Welcome to the The Garage Journal Board forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   The Garage Journal Board > The Garage > General Garage Discussion

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-14-2010, 05:33 PM   #1
sevensandeights
Senior Member
 
Join Date: Apr 2009
Location: Mckean, PA
Posts: 218
Default OSB for interior walls - do I need an expansion gap?

I am putting up OSB on the interior of my garage and am wondering if I should leave an expansion gap around each edge. The OSB has something stamped on it that says to leave an 1/8" gap on all sides but it measures as a true 4'x8' so if I left a gap then sooner or later I would start missing studs.

It is a stick built garage on top of a cinder block foundation and the walls consist of the following (from outside to inside):

1.)vertical steel siding
2.) 2"x4" girts on 2' centers (perpendicular to the studs)
3.) 2"x6"x11' studs on 16" centers

I am using 7/16" OSB and the garage will be heated with radiant in-floor heat but not until next year. I live in the northwest corner of Pennsylvania and we do get a fair amount of humidity in the summer time. The garage will be fully insulated with R-19 batts in the sidewalls and R-38 cellulose in the ceiling. All of the insulatation should be in place withing the next month.
sevensandeights is offline   Reply With Quote
Old 11-14-2010, 05:36 PM   #2
toolfreak
Senior Member
 
Join Date: Jan 2006
Location: Illinois
Posts: 1,266
Default Re: OSB for interior walls - do I need an expansion gap?

Yes, my brother thought he didn't need to gap the edges and when it started to warm up the walls waved at him.
toolfreak is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 11-14-2010, 06:07 PM   #3
DGC15
Member
 
Join Date: Nov 2008
Location: Gatesville, TX
Posts: 48
Default Re: OSB for interior walls - do I need an expansion gap?

X2 on the gap. Absolutely necessary ! Top and bottom also
DGC15 is offline   Reply With Quote
Old 11-14-2010, 06:14 PM   #4
PassnThru
Senior Member
 
PassnThru's Avatar
 
Join Date: Jan 2010
Location: Bowling Green KY
Posts: 2,176
Default Re: OSB for interior walls - do I need an expansion gap?

I have OSB on my walls and on my ceiling. I have no gap and I have no issues with waving or anything else. Of course, I painted my OSB. One coat of primer and two top coats. The back side is unfinished but it is also against the vapor barrier on the insulation. My real world experience is that it is not an issue without gaps. As with everything, YMMV.
__________________
*** Looking to quote you here - preferably a quote you would rather we all just forgot. I'm watching.......
PassnThru is offline   Reply With Quote
Old 11-14-2010, 06:21 PM   #5
Bull
Super Moderator
 
Bull's Avatar
 
Join Date: Dec 2005
Location: MA
Posts: 15,532
Default Re: OSB for interior walls - do I need an expansion gap?

I am also using 7/16 OSB to do the inside of my Geobarn. I made that choice after reading a couple threads on here, neither of which mentioned any need for a gap. So, I hope I wont need one, because I haven't been leaving one! I have been caulking the seams prior to priming and painting, for a bit of a more finished appearance, too.
__________________

EUDAIMONIA
Bull is offline   Reply With Quote
Old 11-14-2010, 06:35 PM   #6
ishiboo
Senior Member
 
Join Date: Oct 2010
Location: Oshkosh, WI
Posts: 4,247
Default Re: OSB for interior walls - do I need an expansion gap?

Definitely need the expansion gap - fill it with painters caulk if you're painting, or tan caulk if you're not. Some people may get lucky but varying humidity, temperature swings, etc will definitely cause it to expand/contract.
ishiboo is offline   Reply With Quote
Old 11-14-2010, 06:54 PM   #7
sevensandeights
Senior Member
 
Join Date: Apr 2009
Location: Mckean, PA
Posts: 218
Default Re: OSB for interior walls - do I need an expansion gap?

For all of those who are using gaps - what are you doing about hitting studs after putting up 4 or 5 sheets? My walls are 60' long so it is a real concern.

The OSB I bought (made by Georgia Pacific) measures dead on at 48" x 96" so I would have to rip a 3/16" off the corner sheet and then 1/8" off every sheet after than or let it go for a few studs and then take 1" of one sheet to get back to the center of the stud. That certainly does not seem right.
sevensandeights is offline   Reply With Quote
Old 11-14-2010, 06:59 PM   #8
Dragster Racer
Senior Member
 
Join Date: Feb 2008
Location: Morrison, IL
Posts: 1,497
Default Re: OSB for interior walls - do I need an expansion gap?

No gaps, and no problems after two years.
Dragster Racer is offline   Reply With Quote
Old 11-14-2010, 07:06 PM   #9
walrus
Senior Member
 
walrus's Avatar
 
Join Date: Nov 2008
Location: Maine
Posts: 4,067
Default Re: OSB for interior walls - do I need an expansion gap?

No gap here, not in the ceilings or the walls. No issues here
walrus is offline   Reply With Quote
Old 11-14-2010, 07:08 PM   #10
garagejunkie
Junior Member
 
Join Date: Dec 2007
Location: South Dakota
Posts: 25
Default Re: OSB for interior walls - do I need an expansion gap?

Gaps?I didn't know I was supposed to leave gaps.Been up for 3 yrs & looks great.
garagejunkie is offline   Reply With Quote
Old 11-14-2010, 07:28 PM   #11
WNYflyer
Senior Member
 
WNYflyer's Avatar
 
Join Date: Sep 2009
Location: Lockport, NY
Posts: 480
Default Re: OSB for interior walls - do I need an expansion gap?

I believe GP's OSB panels are supposed to come from the mill at 7'-11 7/8" to allow for the 1/8" gap with like a tolerence of 0" over and -1/8" under. If your panels are truely 8'-0" as you said then I would say they don't meet GP's own spec. and I would probably be looking to return them.
WNYflyer is offline   Reply With Quote
Old 11-14-2010, 07:34 PM   #12
PassnThru
Senior Member
 
PassnThru's Avatar
 
Join Date: Jan 2010
Location: Bowling Green KY
Posts: 2,176
Default Re: OSB for interior walls - do I need an expansion gap?

I'll expand on my previous post with some more detail. My garage is 24X32 so the longest no-gap span I have is 32 feet. My garage has a natural gas heater in it but it does not run when I'm not in there. Over a year, I'd say the garage ranges in temperature between the low thirties and 100 degrees. The humidity here seems to range between 0 and 300 percent (yes - that's a joke - but we hit 100 often and it feels even worse than that). The OSB has also been up for 7 years. Are my walls and ceiling perfectly straight at all times? No - they aren't. But I seem to recall that they weren't before I put the OSB up either. I forgot to check the box for 100% straight lumber before they started. Everything expands and contracts with temperature - that's a scientific fact. The key is how much and so far it hasn't been enough to be noticeable for me.
__________________
*** Looking to quote you here - preferably a quote you would rather we all just forgot. I'm watching.......
PassnThru is offline   Reply With Quote
Old 11-14-2010, 07:35 PM   #13
Abbott
Senior Member
 
Abbott's Avatar
 
Join Date: Apr 2009
Location: U.S.A.
Posts: 1,688
Default Re: OSB for interior walls - do I need an expansion gap?

No gap here and everything is just fine.
__________________
Quote:
Originally Posted by Bull View Post

[In voice of Gronk, the caveman] "Uh, tool come from across Big Water. Tool bad. Man bad."
Abbott is offline   Reply With Quote
Old 11-14-2010, 07:40 PM   #14
cowboyjosh
Senior Member
 
Join Date: Mar 2010
Posts: 949
Default Re: OSB for interior walls - do I need an expansion gap?

In our AHJ no OSB is allowed for interior garage walls, doesn't matter if the garage is attached or detached, no OSB.

In areas that allow OSB, I have never seen any intentional expansion.
cowboyjosh is offline   Reply With Quote
Old 11-14-2010, 07:41 PM   #15
santagary
Senior Member
 
santagary's Avatar
 
Join Date: Mar 2010
Location: Pagosa Springs, Colorado
Posts: 726
Default Re: OSB for interior walls - do I need an expansion gap?

I have probably a hundred sheets butted up and no problems in my 80 by 90barn and 66 by 40 garage...never a problem!
santagary is offline   Reply With Quote
Old 11-14-2010, 07:49 PM   #16
moparhunter
Member
 
Join Date: Aug 2008
Posts: 52
Default Re: OSB for interior walls - do I need an expansion gap?

4 yearsno gap alls good here.
moparhunter is offline   Reply With Quote
Old 11-14-2010, 07:49 PM   #17
moparhunter
Member
 
Join Date: Aug 2008
Posts: 52
Default Re: OSB for interior walls - do I need an expansion gap?

4 years no gap alls good here.
moparhunter is offline   Reply With Quote
Old 11-14-2010, 08:14 PM   #18
AMCguy
Senior Member
 
AMCguy's Avatar
 
Join Date: Dec 2009
Location: Sunshine Coast, BC Canada
Posts: 672
Default Re: OSB for interior walls - do I need an expansion gap?

Because the strands are oriented mostly lengthwise there is very little (if any) expansion lengthwise. You can expect some expansion widthwise. Depending on humidity anywhere from zero to 1/8''. Just sitting in the yard, they may have grown all they are going to. I'd install them tight. Assuming you are running the sheets horizontally, you are only worried about the gap on either side of the middle sheet. If you left a bit of a gap above the top board and below the bottom board I can't see there ever being a problem.

Keep in mind, it is manufactured and marketed as an exterior sheeting, not an interior wall board. The installation instructions are there to give the best results in that application.
AMCguy is offline   Reply With Quote
Old 11-14-2010, 08:23 PM   #19
nmanitou
Senior Member
 
nmanitou's Avatar
 
Join Date: Mar 2009
Location: Michigan
Posts: 220
Default Re: OSB for interior walls - do I need an expansion gap?

I just installed my interior walls with OSB and no intentional gaps. Some gaps are there due to odd cuts here and there. What AMCguy said seems right to me.
nmanitou is offline   Reply With Quote
Old 11-14-2010, 09:07 PM   #20
sevensandeights
Senior Member
 
Join Date: Apr 2009
Location: Mckean, PA
Posts: 218
Default Re: OSB for interior walls - do I need an expansion gap?

Quote:
Originally Posted by WNYflyer View Post
I believe GP's OSB panels are supposed to come from the mill at 7'-11 7/8" to allow for the 1/8" gap with like a tolerence of 0" over and -1/8" under. If your panels are truely 8'-0" as you said then I would say they don't meet GP's own spec. and I would probably be looking to return them.
I just measured again and started at the 2" mark on the tape to eliminate any error with the end clip. The length was dead on at 96" and the width was 47-15/16".

Do other OSB manufacturers not require a 1/8" gap or is this just a GP thing?

Last edited by sevensandeights; 11-14-2010 at 09:16 PM.
sevensandeights is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 01:33 PM.