A new roof is one of the biggest sums most homeowners will spend on their property, so it is fair to want to know how many decades you are buying. The honest answer is that it depends far more on the material and the quality of the installation than on any single headline figure. Here is what to expect from each type of roof covering commonly fitted across Newark, Nottinghamshire and Lincolnshire.
The roof covering does most of the work in deciding lifespan. The figures below assume the roof was fitted properly, with sound battens, a breathable membrane and correctly fixed tiles, and that it gets basic maintenance over the years.
Concrete interlocking tiles are the most common covering on post-war housing around Newark and Lincoln, and they are hard-wearing. Clay tiles cost more but outlast them comfortably, which is why so many Victorian and Edwardian terraces in the area are still carrying their original clay. Natural slate can outlive everyone reading this article, though the fixings often fail long before the slate itself does.
When a roof fails, it is rarely because the tiles have worn out. Far more often it is the battens, the underlay, the nails or the mortar work that has given up. Older roofs fitted before the 1990s typically have bitumen felt underlay, which goes brittle and tears after 30 to 40 years, letting wind-driven rain through to the loft even though the tiles look perfectly fine from the street.
Mortar bedding to ridges, hips and verges is another weak point. Cement mortar in this part of the country tends to crack and fall out within 15 to 25 years because of freeze and thaw cycles, which is why repointing of ridge tiles is one of the most common jobs we are asked to do. Since 2015 the British Standard for slating and tiling has required ridges and hips to be mechanically fixed rather than relying on mortar alone, so a new roof done to current standards should hold up much longer at these details.
Lead flashings around chimneys and abutments generally last 60 years or more if the lead is the correct code and properly dressed. Cheap substitutes and thin lead fail much sooner and are a frequent cause of damp patches on chimney breasts.
Our local weather is not extreme, but it is persistent. The flat, open landscape across Lincolnshire and the Trent valley means exposed roofs take a lot of wind, and a tile that was never nailed or clipped will eventually lift. Moss is the other big local factor. North-facing slopes on concrete tiles collect moss quickly in damp, shaded gardens, and heavy moss holds water against the tile surface and blocks the gaps that let the roof shed rain.
Poor ventilation does quiet damage from the inside. A loft packed with insulation but no eaves or ridge ventilation traps moist air, which rots battens and rafter ends over a couple of decades. Blocked or undersized gutters cause fascia boards and the ends of rafters to rot, and once the fascia goes the bottom course of tiles loses its support.
Workmanship is the factor you can control most. A roof fitted with tiles laid at the correct gauge, every perimeter tile fixed, a breathable membrane lapped properly and lead flashings rather than sealant will outlast an identical roof done in a hurry by a good 15 to 20 years.
A new roof does not need much attention, but it does need some. A visual check from the ground each spring and autumn will catch slipped tiles, cracked ridge mortar or lifted flashings before water gets in. Have the gutters cleared at least once a year, more often if you have overhanging trees.
Treat moss rather than pressure washing it, because pressure washing strips the surface off concrete tiles and knocks out mortar. Where the roof does need someone up there, use a roofer who will walk it properly on crawl boards rather than straight across the tiles. Keeping a record of the work done, the products used and any guarantee paperwork also makes a difference if you sell the house, as surveyors will ask.
Most reputable roofers offer a workmanship guarantee of 10 to 20 years on a full re-roof, and tile manufacturers commonly give 30 years or more on the tiles themselves. Read the small print, as manufacturer guarantees usually only cover the product failing, not the labour to replace it, and they may require the roof to have been fitted by an approved installer to a specific specification.
An insurance-backed guarantee is worth asking about, because a written guarantee from a business that no longer trades is worth nothing. A realistic expectation for a properly fitted concrete or clay tiled roof in this area is that you will not need to think about replacing it again in your lifetime, though you should plan for repointing and minor repairs along the way.
Usually not. If the roof is old enough to need retiling, the battens and felt are almost always past their best too, and stripping back to the rafters costs little extra once the tiles are off. Reusing sound clay tiles or slates on new battens and membrane is a sensible middle ground.
Look for slipped or cracked tiles, daylight visible in the loft, damp or stained rafters, crumbling ridge mortar and felt that is torn or hanging down between the rafters. If you are seeing several of these together on a roof over 40 years old, it is worth getting it assessed rather than patching it again.
It reassures buyers and surveyors, and it removes a common reason for renegotiation after a survey. You will rarely recover the full cost in the sale price, but a roof flagged as failing on a survey can cost you far more than the re-roof would have.
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