be installed at a minimum of 3 pcf in walls. A typical cavity in a house with nom 2 x 4 framing is a little less than 3 cubic feet. Thus, you need about 9 pounds of insulation per cavity. From this you can easily calculate the minimum amount of material needed to insulate a wall.

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