3 in vs 6 in fiber glass


  #1  
Old 08-22-15, 12:22 PM
B
Member
Thread Starter
Join Date: Jun 2007
Location: NYC
Posts: 236
Received 0 Upvotes on 0 Posts
3 in vs 6 in fiber glass

Is there any difference in putting 3 in or 6 in fiber glass in a 2X4 out side wall. Is one any better or is the cost just a waste.I understand it might be better sound proofing.Just wondering.
 
  #2  
Old 08-22-15, 12:25 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Posts: 27,061
Received 1,910 Upvotes on 1,716 Posts
Yeah. You use 3 1/2" with a 2x4 wall and 5 1/2" in a 2x6 wall. If you want the best fiberglass for a 2x4 wall, get r-15.
 
  #3  
Old 08-22-15, 12:59 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,607
Upvotes: 0
Received 9 Upvotes on 8 Posts
You don't compress insulation, as it loses its ability to insulate the more the loft is reduced. As Brant says, look for the best for the space you have. Or if you want to get more insulative quality per inch, consider installing Roxul.
 
  #4  
Old 08-22-15, 12:59 PM
B
Member
Join Date: Oct 2008
Location: New England
Posts: 9,460
Received 47 Upvotes on 43 Posts
As XS said, they make a high density fiberglass insulation that will fit those 2x4 walls. FG insulation is actually rated in r-value per inch. When you compress the insulation you reduce the number of inches and thus the total achieved r-value. Besides, trying to stuff 6" insulation into a 3.5" wall is a pain.

Bud
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: