I have grilled with maple planks a couple times, and both times they curled a bit (center about half-inch higher than edges).
I think i did everything right... 2hrs (at least) soaking, 350-400F... curling happened after just about 5mins. Not a huge problem, but it sortof screwed up the presentation and made things a bit harder to manipulate.
Anyone else see this?
These were "Fire and Ice" brand maple planks, 3/8" x 6" x 15".
Good news is that my brazilian style shrimp and scallop dish was still very very good.