I have a hallway in which I have placed slate tile,these are square or rectangular, and are up to 12 inches in size. they are about 3/16 inch thick. I have a bunch left. At the end of the hallway is a door leading outside, and immediately outside the door is a concrete step, about 2 feet by 4 feet. I think it would look good to cover that with the remaining slate, it would carry the continuity through. Is there any problems that you know of in using this type and size of slate outside? Will it crack in inclement weather? How should I apply it to the concrete? Any help would be appreciated. Thanks.

Dave C