Plywood Buckle

 
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Old 05-30-2012, 06:59 PM   #1
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Plywood Buckle


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Shown are 3 photos from an estimate/inspection I was at. The structure is less than 10 years old. The rear roof plane is buckling plywood all over - to the point where it lifted drip edge 2" off the roof.

The facts:
-4:12 pitch
-Full Ice and Water, OC Duration shingle
-No leaks.
-Soffit ventilation (not perf soffit, vented through ribs only) and baffles in rafters.
-OC rolled ridge vent, cut to show 1" on each side of LVL ridge beam.
-All nails showing rust in attic.
-Plywood stapled, 16" O.C.
-Sufficient attic insulation.
-Heating system in attic.


I am thinking it's a combination of a lot of things but would truly like to hear some others thoughts.
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Old 05-30-2012, 07:05 PM   #2
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Re: Plywood Buckle


Staples and plywood are a bad combination. 3 ply plywood is the worst. Having the heating system up there certainly adds to the problems, especially with moisture.

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Old 05-30-2012, 07:48 PM   #3
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Re: Plywood Buckle


We fixed a similar problem 3 years ago. The addition had no heat except a fire place. Probably 60% of the nails missed the rafters.

They also only had 1 row of baffles and it was cathedral for 6 ft. We added the baffles and nailed the plywood. I went back about 6 months ago for a chimney issue and it looked great. The chimney issue was a waterproofing the old brick. The addition was about 7 years old when we stripped it.

The big problem was the 4ft seams. The missed the first 2 or 4 nails and the seams were rolling up. (which matches your pics) I would guess missing fasteners and staples are a bad idea.

Joe
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Old 05-30-2012, 07:57 PM   #4
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Re: Plywood Buckle


Oh and a bunch of seams didn't break on the rafters by the end of the run. It was a while ago the pics brought some thins back.
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Old 05-31-2012, 06:56 PM   #5
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Re: Plywood Buckle


This does seem simmilar. I didn't think it was any 1 thing in particular, yet all (staples, needs more vent, heating system).
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Old 06-01-2012, 09:45 AM   #6
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Re: Plywood Buckle


we have all seen the piles of warped plywood at the yard so why do people think a few nails will hold it flat?

about 16 2" screws along with the gun nails and the above probebly wouldnt have happened
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Old 06-01-2012, 09:56 AM   #7
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Re: Plywood Buckle


You don't need screws to fasten plywood, but this would never happen if the plywood was installed and nailed correctly.
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Old 06-01-2012, 08:58 PM   #8
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Re: Plywood Buckle


We put plywood on the time with just nail guns all the time with no problem...screwing down plywood seems unneeded...JMO
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Old 06-04-2012, 08:37 PM   #9
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Re: Plywood Buckle


YOU SAID THAT ALL THE NAILS WAS RUSTED ON THE UNDERSIDE OF THE SHEATHING AND THAT THE HVAC SYSTEM WAS IN THE ATTIC. I WOULD PROBABLY SAY THAT IN THE WINTER WHEN THE ATTIC SHOULD BE COLD. ( and as u probably already know that the attic needs to stay the same temp as the outside air or as close as it can be in the winter) U PROBABLY HAVE A LEAK IN THE HEAT RUNS OR IN THE TRUNK LINE. WHEN COLD AND HOT MEET IT WILL CAUSE ALOT OF MOISTURE AND CONDENSATION CAUSING THE PLYWOOD TO BECOME DAMP AND WARP. EVEN THOUGH IT SOUNDS LIKE U HAVE PLENTY OF VENTILATION. I WOULD CHECK THE HEAT RUNS AND MAKE SURE THEY ARE INSULATED WELL ALONG WITH THE TRUNK LINE.
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Old 06-05-2012, 01:26 PM   #10
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Re: Plywood Buckle


Plywood, D/F or yellow pine? Yellow pine will curl up if you spit on it.
May also be no gaps left for expansion/contraction.
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Old 06-05-2012, 08:52 PM   #11
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Re: Plywood Buckle


Hmmm, I don't know. How can you tell which it is?
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Old 06-06-2012, 06:21 AM   #12
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Re: Plywood Buckle


Look for the stamp on one of the sheets. The color tone of the wood, and most three ply is yellow pine, most 5 ply is doug fir.

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