Roof Cleaning & Moss Removal in Holloway, London

A thin patch does little harm, but a thick mat holds water against the covering long after rain, keeps tiles and slates wet through the winter and speeds up frost damage. It also sheds into the gutters, where it can block outlets and cause overflow. On a shaded north London roof it can build up quickly. Clearing it is much cheaper than repairing the damage it helps to cause.

High-pressure jetting strips the protective surface from concrete and clay tiles, forces water under the laps and can lift or crack old slates. It can also dislodge a lot of debris into the gutters at once. The result is a roof that looks clean for a few months but is weaker than before. Hand scraping and a soft-wash biocide achieve the clean without the damage, and they let the roofer inspect each tile.

A typical terrace roof can often be scraped and treated in a day, depending on size, access and the thickness of the growth. The biocide then works over the following weeks, so the roof looks cleaner gradually as the dead growth washes away. Weather matters, since the treatment needs a dry spell to be applied properly. The partner company will give you a realistic timetable at survey.

It depends on the roof and its surroundings. A sunny, open south-facing slope may need little, while a shaded north slope beside mature trees, such as around Finsbury Park or Highbury Fields, may need attention every few years. Regular gutter clearing is a more frequent job, because leaves build up each autumn. The survey will tell you how quickly growth is returning and what interval makes sense.

It can. Thick moss can hold cracked tiles in place, cover open laps and hide failed fixings, so a roof is often easier to assess once it is clean. The partner company checks the surface as it works, notes any broken tiles, slipped slates or failing mortar, and quotes for repairs separately. That gives you an honest view of the covering before problems become leaks.

The price depends on the size and height of the roof, the thickness of growth and whether scaffolding is needed, which published London guides put at roughly £500 to £1,200 when required. A terrace roof reached by ladder is much cheaper than a tall house needing scaffold. We do not quote a figure from here. The partner company gives a written quote after seeing the roof.

Yes. Cleaning does not change the appearance of a roof's material, so it does not normally need permission, though a listed building should be checked. Gentle methods matter more on a protected street, because aggressive cleaning could damage original slate or clay. Islington has Article 4 directions in 40 of its 42 conservation areas, but those control alterations, not routine cleaning.

It is sensible, because the moss and debris removed from the roof ends up in the gutters and downpipes. A clean followed by a gutter clear stops that debris causing a blockage and overflow. On roofs near mature trees, leaf litter adds to it. Our guttering, fascias and soffits page explains how runs are cleared and re-aligned.

On shaded or damp slopes it eventually will, but the biocide treatment slows regrowth, often for a couple of years, and a roof that is kept clear of leaves dries more quickly. Trimming overhanging branches, where possible, also helps. The partner company can advise on how quickly growth is likely to return on your roof, and whether a periodic light clean is worthwhile.

An independently owned partner roofing company does the work, not an in-house crew of ours. It surveys, gives you a written quote, carries out the clean, then invoices you and takes payment directly. We handle no payment or invoices, we text you the company's name before anyone arrives, and if something is not right you ring 07883 305739 and we chase it. See how a partner is assigned.