I have yet to receive the perfect board, flat and true in all respects - you need to make it that way, so I figure the same is for plywood. As I see it, wood is a natural product and it will respond to temp and humidity. When it is flat (enough) seal it on both sides and it should stay that way. So it does sound like I can make the curve go away. Look at it one day and it is bowed one way, flip it over and the next day it is bowed the other way. What I have noticed is that the top sheet is the real mover. I have seen 3/4" doors on older (50 plus years) cabinets that were dead flat but for some reason the stuff they make today doesn't like to stay flat. If you need flat these days you’re stuck with MDF or similar product. I second Contributor F's response on this one. I monitor the top piece on the stack/stacks and flip it face for face as it changes shape until I put in into whatever assembly it is part of. If I think the air in the shop is moist, I will lay it hollow or concave side up for a while so that the hollow or dry side will take on moisture, begin to swell and then move toward being straight.Īs to the question as a whole, yes, I think you can definitely influence the shape of plywood by the way it is stored and how it is supported, but it is a very slow process and will only be practical if you have the time to store the material for months before you use it.įor me, I see the bow when I get the sheet into the shop and I rip the longest parts from the straightest plywood and I stack the cutout parts on a very flat/straight surface. If I think it is dry in the shop, I will lay the plywood convex side up so that it will start to dry and begin going hollow on that face. The way I deal with it depends on the season or the humidity in my shop. The half inch hollow/bow sounds pretty typical to me. Call the sales rep where you bought it and have it replaced. Has anyone had any success in taking the curve out by laying the ply down supported only by the ends on 2 x 4's with the curve facing up and letting gravity do it's thing? Or am I just wasting my time? (If the board is vertical and a string is put on either end there is a 1/2" space in the center). I have gone through the pile and I noticed some of the plywood is not flat along the 8' length. I have purchased a unit and a half of 3/4" A-1 maple plywood (5 ply + 2 veneer faces, made in Canada).
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