Warped lumber - Woodworking Talk - Woodworkers Forum
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post #1 of 4 Old 01-23-2013, 05:57 PM Thread Starter
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Warped lumber

I have a piece of 4/4 x 10 rosewood about 8 feet long. It's been in my lumber rack for months. Somewhere along the line, like a fool, I put a piece of 3/4" plywood under the rosewood. Over time, the ends of the plank drooped and twisted. I noticed this the other day and removed the plywood, and placed some other hardwood planks on top of the rosewood. After a couple weeks, the plank is still warped and twisted as you can see at the arrows in the pics.

So, will this eventually level back out if it's stored flat again? It's pretty dry now in the winter, maybe summer humidity would help? Hoping I didn't waste a nice piece of lumber.
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post #2 of 4 Old 01-23-2013, 07:50 PM
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I have seen many flat boards warp over the years, but have never seen a warped board return to being flat all by itself. You might try using steam and a heavy weight to bring it back. No promises on it ever getting back to being completely flat.

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post #3 of 4 Old 01-23-2013, 07:58 PM
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I've seen bowed boards flatten after placing them in the sun, bow up.
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post #4 of 4 Old 01-23-2013, 10:12 PM
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I couldn't tell for sure from the pictures. Is it just warped across the width, along its length, or is it twisted, or a combination of the above? If it is just warped, even in more than one direction, you might be able to salvage it. The key is to have the concave side (the side shaped like a cave) more moist than the convex side (the side that isn't like a cave). If it is twisted, there probably isn't a clear concave side. You could try keeping the side that was away from the plywood more moist, but I would be surprised if it worked.

That is the easy part, unless it is twisted. What I'm not sure about is how you would stabilize it once it is flattened out. It might work to just to put it back in the rack with stickers, but it may just warp back.

Once you've gotten it as flat as you can and stabilized, if it still isn't flat enough, you'll have to do the rest by planing. The narrower/shorter (depending on how it's warped) the pieces, the less material you will have to remove when planing.
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