Roof Cleaning in Cape Town
Pressure-wash moss, lichen and algae from roof tiles, plus fungicide treatment and gutter clear-out — the essential prep step before any waterproofing or coating job.
Benefits
Mandatory prep step — manufacturer roof-coating warranties (Plascon, Dulux, Earthcote) are void if the substrate isn't professionally cleaned and treated first
Soft-wash and biocide treatment kills moss and lichen at the root, preventing regrowth for 3–5 years versus 6 months for a pressure-wash alone
Local contractors know which Cape Town roofs (Welgemoed oak-shade tile roofs, Bellville flat IBR) need which approach — high-pressure damages tile glaze, low-pressure won't shift heavy lichen on metal
Free site inspections from most listed contractors — no obligation to commit to follow-up coating or waterproofing work
Photo report of pre-clean condition documents existing damage, useful for insurance claims after storm or fire damage
Bundled cleaning + coating quotes typically save 15–25% versus booking the two jobs separately
Our Process
Free on-site assessment — contractor inspects tile/sheet condition, photographs moss/lichen coverage, checks for cracked tiles and rusted ridge caps before cleaning
Roof access setup — proper roof ladder, harness anchor points and sometimes scaffolding for double-storey or steep-pitch homes
Soft-wash treatment for tile roofs (low-pressure detergent + biocide soak) or controlled high-pressure for IBR/metal — the method must match the substrate
Hand-clearance of valleys, ridge caps, gutters and downpipes — heavy debris is bagged, not flushed into the storm drain
Fungicide and biocide application across the cleaned surface to kill spores and slow regrowth
Optional rinse and 24–48 hour drying period before any subsequent coating, painting or waterproofing application
Final photo report with before/after coverage shots plus any flagged tiles, cracked ridges or rusted fixings the contractor recommends addressing
Pricing
From R3,500 (single-storey tile roof, ≤120m²)
Tile soft-wash + biocide: R30–R55/m² depending on moss load and access. IBR or metal pressure clean: R25–R45/m². Bundled clean + roof coating: typically R85–R140/m² combined (saves vs separate quotes). Double-storey homes (Welgemoed, Plattekloof) add 20–30% for scaffolding and harness setup. Always get the cleaning + coating quoted together if you're planning to coat — it's substantially cheaper than booking the two trades separately.
Get Accurate QuoteFrequently Asked Questions
Do I really need to clean my roof before waterproofing or coating?
Yes — and skipping this step is the single biggest reason fresh roof coatings peel within 12–24 months. Coatings need to bond to clean substrate, not to a layer of moss, lichen, algae and oxidised tile glaze. Plascon, Dulux and Earthcote all explicitly require professional cleaning + biocide treatment as a precondition for their product warranties; if you DIY-coat over a dirty roof and it fails, the manufacturer won't pay out. A good contractor will refuse to coat an uncleaned roof for exactly this reason — protect your investment by treating cleaning as non-negotiable.
High-pressure vs soft-wash — what's the difference?
High-pressure cleaning uses 1,500–3,000 PSI water and is appropriate for metal sheeting (IBR, corrugated iron) and concrete tile in good condition. Soft-wash uses low pressure (under 500 PSI) plus a detergent + biocide solution, and is the only safe method for clay tiles, slate, painted concrete tile and any roof over 15 years old. The wrong method will destroy the surface — high-pressure on aged clay tile blasts off the glaze and dramatically shortens lifespan, while low-pressure on lichen-covered metal won't shift the contamination. Always confirm with the contractor which method they're using and why.
How long does roof cleaning last in Cape Town?
A pressure-wash alone with no biocide treatment is good for 6–12 months in the Cape Town metro — moss spores survive and regrow as soon as winter rain returns. A proper soft-wash + biocide + fungicide treatment lasts 3–5 years before noticeable regrowth, and a clean + coat job (cleaning then a fresh acrylic or polyurethane coating) typically holds 7–10 years. Biocide is what makes the difference; insist on it being included in the quote.
Will roof cleaning damage my tiles?
Done correctly, no. Done incorrectly, yes — and it's a permanent problem. Aged clay and concrete tiles have a glazed surface that high-pressure cleaning can blast off, exposing the porous tile body underneath which then absorbs water faster, accelerates moss regrowth, and shortens the lifespan of the roof by years. This is why soft-wash is the standard for tile roofs over 15 years old. If a contractor wants to use high-pressure on your clay tiles without explaining why, get a second quote — they're either inexperienced or cutting corners.
When should I clean my roof?
March to early May is the ideal window in Cape Town — dry weather for the cleaning itself, then enough remaining warm-dry days for biocide to fully cure, with the work done before Cape winter rain hits and tests the result. November to February is the second-best window if you missed autumn. Avoid winter cleaning (June–August) — biocide doesn't cure properly in the cold, wet rinse-off contaminates storm drains, and contractors charge a weather-risk premium. If you're planning to coat the roof, schedule the coating for 24–72 hours after cleaning so the biocide has dried but the substrate is still freshly clean.
Can I clean my own roof or should I always hire a contractor?
DIY roof cleaning is high-risk and rarely worth it. Roof falls are the leading cause of home-DIY fatalities in South Africa. You also need the right pressure-washer for metal vs the right detergent + biocide for tile — get the wrong one and you damage the roof. Insurance won't pay out if you fall. And the cost saving is marginal: most listed Cape Town contractors charge R3,500–R5,500 for a single-storey clean + biocide, compared to roughly R1,500–R2,500 in equipment hire + chemicals if you DIY. Hire a contractor with proper anchor points, harness, public liability cover and a fixed-price written quote.
Roof Cleaning across Cape Town
We cover the suburbs below — free on-site inspection on every quote:
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