Key takeaways
- Clay peg tiles can crack under foot pressure.
- Hand methods are preferred on period properties.
- Replace slipped tiles before cleaning where possible.
- Ridge and hip mortar should be checked during access work.
- Biocide may help on porous handmade clay after scraping.
Looking after clay tiles
Clay roofs are common across Sussex and Kent villages, Buckinghamshire market towns and older London suburbs. Peg tiles hang on wooden battens; interlocking clay profiles appear on reproduction period builds. They are durable but brittle with age, especially when walked on or subjected to uncontrolled pressure washing.
Moss should be lifted with hand tools rather than ground into the tile face. Operatives use crawling boards or platforms to spread load rather than stepping directly on fragile courses. Broken or slipped tiles should be noted before work so cleaning does not make underlying defects worse.
Common clay roof problems
Failed pegs, slipped tiles and cracked nibs are maintenance items separate from moss removal. Cleaning reveals defects that were hidden under green growth, which is useful before sale or survey.
- Slipped tiles in valleys and eaves
- Cracked or spalled tile surfaces
- Open ridge mortar letting in driving rain
- Moss lifting tile edges on shaded slopes
Understanding clay and peg tiles
Clay tiles are common on period homes across Sussex, Kent and Buckinghamshire villages. Peg tiles hang on wooden battens; machine-made clay interlocks on newer period-style builds. They are durable but brittle with age, especially when walked on or subjected to uncontrolled pressure washing.
Hand scraping removes moss without grinding it into the tile face. Operatives use boards and platforms to spread load rather than stepping directly on fragile courses.
UK building and insurance considerations
Roof cleaning is maintenance, not structural alteration, and normally does not require planning permission on domestic properties. Listed buildings and conservation areas may have additional constraints: check with your local authority if unsure.
Inform your insurer if significant roof work is planned. Document professional cleaning with dates and photographs, which helps at sale and if weather-related claims arise later.
Combining roof work with gutter clearing
Moss removed from tiles often washes into gutters within days if channels are already part-full. Booking gutter clearing during or immediately after roof cleaning prevents a second blockage problem.
Valley gutters and hidden parapet gutters on older properties deserve explicit attention because they are not visible from the ground.
Frequently asked questions
Can clay tiles be pressure washed?
Usually not when aged or handmade. We assess each roof individually and default to hand scraping.
Do you cover London and the South East?
Yes. We regularly work in London and the South East and across Surrey, Sussex and Kent.
Can you quote from photos?
Often yes. Send your postcode and clear images of each roof slope or gutter run. Satellite view helps for access planning.
How soon can you attend?
Availability varies by season. Autumn and spring are busiest. Contact us with your postcode for current slots in London and the South East.
Are you insured?
Yes. We use appropriate access methods and are SafeContractor approved.
Will cleaning fix a leak?
Cleaning removes moss and debris but does not repair broken tiles, failed underlay or cracked mortar. We note visible defects during work.
Should roof and gutter work be booked together?
Often yes. Moss removed from the roof should not be left to block gutters the following week. Combined visits reduce overall cost and disruption.
Need a quote? Contact David White Roof Cleaning with your postcode and photos. We cover London and the South East.