Outdoor porcelain tiles are strong and hard-wearing. This is not the porcelain used in brittle and fragile crockery, no, this is porcelain that is fired in a kiln at over 1200 degrees Celsius. It’s non-porous which means it doesn’t absob water and so it resists cracking from the freeze and thaw process. Also being water resistant means it won’t get soaked and crumble.