OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"

 
Thread Tools Search this Thread Display Modes
Old 08-07-2011, 08:13 PM   #1
Registered User
 
inm2002's Avatar
 
Trade: Homebuilder
Join Date: Aug 2010
Location: Dallas, Texas
Posts: 18
Rewards Points: 10

OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


Currently we space rafters 16" oc and use 7/16" OSB with H clips. We're in Dallas so we don't engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16" oc rafter spacing and 7/16" OSB decking.

I'm contemplating upgrading to 1/2" or even 5/8" OSB though to reduce roof sag hopefully to nil. We get snow from time to time, especially the last few years. We actually got a good accumulation of snow on the roof a few times. I'm see very minimal sag from time to time and want to cure that being a perfectionist. I'm considering what the additional cost is and whether it's worth the added expense.

Any input on whether the added thickness will help roof sag or should we go to 12" oc spacing. I'm thinking either way will cost quit a bit.

Thanks,
inm2002 is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   
 

Old 08-07-2011, 08:17 PM   #2
Geometrist
 
Warren's Avatar
 
Trade: framing/remodeling
Join Date: Feb 2005
Location: NE Ohio
Posts: 6,917
Rewards Points: 2,459

Re: OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


Keep the 16" oc, go with 1/2" osb, and add an extra clip in each space. Very economical upgrade.

Warren is offline  
Old 08-07-2011, 08:37 PM   #3
topsail's trimcat
 
woodworkbykirk's Avatar
 
Trade: finish Carpenter/ renovations
Join Date: Sep 2008
Location: ns, canada
Posts: 4,924
Rewards Points: 2,170

Re: OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


if were using osb we get 9/16, we dont worry about getting both 7/16 and 9/16 for walls then the roof, we just get all of the same.. this way no worrying about grabbing scraps to fill in small spots and not having the correct thickness.

most our truss packages come as 24" o.c code only calls for a single H clip between trusses but we do 2 per spacing to give it extra strength
__________________
putting down subfloor with glue and screws, well i saw dr. smith and the robot too , i had a martian burger and a sonic shake
woodworkbykirk is offline  
Old 08-07-2011, 08:53 PM   #4
Pro
 
slowsol's Avatar
 
Trade: Estimator / Preconstruction Manager
Join Date: Aug 2005
Location: Toledo, OH
Posts: 1,482
Rewards Points: 1,098

Re: OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


7/16" wall sheathing. 1/2" for roof sheathing. We get snow loads though.

I've never heard of 9/16" sheathing.
__________________
-John
slowsol is offline  
Old 08-07-2011, 09:30 PM   #5
Pro
 
superseal's Avatar
 
Trade: Masonry / Carpentry Construction and Restoration
Join Date: Feb 2009
Location: Southeastern PA
Posts: 3,391
Rewards Points: 2,562

Re: OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


1/2" is standard for 16oc around here, but I prefer 5/8" upgrade. I also like Warrens suggestion
superseal is offline  
Old 08-07-2011, 11:45 PM   #6
Capra aegagrus
 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 16,391
Rewards Points: 3,632

Re: OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


Our choices are 7/16 or 23/32. We get a fair to middling snow load here in central PA, and the 7/16 seems to do just fine on 16" centers.
Tinstaafl is online now  
Old 08-07-2011, 11:50 PM   #7
Pro
 
Dirtywhiteboy's Avatar
 
Trade: Home Framing- Roof Stacking
Join Date: Oct 2010
Location: Honolulu Oahu,Hawaii
Posts: 12,240
Rewards Points: 2,522

Re: OSB Roof Decking Thickness - 7/16", 1/2", Or 5/8"


We use 7/16 on a 2' OC with no snow load and use H clips
We use 5/8 on a 2' OC with no snow load and no H clips

__________________
I Have Done So Much With So Little For So Long, I Can Do Almost Anything With Nothing Now
Dirtywhiteboy is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Decking Care kenhue design General Discussion 1 02-24-2010 07:31 AM
Roof top decking Doing it right Decks & Fencing 8 02-06-2009 10:57 AM
glu-lams, and 2x6 T&G roof decking TurnkeyConst Construction 3 12-24-2007 01:48 PM
1/2" vs 5/8" roof sheathing MoW Roofing 8 12-31-2004 12:00 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?