Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-01-2012, 06:51 PM   #1
Newbie
 
Join Date: Jan 2012
Posts: 4
Share |
Default

Osb


Got a curious question here...

what is the deal with the odd sizes for OSB?

7/16 is obviously cheaper than 19/32, but is there a big enough difference between the two to select the 19/32?

what is up with the size, 19/32.......i don't get it.

i put a sub floor in my attic above my garage and used 19/32 (mostly because i didn't see that Lowe's sold 7/16.

would any of you selected the 7/16 over 19/32 for a sub floor above your garage? also, is there a significant difference in its weight.

i tried to find information concerning their weight, strength and such.

sorry for the ramble, but i am second guessing my choice of 19/32 and am somewhat concerned about the extra weight in my ceiling in my garage.

rwreuter is offline   Reply With Quote
Old 01-01-2012, 07:35 PM   #2
MarginallyQualified
 
Join Date: Dec 2011
Location: Winston-Salem NC
Posts: 3,647
Default

Osb


Quote:
Originally Posted by rwreuter View Post
what is up with the size, 19/32.......i don't get it.
5/8" = 10/16" = 20/32" <-- right?
A surface layer of Tyvek (or other/similar) is how thick?
Lets call it 1/32" OK? 20/32-1/32 = what?

Quote:
would any of you selected the 7/16 over 19/32 for a sub floor...?
I wouldn't have gone any thinner than 19/32"

hth

TarheelTerp is offline   Reply With Quote
Old 01-01-2012, 11:54 PM   #3
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

Osb


The 7/16" is only for floor joists 16" on center, the other is for 16, 20, 24" o.c.: http://webcache.googleusercontent.co...ient=firefox-a

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
The Following 3 Users Say Thank You to Gary in WA For This Useful Post:
ben's plumbing (01-02-2012), mae-ling (01-02-2012), rwreuter (01-02-2012)
Old 01-02-2012, 08:34 AM   #4
Newbie
 
Join Date: Jan 2012
Posts: 4
Default

Osb


Quote:
Originally Posted by GBR in WA View Post
The 7/16" is only for floor joists 16" on center, the other is for 16, 20, 24" o.c.: http://webcache.googleusercontent.co...ient=firefox-a

Gary

Thanks for the info!!! Best i have read so far.
rwreuter is offline   Reply With Quote
Old 01-02-2012, 11:58 AM   #5
journeyman carpenter
 
woodworkbykirk's Avatar
 
Join Date: Sep 2011
Location: nova scotia canada
Posts: 2,645
Default

Osb


if its for a floor i wouldnt be using either, id be using 11/16"s. its actually designed to use as a sublfoorm 7/16 and 19/32 are for wall sheathing and roof sheathing
woodworkbykirk is offline   Reply With Quote
Old 01-02-2012, 02:58 PM   #6
Member
 
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,845
Default

Osb


Not to divert too much, but why IS OSB material made in odd dimensions? Is 7/16 the "strength equivalent" of 1/2" ply, etc, or has 1/2" ply been tweaked down, too? It sure would be nice to have uniformity in dimensions. I also think that "2 by" material should be the full 2" x 6", etc; let the rough cut vary, as it does anyway. But, that is a dream....
jklingel is offline   Reply With Quote
Old 01-02-2012, 05:48 PM   #7
Newbie
 
Join Date: Jan 2012
Posts: 4
Default

Osb


Quote:
Originally Posted by woodworkbykirk View Post
if its for a floor i wouldnt be using either, id be using 11/16"s. its actually designed to use as a sublfoorm 7/16 and 19/32 are for wall sheathing and roof sheathing
even if it is for a floor in an attic above a garage which will only be used for storage?
rwreuter is offline   Reply With Quote
Old 01-02-2012, 06:49 PM   #8
Framing Contractor
 
Join Date: Apr 2006
Location: Caldwell, NJ
Posts: 1,758
Default

Osb


Quote:
Originally Posted by GBR in WA View Post
The 7/16" is only for floor joists 16" on center, the other is for 16, 20, 24" o.c.: http://webcache.googleusercontent.co...ient=firefox-a

Gary
Gary,

Who uses 7/16 on top of floor joists?
__________________
Joe Carola
Joe Carola is offline   Reply With Quote
The Following User Says Thank You to Joe Carola For This Useful Post:
woodworkbykirk (01-02-2012)
Old 01-02-2012, 07:01 PM   #9
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

Osb


The site was "printed in Canada"........ I didn't write the article.
Not me, I wouldn't use it for sheathing, or firewood.

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
The Following User Says Thank You to Gary in WA For This Useful Post:
woodworkbykirk (01-02-2012)
Old 01-02-2012, 07:23 PM   #10
Member
 
Join Date: Feb 2009
Location: St. Louis, MO
Posts: 93
Default

Osb


Quote:
what is up with the size, 19/32.......i don't get it.
Once upon a time, you could go into a hardware store and buy 3/4" plywood. Now you have to get 23/32". Was there some remarkable only recently discovered technical innovation? I say no. My suspicion is too many lawyers. A few years back 3M company was successfully sued by the State of California for tens of millions of dollars because the 1" cellophane tape the state was buying was only 0.9 something inches wide. Now there is no 1" tape. Just undimensioned tape. Why should a lawyer have to understand that a dimension always implies some real tolerance when they can make millions on the minus tolerance? Feel lucky that they still provide any thickness measurements at all. The companies could have protected themselves from lawsharks by identifying different thicknesses with names (4x8 foot sheet of Ralph) and letting the buyers figure out what Ralph corresponds to.
mwpiper is offline   Reply With Quote
Old 01-02-2012, 08:58 PM   #11
journeyman carpenter
 
woodworkbykirk's Avatar
 
Join Date: Sep 2011
Location: nova scotia canada
Posts: 2,645
Default

Osb


what?????? that last post is pointless.

the reason for 11 /16" and the like is more do to how dense the wood is now .. it gets pressed tighter,, but anyhow.. i would never use 7/16" for floor subfloor.. 7/16 fir plywood as underlay yes.. which goes over top of subfloor
woodworkbykirk is offline   Reply With Quote
Old 01-02-2012, 10:39 PM   #12
Just a DIY guy
 
Join Date: May 2011
Location: Southern California
Posts: 297
Default

Osb


We used 1/2 inch or 15/32 in my garage attic, primarily due to weight, but it's plenty sturdy for light storage, even with 24" oc joists. It's not solid like a real floor, but enough for the use. Maybe it was 7/16, I didn't put it in, my contractor did, and he said it was 1/2 (which we know does not exist).

I am building a similar floor in my house attic with 19/32 tongue and groove SturdiFloor, again with 24" oc joists, and the one 4x8 sheet that is fully screwed down feels very solid. again it will be for storage. A "real" floor should have 3/4 or 1 inch subfloor, IMO.


Last edited by M3 Pete; 01-02-2012 at 10:41 PM.
M3 Pete 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.