Explain To Me - Construction - Contractor Talk

Explain To Me

 
Thread Tools Search this Thread Display Modes
Old 06-06-2006, 10:06 PM   #1
Pro
 
747's Avatar
 
Trade: Wood working in spare time.
Join Date: Jan 2005
Location: kankakee county,Illinois
Posts: 1,539
Rewards Points: 1,000

Explain To Me


I understand how rating works on plywood. Can you guys explain how rating works on OSB. Example 32/16 rating. What rating do you guys like to go with for OSB.
747 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!

   

Advertisement

 

Old 06-06-2006, 11:28 PM   #2
Pro
 
Teetorbilt's Avatar
 
Trade: Residential Contractor
Join Date: Feb 2004
Location: Jensen Beach, FL
Posts: 10,471
Rewards Points: 2,000

Re: Explain To Me


747, you know that I'd never use that splinterboard for anything. I'd double whatever CDX rating is and pray for no lawsuits in the future.

It may work in dryer climes but no way here.

Advertisement

__________________
You can't solve you're problems with the same level of thinking that created the problems.

Albert Einstein
Teetorbilt is offline  
Old 06-06-2006, 11:51 PM   #3
Pro
 
747's Avatar
 
Trade: Wood working in spare time.
Join Date: Jan 2005
Location: kankakee county,Illinois
Posts: 1,539
Rewards Points: 1,000

Re: Explain To Me


teeter i agree with you. But actually its used alot here in illinois. All the new construction homes roofs are sheathed in it. Personally if i was building a new house i would want 4 ply plywood on the roof at the very least.
747 is offline  
Sponsored Links
Advertisement
 
Old 06-07-2006, 08:16 AM   #4
FRAME ON!
 
A+Carpenter's Avatar
 
Trade: Decks,All phases of remodeling,
Join Date: Apr 2005
Posts: 1,653
Rewards Points: 1,000

Re: Explain To Me


Quote:
Originally Posted by Teetorbilt
747, you know that I'd never use that splinterboard for anything. I'd double whatever CDX rating is and pray for no lawsuits in the future.

It may work in dryer climes but no way here.

It makes good form board for custom concrete work. U-C-O stuff like that. Other than that it is garbage
__________________
A+Carpenter is offline  
Old 06-07-2006, 10:35 PM   #5
unlicensed hack
 
maj's Avatar
 
Trade: wood butcher
Join Date: Mar 2006
Location: North Pole
Posts: 1,087
Rewards Points: 500

Re: Explain To Me


Are you guys kidding me!!!! OSB is the norm around here. You couldn't give me plywood to use anymore. That chit delaminates and sags. Last time I used plywood for ANYTHING, I had to replace half of it. TOTAL CRAP!!!!! That was 12 years ago !!!!

747, OSB has the same ratings as plywood. The 32/16 you refer to is the maximum span you can go on roof/floor. IOW, 32" max. span on roof. 16" max. span for floor sheathing. We use 3/4" T&G for subfloor, 7/16" for wall sheathing, 5/8" for roof sheathing. We could use 1/2" for roofs, but then you gotta clip it.
__________________
The views expressed in this post are merely opinions of named poster and in no way shall be deemed meaningful by members of the herd. By no means does anything posted by named poster mean a damn thing for anyone else partaking in this thread.
maj is offline  
Old 06-08-2006, 06:36 AM   #6
Pro
 
Joasis's Avatar
 
Trade: General Contractor
Join Date: Mar 2006
Location: Hennessey, Oklahoma
Posts: 9,745
Rewards Points: 1,980

Re: Explain To Me


OSB is used in all constrution here...rarely do you see plywood go to a job site anymore. I think it is a major improvement over poor quality plywood.
Joasis is offline  
Old 06-08-2006, 08:34 AM   #7
Registered User
 
Grumpy's Avatar
 
Trade: Roofing and Gutter Specialist
Join Date: Oct 2003
Location: Chicago
Posts: 8,573
Rewards Points: 2,000

Re: Explain To Me


OSB has a rating of ZERO IMO. There should be a span rating on the OSB though.
__________________
-Grumpy
Chicago Gutters Chicago Roofing
Grumpy is offline  
Old 06-12-2006, 10:25 AM   #8
 
RowdyRed94's Avatar
 
Join Date: Jan 2006
Posts: 177
Rewards Points: 150

Re: Explain To Me


We use OSB almost exclusively except for the occasional main floor for ceramic tile purposes. It's flatter, more consistent and far easier to lay than plywood. I groan every time I see a unit of plywood on the job. Talk about trying to assemble a stack of Pringles into a building. That being said, the edges of OSB is known to swell on roofs even after construction from interior moisture. You can then see the truss positions on frosty mornings.

To answer the question, 7/16 on the walls and 1/2 on roofs at no more than 24" centers.

Last edited by RowdyRed94; 06-12-2006 at 10:27 AM.
RowdyRed94 is offline  
Old 06-12-2006, 07:22 PM   #9
Dan
 
ApgarNJ's Avatar
 
Trade: Remodeling Contractor
Join Date: Apr 2006
Location: Stockton, NJ
Posts: 4,822
Rewards Points: 2,000

Re: Explain To Me


OSB better be covered right away and most jobs they don't. i agree that plywood has taken a dive in the past few years as far as quality but I still use CDX for everything on my projects. 5/8 on the roof always. some guys use 1/2 and it's a joke. it's amazing how many guys just cut corners to save time and money. I do things the way they would be on my house, or tell the people to find someone else. my roofer won't even put shingles on an OSB roof. the nails pull right out.
and the nails don't hold too well into the osb wall sheathing too, for vinyl siding or any other kind of siding. the stuff is used all over, but it's crap and just a way for contractors and developers to make a dime.

most 1/2 cdx now adays is 3 ply. it really does suck too. gotta request 4 ply and it lays flatter.

i've written several letters to plywood manufacturers complaining about the poor quality of their plywood and it just start happening.
they just write back stating that 4 ply is available, but it's not the norm anymore and that CDX is really just interior plywood, with exterior glue, like i didn't already know that. lol

add plywood to just another item in the long list of things going down in quality, but up in price in our trade.
ApgarNJ is offline  
Old 06-12-2006, 08:31 PM   #10
Pro
 
River Rat Dad's Avatar
 
Trade: Roofing, siding, framing
Join Date: Feb 2006
Location: Ann Arbor MI
Posts: 365
Rewards Points: 250

Re: Explain To Me


We have used 5 ply 1/2" with good success, but it's often more expensive than 5/8".

I have used both CDX and OSB but with a Roofing background I prefer Plywood for holding nails...

And lets not forget OSB has those nice nailng lines as a reminder to PUT THE SHINEY SIDE DOWN because it has issues with moisture absorption.
River Rat Dad is offline  
Old 06-12-2006, 08:56 PM   #11
Pro
 
rayh78's Avatar
 
Trade: GC - Home repair
Join Date: Apr 2006
Location: Virginia
Posts: 277
Rewards Points: 290

Re: Explain To Me


If OSB gets wet it will not go back to orginal shape when it drys like plywood. And even manufactors dont rate it for horizonal applications.
rayh78 is offline  
Old 06-13-2006, 06:53 PM   #12
unlicensed hack
 
maj's Avatar
 
Trade: wood butcher
Join Date: Mar 2006
Location: North Pole
Posts: 1,087
Rewards Points: 500

Re: Explain To Me


Grumpy,rayh78, and anyone else who thinks OSB has no rating, here are some pics from some scraps left over from the house I'm building now. I thought OSB was pretty common throughout the country, but here again, must be a regional thing. NOBODY uses plywood here, that stuff is junk, even the 4 ply!!!

Ray, Why would they make 3/4" T&G subfloor then, if it's not rated for horizontal?

Explain To Me-osb1-edit.jpg

Explain To Me-osb2-edit.jpg
__________________
The views expressed in this post are merely opinions of named poster and in no way shall be deemed meaningful by members of the herd. By no means does anything posted by named poster mean a damn thing for anyone else partaking in this thread.
maj is offline  
Old 06-13-2006, 07:03 PM   #13
 
fettycan's Avatar
 
Join Date: Mar 2006
Posts: 43
Rewards Points: 25

Re: Explain To Me


how much does 1 piece of 7/16 OSB weigh?
fettycan is offline  
Old 06-14-2006, 12:41 PM   #14
 
RowdyRed94's Avatar
 
Join Date: Jan 2006
Posts: 177
Rewards Points: 150

Re: Explain To Me


If there was an issue with roofing nails pulling out, we'd know it. I certainly haven't seen any roofs blowing off around here. As for siding nails, they'd better be in studs anyway.

We rent a drum sander for every job and sand the swollen seams before flooring goes in. There's no detectable loss of rigidity and the flooring installers love us for it. With plywood subfloor, the tongues and grooves are often so misaligned that there's a square 1/8" drop from one sheet to another. Again, consistency of OSB far surpasses that of plywood.
RowdyRed94 is offline  
Old 06-14-2006, 02:39 PM   #15
carpenter and builder
 
Nick H's Avatar
 
Trade: carpenter and builder
Join Date: Nov 2005
Location: UK
Posts: 204
Rewards Points: 150

Re: Explain To Me


We still use alot of plywood in the UK but the quality can be pretty poor. I've had a lot of problems with boards being out of square and with edges that aren't straight. It makes a simple job like laying a floor a real pain when you are having to plane the boards to fit. I've also found that nails/screws can bury themselves to deep as the surface is so soft.

Advertisement

__________________
Dont give me problems, give me solutions.
Nick H 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
now explain this... J87513 Contractor Licensing 31 06-21-2007 09:25 PM
Explain To Me? 747 Electrical 2 01-06-2007 02:45 PM
Explain To Me? 747 Electrical 2 10-20-2006 10:57 PM
How to explain cost per job vs hourly rate? Kristina Business 19 04-22-2006 03:18 PM
explain granfathering 747 Plumbing 4 03-02-2006 04:18 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?