A gable roof measures 100′ x 40′ with a 4/12 pitch and a 2′ overhang at each end. Slate tiles measure 16″ x 9″ and will have a 10″ exposure. The tiles are installed on each side of the ridge. How many tiles are need (assume no waste)?

A gable roof measures 100′ x 40′ with a 4/12 pitch and a 2′ overhang at each end. Slate tiles measure 16″ x 9″ and will have a 10″ exposure. The tiles are installed on each side of the ridge. How many tiles are need (assume no waste)?