Roof Cleaning in St. Clair Shores
The black streaks on a St. Clair Shores roof are alive. They are an algae that eats the limestone filler in asphalt shingles and grows fastest where the air is damp, which describes most of the city from the canals to the grid. A treatment kills it with no pressure touching the shingles.
Roofs here sit in the same wet air as the siding. The shingle algae that shows as black streaks needs moisture to grow, and Lake St. Clair supplies it three ways: fog that pools over the canals and lingers into the morning, spray and damp air pushed inland on an east wind, and dew that stays on a north slope until the sun is high. A roof on a canal plat off Jefferson Ave streaks years before the same shingles would in Roseville, and the north slopes on the grid streak under the shade of the 60-to-70-year-old trees.
The ranch roofs on the grid are low, which changes what you see. On a two-story house the streaks hide from the street; on a single-story brick ranch between Harper Ave and Jefferson Ave the roof is most of the elevation you look at from the sidewalk, so the streaking shows from the curb and in every listing photo. It is also a roof a homeowner can reach, which is where most of the pressure-washing damage we see comes from. Along the lakeside streets in the Lake Shore Public Schools section, moss takes hold in the same damp north valleys where the algae starts.
Our roof treatment is a soft-wash solution applied at low pressure, allowed to dwell while it kills the algae and lichen at the root, and rinsed gently or left to weather off with the next rains depending on the roof. No pressure touches the shingles, so the granules stay put and the manufacturer's warranty stays intact. The streaks fade over the following weeks as rain carries the dead colonies off, and the roof stays clean three to five years before it needs the treatment again. Pricing starts at $450, and the crew is about 20 minutes from our shop in Clinton Township.
A Roof Treatment Without Pressure
The job starts on the ground: gutters and downspouts checked so the runoff has somewhere to go, beds and the lawn below the eaves pre-wet, and anything on a canal lot that faces the water covered or rinsed. The solution goes on from the ladder or the eave line at low pressure, working in sections so it dwells evenly without drying. Heavy moss is treated and left to release on its own rather than scraped, because scraping takes granules with it. Runoff is caught at the downspouts and rinsed into the lawn, not the canal. A ranch roof takes about two hours, and the streaks disappear over the weeks that follow.
What a Pressure Washer Does to Shingles
A pressure washer on an asphalt roof strips the granules that protect the asphalt from the sun, and a roof that loses them ages years in an afternoon. It also drives water up under the tabs and into the deck. On the low ranch roofs here the temptation is strong because the roof is within reach. The other failure is a rinse-only wash that clears the black for a season and leaves the algae alive in the granule bed, so the streaks return by the next spring. Scraping moss off by hand tears the shingle surface the same way.
Timing It Right
Late spring through early fall is the treatment season, once overnight temperatures stay above freezing so the solution can work. Canal-side roofs are best treated in May before the summer humidity peaks, and a treatment on a lakeside street before a listing photographs far better than a streaked roof. Fall treatments hold through the winter, when nothing grows. A roof that has been treated once needs the next visit in three to five years, sooner on a shaded north slope.
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Roof Cleaning in St. Clair Shores: FAQs
How much is roof cleaning in St. Clair Shores?
From $450 for a single-story ranch, which is the roof most of the grid wears. A rebuilt canal home with a second story and steeper slopes costs more, and a roof with heavy moss adds a treatment step. Gutter cleaning on the same visit is a natural pairing, because the downspouts are checked anyway before the solution goes on.
Will the streaks be gone the day you leave?
Not entirely. The treatment kills the algae on contact, and the dead colonies loosen and wash off with rain and wind over the next few weeks. A lightly streaked roof looks noticeably better the same afternoon, and a heavily streaked north slope on a canal plat can take a month to clear fully. The result then holds three to five years.
Is the solution safe for my landscaping and the canal?
Yes, with the precautions we take: beds and lawn under the eaves are pre-wet and rinsed after, downspouts are caught and directed into the lawn, and on a canal lot the water-facing runoff is kept back from the seawall edge. The solution neutralizes to salt and water within hours. We walk the plantings with you before we start.
Why does my roof streak worse than my brother's in Harrison Township?
Same lake, different exposure. Fog over the canals, shade from a north neighbor, and dew that lingers on a low slope all add wet hours, and the algae grows only while the shingles are damp. A roof on the plats around the Nautical Mile sits in the dampest air in the city. Trimming branches and keeping gutters clear both slow the regrowth.
More in St. Clair Shores
Deeper reading: What Are Those Black Streaks on My Roof? (And Why You Shouldn't Ignore Them) and The Best Time of Year to Power Wash a House in Michigan.
Book Roof Cleaning in St. Clair Shores
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