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I'm normally a cabinet maker/woodworker, but a good client asked me to whip up some simple formica table tops.
I picked up the particle board ("industrial" grade) Sunday morning and roughed out the tops - 30" x 54" and 30" x 27". I left them in two stacks in my shop and when I came back Monday night the ones on top of the stacks were pretty noticeably warped. The rest of the tops were still dead flat - just the topmost ones had warped in a convex manner -towards the air I suppose. I took the warped ones and set them up so air can get at both faces now. We'll see if they stabilize and flatten out again in a day or two. Relative humidity in the shop is currently around 68%.
I'm wondering if you all think:
Thanks for any input.
If the stack was like the one in the photo with the straight edge,
That is a high shop humidity, so I would expect to see the center rise as the exposed surface gained moisture, like Mr Puss mentioned.
Turn the top sheet over and wait a day, and it will go the other way. Long term is to get the humidity closer to 40%. Short term is to put a piece of cardboard or 1/4" ply over the top of the stacks overnight.
However, if you have these sit for a few days or weeks(gaining moisture), and then you bring in some nice fresh laminate and stick it on with contact, you may see the core shrink a bit in service, when they get into a drier environment.
It is best to have both materials acclimatize in the shop, in the same area in the shop for a week or so before putting them together. Other good practice would dictate a balanced construction with a backer, and maybe better glue.