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Painted OSB Sheathing as Siding?

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Forum topic by Beginningwoodworker posted 906 days ago 8466 views 0 times favorited 19 replies Add to Favorites Watch
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Beginningwoodworker

13337 posts in 2276 days


906 days ago

I am planning on starting the repairs to my 10×12 shed,I am going to start by jacking it up. I have a painted OSB on the shed, I am wondering would painted OSB will hold up? I have some rot on the bottom that needs cutting off because water got in the shed.

-- CJIII Future cabinetmaker


19 replies so far

View FirehouseWoodworking's profile

FirehouseWoodworking

622 posts in 1877 days


#1 posted 906 days ago

OSB would not be my first choice. Any portion of OSB, such as the bottom edge or the backside on any overhangs, that is not sealed and/or painted is destined to fail and rot.

Pretty much the same for any manufactured wood product and even natural wood that is not naturally rot resistant such as pine.

It all comes down to the old adage: “Think like water.” If water can migrate to any portion of the siding that is unprotected (sealed, painted, caulked, etc.) it is destined to fail. And of course, that implies failure to conduct routine maintenance. Caulking never lasts forever. Occasional repainting is necessary. Good luck!

Cheers!

-- Dave; Lansing, Kansas

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richgreer

4522 posts in 1678 days


#2 posted 906 days ago

You can buy pressure treated plywood. It is intended to hold up to weather. In this area I have found that it holds up reasonably well for about 10 years. You should not paint it until it has aged a couple of years. It is probably your best low cost option for siding that is weather resistant.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

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Beginningwoodworker

13337 posts in 2276 days


#3 posted 906 days ago

I thought about making my own siding!

-- CJIII Future cabinetmaker

View lew's profile

lew

9954 posts in 2359 days


#4 posted 906 days ago

I agree with Dave.

Covered my garden shed (10×12) with OSB many years ago and kept it painted. That didn’t stop it from expanding, rotting and generally coming apart. If I were to do it again, I’d use something else.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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jack1

1909 posts in 2631 days


#5 posted 906 days ago

No, no, a million times NO! In one year (if you’re lucky) you’ll be using all those words we re not supposed to use with mom around. It’s only for under t-11 or some such.

-- jack -- ...measure once, curse twice!

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Beginningwoodworker

13337 posts in 2276 days


#6 posted 906 days ago

It done started rottening on the bottom, since the shed is on the ground. In a few weeks I am planning on jacking up the shed and put on two 4’’ soild concrete blocks and replace the flat roof with a gable roof.

-- CJIII Future cabinetmaker

View MoshupTrail's profile

MoshupTrail

287 posts in 1084 days


#7 posted 905 days ago

I agree with jack1 – absolutely NOT! unless you can find exterior graded OSB, like they put on roofs in some places. The problem is moisture will quickly degrade the glue and your OSB will begin to expand. As the layers spread they will hold more and more moisture leading to rot within a few years, depending on weather. And yes, that’s even when painted.

-- Some problems are best solved with an optimistic approach. Optimism shines a light on alternatives that are otherwise not visible.

View a1Jim's profile

a1Jim

112001 posts in 2181 days


#8 posted 905 days ago

OSB would not be my first choice but I’ve had pieces of it laying on the ground for two wet winters and not degrade. Don’t confuse OSB with partial board,Osb has much more resin in it than partial board . OSB will expand some but not fall apart because of it. If your budget will allow Charles I would go with Ply or T111 ,if you use OSB pre-paint it.

-- http://artisticwoodstudio.com Custom furniture

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Beginningwoodworker

13337 posts in 2276 days


#9 posted 905 days ago

I already have painted OSB on the shed, the top part is not rotten. I cant afford new siding at the momment. Just another coat of paint.

-- CJIII Future cabinetmaker

View Clarence's profile

Clarence

125 posts in 1710 days


#10 posted 905 days ago

Regardless of how long OSB lasts, it will always look like OSB.

-- Getting old is a good thing, but being old kinda stinks.

View Roz's profile

Roz

1658 posts in 2390 days


#11 posted 905 days ago

Hi Charles, I don’t like or recommend OSB for exterior siding. However, I have a cousin whose builder used it on an extension to her house and then covered it with battens and painted it very well. It has been there now over 20 years and is still looking good. You have to keep it painted and well away from contact with soil. If you are looking for an inexpensive siding I would consider 4X8 Masonite panels which have to be treated in much the same way.

-- Terry Roswell, L.A. (Lower Alabama) "Life is what happens to you when you are making other plans."

View Grandpa's profile

Grandpa

3054 posts in 1279 days


#12 posted 905 days ago

I go by a building and standards book when inspecting homes. It states that wood siding should be 12 inches (minimum) from the soil line. We don’t see that often but that is what the books says.

View Grandpa's profile

Grandpa

3054 posts in 1279 days


#13 posted 905 days ago

Ditto on what Steve said. It also comes with a paint or stain on it that has a 40 or 50 year warranty. I don’t like to paint.

View Beginningwoodworker's profile

Beginningwoodworker

13337 posts in 2276 days


#14 posted 905 days ago

Hardiplank siding is around 7 to 8 bucks at the home center. need around 56 peices thats $300 to $400 bucks!

-- CJIII Future cabinetmaker

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Grandpa

3054 posts in 1279 days


#15 posted 905 days ago

It can be bought around here from Lowe’s for about $6 on sale. It might never go back to that but that has been the past history. With that said this is a better product and you do pay for the extra life but in the long haul it will pay you back. You can cover it with OSB every few years and that will add up too. You have to decide where your budget will allow you to go and where you want to go.

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