Blow-in Insulation - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 03-11-2008, 09:32 PM   #1
jelly's Avatar
Join Date: Oct 2007
Location: jersey shore
Posts: 316
Rewards Points: 330

Blow-in Insulation

I just had all the siding removed from my house but before the vinyl goes up I want to insulate my walls. I have 60 feet of 9 foot walls. I need to subtract 5 (3x5) windows. How do I calculate how many bags I need for a 85 year old house in New Jersey? Is it worth it to fill above and below windows?

I read to use roughly one 30-pound bag of cellulose for every three wall cavities and another source said to use 3.5 lbs per square. ????

What's the advantage to a "two hole method" versus drilling only one hole at the top of the stud cavity? Airflow is not a concern with my project, there is a 1/8 gap between all the 1"x8" sheathing.

I called Home Depot and get a free blower rental with the purchase of 20 bags of GreenFiber Blow-in Insulation (thanks for the tip redline!)


jelly is online now   Reply With Quote
Old 03-11-2008, 10:01 PM   #2
Join Date: Dec 2005
Posts: 74
Rewards Points: 85


Did this a few years ago but here's how I recall it. A bundle of the cellulose gets about 30 square feet. So figure with loss one bundle will give you a 5' by 5' square (thats with 2 by 4 studs in your walls). You need the two hole method, first filling from the bottom, so you will have and idea when the cavity is filled of close to it. Also as your filling from the bottom cover the top hole so the cellulose does not blow out as your putting it in from the bottom. You want to fill every cavity you can get at, around window and doors.
I'm not sure if you plan on doing this from the inside of the structure or the exterior wall. My installation was on the inside walls and went with 2" holes, cutting them out with a rotozip. To plaster afterwards I stuffed newspaper in the hole to give me backing for the plaster repair.

Best of luck with the project, rredogg


rredogg is offline   Reply With Quote

Thread Tools
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
Cape Cod Style House Attic/Crawl Space Insulation Help Danielg Insulation 24 05-21-2012 08:20 AM
Insulation - Rolls vs Blow In tyreal78 General DIY Discussions 6 12-15-2007 06:49 PM
attic insulation question dderolph Building & Construction 10 11-03-2007 05:21 PM
Blow in insulation Iowabucks General DIY Discussions 1 10-09-2007 08:20 AM
Installing new insulation in my basement and removing the old moldy insulation. Fixitgeorge Remodeling 3 10-17-2006 08:33 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1