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Unread 04-19-2021, 03:14 PM   #1
sd6000
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Plywood C grade or better

Based off previous projects and advice from this forum, I have been adding a layer of 1/2 plywood over my existing subfloor. I know the rule of "c grade or better on both sides" for the plywood.
With the current lumber pricing nonsense, ACX, BCX and, CCX are all pushing $70 a sheet. I have a source of Baltic birch in 4x8 sheets for under $50. Is there any reason to not use Baltic birch and save $20 a sheet?...


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Unread 04-19-2021, 03:33 PM   #2
jadnashua
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You want an exterior rated glue, which may not be in the birch ply. It may work...don't know for sure.
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Unread 04-19-2021, 03:37 PM   #3
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I've had BB outside and it delaminated, which I assume means it wasn't exterior glue. I don't know if any of it is. Being it's doesn't carry USA grade stamps, I don't know how to tell.

Not worth saving the dough, IMHO, even though I get it with lumber pricing.
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Unread 04-19-2021, 05:33 PM   #4
sd6000
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Good point, I forgot to think about the exterior glue rating.

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Unread 04-19-2021, 09:18 PM   #5
jadnashua
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They do make marine grade birch plywood, but that stuff tends to be expensive. It's nice and stable for furniture though in its normal form. I like to use it to make drawers, with a finished hardwood on an overlay in front.
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