"Peter Dohm" wrote

Thanks for that. I had considered adding "ping Jim Morgan".

You're welcome. Glad to be of help.

There may me some minor nits to pick in my description of the various factors
and such, but I think it hits the major factors in enough detail to get the
general idea.

Thing is, I don't often deal with the more strange types of plywood, unless they
deal with house construction, or cabinet making.

I have one other plywood trivia ditty that I though might be relatively unknown
to most folks, and might be of interest.

There exists a type of plywood that is strangely bendable, in one direction,
only. The other direction is as strong as normal plywood. You can buy a 4' x
8' sheet, rolled up so that it is 4' tall, in a circle (cylinder, to be more
precise) with a diameter of perhaps 28".

Yep, you heard me right! And that was a roll of plywood with around 1/2"
thickness!

From what I recall, it is made by having the outer plys grain running straight
across the 4' width, and the interior plys perhaps only 5 degrees (or so) off of
that alignment; just enough off to keep the layers bound together.

The application I used it for was for one of those fancy bay window roofs that
have a fairly deep bend in the roof structure, and hips (kinda' like a ridge on
an slope) going to a point at the top of each of the sections, then covered with
copper. I was working for a framing subcontractor at the time, and he turned me
on to this type of plywood; available only from "boutique" plywood distributors.

For those looking for unusual plywood, I suggest you do some looking in your
local yellow pages (hopefully in a relatively large population area) under
plywood, and see if you can find a place that advertises a specialty of stocking
unusual types and grades of plywood. There are more plywood types under the
sun, than you can imagine, and I can imagine a LOT ! g
--
Jim in NC