5 Signs Your Roof Needs a Professional Clean

Most people only think about their roof when something's gone wrong — but the early warning signs are usually visible from the ground, well before any real damage sets in. Here are five worth keeping an eye on.

1. Moss and algae patches

Green or dark patches, especially on north-facing or shaded slopes, are usually moss or algae taking hold. Left unchecked, moss holds moisture against the roof surface, which can accelerate wear on tiles and slates over time.

2. Dark streaks or discolouration

Black or grey streaking is often algae rather than dirt, and tends to spread faster than people expect once it's established.

3. Blocked or overflowing gutters

Debris washing down from the roof is a strong sign it's due a clean — and clearing the roof itself usually needs doing alongside the gutters, not instead of them.

4. Debris building up around vents and flashing

Leaves, moss and grit tend to collect around any roof penetration — vents, flashing, valleys — and can affect how well those areas shed water if left to build up.

5. It's simply been a while

If you can't remember the last time your roof was cleaned, that's usually answer enough. A clean roof isn't just about appearance — it's one of the more cost-effective ways to protect a roof's condition between full inspections.