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6 min read · Updated 2026-01-15

10 Signs Your Roof Needs Cleaning

Visible moss cushions, black algae streaks, blocked gutters and coloured granules in downpipes are all reliable indicators your roof is overdue a clean. Some signs are cosmetic; others point to functional problems developing.

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  • Updated for 2026

Written by

JW

James Whitmore

Founder & Lead Roof Technician, Nottingham Roof Cleaning

James has spent 12 years cleaning, inspecting and restoring roofs across Nottinghamshire. Formally trained in soft-wash methodology, IPAF-certified for powered access, and a working member of the UK Roof Cleaning Association. He personally inspects the majority of jobs the company quotes.

  • SoftWash UK — Accredited Technician
  • IPAF (Powered Access) — Certified
  • PASMA (Mobile Scaffolds) — Certified
  • Environment Agency — Registered Waste Carrier
  • UKRCA — Member

Visible moss cushions, black algae streaks, blocked gutters and coloured granules in downpipes are all reliable indicators your roof is overdue a clean. Some signs are cosmetic; others point to functional problems developing.

The cosmetic signs most homeowners spot

These are the obvious indicators — the ones your neighbours notice too:

  • Visible green moss cushions on the roof slope
  • Black gloeocapsa streaks running down from the ridge
  • Colour change on the north-facing slope
  • Green staining on rendered gable walls below the roof
  • General 'tired' appearance compared to neighbouring roofs

The functional signs to take more seriously

These indicate the roof is starting to work less effectively:

  • Granules from tile coating collecting in gutters and downpipes
  • Blocked or overflowing gutters after moderate rainfall
  • Damp patches on chimney brickwork
  • Loose ridge tiles or visibly cracked mortar
  • Water marks appearing on interior ceilings near external walls

When to act

Cosmetic signs alone are worth addressing on a 4–6 year rhythm. Any functional sign warrants a survey now — not because catastrophic failure is imminent, but because early intervention is dramatically cheaper than reactive repair.

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If you'd like a fixed-price quote for your Nottingham property, request a free roof inspection using the form on this page — we'll typically respond within one working day. Every quote is written, fully insured and includes gutter clearance as standard.

Technically reviewed

Sarah Alden MCIOB — Chartered Construction Manager — independent technical reviewer. Sarah is a Chartered member of the Chartered Institute of Building with 18 years in domestic roofing surveys. She independently reviews the technical accuracy of published content on this site.

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Frequently asked questions

How much does the work discussed in this guide typically cost in Nottingham?
For most Nottingham properties, a full soft wash with moss removal and biocide falls between £400 and £950. Biocide-only treatments start around £250. Restoration work with re-colouring is a separate service and starts around £1,600. We provide fixed written pricing after a free inspection.
What treatment schedule keeps moss under control in Nottinghamshire?
A full clean every 3–5 years is standard. Roofs under tree cover, on north-facing slopes, or in the wetter west of the county often benefit from a biocide top-up at 24 months to hold results between full cleans.
Should I choose soft wash or pressure washing?
Soft wash. Pressure washing damages the tile surface, voids many manufacturer warranties, and forces water into places it doesn't belong. Soft wash is slower but preserves roof life and delivers longer-lasting cleanliness — the only method we use on domestic tile and slate.
How long will results last on my Nottingham roof?
Expect 3–5 years of visibly clean tiles and up to 5–7 years of heavy-moss control with a mid-cycle biocide top-up. Regular gutter clearance and trimming overhanging branches extend results further.
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