Identify the covering before choosing a process
Clay and concrete tiles can look similar from ground level, particularly after years of weathering. Colour alone is not a reliable way to identify them. Different profiles, finishes and ages also mean that a method used on a neighbouring house may not be suitable for yours.
If you have invoices, spare tiles, a product name or information from an earlier roof replacement, mention it when enquiring. Do not lift a tile or go onto the roof to identify it. Where the material remains uncertain, the quotation should allow for a competent assessment.
Condition can matter more than appearance
Ask the assessor to consider damaged or loose units, worn surfaces, mortar details and any known history of leaks. A clean changes the surface appearance; it cannot repair defects beneath the covering or restore missing material.
White deposits, general fading and organic growth should not automatically be treated as the same problem. If the marks have not been identified, ask what is being removed and what is likely to remain. A promise of a uniform new-looking finish can create expectations the existing roof cannot meet.
Check the relevant guidance
Marley does not recommend high-powered jet washing or walking directly on its tiles. For your roof, ask which manufacturer guidance applies and how the proposed work respects it. If product information cannot be found, that uncertainty should lead to caution rather than an assumption that any process is acceptable.
Request a plain-language explanation of the intended tools, access and protection measures. A small trial area, where appropriate, may help set appearance expectations, but it does not prove that the entire roof is sound.
Agree the boundaries of the work
Before booking, confirm:
- The covering identified and any uncertainty about it.
- Which slopes will be cleaned and which areas are excluded.
- Any defects needing a roofer first.
- The expected finish and marks that may remain.
- How debris and gutters will be dealt with.
For a Wirral property, send Just Clean Roofs your postcode, a short description and any roof information you already have. The first decision is whether cleaning is appropriate, followed by a clear proposal for the agreed work.
View our roof-cleaning information for Wirral or explore the main roof-cleaning service.
Useful next steps
You may also find these guides useful: Roof-cleaning methods explained: removal, washing and treatment, Considering cleaning a slate roof? Start with these questions.
