Full roof soft-wash — Paisley semi

The problem

• • Heavy moss bedded down on the north pitch, with tufts up to 30mm deep along the lap joints.
• • Black streaking across the south pitch from Gloeocapsa magma.
• • Moss debris filling the gutters with every storm.
• • Sand coating still intact on the tiles underneath the moss — roof had life in it yet.

Our approach

1. 1. Hand-scraped the heaviest moss off the north pitch from the ridge down so debris went into a tarp, not the gutters.
2. 2. Soft-washed the full roof at under 100 psi with a biocide blend, allowing 15 minutes dwell.
3. 3. Low-pressure rinse from ridge to gutter to lift the dead growth.
4. 4. Cleared the gutters afterwards with a ground-based vacuum — included in the price.
5. 5. Final biocide top-up across both pitches to prevent regrowth for 4–6 years.

The outcome

• Original tile colour restored across both pitches.
• Owner saved £3,680 vs the unnecessary re-roof quote.
• No moss debris in gutters at the autumn check 6 months later — biocide working as expected.