* Low slope roofs have less than 4 rise per 12 of run; high slope roofs have more than 4 of rise per 12 of run. Simple roof shapes have 6 or fewer distinct roof planes; common roof shapes have between 6 and 12 roof planes and complex roof shapes have 12+ roof planes. Asphalt Shingle Roof cost estimates may require an onsite inspection. Usually these estimates will be free.