A Muskoka Granite Rock staircase constructed at a cottage on Lake Rosseau allows the client to safely and quickly get down from the main cottage to the waterfront. All of the stair treads used in any set of stairs constructed by Coulson Bros. are custom calibrated to exact heights. Not only are they 100% flat, they are consisted from stair to stair for maximum safety. This consistency in tread height allows our clients to simply walk without having to wonder how high the next tread is or if is flat.