Moss, algae, and black streaks on High Country roofs aren't cosmetic — they're active damage. We soft-wash and seal to stop the growth and extend your roof's life.
Get a QuoteBanner Elk, Boone, and Beech Mountain get more annual rainfall and cloud cover than most of North Carolina. That persistent moisture — combined with heavy tree canopy — creates ideal growing conditions for moss, lichen, and Gloeocapsa magma, the cyanobacteria responsible for the dark black streaks you see on asphalt shingles. In the High Country, if you haven't cleaned your roof in three to five years, you almost certainly have some level of biological growth happening whether or not you can see it from the ground.
This matters because moss and algae aren't just ugly — they accelerate shingle degradation. Moss roots work into the spaces between shingles and lift them. Algae eats the limestone filler in asphalt shingles. Left alone for years, this shortens your roof's service life and can void manufacturer warranties. A cleaning every two to three years is significantly cheaper than a premature reroof.
We use soft washing — low-pressure application of a biodegradable cleaning solution — not high-pressure washing, which damages shingles. The solution kills biological growth at the root rather than just blasting it off the surface. For most roofs, the result is clean shingles and a treatment that keeps growth from returning for 18–36 months.
After cleaning, we offer roof sealing — a clear protective coating that adds another layer of resistance against moisture intrusion, UV exposure, and biological regrowth. It's particularly worth it on older roofs with 5–10 years of life remaining — it stretches that timeline.
Ready to schedule? Get a quote →Banner Elk, Boone, Beech Mountain, Newland, Seven Devils, Sugar Mountain, Valle Crucis, and surrounding Avery and Watauga County communities. We work on primary homes, vacation cabins, and investment rental properties.
Most residential roofs run $250–$550 depending on pitch, square footage, and degree of biological growth. A standard 1,500 sq ft ranch roof is typically $250–$350. Steeper pitches or heavy moss coverage increases the price. We give you a flat number before we start.
Every 2–3 years is the typical recommendation for homes with tree cover in this climate. Roofs in full sun on open lots can go longer. If you're seeing visible black streaks or green tinting on the shingles, it's overdue — the damage is already underway.
Yes — and it's the only safe method. High-pressure washing forces water under shingles, dislodges granules, and can damage the decking underneath. Soft washing uses low pressure (comparable to a garden hose) with a chemical solution that kills the organisms. It's the method recommended by asphalt shingle manufacturers including GAF and Owens Corning.
Yes, measurably. Algae and moss accelerate shingle deterioration by 20–40% according to roofing industry studies. A roof that would naturally last 25 years under ideal conditions might need replacement at 15–18 years with persistent biological buildup. Cleaning every few years is a straightforward return on investment.
No. We need access to the exterior of the property and an outdoor water spigot. As long as pets and children are clear of the work area during application, you don't need to be on site. We'll let you know when we're done and what we found.
Describe what you're seeing — moss, black streaks, algae. We'll give you a flat quote, usually within 24 hours.