Roof Cleaning in East China Township

Dark streaks on an East China roof are algae colonies, most often Gloeocapsa magma, a species widely described as feeding on the limestone filler in asphalt shingles. Rain carries the cells down the slope, so the marks start near the top and widen each year, and the colony keeps the shingle surface wet after each storm. Moss is a plant and needs more water. It takes hold under the lower edges of the tabs, lifts them and keeps the mat beneath them damp. On a roof beside the floodplain woods that can mean a slope that stays damp most mornings from spring to fall.

The township gives both plenty of water. Woodlands are numerous across East China, with wetlands along the Belle River and Pine River floodplains, so a lot backed by woods along the Belle River floodplain can have one slope in shade much of the day. On the river lots east of M-⁠29 and the canal plats along Kraft Haven Canal and Baker Canal, open water close by keeps the air moist, so dew sits on the shingles longer after a cool night. The slope that stays wet longest streaks first, which is why one side of a roof can be black while the other looks clean.

About 55% of the township's homes went up between 1970 and 1999, so many roofs here are older shingles carrying years of growth, or newer replacements worth protecting before streaks set in. Both get the same treatment. A no-pressure solution goes on and kills algae and moss where they grow, and the following weeks of rain wash the dead material off the slope. Thick moss is lifted by hand only where it comes away easily, so the tab edges under it stay intact. A treatment costs from $450 and holds three to five years on most roofs before the slope needs another.

Knocked-Off Granules and Wet Roof Decks

Pressure on an asphalt roof knocks off the mineral granules that shield the shingle from sunlight, and a bare shingle wears out years early. On the many East China roofs from the 1970s to the 1990s, older tabs are brittle, so walking a wet, mossy slope cracks them, and a stream pushed under the laps soaks the roof deck. A hard rinse also flushes the solution off the eaves before it has worked, toward a canal or the river on a waterfront lot. Retrofitting zinc or copper strips is not something asphalt roofing guidance recommends either.

When to Book Roof Cleaning in East China Township

Treat in spring, once nights stay above freezing, and summer rain has months to rinse the dead growth off slopes shaded by the floodplain woods. Pick a day with no rain in the forecast for several hours, so the solution works before anything dilutes it. Fall works until the first hard freeze, and on a wooded lot it fits best after the leaves are down and the troughs below the slope have been cleared.