Roof Cleaning

The problem

Moss and algae hold moisture against your roofing material. That accelerates wear, and moss in particular works its way under shingle edges and lifts them. A roof is one of the most expensive things on a house to replace, and the growth sitting on it right now is actively shortening its life.

Why pressure washing is the wrong tool here

Asphalt shingles are coated with protective granules that shield the material underneath from UV. High pressure strips those granules, which shortens the roof's life instead of extending it — and it's typically what voids a manufacturer's warranty. Tile cracks under direct pressure and careless foot traffic. Neither surface should ever see a pressure wand.

How we clean it

Low-pressure application of a roof-safe cleaning solution that kills growth at the root, an appropriate dwell time, then a gentle rinse. No scrubbing, no blasting. On tile we walk deliberately and only where weight can safely go.

Signs it's time

Dark streaking down the roof plane, visible green in the valleys where two planes meet, moss clumps along shingle edges, or a general dark tint on north-facing sections. On the Peninsula these show up first on shaded roof faces and anywhere under overhanging branches.

Debris matters as much as growth

Leaf litter and needles in valleys and behind chimneys hold water and feed moss. We clear that as part of the job, and we'll tell you if we see anything — lifted flashing, damaged tile, sagging gutter line — that you'd want a roofer to look at.