Slate Roof Cleaning

What This Service Involves

Slate is one of the longest-lasting roofing materials, but Northwest lichen and moss can still take hold in its textured surface and joints. Slate tiles are brittle and can shatter under careless footsteps or high-pressure spray. Our crews use soft wash methods and distribute weight carefully to protect both the slate and the copper or steel fasteners beneath. The cleaning renews the roof's rich appearance while safeguarding a material meant to last generations.

Benefits

Removes lichen and algae without chipping or cracking slate; Protects historic and high-value roofing investments; Preserves the natural stone coloring and texture; Avoids damage to fasteners and flashing details

Our Process

1) Inspect slate tiles for cracks, slips, and lichen colonies; 2) Set up weight-distributing access and protect surroundings; 3) Apply a stone-safe cleaning solution to affected areas; 4) Rinse carefully and remove loosened lichen and debris

What Affects the Cost

Age and brittleness of the slate tiles; Extent of lichen and moss establishment; Roof complexity, pitch, and access challenges; Overall slate roof square footage; Care required to protect period fasteners and flashing

Best Time of Year

Dry summer conditions provide the stable, low-risk footing needed for safe slate cleaning.