Slate roofs across Brighton and Hove, Lewes and the older parts of Worthing are often well over a century old, and most of them are still doing their job. The tricky part is knowing when a handful of slipped slates is just wear and tear, and when it is the first sign that the whole roof is on its way out. This guide explains what to look for, what each option realistically costs, and how to avoid paying for repairs on a roof that is already beyond saving.
Good Welsh slate can last 100 to 150 years, and some Victorian roofs in Brighton are still on their original covering. What gives up first is almost always the fixings. Old iron or steel nails rust through, a problem roofers call nail sickness, and once that starts, slates begin sliding out one after another. Salt air along the seafront speeds this up noticeably compared with roofs a few miles inland.
The other common culprits are the timber battens the slates hang on, which can rot after decades of minor leaks, and the leadwork at valleys, chimneys and abutments. Lead flashings on older roofs are often thin, split or patched with mastic, and a failed valley will let far more water in than a couple of missing slates ever will.
Cheaper imported slates fitted in the 1970s to 1990s are a different story. Some Spanish and Chinese slate of that era delaminates, softens or goes rusty from iron pyrites within 25 to 40 years. If your slates are flaking in layers or turning brown, the slate itself has failed and repair is only ever a short term fix.
If the roof is generally sound and the problem is localised, a repair makes sense. A competent roofer can refix slipped slates using copper tingles or lead straps, replace cracked ones, and remake a small area of leadwork in a day or two. On a typical Brighton terrace, one visit to deal with a few slates and some pointing might cost in the region of 250 to 600 pounds depending on access.
The test is whether the fixings elsewhere are still holding. If you have lost three slates in twenty years, repair. If you have lost three this winter, a dozen last year and there are tingles all over the roof already, you are paying to chase a problem that will keep coming back.
Widespread nail sickness is the clearest indicator. If a roofer can lift slates by hand across the roof, or you see a scatter of tingles across every slope, the fixings have gone and the covering is being held on by friction and habit. Repairing that is like patching a bicycle tyre that is perishing all over.
From inside the loft, look for daylight through the slates, damp or dark staining on the rafters, and battens that crumble when pressed. Sagging along the ridge or between rafters usually points to timber problems that need addressing before any new covering goes on. Delaminating or soft slates, as described above, cannot be reused and mean a full strip regardless of how the fixings look.
A proper re-roof means stripping the slates, checking and repairing the rafters, fitting a breathable membrane, new treated battens and new slates or the sound originals re-hung with copper or stainless nails. Leadwork to valleys, chimneys, parapets and abutments should be replaced in new Code 4 or Code 5 lead at the same time, since it is false economy to leave 80 year old flashings under a new roof.
For a mid terrace in Brighton with two straightforward slopes, expect somewhere in the region of 9,000 to 16,000 pounds using new Spanish slate, and more for Welsh slate, which is the best option for longevity and can add 40 to 60 percent to material costs. Salvaged Welsh slate is often a good middle ground if you want to keep the look of an older street. Scaffolding, skips and any conservation area requirements all move the figure, so treat these as a guide rather than a quote.
In Brighton and Hove, many older streets sit within conservation areas and some houses are listed. In those cases the council may expect natural slate rather than a fibre cement substitute, and listed buildings need consent before work starts. Check with the planning department before committing to a material.
Ask any roofer who quotes to explain what they found, not just what they propose. A survey should include a look inside the loft, a check of a few slates for fixing condition, and a proper assessment of the leadwork. Be cautious of anyone who recommends a full replacement from the pavement, or who offers to fix a roof with widespread nail sickness by pointing or spraying the underside, which tends to trap moisture and rot the battens faster.
If you are told the roof has a few years left, it is reasonable to do a careful repair now and budget for a re-roof later, provided the repair is done with proper fixings rather than glue or mastic. Getting two or three opinions is worthwhile on any job over a few thousand pounds, and photographs from the roof should be part of what you are given.
If the fixings and battens are otherwise sound, a proper repair with tingles or lead straps can hold for many years. If nail sickness is widespread, repairs typically buy one to three winters before the next slates slip.
Yes, sound Welsh slate is frequently re-hung on new battens with new nails, often with around 20 to 30 percent replaced from salvaged stock. Delaminating or soft slates should not be reused.
Almost always. Valleys, flashings and chimney aprons are the most common leak points on a slate roof, and replacing them in new lead while the scaffold is up costs far less than returning to do it later.
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