Bricks to raise charcoal in kettle

[DWCowles]

They will do but next time you're around a hardware store you may want to pick up some fire bricks.

[_John_]

Those are made for being outside and around fire, so there shouldn't be any chemicals that can cause problems. Though it isn't common, it is possible for a cold, wet brick to explode when taken to high heat quickly. This isn't a grenade explosion, more like a larger version of pouring water over ice and it cracks.

[LSUBBQFan]

I'm ready to try using bricks in my 22" weber kettle to achieve the high heat sear in the rear on steaks. Disappointed that I didn't have any laying around I picked up a few at Home Depot.

I'm curious though -- are any bricks okay to cook with? Or do some contain dyes or other materials that you wouldn't want in your food? The ones I bought are called "Rumble Stones" and I think are marketed for landscape primarily. I have no idea what they're made of but would guess a concrete based mixture.

Thanks