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Old 03-17-2011, 04:35 AM   #1
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3/4" osb or 3/4" plywood for new sub floor?


what are the pros and cons of 3/4 " osb vs plywood for new sub floor?

and if I go osb how long can it be exposed to the weather while I get the walls up and roof, can it get rained on or will that ruin it?

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Old 03-17-2011, 06:32 AM   #2
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3/4" osb or 3/4" plywood for new sub floor?


I am old school so my view are different from younger guys. I prefer plywood. It can get damp(neither likes WET/soaked) longer than OSB, and IMHO is stronger. Plywood is more expensive. Both are OK with most building codes, OSB is the construction preference because of cost.

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Old 03-17-2011, 06:33 AM   #3
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3/4" osb or 3/4" plywood for new sub floor?


Everything depends on the weather, how complex and time consuming the house is, and quality of help you have, and how soon you can get it under roof. OSB or plywood are good products, but I'd go with plywood if you have a crawl space over dirt, with moisture conditions, and use glue , squeaks are hell.
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Old 03-17-2011, 08:20 AM   #4
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3/4" osb or 3/4" plywood for new sub floor?


Hey Treerat,

I have experience with how OSB and plywood will react over time outdoors. OSB will eventually get ruined. It absorbs water, swells up, and start to crumble into pieces. Regular plywood is a little bit better. It doesn't absorb as much water, it will still swell, and it will warp, but wont fall apart as easily. I would definitely go with regular 3/4" plywood. What are you doing exactly?-Gregg
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Old 03-17-2011, 08:27 AM   #5
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3/4" osb or 3/4" plywood for new sub floor?


Neither one of those are a good choice at all because you stated that moisture and rain will be a factor.

Advantech ....period!!!!!

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Old 03-17-2011, 08:43 AM   #6
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3/4" osb or 3/4" plywood for new sub floor?


Yup, Advantech.
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Old 03-17-2011, 08:43 AM   #7
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3/4" osb or 3/4" plywood for new sub floor?


Whichever you choose don’t build your floor and then the walls in a couple of months and the roof months after that. I’d get everything together and not start until you can at least get it all dried in.
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Old 03-17-2011, 11:39 AM   #8
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3/4" osb or 3/4" plywood for new sub floor?


this is a bathroom REBUILD! foundation up, one person show. probabably take me about 3 weeks, but its spring and I can expect rain every other day, just wanted to know if osb would survive that amount of time and getting soaked every few days? would a tarp help much?
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Old 03-17-2011, 12:11 PM   #9
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3/4" osb or 3/4" plywood for new sub floor?


You should be fine, just make sure you have a sufficient tarp to cover it all and focus on the roof and siding before messing with the inside.
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Old 03-17-2011, 03:39 PM   #10
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3/4" osb or 3/4" plywood for new sub floor?


Quote:
Originally Posted by treerat View Post
this is a bathroom REBUILD! foundation up, one person show. probabably take me about 3 weeks, but its spring and I can expect rain every other day, just wanted to know if osb would survive that amount of time and getting soaked every few days? would a tarp help much?
Adventech is one of many brands out there for subflooring. Most T&G (tongue&groove) plywood that are worth anything is coated with some type of water resistant coating. They can get wet, but clear off the water everyday and you shouldn't have an issue. A tarp certainly can't hurt.
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Old 03-17-2011, 03:58 PM   #11
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3/4" osb or 3/4" plywood for new sub floor?


Advantech would be my material of choice. We work with it a lot around here. Advantech will survive some weather and delays if you don't abuse the privilege. Be ready to keep moving once the product begins. Advantech is treated somewhat but if it gets too wet too many times the panels will edge-swell a little. Even that isn't the end of the world. The swelled edges can be sanded if they are a problem for some reason.

You'll be fine if it is only a three week project but get it in-the-dry ASAP.
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Old 03-17-2011, 04:04 PM   #12
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3/4" osb or 3/4" plywood for new sub floor?


Here's a link to Durastrand flooring- OSB, not plywood.

http://www.ainsworthengineered.com/a...oors/flooring/

I have used them in the past with good results.
Most likely not available at big box places- check with local builder supply (ABC, ProBuild, etc).
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Old 03-17-2011, 04:17 PM   #13
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3/4" osb or 3/4" plywood for new sub floor?


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Advantech would be my material of choice.
And how much a sheet on Adavntech. Never seen it out here.
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Old 03-17-2011, 04:27 PM   #14
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3/4" osb or 3/4" plywood for new sub floor?


Regular OSB will edge swell= irreversible. Use plywood or an "enhanced product" pp. 2: http://www.utextension.utk.edu/publi...files/W176.pdf
I drill holes in the shallow puddles soon as they form on a large house deck, if no plastic in crawl yet. Use a tarp (remodels I tie it to house tails, use ropes and pulleys for a giant Roman shade), cover the wood from the sun, etc.

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Old 03-17-2011, 06:39 PM   #15
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3/4" osb or 3/4" plywood for new sub floor?


Quote:
And how much a sheet on Adavntech. Never seen it out here.
Haven't a clue.

I just know that my builders that use Advantech compared to my builders that use OSB from the box stores cause me a whole lot fewer headaches when it comes to prepping a substrate for a tile installation.

It's hard to compare one new home to another because of the variables in weather exposure and time of year during construction but hands down Advantech performs better than the other products.

That's not to say I don't have any edge-swell to deal with because I do. It is the degree of edge-swell that seems to be a lot less with Advantech.

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