Roof cleaning & moss removal · A focused guide
Should cracked or slipped tiles be assessed before roof cleaning?
Published by Big Ben Roofing Ltd
Report visible cracks, slipped tiles and active water entry before agreeing cleaning. Those concerns need a roofing assessment rather than an assumption that surface work will resolve them. Ask which defects are already identified, which remain uncertain and whether repair is required before the proposed method can proceed. A cleaning quotation should describe its inspection limits and the process for reporting further defects, so appearance work and repairs do not become an undefined combined task.
Create a record before disturbance
Send normal ground-level images showing the affected slope and any visible damaged location. Add the date the defect was first noticed and whether a leak already existed. Avoid estimating how many replacement tiles are needed from a distant view. A pre-work record helps all parties distinguish known concerns from findings made during access, while recognising that some covering and fixing defects will remain concealed initially.
Define the order of work
Ask whether a separate inspection or repair stage is needed before cleaning and who will decide that. If the contractor proposes to combine tasks, the quotation should still identify the materials, repair area and approval process. Check how an unsuitable or newly exposed condition changes the plan. The cleaning method should suit the assessed covering; a visible improvement cannot serve as evidence that the roof’s weathering defects were corrected.
Useful details to record
- Report cracks, displaced tiles and existing leaks early.
- Keep dated overall images of known damaged locations.
- Ask whether repairs precede the cleaning stage.
- Record the decision process for newly discovered defects.
Use information already available from indoors or ground level. Do not climb onto the roof or disturb materials to complete this checklist.
Will a cleaning treatment seal an existing cracked tile?
Do not treat a cleaning product as a specified tile repair. Ask for the defect to be assessed and the repair method described separately, including surrounding details where relevant, before judging whether cleaning remains appropriate for that area.
Background reading
General guidance helps frame the questions. The cause, suitable materials and scope depend on inspection of the particular roof.
Related questions
Is pressure washing suitable for clay roof tiles?
Check a proposed cleaning method against the clay tile covering and manufacturer guidance before accepting a pressure-washing quotation.
How should cleaning be assessed on a slate roof with old repairs?
Discuss slate condition and existing repair details before accepting a cleaning proposal based mainly on the amount of visible growth.
Discuss what you have noticed
Include your postcode, the affected roof section and when the concern appears. The team will review the enquiry and confirm the next step, scope and availability.
Request a roofing assessment