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Forum topic by Wayno1 posted 07-13-2014 02:56 PM 759 views 0 times favorited 4 replies Add to Favorites Watch
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12 posts in 1387 days

07-13-2014 02:56 PM

Topic tags/keywords: moisture wood help kiln dried

Hi all, great place ya’ll have here. With that being said, I searched the forum and found quiet a bit of info regarding moisture issues with self milled lumber. I am dealing with brutal humidity levels in central Ms. It’s so bad you can almost see the water in the air…lol. 3 weeks ago I milled pieces of kiln dried sapele and jatoba to 1/2×12x12. Both pieces were perfectly flat as expected. Hand rubbed poly on both and let them sit flat after drying. Yesterday the sapele had cupped more than I cared to measure and the jatoba had a little movement. Should I plane in several steps waiting a period of time between? Any help or guidance would be greatly appreciated.

4 replies so far

View mahdee's profile


3870 posts in 1732 days

#1 posted 07-13-2014 04:35 PM

I wouldn’t. I live in Ar and know what you mean about humidity. Thinking about moving around will make you sweat. Depending on what you are going to use the wood for, if it is going to be secured to a thicker flat piece, it should work the cup out.. It was probably the combination of heat from the saw blade and the poly that caused it.


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2828 posts in 3249 days

#2 posted 07-13-2014 05:03 PM


You may be able to get away with simply flipping the pieces over and see what happens.

Sounds like the moisture is releasing from one side and maybe trapped by laying flat on the other side.

I surfaced a couple of pieces of Birdseye Maple on day and when I came back the next day they looked like a pair of rockers to a rocking chair. Thought I ruined two beautiful pieces of wood. Not knowing what else to do, I flipped them over and when I came the next day, they had actually cupped the other way (but not as bad).

So I flipped them again and the next day they cupped back the other way but less than originally, so I continued to flip for 3 or 4 more times and they finally flatten out by themselves. I used those pieces to make two book covers and after 20 years, they are still flat.

Not saying it will work every time, but sometimes its just a matter of getting the moisture to release equally from both sides of the wood.

If your wood is laying flat on another surface than moisture can only release from one side and that can cause a problem.

Good luck.

-- John @

View lateralus819's profile


2241 posts in 1854 days

#3 posted 07-13-2014 05:10 PM

I’ve had it happen like that. I made a two piece box lid out of yellow heart. Needed to do an inlay but wanted to wait a bit to see what the wood did first. It cupped 1/4 inch. Flipped it and it went flat. Did it twice before it stabilized.

View Wayno1's profile


12 posts in 1387 days

#4 posted 07-13-2014 11:49 PM

I am going to try the flip and plane method, thanks for the idea. It makes a lot of sense.

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