Is Roof Cleaning Worth It in Brunswick, GA? The Honest Answer and What the Job Includes

Those dark streaks running down the slope are not dirt, soot or mold. They are Gloeocapsa magma — a blue-green algae that feeds on the limestone filler used as a binder in most asphalt shingles. The dark color is pigment, produced to shield the algae from UV. It spreads roof to roof on the wind and by birds, which is why one streaked roof on a street tends to become several.

Brunswick gives it close to ideal conditions. Humidity sits above 70 percent most of the year, and the area takes roughly fifty inches of rain. Winters here are too mild to knock growth back the way a hard freeze does farther north. The town sits low in the marsh with flat drainage, so water that lands on a roof or in a gutter stays wet longer than it would on higher, open ground.

Then there is the canopy. Live oaks, Spanish moss, palms and pines keep north- and east-facing slopes damp for days after a rain — and those are the slopes that show streaking first. A roof under heavy tree cover along Frederica Road, in Sea Palms, or on the wooded north end of St. Simons Island near Fort Frederica and Cannon's Point rarely dries out fully on the shaded side. The same pattern holds inland: the shaded lots around Sterling and the tree-lined streets of Old Town Brunswick see it too.

Metal and tile roofs are not exempt, either. They streak too, and they grow moss in the valleys and around vents and pipe boots, wherever debris collects and holds water.

The part that surprises most homeowners is the timeline. A roof here can show visible streaking within three to five years of installation — well inside the shingle's rated life. That is a maintenance condition. It does not mean the roof has failed.

We will not put high pressure on a roof. Not on a low setting. Not just on the bad spots.

On asphalt shingle, pressure strips the protective granules right off the surface. Those granules are what shields the asphalt from UV — and once they are in the gutter, they do not go back. Shingle manufacturers publish their own care guidance on this; the Asphalt Roofing Manufacturers Association's technical bulletins are worth reading straight from the industry that makes the product, since high-pressure cleaning can affect warranty coverage.

Tile is never pressure washed, either. It cracks, and water gets into the underlayment beneath it — the actual waterproofing layer. Metal gets the same soft wash approach as shingle, just with a different dwell time and solution strength.

Soft washing does the work with a cleaning solution and low pressure. The solution goes on first so the algae is killed at the root — which is why a soft wash holds longer than a water-only spray that knocks the visible growth off and leaves the organism behind to grow right back. Dwell time does what pressure would otherwise be asked to do, and it does not take granules with it.

For more on the difference between methods, see soft washing vs. pressure washing.

We do not publish prices, and we will not quote a roof from a description over the phone. Here is what actually moves the number, so you can read your own roof before you call.

Size is the obvious one. But pitch and story count matter just as much: a steep two-story slope is a different job from a low ranch roof, and tree cover changes how the crew sets up and how much debris sits on the surface before the solution even goes on.

Material matters, too. Tile takes more care and cannot be pressure washed; shingle and metal each call for their own solution strength and dwell time. How heavy the growth is matters, as well — a roof with light streaking on one slope is not the same job as one carrying moss in the valleys and lichen around the vents. Staining is its own factor — rust from a chimney chase cover, for example, does not respond to a general roof solution.

Bundling helps. Putting the roof, house, gutters, windows and driveway into one visit is the norm around here, and it costs less than booking each as a separate trip. Each of those is still its own job. They just share a day.

The quote is free and written, given after we have walked the property. There is no charge for the visit. You get one number for the whole job, and it does not change once we start — unless we find something we could not see, and then you approve it before we go further.

A freshly rinsed roof photographs darker than it dries. The true color shows up a day or so later, once the water is out of the surface.

The bigger reason to wait is biological. A soft washed roof keeps shedding dead moss and lichen over the following weeks, as rain and wind carry it off. The three-week-later roof is the real result. What you see from the driveway as the truck pulls out is still shedding.

This is not a one-time fix, and we will not tell you it is. Brunswick has no winter freeze to reset algae growth, and the humidity that fed the first bloom is still there. The two-to-three-year rhythm keeps the buildup from compounding.