Attic Insulation Direction - Insulation - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 03-22-2012, 02:43 PM   #1
Join Date: Mar 2012
Posts: 4
Rewards Points: 10

Attic Insulation Direction

I just purchased my first single family home and I want to add insulation to the attic. It is a 57 year old house and has 3-4 inches of loose fill cellulose in the attic.

I'm going to add another layer of fiberglass insulation on top of it (without a moisture barrier). I've read online that if the existing insulation comes to the top of the rafters then the next layer should be laid perpendicular to the rafters. However, my existing insulation only comes about halfway up the board.

So my question is should the new insulation lay on top of the existing cellulose in the same direction, or should I go perpendicular to the rafters even though that would create a gap between the 2 layers?

Thanks in advance!
Attached Images


bmcnees16 is offline   Reply With Quote
Old 03-22-2012, 03:10 PM   #2
Thread killer
Join Date: May 2011
Location: Southwestern Ontario, Canada
Posts: 306
Rewards Points: 272

Attic Insulation Direction

If you haven't done it already, get in there and seal all the air leaks. Then blow in more cellulose. Don't waste your money on fiberglass anything.


Canucker is offline   Reply With Quote
Old 03-22-2012, 04:40 PM   #3
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,852
Rewards Points: 1,010

Attic Insulation Direction

agreed w/ canucker. batts are a poor choice, esp if left exposed to air currents in attics. air sealing is critical; any penetration should be goo'ed or spray foamed.
jklingel is offline   Reply With Quote
Old 03-23-2012, 12:51 PM   #4
Exterior Construction
Windows on Wash's Avatar
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 10,096
Rewards Points: 7,414

Attic Insulation Direction

Air seal and just blow more cellulose.

Leave the batts out.
Windows on Wash is offline   Reply With Quote

attic , insulation

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
Attic Insulation Help Needed-What type, etc HandyFrank Building & Construction 9 12-15-2011 02:54 PM
Help with complicated insulation project in attic OhmZoned Insulation 12 11-19-2011 09:49 AM
Attic insulation over old attic floor beffreyj3 Insulation 6 11-18-2011 08:21 AM
Blown in insulation for un-insulated attic Cubey Insulation 10 10-19-2011 08:08 PM
Adding attic insulation pomelo Building & Construction 3 10-22-2009 06:19 PM

Top of Page | View New Posts