1" osb?


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Old 12-15-18, 03:18 PM
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1" osb?

I can't seem to find 1" OSB in any hardware stores. Would it be acceptable to put 2 times 1/2" OSB say one layer longitudinally and the other laterally as a subfloor?
Joists are 27" apart
 
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Old 12-15-18, 04:54 PM
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If it was mine I'd be using a layer of Advantech with glue on top of the joist, then a layer of 1/2" plywood or OSB over that making sure the seams did not line up with the seams below, and not nailing the second layer to the joist and also no glue between the layers.
Your idea of using 1/2 ws tried and failed back in the 70's around here and it made one bouncy floor.
 
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Old 12-15-18, 05:25 PM
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What thickness advantech?
why is 2 layers of 1/2" more butbou then just one layer of 1".
I have the same issue anyway, can't find 1" subfloor material anywhere
 
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Old 12-16-18, 03:01 AM
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What type of floor joists do you have that are 27" apart?
You might find 1" plywood at a specialty shop but it wouldn't be cheap.
 
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Old 12-16-18, 04:23 AM
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100 year old house. Joists look like 3"x11" (actually 3" not 2.5)
the entire house is like that, studs are 24-27" as well in places.
there isn't 1" in any hardware stores so what should I use? 7/8, 23/32?
 

Last edited by qwertyjjj; 12-16-18 at 04:56 AM.
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Old 12-16-18, 04:55 AM
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Old lumber can be surprising, I inspected a house that a friend of my sons was considering buying and was shocked that the solid floor was supported by 2x6 joists on 24" centers.

How big of an area do you need to replace? maybe use 3/4" and shims.
 
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Old 12-16-18, 09:17 AM
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What are the shims for, you mean leveling?
it's the entire floor, 1000sq ft, which is why I'm looking at OSB
 
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Old 12-16-18, 09:21 AM
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If it's the entire floor, why does it have to be at the 1" height? If I needed the 1" I'd strip the tops of the joists with 1/4" lattice and then lay the 3/4" subfloor.
 
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Old 12-16-18, 09:31 AM
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Everything I've read seems to day they 3/4 is only good for joists on 24" spacing. After that you have to go thicker. Maybe osb is stronger?
the existing subfloor (although 100 years old) is 1"
 
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Old 12-16-18, 09:39 AM
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Oh shoot, I forgot you didn't have standard joist spacing Since you have it all opened up, see what it takes to add joists in the middle .... paying attention to where the 4' and 8' marks are.
 
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Old 12-16-18, 12:19 PM
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I believe plywood is stiffer not sure its any stronger than osb, see 7/8 plywood or 1 inch osb recommended while those sizes probably are not commonly used anymore I would think you should still be able to order it in, even if its not stocked.
 
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Old 12-17-18, 10:10 AM
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If you have Menards up there I see they have 1-1/8" tongue and groove plywood or osb, later is $2 cheaper.

1000 sq ft would be around $1,550.00


https://www.menards.com/main/buildin...F8+inch&ipp=36


 
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Old 12-17-18, 06:30 PM
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I also have the option of re-using the 18ft x 1" thick planks that have been there for 100 years... if tthey''e still flat but some seem to crack easily

And 2 layers is not a good idea? Say 3/4 then another 3/4 with edge in different place
 
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Old 12-18-18, 09:10 AM
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Old 12-18-18, 01:45 PM
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you could check with a sawmill see what kiln dried lumber would cost since your looking at a lot of expense anyway would probably consider all options.
 
 

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