Pointing is the mortar that holds your roof together at the joints — the ridges, the verges, the chimney stacks, the stonework. It's also, statistically, the most common roof defect flagged in RICS homebuyer surveys. So when does it actually need doing, and how do you tell before a surveyor or a leak tells you instead?
How long pointing lasts
Sand-and-cement pointing typically lasts 8 to 15 years. A polymer-modified mortar lasts 15 to 25 years. Dry ridge and dry verge systems — the mechanical, mortar-free alternatives — last 25 to 50 years. Most UK roofs need pointing attention every 15 to 25 years. If your roof's pointing is older than that and hasn't been touched, it's worth a look, even if nothing's obviously wrong yet.
The signs you can check yourself
You don't need to be a roofer to spot pointing that's failing. Walk out to the garden with binoculars and check:
Mortar debris collecting in the gutters below the ridge — that's the ridge pointing washing out. Cracks running along the ridge line, visible from the ground. Mortar that looks lighter or bleached against the tile — it's lost its binder and is close to going. Moss or vegetation growing along the ridge or verge, which only takes hold once the mortar has deteriorated enough to hold water. A brown stain on the ceiling directly below the ridge. And pieces of mortar on the drive after windy weather.
If you're seeing two or three of those, the pointing is past its best. One alone might be cosmetic, but a combination is the roof telling you it's time.
Repointing versus re-bedding — the bit that matters
Here's the distinction that separates a roofer who knows the trade from one who doesn't. If the ridge tiles still sit firm and only the mortar on top has cracked and crumbled, repointing will do — raking out the failed mortar and replacing it. If the tiles themselves move, rock or lift, the bedding underneath has failed, and just sealing the outside rarely lasts. That needs re-bedding: lifting the tiles, removing the failed mortar underneath, and setting them back down on fresh.
I see plenty of "repointing" jobs where someone's smeared mortar over the top of a ridge whose bedding has gone. It looks all right for a year, then the tiles move and the new mortar cracks with them. Doing it properly means knowing which of the two your roof actually needs — and being honest that re-bedding costs more because it's a bigger job.
Why Derbyshire weather makes it worse
Chesterfield sees around 865mm of rain a year — meaningfully above the England average — with June the wettest month at 86mm. That saturation, plus the freeze-thaw cycling through a Derbyshire winter, is what cracks lime and cement mortar on ridges, verges and stacks. The higher, more exposed ground toward the Peak fringe takes the worst of the wind too, which strips ridge and verge pointing faster than in the shelter of the town.
On the stone-built cottages and terraces through the old pit villages, much of the original pointing has simply reached the end of its life at the same time — whole streets of housing of the same age, failing together. It's a genuine, specific thing about this area, and it's why pointing work comes in waves across a village.
What it costs
Ridge tile repointing starts at around £300 for a straightforward section. Re-bedding is more because it's a bigger job — lifting and re-setting the tiles. Repointing a chimney stack, with scaffolding, typically runs £300 to £600. Wall and gable stonework repointing is priced per square metre — roughly £40 to £70 — with scaffolding where it's needed. All of it is quoted in writing, with scaffolding included where it's genuinely required.
You might not need it yet
A honest caveat: pointing that's cosmetically tired — a bit crumbly on the surface, a little faded — but structurally sound can wait a season. Not every crack means a crisis. If the tiles are firm, the gutters aren't filling with debris, and there's no damp inside, it's a job for the diary rather than a job for tomorrow. We'll tell you which it is when we look — pointing that can wait is pointing that can wait.
If you want a proper set of eyes on your pointing across Chesterfield, Clay Cross or the villages, ring 07949 348947. Free quote, honest answer about whether it's repointing, re-bedding, or nothing yet.