Roof cleaning and moss removal in Bognor Regis

Three different things grow on roofs, and telling them apart decides whether a roof needs scraping, treating or simply leaving alone.

Plenty of roofs on this coast pick up something green or black sooner or later, and the first job is to name it. Moss is a cushion of tiny plants that roots into the gaps between tiles and into the rough face of concrete. Algae shows as dark streaks or a thin green film, usually where a slope stays damp longest. Lichen is the flat, crusty patchwork of grey, yellow or orange that grips tile and slate and grows slowly. Together they make up the organic growth on a roof, and each answers to a slightly different treatment. So a roof cleaning visit begins with an assessment, not a ladder and a scraper.

1.1 Why moss takes hold in Bognor Regis

Moss needs moisture, shade and something to grip. Sea weather supplies plenty of the first: driving rain, damp air off the Channel and mornings when the roof never quite dries out. A slope shaded by a neighbouring house, a tall tree or a chimney stack stays wet longest, which is why moss often grows thickly on one side of a roof and barely touches the other. Shallow pitches shed water more slowly than steep ones, so a low bungalow roof can green over faster than a steep Victorian slope nearby. Dead leaves, grit and old moss then pile up in the valleys and along the eaves, and that layer feeds the next crop. A valley, for anyone new to the word, is the angle between two slopes that funnels rain towards the gutter.

1.2 Is moss really bad for a roof

A little moss on a sound roof is not an emergency, and we tell you when that is the case. Heavy growth is another matter. It keeps water against the tile surface long after the rain has stopped, and the clumps trap debris that blocks valleys and gutter outlets. Lumps that break loose in a gale wash into the gutter and settle at the outlet. Thick moss can also hide a slipped or cracked tile, which is why we look underneath it before treating anything.

Algae and lichen are mostly a matter of looks, though a roof streaked black is often a roof that stays damp. We judge each case on its own merits. A light film on a sound slope may only need a treatment, while a thick mat across a valley needs lifting by hand first. Growth that returns quickly usually points to shade, a blocked gutter or an overhanging tree, and we tell you which we can see.

Roof cleaning in Bognor Regis, West Sussex, is therefore a judgement about moss growth and the roof beneath it. To safely clean a roof, remove moss without harming the tiles and protect your property below, the order of work matters. Roof cleaning, moss removal and treatment belong together in one visit, whereas roof moss removal on its own, with no biocide, leaves the underlying growth free to return. After any roof cleaning, roof moss growth is the thing to watch, and Bognor Regis roof cleaning that includes the gutters keeps the water moving.

A good clean follows a set order: assess, make safe, lift the moss, treat, rinse, clear the gutters, then photograph the result.

Every job starts with an assessment, and it comes before any price. We look at the roof from the ground and, where access allows, from a ladder, a tower or the roof itself. We note the covering, the pitch, the amount of growth and the state of the gutters, and we photograph anything cracked, slipped or lifting. You receive the photographs with the written quote, which means you can check the findings for yourself from the ground. That quote is a single total price for the whole clean.

3.1 Access and safe working

Safe cleaning depends on access. A single-storey bungalow roof is frequently within reach of ladders plus a roof ladder, which spreads weight along the slope and hooks over the ridge. A tall terrace or a house with a steep rear slope usually needs a scaffold or a tower, and a scaffold on a pavement or road needs a licence from the highway authority. Fragile roofs, such as rooflights and old cement sheets, are marked and avoided. Wet moss and wet slate are slippery, so some jobs wait for a drier day. Overhead cables, a conservatory roof below the working area and the neighbour's boundary are all noted at the assessment, and we agree where the ladders and tower will stand before the day.

3.2 Moss off, treatment on, everything rinsed

Work runs from the top down. Moss is lifted from the ridge, then the hips and valleys, then across each slope towards the eaves. Debris is bagged and carried down rather than raked into the gutter. The biocide goes on next, at low pressure. Finally the gutters and downpipes are cleared, the fascia and soffit are washed, and the cleaning result is photographed from the same positions as the survey. Cracked tiles or lifted lead found on the way are shown to you, never fixed without your say-so.

3.3 Taking care of the roof as we go

Where moss has grown through the joint between two tiles, it is teased out rather than torn, so the tile is not dragged from its course. Valleys get particular attention, because a valley that stays clogged sends water sideways under the tile edges. We stay off ridge and hip tiles wherever we can, and we look at the bedding and fixings as we pass. When the work is finished, the site is cleared and the waste taken away: bagged moss, leaves and grit go in our vehicle, not your bin. Paths, drive and any patio below the roof are swept before we leave.

Each covering is cleaned differently, and some roofs need permission, a pause or a specialist check before anyone touches them.

Concrete tiles are the most common covering on estates built since the mid twentieth century, and they tolerate treatment well provided the surface is not stripped. Marley gives concrete tiles an expected life of around 60 years, with no guarantee attached, and a surface scoured by a jet is unlikely to get there. Clay tiles, glazed or unglazed, are more varied, so we test a small patch first. Arun's Craigweil House conservation area statement records plain clay tiled roofs as part of the traditional construction in Aldwick, and old clay of that kind is cleaned by hand, a few tiles at a time. Natural slate is cleaned gently by hand, because well-kept slate lasts beyond 100 years according to the Confederation of Roofing Contractors and thin old slates break underfoot.

5.1 Listed buildings and conservation areas

Cleaning a roof is maintenance rather than a change to its appearance, so it rarely needs consent, but the setting matters. Arun lists The Steyne with Waterloo Square as a conservation area, designated in August 1979 and extended in July 1994, and Aldwick Road as another, designated in July 1994. Arun's guidance there prefers natural slate or plain clay tile, and notes that on Aldwick Road slate has commonly been replaced with concrete interlocking tiles, so two coverings can share one terrace. If your home is listed, check with Arun District Council's planning team before anything beyond routine maintenance.

5.2 Cement sheet, lead and solar panels

Corrugated cement sheet on an old garage or outbuilding is fragile, and HSE tells owners to treat any building built or refurbished before 2000 as if asbestos is in it. Those sheets are identified first, and nobody walks on them. Lead flashings, the metal strips that seal a roof against a wall or chimney, are looked over once the moss is off, and lifted lead is a repair rather than a cleaning job. Solar panels sit on many roofs here. We work around them, and solar panel cleaning is a task in its own right, so we agree it with you rather than assume it. Gutters and downpipes on a garage or extension get the same treatment as the main house, since a blocked outbuilding gutter tends to be forgotten until the wall turns green.

Bats are protected, and so are nesting birds, so we look for roosts and nests under eaves and ridge tiles before any scraping starts. Our page on cleaning roofs on historic and listed buildings covers consent routes in more depth. Chimneys on the older terraces stand tall on the skyline, and Arun calls them important features of the conservation areas, so moss round the flaunching, the sloped mortar cap around the pots, gets checked while we are up there.