Flagstone is a hard, flat stone, cut or split that is popular for patio floors because of its distinctive, natural look. Typical colors are red, blue and buff. Flagstone is extremely durable and can last for centuries. Bleach and water will remove most stains, but grease or rust stains call for harsher chemicals. Since flagstone is laid in pieces, it is easy to replace broken or cracked stones without tearing up the whole patio. Flagstone requires little maintenance beyond regular sweeping away of debris that could leave stains or mold on the stone. However, the size and heft of some of the stones makes flagstone somewhat cumbersome to work with. Also, in order for the patio to be level, the depth of the base must be adjusted to accommodate the varying thickness of the stone. Flagstone reflects the sun so that means it can get pretty hot underfoot, and it can get slippery if wet. Still, flagstone handles different climates well and doesn’t expand and contract when the weather changes. Flagstone laid in sand needs regular readjustments to keep it level as it settles, while a flagstone patio set in concrete results in a permanent patio that requires virtually no maintenance.