Lincolnware sheet pan
Is Wearever the same one? The really expensive ones are 16 guage; are the 18 and 19 guage ones equally durable because they are significantly less expensive. I use my cookie sheets a lot (especially for making square pizza for fatherings) and am tired of warping, etc.
I have some Lincolnware, and they warp if a cold item is placed on a hot pan. It happened just tonight as I was oven roasting potato wedges, and I wanted to preheat the pan. They unwarp just as easily once the temperature evens out.
I think the solution is to get the very heaviest gauge possible. That will be my next purchase.