Helpful? 0

How to calculate how much cellulose for a dense-packed wall?

For the life of me I can't figure out how to calculate how much blown in cellulose we will need for the walls. 2X6 2ft on center with 8 ft ceilings. Applying Insulweb and dense packing.
I hear 3.5lbs per cubic feet
If I just knew how much one cavity would take I could get it figured.
How do is this calculated?

Asked by Gabriel Gonzales
Posted Sat, 10/19/2013 - 21:16
Edited Sun, 10/20/2013 - 07:06

Tags:

1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.
Helpful? 0

Gabriel,
To calculate volume, you multiply width by depth by height.
A typical 2x6 stud cavity might measure 14.5 inches by 5.5 inches by 92 inches.
Multiply the three numbers together, and you get 7,337 cubic inches.
Since 1,728 cubic inches equals 1 cubic foot, we divide by 1,728 to get cubic feet, so:
7,337 cubic inches = 4.2 cubic feet
So, to fill a stud cavity of this size, you'll need 4.2 cubic feet of cellulose. If you are installing the cellulose at a density of 3.5 pounds per cubic feet, you multiply the number of cubic feet by 3.5 to determine how many pounds of cellulose you need.
That means that you need 14.7 pounds of cellulose to fill a cavity measuring 4.2 cubic feet.

Answered by Martin Holladay, GBA Advisor
Posted Sun, 10/20/2013 - 05:13

Other Questions in General questions

U value of double windows for sound proofing?

In Green building techniques | Asked by Ryan Griffin | Nov 26, 14

Brands of HRV?

In Mechanicals | Asked by stephen sheehy | Nov 17, 14

Any good thoughts on Drolet wood stoves?

In Energy efficiency and durability | Asked by Paul Kuenn | Nov 23, 14

Window flashing and trim with exterior rockwool

In General questions | Asked by colin slade | Nov 25, 14

What's a good damper for a bath fan/range hood vent?

In Mechanicals | Asked by Nathaniel G | Nov 23, 14
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!