Can Firebrick Be Used Outside?

Fire brick is safe to use in a fire pit above ground. Usually, these bricks are fired up to 1400^o C and can endure the impact of fires, so it's a safe construction material to use.

Can firebrick get wet?

if you're talking about insulating bricks, then you don't want them getting wet as they can soak up water. if they heat up faster than a tight pore or dirt will allow steam to escape, they can crack, flake, or even crumble. The freeze/thaw cycle with deteriorate them as well.

Can I use fire bricks outside?

Kiln-fired brick is safe to use in an aboveground fire pit. These bricks are typically fired to 1800ºF and easily withstand the heat of flames. Landscaping brick that's been kiln-fired is safe to use. Brick paver stones should also be safe to use.