Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation


Thread Tools Search this Thread Display Modes
Old 03-17-2011, 11:28 AM   #1
Join Date: Mar 2011
Posts: 1
Share |

How many bags of blown-in cellulose insulation do I need

I have 2000 square feet of attic with a with an R value of 25-- How many bags of cellulose do I need to bring it up to an R-value of 49 or 60???

rschmiss is offline   Reply With Quote
Old 03-17-2011, 11:30 AM   #2
Jackofall1's Avatar
Join Date: Dec 2010
Location: Southern Michigan
Posts: 2,822

How many bags of blown-in cellulose insulation do I need

Hi and welcome rschmiss, to the best darn DIY'r site on the web.

Edit - Here is a guide to your answer - http://www.ehow.com/how_5896930_calc...age-attic.html

Lowes also has a calculator for the same purpose


When its all said and done there is usually more said than done

Last edited by Jackofall1; 03-17-2011 at 11:33 AM.
Jackofall1 is offline   Reply With Quote
Old 03-17-2011, 01:25 PM   #3
Join Date: Dec 2010
Posts: 13

How many bags of blown-in cellulose insulation do I need

There is no generic coverage chart for cellulose insulation -- or any other loose fill insulation for that matter. You will have to consult the coverage chart for the specific product you intend to install. On the chart you will find rows for R13, 19, 22, 30, 38 and 49. Some manufacturers provide additional R-value information. None of these rows will give you exactly R49 assuming an existing R25, but you can make a reasonable estimate. If your existing insulation is loose fill fiber glass there will be some compression if you put cellulose on top of it. In that case you may want to arbitrarily choose to install an additional R-30. The final insulation deck will cedrtainly be somewhere between R50 and R55.
dleaoh is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
cellulose over blown in fiberglass? deerhunter Building & Construction 1 10-29-2010 10:16 PM
Cellulose blown in insulation questions... 1eagertolearn Remodeling 3 10-01-2010 11:42 PM
Flat Roof and Blown Insulation... inlikeflint Building & Construction 4 01-26-2010 12:42 PM
Insulation - Cellulose vs. Icynene meth Building & Construction 24 04-29-2009 09:12 AM
Cellulose insulation as mulch gmatov General DIY Discussions 7 06-23-2008 06:45 PM

Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.