Wow, its amazing what one can learn from this list. Thats way more than I
thought I wanted to know about plywood, but I'm sure glad somebody asked the
question.
Seems like there is nothing left with the "old world quality" built in. No
wonder even the old craftsman are using plastic composite products instead
of wood these days. Well I'll leave that thought for another list and
another time. Thanks for the info Bob.
Mark
----- Original Message -----
From: Bob Howard <mgbob@juno.com>
To: <shaws@mlcltd.com>
Cc: <mgs@autox.team.net>
Sent: Tuesday, January 16, 2001 3:01 PM
Subject: Re: A floor boards
> Bob,
> Here is a bit more detail on the question about plywood.
> "exterior grade" tells that the glue is more or less waterproof. Many
> of the "interior" plywoods also have this more or less waterproof glue
> also, since kitchen and bath cabinets are subject to moisture and
> humidity. Where "exterior grade" comes up short, though, is that these
> days it may (and usually does) have voids in the inner veneers. Those
> voids on the surface have been cut out and filled with the oval-shaped
> filler pieces that are visible, but that effort has not been expended on
> the interior veneers. When the "exterior" plywood gets wet, moisture
> soaks in and collects in the voids. Then, as it dries, or worse doesn't
> dry and freezes, it tends to break apart the wood fibres around the void.
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