I'm not going to question that you experienced this problem, just your
diagnosis of it. :-)

If those were made of solid wood rails and stiles with 1/4" plywood
panels, there is no way on this planet that the 1/4" plywood warped,
causing the rails and stile to warp, as well. It's a simple matter of
reversed cause and effect, here. The rails/stiles, for whatever
reason, warped and pulled the plywood with them.

Wrong
_____________

Now, if you're saying the doors are made only from a rectangle of 1/4"
plywood, then yes, with all that humidity, I can see an unsupported
piece of 1/4" plywood curling up like a ribbon, in no time.

1. I cut a bunch of softwood lumber into uniform pieces - about 3/4" x 1
3/4" - for use as frames for various utility type doors I needed to make for
both my shop and house. I still have a bunch in the shop, all flat as
pancakes.

2. For the shop doors I used hardboard as the panels. None warped.
Humidity in the shop is high in the summer.

3. I used 1/4" (nominal) birch ply for the doors in the house. Made eight
doors. All were nice and flat. Four warped. The humidity in the laundry
is no higher than anywhere else.

4. I used the same 1/4" ply for some smallish (12" x 18" more or less)
sliding doors for a utility cabinet also in the laundry. They just slide in
grooves, grooves were made sloppy wide because I know from past experience
that ply warps and if the grooves are a nice fit the doors will wind up
binding so much they are hard to move. Initially, the butted edges of two
doors were nicely lined up when closed. They no longer are.

5. I just looked in my shop to see if I had any of the ply used for the
warped doors. I found a piece about 12" x 12" (door panels are about 12" x
36"). With one corner and two adjacent sides flat, the opposite corner is
warped by about 3/8". Extend that warp (wind, actually) to 36" and it would
be better than an inch. Here's a photo...
http://mysite.verizon.net/xico/pix/warped_ply.jpg

6. The ply warped, not the frame.


The ply warping by itself is irrelevant.

You said the ply warping, is what pushed the rails and stiles out 2
inches.
I just don't think that is physically possible.

Of course, I assumed you were talking hardwood, but I still don't buy it
with softwood.

But hey, it's not worth arguing about.


--

-MIKE-

"Playing is not something I do at night, it's my function in life"
--Elvin Jones (1927-2004)
--
http://mikedrums.com

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