An asphalt roof may weigh between 230 to 430 pounds per hundred square feet, while slate can weigh in between 800 to 1,500 pounds per hundred square feet, depending on the thickness of your tiles.

The cost of slate is $29,400 for the average 2,000-square-foot roof. However, the cost of a roof replacement or installation using slate varies depending on factors like the hardness of the stone ...