Roof Soft Washing in Round Rock, TX

The black streaks on roofs across Round Rock are not dirt — they're Gloeocapsa magma, a cyanobacteria that feeds on the limestone filler in asphalt shingles. It's airborne and spreads from roof to roof across neighborhoods. It's not a cosmetic issue: Gloeocapsa magma actively degrades shingles by consuming the protective granules that reflect UV radiation and protect the asphalt layer. Left untreated for 5–10 years, it can measurably shorten shingle lifespan.

Roof soft washing is the correct — and manufacturer-approved — method for removing Gloeocapsa magma and other biological growth from asphalt shingles. We apply a professional-grade soft wash solution at low pressure, allow dwell time for the solution to kill the organism, then rinse at low pressure. No walking on the roof with high-pressure equipment. No lifted shingles. No granule loss from mechanical pressure. The result is a clean roof that stays clean for 2–3 years because the organism is killed at the root.

Gloeocapsa magma is a photosynthetic cyanobacteria that forms dark-pigmented sheaths to protect itself from UV radiation — the black streaks you see on roofs. It spreads via airborne spores and establishes on roofs that retain moisture. In Round Rock's climate, north-facing roof slopes and areas shaded by trees are most susceptible.

Moss and lichen are separate organisms that also colonize roofs in Round Rock. Moss retains moisture against the shingle surface, accelerating deterioration. Lichen attaches to the shingle surface with root-like structures (rhizines) that penetrate the granule layer. Both require soft washing with appropriate cleaning solutions for effective removal.

The Asphalt Roofing Manufacturers Association (ARMA) recommends low-pressure soft washing with a bleach-based solution as the approved cleaning method for asphalt shingles. High-pressure washing is explicitly not recommended — it removes the granule layer that protects the shingles, voiding manufacturer warranties and accelerating deterioration.

Low-pressure application only — no walking on the roof with high-pressure equipment. ARMA-approved soft wash method. We wet down and rinse all landscaping. We assess moss and lichen attachment depth before quoting — heavily attached lichen may require multiple treatments. Written quotes before any work begins.