Brian Gray
Posts: 339
Joined: 2004-01-21
Location: Sandusky, OH
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You are correct about comparing veneering one side to finishing one side....it's like creating a barrier that moisture cannot get through. But this is only one aspect that can lead to a panel warping.
The other is that the adhesive will commonly shrink very slighty as it cures. This will lead to warping unless you treat the other side in the same way. So it's not the 1/32" piece of veneer that is effecting the 3/4" plywood...it's largely the adhesive shrinking.
Your rationale that a piece of plywood should not react this way because there is already veneer on the other side makes perfect sense, but you're forgetting the adhesive. The adhesive shrinking leads to an imbalance.
Also, notice that all commercial plywood is always balanced when it comes to the number of sheets and their thicknesses....it's for these reasons that they do that.
There are some instances where you don't need to veneer both sides, but it's usually safer and not a huge bother to just do both sides.
I would recommend doing a search of this forum for this issue. It comes up a lot, and there's always something new to learn from the posts of various people. Every so often I'll take an hour or so and just browse through the old threads...I have found that this forum and it's archives is probably the best resource for veneering knowledge that I've ever found...internet or books....
By the way, Darryl...if the day ever comes that you need to wipe some of the archives due to storage space, please let us know in advance so we can save them beforehand!!!
Good luck, and keep us updated on your progress!!
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