Roof Cleaning in Fort Gratiot Township

The streaks are algae, most often Gloeocapsa magma; the popular idea that it feeds on the limestone filler in asphalt shingles is still debated. Here it starts on the slope that faces the trees. Along the Black River the soil survey maps rough broken land, steep bluffs that are pastured, forested, or idle and covered with brush. Where a bluff is forested, or a woodlot stands beside the house, the trees shade one side of the roof. That side holds dew into the late morning, the streaks widen across it each year, and moss can follow where branches hang low over the shingles and drop needles and leaves on them.

Age is the second factor. The 1990s were the township's biggest building decade, with 996 homes built between 1990 and 1999, and a house from that decade still on its first roof has shingles about 27 to 36 years old. A shingle that age has already lost some of its granules, and the streaks hold moisture against what is left, so the roof dries more slowly every season. That is why the shingles are checked before any solution goes on. If tabs are curling or cracked, or the gutters are full of granules, you hear that before treatment, since cleaning a roof near its end makes little sense.

The treatment uses the same chemistry as soft washing, applied gently from the roof edge and ladders and left to work. Most streaks fade over the following days and wash away in later rains. Roofs near Lake Huron along Lakeshore Rd see the same growth on whichever slope the sun reaches last. The drive of about 50 minutes up I-⁠94 from our Clinton Township shop carries no travel fee, and the written quote follows within 24 hours. Our guide to black streaks on a roof covers what the growth does to shingles over time.

What Pressure Takes Off a 1990s Shingle

High pressure on asphalt shingles knocks loose the granules that shield them from the sun. The roof looks clean for a season, then ages faster, and on a first roof from the 1990s that loss can bring replacement closer. Scraping moss tears the tabs it grips. Walking a wet, treated roof is a fall hazard. Sodium hypochlorite must not be mixed with acids or ammonia, which release toxic gas, so the roof solution goes on by itself.

When to Book Roof Cleaning in Fort Gratiot Township

Roof treatment works best in mild, dry weather from late spring through early fall, when the solution can dwell without rain rinsing it early. Here, the gap after the spring pollen drops and before the woodlots shed their leaves keeps the gutters clear for the runoff. Streaks keep fading for days after treatment, and the full result shows after a few rains. A dry forecast for the next day is ideal.