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Old 06-05-2007, 10:33 AM   #1
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Oriented Strand Board (OSB) as Shed Siding


I have some questions about using OSB as siding for a small 10x12 foot shed. My construction is very simple, just 2x4 studs, 2-foot on-center covered with 7/16 OSB, smooth side out.

I live in a temperate climate (central California) and thought that it would be good enough to just paint the OSB; however, after the first coat of primer (worked in with brush), I notice several places where chips started to peel away. I've gone over the areas and followed up with 3 coats of exterior paint (generic "Conco Pro" contracter's paint), each time finding a few more wood peels.

Also, an OSB scrap I had leaning against the wall found a little bit of water at its edge that seeped along the concrete (morning dew that dripped from the gutter). The OSB had swelled up at the edge and was easy to crumble, just from this minute, indirect exposure.

The OSB that I bought is rated "Exposure 1" and also indicates "Exterior Type Adhesive"

I'm worried that my construction will not hold up, even in my mild climate.

Any ideas on what I can do to help this hold? I thought about buying some siding, but the stuff I find at Home Depot does not seem any better. It is either pre-painted OSB or particle board, and it's $20/sheet.

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Old 06-05-2007, 11:46 AM   #2
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Oriented Strand Board (OSB) as Shed Siding


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It is either pre-painted OSB or particle board, and it's $20/sheet.

LP Smart panel. 50 year waranty. Regular OSB will fail.

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Old 06-05-2007, 02:04 PM   #3
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Oriented Strand Board (OSB) as Shed Siding


My old man did the OSB thing. It really does not hold up well. It is still standing after 10 years in Eastern WA. It does not look good and it will probably not make another 10 years. You need to cover it with some type of siding. It could be vinyl Concrete lap siding anything that is made for exterior use. I found that lumber yards usually have a better price and can offer more help than a Home Dept or Lowe's.
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Old 06-05-2007, 02:43 PM   #4
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Oriented Strand Board (OSB) as Shed Siding


most important thing in shed is making sure mice cannot get in.... once they are in... your wife will ask it to be removed.... got this problem last year... then put a lot of concrete cement along the edge where wall meet floor... got it resolved this year... mice parting there all winter long last year....
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Old 06-05-2007, 04:25 PM   #5
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Oriented Strand Board (OSB) as Shed Siding


OSB, is NOT SIDING. It's sheathing and it's not meant to stay exposed like siding is. What made you think it was? Was it because it said "Exterior Type Adhesive"?
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Old 06-05-2007, 06:05 PM   #6
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Oriented Strand Board (OSB) as Shed Siding


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LP Smart panel. 50 year waranty....
http://www.siding4u.com/failing-siding-help.php
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Old 06-05-2007, 09:54 PM   #7
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Oriented Strand Board (OSB) as Shed Siding


wow I was looking at that omniboard stuff. Is that site just pushing an agenda or is it really bad stuff? Have you seen it fail? What do you recommend in place?
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Old 06-06-2007, 07:09 AM   #8
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Oriented Strand Board (OSB) as Shed Siding


I have never seen failure like that. But I have not been using it for 20 years either. Maybe 5
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Old 06-06-2007, 02:47 PM   #9
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Oriented Strand Board (OSB) as Shed Siding


I thought I could use OSB because that is the same way they build those pre-fab, or tuff shed type, sheds sold at home depot, and the siding they sell as well.

At least I have a good sheathing there so will look for some ultra cheap siding.

Thanks for the advice.
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Old 06-06-2007, 06:55 PM   #10
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Oriented Strand Board (OSB) as Shed Siding


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I thought I could use OSB because that is the same way they build those pre-fab, or tuff shed type, sheds sold at home depot, and the siding they sell as well.
Yes, they sell them like that and it's used for what it's supposed to be used for. SHEATHING NOT siding. You said so yourself that the siding is sold there as well.

Still don't understand what makes you think that sheathing can be exposed and used for siding.
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Old 06-07-2007, 01:35 AM   #11
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Yes, they sell them like that and it's used for what it's supposed to be used for. SHEATHING NOT siding. You said so yourself that the siding is sold there as well.

Still don't understand what makes you think that sheathing can be exposed and used for siding.
The guy thought it would work now he Knows it will not. It seems like an honest mistake. Heck the stuff will stand up for many years, it will look real ruff and not last forever but if you do not have the $. You could put it on and a couple of years later install real siding and have no problems. I have seen houses sit with the OSB for more than 2 years then be finished. Is it ideal, of course not, but it works in a pinch.
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Old 06-07-2007, 05:02 AM   #12
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Oriented Strand Board (OSB) as Shed Siding


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The guy thought it would work now he Knows it will not. It seems like an honest mistake.
We all make mistakes and learn from them, but it's like anything else you do with building products whether your a Contractor or DIY'er, you should always ask first before you do anything your not sure of so it doesn't turn out to be a costly mistake. Like I said before, what would make him think that it's alright, it's a building product and is something he doesn't do for a living.

You can't just go and build something without asking about it and hope for the best.

We all have a budget that we work with and there's no need to spend more money that we have to. I'm a Contractor and if I'm going to do something that I've never done before, I will ask first and find out what the right way to do it is.

I know this is a DIY'er forum, but DIY'ers can't just tackle building something without asking the right question first whether they come here and ask or ask someone at the lumberyard. If he asked someone first and told them here or at a lumberyard, maybe someone could've told him to use T-1-11 and installed it once labor wise and not have to buy sheathing and siding now, and even have to replace some of the sheathing now.
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Old 06-07-2007, 10:32 AM   #13
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Oriented Strand Board (OSB) as Shed Siding


When I was at Home Depot, I inspected their pre-built sheds out in the parking lot. They appear to have ONE layer of OSB on the exterior that is nailed to studs. The interior side of the OSB is stamped the same as the OSB that I bought, “Exposure 1, Exterior Type Adhesive,” amongst other information like mfg, part number, etc…

From the exposed edge of the OSB around the door opening, the thickness appears the same as what I bought, 7/16 or ½ inch. The exterior surface of the OSB has a coating that I will call “paint” because that is what it looks like, and there is obviously no other siding material as is visible from the exposed edge. The exterior surface is smoother than just simply being painted, perhaps because there was additional preparation to the exterior side of the OSB panel, either by application of some filler material or more likely some variation in the mfg process. Maybe the mfg glued on some plastic type coating when the OSB was pressed and cured?

I asked the “guy” at HD and he said it was basically just painted and that I could paint the OSB. I had about 15 gallons of extra paint laying around just getting old, so thought I would try it. It looks OK, but after several coats over the primer, I still noticed the problems I mentioned, peeling wood flakes.

Also, my options at HD seem limited. I could buy the same OSB “siding” they sell that looks like what the pre-built sheds used, just different color and pattern on the finished side. I could buy the pressed sawdust “siding” that is basically the same as the OSB “siding.” I could get some of that wavy sheet metal, fiberglass, or plastic stuff. Then there is regular old plywood (which may present similar long-term failure modes). And last, maybe stucco.

I’ll have to look into the T-1-11, so thanks for the tip.

All is not so bad though. The OSB was only $6.50/sheet x 8 sheets ($52). The entire shed was $260 for materials. The pre-built sheds are near $3 grand.
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Old 06-07-2007, 12:10 PM   #14
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Oriented Strand Board (OSB) as Shed Siding


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Originally Posted by Cuc Tu View Post
When I was at Home Depot, I inspected their pre-built sheds out in the parking lot. They appear to have ONE layer of OSB on the exterior that is nailed to studs. The interior side of the OSB is stamped the same as the OSB that I bought, “Exposure 1, Exterior Type Adhesive,” amongst other information like mfg, part number, etc…

From the exposed edge of the OSB around the door opening, the thickness appears the same as what I bought, 7/16 or ½ inch. The exterior surface of the OSB has a coating that I will call “paint” because that is what it looks like, and there is obviously no other siding material as is visible from the exposed edge. The exterior surface is smoother than just simply being painted, perhaps because there was additional preparation to the exterior side of the OSB panel, either by application of some filler material or more likely some variation in the mfg process. Maybe the mfg glued on some plastic type coating when the OSB was pressed and cured?

I asked the “guy” at HD and he said it was basically just painted and that I could paint the OSB. I had about 15 gallons of extra paint laying around just getting old, so thought I would try it. It looks OK, but after several coats over the primer, I still noticed the problems I mentioned, peeling wood flakes.

Also, my options at HD seem limited. I could buy the same OSB “siding” they sell that looks like what the pre-built sheds used, just different color and pattern on the finished side. I could buy the pressed sawdust “siding” that is basically the same as the OSB “siding.” I could get some of that wavy sheet metal, fiberglass, or plastic stuff. Then there is regular old plywood (which may present similar long-term failure modes). And last, maybe stucco.

I’ll have to look into the T-1-11, so thanks for the tip.

All is not so bad though. The OSB was only $6.50/sheet x 8 sheets ($52). The entire shed was $260 for materials. The pre-built sheds are near $3 grand.
Yep I got about $ 3500 into my daughters playhouse which is 12 by 12 with a loft. No harm with the sheeting, just find a good siding you like. The problem is cheap (inexpensive) and siding do not go together Generally it is the most expensive part of a shed. You could look into metal siding that tends to be a little less expensive.
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Old 06-07-2007, 09:39 PM   #15
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Oriented Strand Board (OSB) as Shed Siding


So I'm finding out.

And I saw the future when walking around my neighborhood; I saw a house where the guy used painted OSB for his fence. Not a pretty site.

I'm starting to think about trying my hand at stucco. If I can do it, I might rip off the asbestos panels on the house and stucco it too. That's a small job too, less than 30x30.

Thanks for the help.

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