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Old Mossy Horns
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So I replaced 2 shooting roofs this year. Both took 2 sheets of 4x8 particle board. I just replaced old with new. Sealed seams where they met and even put another strip of OSB over the seam. Still had water seeping into house soaking the chairs and floors so I’m going to put metal roofs on them now. My question is should I just pull off the OSB and replace it or can I just put new metal on top of OSB. I’m worried that water will get under the metal and soak the OSB and I’ll have an issue there. All opinions welcome.


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just strip with 1x4 over the existing osb and make sure you have good overhang with the metal and you should not have an issue.

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Why would you use particle board?

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Old Mossy Horns
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Originally Posted by jmj120
Why would you use particle board?

It was cheaper than plywood…by a lot. Got what I paid for I guess.

Last edited by bamaeyedoc; 02/04/25 01:41 PM.

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Freak of Nature
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Put the metal over the OSB with plenty of overhang as JKlep said . Lathing strips are optional IMO on the OSB for a shooting house application.



"Why do you ask"?

Too many people spend money they don't have , on things they don't need, to impress people they don't know.







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Freak of Nature
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Originally Posted by bamaeyedoc
Originally Posted by jmj120
Why would you use particle board?

It was cheaper than plywood…by a lot.


Wait, is it OSB or particle board , there's a difference . Particle board and water don't mix , it should never be used for subflooring , storm sheeting or roof decking. OSB is what's used most nowdays.



"Why do you ask"?

Too many people spend money they don't have , on things they don't need, to impress people they don't know.







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Old Mossy Horns
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Originally Posted by 2Dogs
Originally Posted by bamaeyedoc
Originally Posted by jmj120
Why would you use particle board?

It was cheaper than plywood…by a lot.


Wait, is it OSB or particle board , there's a difference . Particle board and water don't mix , it should never be used for subflooring , storm sheeting or roof decking. OSB is what's used most nowdays.

Particle board. I was thinking they were same thing. Not the case.


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14 point
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you can try this on the joints - I've used something similar on a 5th-wheel roof (rubber membrane was leaking). It will seal the joint - maybe use a couple of staples in areas that you think might curl.

https://www.amazon.com/Typar-Self-A...71J3/ref=cm_cr_arp_d_product_top?ie=UTF8

Last edited by Hunting-231; 02/04/25 01:44 PM.

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12 point
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I would use the metal roof seam tape if you are using more than one sheet width of metal roofing panels. I am guessing the roof is not flat but if flat I would create a slope for the metal.


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12 point
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Originally Posted by Hunting-231
you can try this on the joints - I've used something similar on a 5th-wheel roof (rubber membrane was leaking). It will seal the joint - maybe use a couple of staples in areas that you think might curl.

https://www.amazon.com/Typar-Self-A...71J3/ref=cm_cr_arp_d_product_top?ie=UTF8

Great minds.....


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12 point
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Originally Posted by bamaeyedoc
Originally Posted by jmj120
Why would you use particle board?

It was cheaper than plywood…by a lot. Got what I paid for I guess.

Particle board acts like a sponge!


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Freak of Nature
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Originally Posted by bamaeyedoc
Originally Posted by 2Dogs
Originally Posted by bamaeyedoc
Originally Posted by jmj120
Why would you use particle board?

It was cheaper than plywood…by a lot.


Wait, is it OSB or particle board , there's a difference . Particle board and water don't mix , it should never be used for subflooring , storm sheeting or roof decking. OSB is what's used most nowdays.

Particle board. I was thinking they were same thing. Not the case.


I'd take it off and lathe it with 1x4 or 2x4 and not even deck it , unless you want to seal it, then use OSB or exterior plywood. 1/2" 3 ply would work for plywood.

Just high humidity will cause particle board to swell and come apart. It needs to "breath" but be in a dry location. It's rarely used in residential construction now. Used to be installed between carpet and subflooring.

Last edited by 2Dogs; 02/04/25 01:58 PM.


"Why do you ask"?

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B
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Old Mossy Horns
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Screw the metal roof on the particle board. You will be fine.

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Freak of Nature
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Originally Posted by BPI
Screw the metal roof on the particle board. You will be fine.


After the April showers , the particle board will swell, deteriorate rapidly and the screws won't hold. He'll have to completely re-do it in a year or two .



"Why do you ask"?

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B
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Can you paint it with a good elastomeric roof coating paint?


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Originally Posted by bamaeyedoc
Originally Posted by jmj120
Why would you use particle board?

It was cheaper than plywood…by a lot. Got what I paid for I guess.


Yeah Particle board doesn’t like moisture at all. I’d strip all of that stuff off

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Freak of Nature
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bamaeyedoc - are you talking particle board or OSB?


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I put osb under my metal for the noise dampening when raining, acorns falling, etc

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Grumpy Old Man
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Problem solved.

[Linked Image]


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Booner
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Remove particle board and replace. Then use metal with good overhang as roof you can replace particle board with osb or plywood if you want

I have some roofing tarpaper you can have if it would help.


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