Replies

1. 
   YesMaam27577 | Apr 08, 2009 08:54pm | #1

   1 If you must store them upright, keep them as Vertical as possible. The less of a lean they have, the less the bend will be.

   2 Since they will be leaning, "turn the pile" a few times a week. Don't let them lean to the right all the time -- they need tome to lean to the left. (This is not a political statement!)

   3 Store them leaning for the shortest possible time. Even with turning the stock, weeks in storage means lots of bend.

   4 Try to get even air circulation around each sheet. This will reduce the effect of moisture absorption.

   And if all of the above fails, and you end up with a warped/bent sheet -- sell it on Ebay. I have never been successful in flattening plywood.

   Politics is the antithesis of problem solving.
2. 
   sapwood | Apr 09, 2009 12:08am | #2

   It seems that more rather than less of the plywood that I see is warped to some degree. Sometimes so much that it cannot be used at all, sometimes just a little. I've decided that when its a piece that has to be flat, I simply plan on laminating at least two pieces together in my vacuum press. When I do this, I have the curved faces counter one another. The result is flat and very stable. Yes, it's a pain to have to do this, but I can't think of another viable approach.

1. 
   Shoemaker1 | Apr 09, 2009 02:56am | #3

   Get a better supplier! Look at the veneer cores are they overlapped and squished? and does the warp occur there? If so cheap imports.
   Spend the bucks and Goggle Norcore from Canada.

3. 
   oldusty | Apr 09, 2009 05:14pm | #4

     If this is only recently you have noticed the warping then imo the source of the plywood is suspect .

      If indeed it is China ply , you are doing nothing wrong to cause the warping except cutting it up .

        I simply will not use the poison plywood so warped it is embarrassing to put into any product I build.

          good luck            dusty

4. 
   Cincinnati | Apr 10, 2009 02:22am | #5

   Are you purchasing these at a box store? Is it made overseas?

   Greg

   •••••••

   Exo 35:30-35

1. 
   andybryant | Apr 10, 2009 05:21am | #6

   NO.  I've had bad luck in the past buying from big box stores so now I buy all of my stock from a local family owned lumber yard.  As far as I know all of his suppliers are canadian except for maybe the specialty items and exotic veneers and hardwoods.  I will ask him though if any of his stock comes from China.  Everything else does these days.  Would it make that significant of a difference between China and North American produced plywoods if they are both veneer core?

1. 
   Cincinnati | Apr 10, 2009 10:04pm | #7

   Yes.It has to due with several factors, including the glue they use, whether the lumber is dried, Number of voids, number of plies.I had a post about warped sheet goods several weeks ago. I saw pallets of 44 sheets of 3/4 ply warped almost 4" in the center if an 8 foot length.Greg

   <!---->•••••••

   Exo 35:30-35<!---->

1. 
   oldusty | Apr 11, 2009 12:43am | #8

     Yeah , but the warped plywood had a low price tag on it, I'll bet and too many fall for it , I guess money speaks louder then common sense .

               d