Clients often ask us about whether their shingle and tile roofs should be sealed.

The black streaking and patches that can be seen on a roof are the result of an algae that continues to grow and spread over time.

High-pressure washing involves hitting a surface with water that is pressurized at 1000 pounds per square inch (PSI) up to greater than 3000 PSI. Blasting away at any surface without care using such high pressures can cause significant damage to a roof, exterior, or even a concrete surface.