Cornerstone has cleaned a wide range of Hawaii’s roofs, both commercial and residential. Hawaii’s roofs consist of mostly asphalt, shingle, metal, wood, aluminum, Brai, Monier tile, and flat roofs. Some of these roofs require a high pressure and some are best cleaned with a low pressure. We have had a machine built especially for low pressure cleaning. So we can be more delicate with your roofs granules or wood. Mostly, we are cleaning mildew and moss, but on occasions, cleaned bird debris and nests. Our workers are trained in Fall Prevention and have Best Management Practices for working on Hawaii’s roofs.