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Old 09-15-2010, 11:26 PM   #1
hjd
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Porch Ceiling


Hello all

I've got a porch ceiling that was originally covered with 3/8" plywood and trimmed with some molding along the seams. I think it was a lower grade since there were 'football' shapes that always showed through the paint. Decided to attempt to fix it and went and purchased some oak veneered plywood at the HD.

Did a nice job...tight joints, new molding that was straight as an arrow down the seams, porch is about 10' by 60'. Used heavy duty liquid nails and galvanized finishing nails to nail through the existing plywood and into the trusses that support the roof above. Got it all done, caulked and painted and started wondering. Did I select the wrong material for an exterior application? I am now concerned about lamination durability and warping. Did I make a huge mistake and if so any solutions? Thank you very much.

John

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Old 09-16-2010, 07:27 AM   #2
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Porch Ceiling


If it was stamped exterior glue on the rough side, it should be OK. Often oak, birch, etc., plywood is not exterior glue, but if it is painted, it may be OK. It is already up and finished, so I wouldn't start worrying now.

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Old 09-16-2010, 08:38 AM   #3
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The "footballs" are what the mill uses to fill knot holes, and structurally, or otherwise, there is nothing wrong with them. However, since you did not like their appearance, and do like what you have now, as Bill said, don't worry about it.
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Old 09-16-2010, 10:29 AM   #4
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Thank you for your responses. I suppose worrying now isn't going to do much good but it is hard not to. If it matters it was primed with Zinnser 123 and painted with 2 coats of Kelly Moore Exterior Paint. Oh and no it wasn't marked exterior. I guess time will tell. Any other comments greatly appreciated, if not I will try to put it to bed.

John
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Old 09-16-2010, 01:36 PM   #5
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Porch Ceiling


Too many unknowns here. Location (climate) would help, for one thing.
Open porch, exposed to temperature and humidity changes?
"tight joints"? Does that mean you left no room for expansion? Could be a problem down the road, especially if your area is humid.
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Old 09-16-2010, 01:48 PM   #6
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All valid points to keep in mind for subsequent projects, but since it's glued and nailed, again, don't worry about it. A good learning project.
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Old 09-16-2010, 05:19 PM   #7
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The back label "exterior" is not for glue, but location: http://www.tpub.com/content/construc...s/14043_75.htm

Gary

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