Roof Cleaning in Port Huron

The city's master plan surveys of its planning neighborhoods list roofing among the repairs: degraded roofing in Seaway, and broken shingles in Mansfield and Optimist, blocks built mostly in the 1940s and 1950s. The black streaks on roofs like these are an algae, usually Gloeocapsa magma, which is often said to feed on the limestone filler in asphalt shingles. Its spores travel in the air, it grows while the shingles are wet, and a dark outer coating makes the colonies look black. Moss can follow on a shaded slope and hold water under the tab edges. On a roof that already has cracked or missing tabs, that water reaches the deck sooner.

In Port Huron the streaks track the trees. The master plan finds tall, mature trees across Sherman Woods and along its waterfront, large trees towering over homes in Palmer, and Edison Shores heavily landscaped with large evergreen and deciduous street trees. North slopes under that canopy stay wet after rain and collect leaves in the valleys, and evergreens shade a slope in every season. Ballentine shows the other case: its newer lakefront homes on Conger St and Omar St have few street trees and open sun, while the off-water lots behind them sit under substantial tree cover.

Roof treatment starts at $450 and repeats every three to five years. The solution is the same sodium hypochlorite mix used to soft wash siding, set to a strength for shingles and sprayed from a low-pressure pump, with no pressure wand on the shingles. Heavy moss may take a second application once the first has loosened it. Where tabs are broken, they are noted before treating so you can weigh repair against cleaning. The 45-minute drive up I-⁠94 from Clinton Township adds no travel fee, and our guide to what causes black roof streaks covers the algae in more depth.

Pressure, Scraping and Broken Tabs

High pressure knocks the ceramic-coated granules off asphalt, and an older Port Huron roof may have little granule left to lose. The shingles look clean for a while, then age faster, and the gutters fill with gray grit. In Harrison Pointe, where the master plan counts failing roofs among the deferred repairs on some homes, a wand can tear loose what remains of a cracked tab and drive water under it. Scraping moss off by force lifts tabs the same way. The opposite mistake is a weak mix that fades the streaks and leaves living algae behind.

When to Book Roof Cleaning in Port Huron

Treat the roof between April and late fall, on a frost-free day with no rain due for several hours so the mix can dwell. Under the Palmer and Sherman Woods canopy, fall works well once the leaves are off the slopes, and it pairs with a fall gutter cleaning. Expect three to five years before streaks return. Shaded north slopes under heavy canopy land at the shorter end, so check them from the street each spring.