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4-ply vs. 5-ply plywood
hi,
we had a city inspector stop the contractor from sheathing a roof because the plywood was 4 plies instead of 5. he says that apa requires 19/32" plywood to be a minimum of 5 plies . i have never heard of this requirement before, and everyone i talked to who works in the state of fl has never heard of this requirement. is his point ligitmate and if so, how is 5-ply better than 4-ply if the overall thickness is the same? wouldn't more joints (between the plies) mean weaker plywood? maybe i'm missing something, so i appreciate any input on this.

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2009-09-07, 08:46 AM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	4-ply vs. 5-ply plywood 4-ply vs. 5-ply plywood hi, we had a city inspector stop the contractor from sheathing a roof because the plywood was 4 plies instead of 5. he says that apa requires 19/32" plywood to be a minimum of 5 plies . i have never heard of this requirement before, and everyone i talked to who works in the state of fl has never heard of this requirement. is his point ligitmate and if so, how is 5-ply better than 4-ply if the overall thickness is the same? wouldn't more joints (between the plies) mean weaker plywood? maybe i'm missing something, so i appreciate any input on this. __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]