Dark streaks, moss and algae make a roof look older than it is, and moss can hold moisture against the roof. Cleaning helps, but the wrong method can do more damage than the dirt.
Not sure what shape your roof is in?
Free inspection scheduled within 24 hours. Free, with photos you keep.
First, check the roof
Before cleaning, look for cracked or loose tiles, missing shingles and damaged flashing. Cleaning a damaged roof can make leaks worse, and water can get in where tiles are broken.
Never pressure wash shingles
High-pressure water strips the granules off asphalt shingles, which shortens their life and can void the warranty. It can also force water under the shingles. On tile, high pressure can crack tiles and blast away the surface coating.
Cleaning asphalt shingles
The dark streaks on many North Texas roofs are algae, usually on shaded north-facing slopes.
Some algae stains fade over several rains after treatment rather than all at once.
Cleaning clay and concrete tile
Keeping it clean
Safety
Wet roofs are slippery, tile breaks under the wrong footstep, and cleaners make surfaces slicker. If you are not comfortable on a roof, hire someone who works on roofs every day.
If cleaning uncovers damaged tiles, lifted shingles or worn flashing, call (855) 741-ROOF for a free inspection.