Go Back  DoItYourself.com Community Forums > Interior Improvement Center > Basements, Attics and Crawl Spaces
Reload this Page >

floor joist crossbrace support needed when using furring strips??

floor joist crossbrace support needed when using furring strips??


  #1  
Old 10-28-15, 05:06 PM
R
Member
Thread Starter
Join Date: Sep 2008
Location: MA
Posts: 731
Received 0 Likes on 0 Posts
Question floor joist crossbrace support needed when using furring strips??

I'm trying to get the full sound dampening benefit out of using the roxul safe and sound in between the floor joists that lead to the upstairs. The more obstacles I have to go around the more air gaps are inevitably created. Can I take the cross braces off shown in the picture if I am using 1x4 furring strips for drywall across all the floor joists anyway?

Name:  20151028_184730.jpg
Views: 1464
Size:  30.7 KB
 
  #2  
Old 10-28-15, 07:18 PM
czizzi's Avatar
Member
Join Date: Jul 2007
Location: USA
Posts: 7,388
Received 15 Likes on 13 Posts
No, the braces serve the function of stiffening the floor system for the upstairs. It ties on floor joists to the adjoining joists so that three act as one. Horizontal 1x material has no lateral strength.
 
  #3  
Old 10-28-15, 08:42 PM
B
Member
Join Date: Oct 2008
Location: New England
Posts: 10,532
Received 42 Likes on 38 Posts
If you replaced the cross bracing with solid blocks of 2x 10 or 12, whatever those joists are, then the Roxul could be neater and you would still have the benefit of the bracing.

Bud
 
  #4  
Old 10-28-15, 09:14 PM
R
Member
Thread Starter
Join Date: Sep 2008
Location: MA
Posts: 731
Received 0 Likes on 0 Posts
Thanks for the replys. Do you know what the code would be for spacing if I were to do the blocks of 2x8? Or one block where every two cross supports were taken down?
 
  #5  
Old 10-28-15, 09:45 PM
B
Member
Join Date: Oct 2008
Location: New England
Posts: 10,532
Received 42 Likes on 38 Posts
I don't know the code requirement, but sure others do.

Since your objective is sound reduction, have you considered something like "z" channel instead of furring strips?

Bud
 
  #6  
Old 10-28-15, 10:11 PM
R
Member
Thread Starter
Join Date: Sep 2008
Location: MA
Posts: 731
Received 0 Likes on 0 Posts
I have, I am more concerned about air born sound like music and voices than anything else.
 
  #7  
Old 10-29-15, 06:14 AM
B
Member
Join Date: Oct 2008
Location: New England
Posts: 10,532
Received 42 Likes on 38 Posts
The sound you will hear will travel right through those 2x8's to the ceiling below, bypassing your insulation work.

Bud
 
  #8  
Old 10-31-15, 02:24 PM
R
Member
Thread Starter
Join Date: Sep 2008
Location: MA
Posts: 731
Received 0 Likes on 0 Posts
Any suggestions other than the 2x8's then?
 
  #9  
Old 10-31-15, 02:38 PM
B
Member
Join Date: Oct 2008
Location: New England
Posts: 10,532
Received 42 Likes on 38 Posts
If your floor joists are 2x8 and you want to eliminate the cross bracing, then solid 2x8 blocks will do that. Just make sure they aren't 1/8" larger than the existing ones that have shrunk.

As for noise, the solid blocking will not add measurably to the conductive sound transmission. To lessen the mechanical coupling, they use "z" brackets or other replacements for the strapping. I have no numbers on how successful the Roxul or the z-brackets will be.

Bud
 
 

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