Roof Cleaning Cape Town covers removing moss, lichen, algae, dirt and organic growth from tile and metal roofs. Compare quotes from contractors who clean roofs without damaging them, which is a real distinction.
It is done for appearance, as preparation before coating, and to stop organic growth holding water against the covering and blocking valleys and gutters.
Roof area, roof material, and how heavy the growth is.
Get Roof Cleaning QuotesWhat Grows On Cape Town Roofs
| Growth | Where it appears | Effect |
|---|---|---|
| Moss | Shaded southern slopes, under trees, damp suburbs | Holds water against the tile, blocks valleys and gutters |
| Lichen | Anywhere with age, bonded hard to the surface | Etches into the tile surface, difficult to remove |
| Algae | Damp, shaded areas | Dark staining, mostly cosmetic |
| Salt and grime | Coastal properties | Accelerates corrosion on metal roofs |
| Wind-blown sand and dust | Exposed sites, summer south-easter | Settles in valleys and gutters |
| Leaf litter | Under mature trees | Dams valleys and gutters, holds moisture |
Pressure Washing Versus Soft Washing
High pressure removes growth quickly and is standard before roof coating. It also strips the surface layer of aged concrete tiles, can drive water under the covering if aimed uphill, and will destroy fragile or old fibre cement. Pressure needs to be matched to the material and the nozzle kept moving downslope.
Soft washing applies a biocide solution at low pressure and lets it kill the growth, which then weathers off over weeks. Gentler on the covering and longer lasting against regrowth, but slower to look clean and generally not enough on its own before painting.
Never pressure-wash an old grey cement roof. Fibre cement sheeting and slates installed before the mid-1990s may contain asbestos, and high-pressure washing releases fibres into the air and into the surrounding property. Have the material sampled and analysed before anyone cleans it. See asbestos roof removal in Cape Town.
Roof Cleaning Cape Town Prices
| Service | Indicative range | Notes |
|---|---|---|
| Pressure wash, tile roof | R35 – R80/m² | Growth-dependent |
| Pressure wash, metal roof | R30 – R70/m² | Lower pressure used |
| Soft wash with biocide | R45 – R100/m² | Gentler, slower to show results |
| Fungicidal treatment only | R20 – R45/m² | Applied after cleaning |
| Heavy lichen removal | R70 – R150/m² | Labour intensive |
| Typical 150m² house | R5,500 – R14,000 | Cleaned and treated |
| Gutter clearing with the clean | R850 – R2,800 | Necessary afterwards regardless |
| Clean and seal / coat | R90 – R190/m² | Cleaning plus a coating system |
| Access or scaffolding | R3,500 – R25,000 | Steep pitch or double storey |
Indicative Cape Town ranges, not quotations. How much growth is present is the biggest variable, and heavy established lichen can double the labour compared to a light algae film on the same roof area.
Get the clean quoted with gutter clearing, because the debris has to go somewhere.
Compare Roof Cleaning QuotesDamage To Watch For
- Water driven under the covering. Spraying uphill forces water past laps and under tiles into the roof space.
- Stripped tile surface. Excessive pressure on aged concrete removes the cement surface, leaving the tile more porous than before.
- Broken tiles. From foot traffic during cleaning rather than from the water itself.
- Blocked gutters. All the removed growth washes into the gutters and must be cleared afterwards.
- Damaged coatings. Pressure washing a previously painted roof can take the coating off with the moss.
- Runoff onto plants. Biocides and dislodged growth land in the garden, so beds should be covered or rinsed.
Cleaning Before Coating
Where cleaning is preparation for roof painting in Cape Town, it needs to be thorough: moss, lichen and the chalky surface layer all prevent adhesion, and any coating over them will flake. In that case have both quoted by the same contractor so responsibility for the finish sits in one place.
Frequently Asked Questions
How much does roof cleaning cost in Cape Town?
Roughly R35 to R80 per square metre for a pressure-washed tile roof, and R45 to R100 for soft washing. A typical 150 square metre house lands between R5,500 and R14,000 cleaned and treated.
Does pressure washing damage roof tiles?
It can. Excessive pressure strips the surface layer off aged concrete tiles and leaves them more porous, and spraying uphill drives water under the covering. Pressure has to be matched to the material.
What is soft washing?
Applying a biocide solution at low pressure to kill the growth, which then weathers off over the following weeks. Gentler on the roof and longer lasting against regrowth, but slower to look clean.
How often should a roof be cleaned?
Every three to five years for most properties. More often under heavy tree cover or on shaded southern slopes where moss establishes quickly.
Will cleaning stop the moss coming back?
Cleaning alone does not. A fungicidal treatment applied afterwards slows regrowth considerably, and trimming overhanging branches to let light and air onto the roof helps more than either.
Can an old grey cement roof be pressure-washed?
No, not before it has been tested. Cement sheeting and slates from before the mid-1990s may contain asbestos, and pressure washing releases fibres. Have it sampled and analysed first.
Does cleaning need gutter clearing afterwards?
Yes. Everything removed from the roof washes into the gutters, so clearing them is part of the job and should be in the quote.
How long does roof cleaning take?
A typical house is one to two days including treatment and gutter clearing. Heavy lichen takes longer.
Roof cleaning through Roofing Contractors Cape Town is often quoted together with painting or maintenance, which usually works out cheaper than separate visits.
Related Roofing Services
Roofing Contractors Cape Town is a free quote-comparison service. The roofing work is carried out by the independent contractors that quote you, and your contract is with the contractor you appoint. Ask each contractor for their company details, references and insurance cover before appointing anyone.
Moss or dirt on your roof? Compare quotes from cleaning contractors servicing Cape Town and check what method they use on your roof material.
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Send the roof area, roof material and how heavy the growth is, and contractors will quote directly.
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