Material Size: Broadloom material installed as a stair runner has some funky nuances. Broadloom material often comes 12′ or 13’2 wide. Therefore, we do not simply roll out the carpeting to install it on your stairs. Instead, the roll is cut into segments to cover 2-3 steps at a time. There is no visible start and end point noticeable to you, and we work tirelessly to align the pattern. For a straight set of stairs, a 12 or 13’2 x 6 piece is typically required. This will help understand your estimate.