Moss Build-Up — what's actually going on

Thick green growth across north-facing tiles, often shedding into the gutters.

Common causes

North-facing slopes that stay damp for most of the year
Mature tree cover shading the roof
Worn tile glazing letting moss anchor in micro-cracks
Gutters already part-blocked, holding moisture against the eaves

How we fix it

Inspect for tile damage before any cleaning — pressure washing can do real harm
Soft-scrape and biocide treat to clear without damaging glaze
Clear gutters and downpipes of fallen debris at the same time
Recommend a 2–3 year re-treatment cycle where shading is heavy

Moss Build-Up by area

Locally specific notes for moss build-up across the towns and neighbourhoods we cover.

Moss Build-Up in HamptonTW12 Moss Build-Up in RichmondTW9

Our guides on this

Moss on a roof: does it actually matter?

In most cases a light covering of moss on a north facing slope is cosmetic and can be left alone. It becomes a genuine problem when clumps break off and block gutters and valleys, when it holds water against porous tiles through winter frosts, or when it sits on a shallow pitch where water already struggles to run off.

Roof moss removal methods compared: scraping, softwash and jetting

Manual scraping followed by a biocide soft wash is the safest and most durable approach for most tiled roofs. High-pressure jetting clears moss fastest but strips the tile surface, drives water under laps and shortens roof life — we don't recommend it on domestic roofs.

Keeping moss off a roof after it's been cleaned

Nothing prevents moss permanently, but three things measurably slow it: a biocide treatment at the time of cleaning, reducing overhanging shade where practical, and keeping gutters and roof surfaces clear of organic debris. Zinc or copper strips help on some roofs but only on the slope directly below them.