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TOPIC: Pressure treated plywood

Pressure treated plywood 11 years 2 months ago #81588

  • dspeck
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Anyone know if pressure treated plywood is safe to use for sub-floor stringers and underdeck stiffeners? I would glass it in just as I would if using marine ply.

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Re:Pressure treated plywood 11 years 2 months ago #81591

No, the contaminates that encapsulate pressure treated so it does not rot will effect the lamination stability of fiberglass. It is also wet so it will have a low bond strength right from the get go.. Also PT is usually a CDX grade which is garbage more or less

If you don't want to use Marine grade, get ABX or ACX exterior ply. Good lumberyard will have it

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Re:Pressure treated plywood 11 years 2 months ago #81600

I have used it for my deck years ago with good results but I would never cover it. As stated above under deck is not ideal situation for it. My deck is open and removable so I can inspect my wooden members inside my boat. All my wood is open to the air. It has been properly undercoated and painted. I also have installed a good quality outdoor carpet on it. It is also stored under a roof and does not get wet. Marine grade would work better for your circumstances.

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