Conway roofs grow a different problem than the beach does
Drive the ten miles from the oceanfront to Conway and the roof staining changes character. On the beach the black streaks are the whole story, algae fed by salt and ocean humidity. In Conway the same algae is there, but it competes with something the coast barely sees: moss. The Waccamaw River bottom air stays damp in a way the beach air does not, and the live oaks that canopy so many Conway streets keep the north-facing slope of a roof in shade for most of the day. Moss needs exactly that, steady shade and steady damp, and it is why a Conway roof can be carrying thick green mats on the shaded pitch while the sunny side only shows the usual dark streaking. Knowing which growth you are looking at matters, because they are not removed the same way and they do not cost the same to treat.
Why the river-bottom humidity is the real driver here
Conway sits inland on the blackwater Waccamaw, and the river bottom holds moisture in the air long after the rest of Horry County has dried out. A roof here does not get the salt film a beach roof does, but it stays damp longer, and damp is the one thing every roof growth needs to take hold. The algae that streaks shingles feeds on the limestone filler in the asphalt and travels downslope with rainwater; the moss that mats the shaded slope roots into the seam between shingles and lifts the edges as it thickens. Both are fed by the same river-bottom dampness, which is why a Conway roof that is never cleaned will usually show both at once, streaking on the open slopes and moss in the shade. That combination is what makes a Conway roof cleaning a slightly different job than the same service on the oceanfront.
Soft washing is the only method that belongs on a shingle roof
Asphalt shingle is armored with a layer of ceramic granules that are the roof's sunscreen and its fire rating, and they are held on by nothing more than the asphalt they were pressed into. A pressure washer clears streaking by stripping the top of the shingle along with it, which is why a pressure-damaged roof shows a wand pattern you can read from the yard for the rest of its life. We never run pressure on a roof. We apply a low-pressure solution, closer to the force of a garden hose, that kills the algae and moss at the root, let it dwell long enough to work, and rinse gently. The moss mats are cleared with a soft rinse and patience, never a scraper or a wand that would tear off granules or pry up a shingle. Every major shingle manufacturer and the asphalt roofing trade body agree that pressure on shingle is the wrong tool, and running a wand across the slope is a fast way to void whatever warranty coverage the roof still carries.
Moss is the Conway-specific job, and it costs more than streaks
If your Conway roof sits under live oaks or backs onto the river bottom, moss is the growth to watch. It is a dense, spongy plant that anchors its rhizoids into the seam between shingles, lifts the edges as it thickens, and traps moisture against the roof underneath. Killing it takes a treatment and dwell time, and clearing the dead mats has to be done gently, which is why a moss treatment runs higher than a routine streak wash. The good news is that a proper kill keeps a shaded Conway roof clear for a couple of years or more, and trimming back the overhanging branches that keep the slope in shade extends that considerably. If you are being told the roof needs replacing because of the moss, look in the gutters first: granules collecting there, or shingles cupping and lifting at the edges, point to age. Moss alone is not a sign the roof is worn out, and we would rather tell you that than wash a roof that actually needs a roofer.
Historic downtown and the CCU rental ring are two different jobs
Conway's housing stock splits into two very different roof jobs. Around the historic riverfront downtown, the roofs sit on genuinely old houses, some with decades of layered shingle and porch work repainted many times over, and none of it wants pressure. A soft wash is the only safe approach on that older material, and we treat the shaded elevations as the priority rather than washing every slope to the same standard. Around Coastal Carolina University, the demand is different: student rentals and the older homes that ring the campus turn over constantly, and a clean roof is part of keeping a rental presentable and protecting the shingle from the damp that never lets up. Both get the same low-pressure method, but the scheduling and the priorities are not the same, and we scope each Conway roof on what it actually is rather than pricing off a square-foot figure alone.
What a Conway roof cleaning costs and how to book it
Most single-family roof cleaning in the Conway area runs from a few hundred dollars for a small, simple shingle roof to well over a thousand for a large two-story roof with complex angles, with a moss treatment sitting at the top of that range. Roof size, pitch, and how much growth has built up are the biggest factors. We give a firm, flat quote after a quick look, and we pair roof cleaning with a house wash when the whole exterior needs it, which often earns a better combined rate and means the roofline and the siding match. Call (843) 351-9755 or send a few photos through the form here, and you will get one upfront price for the Conway job with nothing owed either way.
