Roof Cleaning in St. Augustine, FL

Roof Cleaning in St. Augustine

St. Augustine's combination of Matanzas River salt air, Atlantic humidity, and over 52 inches of annual rainfall creates some of the harshest exterior maintenance conditions in Northeast Florida. Pavers in Anastasia Island and Davis Shores neighborhoods typically need resealing every 18–24 months rather than the standard 3-year cycle because the coastal environment breaks down sealer faster. Roofs in the historic district and the older neighborhoods west of US-1 accumulate Gloeocapsa magma algae quickly — shaded surfaces see visible black streaks within two years of the last cleaning. St. Johns County's Florida Building Code requirements fall under wind zone Risk Category II, which means exterior surfaces here are designed for and regularly exposed to conditions that accelerate wear.

Those black streaks spreading across Florida roofs aren't dirt or mold — they're Gloeocapsa magma, a hardy algae that feeds on the limestone filler in asphalt shingles and gradually degrades the granule coating that protects them from UV. Pressure washing removes it temporarily but damages shingles and voids most manufacturer warranties. EGA Pressure Washing uses a soft wash system that kills the algae chemically at the root, then rinses gently — safe for shingles, safe for the surrounding landscaping, and effective for 1–2 years before retreatment.

The soft wash process uses a low-pressure application of sodium hypochlorite-based solution to kill algae, mold, and mildew at the root rather than blasting them off the surface. This matters because high-pressure washing removes the granules from asphalt shingles — the protective layer that blocks UV from degrading the underlying mat. Asphalt shingle manufacturers including GAF, Owens Corning, and CertainTeed explicitly state in their warranty documentation that pressure washing voids the warranty.

Florida's climate creates near-ideal conditions for Gloeocapsa magma growth: warm temperatures, high humidity, and consistent afternoon rain throughout the summer. On the coast, salt air adds another accelerant. Most roofs in Northeast Florida that haven't been cleaned show visible streaking within 5–7 years of installation.

Beyond the visual effect, algae growth matters structurally. The organisms retain moisture against the shingle surface, accelerating the granule loss that shortens shingle lifespan. Regular cleaning extends roof life and keeps maintenance costs down over time.

Tile and metal roofs need a softer touch than asphalt — we adjust both the solution concentration and rinse pressure for each surface type. For tile roofs, we take care around the mortar cap at ridges and hips, which is a common damage point when cleaning is done too aggressively.

We pre-wet all surrounding landscaping before applying cleaning solution and rinse it again after. Roof runoff with cleaning solution can harm plants if not managed correctly, and we treat it as a standard part of every job rather than an afterthought.

Roof Cleaning in St. Augustine — FAQ