Damp mushy Particle board


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Old 07-22-20, 03:35 AM
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Damp mushy Particle board

New to me house, Finally got up to clean gutters around enclosed patio.. Guess was years since they were cleaned and water backed up into the edge of under layment of roof. Is a rubber membrane over it looks like particle board. could only lift a small piece about 2 to 3 inches but what I saw was some mushy board. did not disturb it and rest roof looks good. Do you think board will dry out and be ok for a while. Roof not leaking and gutters clear now so should not get any more water to it.Just see if I should plan on a new roof soon or if I have more time.
Thanks Don
PS Will give it a few weeks and check how roof is doing.
 
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Old 07-22-20, 04:24 AM
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Particle board or OSB?
I've never seen particle board used on a roof but most mobile homes use it for a subfloor and once the PB gets wet enough to be mushy it's toast. It can dry out but won't be as strong and it will swell in the process.
 

Last edited by marksr; 07-22-20 at 04:58 AM. Reason: worded one senetence wrong
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Old 07-22-20, 04:43 AM
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Once particle board has gotten soaking wet it is done. The wood swells breaking the glue's bonds that hold it together so even after it dries you're left with loose wood flakes and little to no strength.
 
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Old 07-22-20, 05:37 AM
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Will give it a few weeks to dry and see what kind of board it is. Just guessing it was particle board.but did n ot get a good look at it. Just know it was wet and sorta looked like particle board. Answers were what I thought but always hoped for something different. Guessing room was built in the 80's but really have no idea.
 
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Old 07-22-20, 06:18 AM
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Lets assume that nobody in their right mind would use partical bard for a roof and what you have is OSB.

OSB is water resistant but it has it's limits, and if saturated for extended periods of time it too will take on water.

Hopefully you can get into the attic area and read what is printed, it's intended to be print side inward!
 
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Old 07-22-20, 10:39 AM
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It should be an easy job to identify if it's particle board, OSB or plywood from the underside.
The biggest issue is whether or not the roof decking will still hold the nails.
 
 

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