The number of repairs matters less than where they were. Map them, and the roof usually tells you plainly which of two quite different things is happening.
"We keep having to get someone out" is one of the commonest things we hear, and the question behind it is always the same: is this normal maintenance, or is the roof telling me something?
Most advice answers by counting — more than X repairs and you should replace. That is not much use, because six repairs to one stubborn chimney flashing and three repairs in three unrelated places mean opposite things. What actually diagnoses a roof is the pattern: where the repairs were, in what order, and whether each one had a cause.
This costs nothing and it is the single most useful thing you can do before commissioning a survey. Sketch the roof — a rectangle per slope is plenty — and mark on it every repair you can remember, with a rough date.
Then look at the distribution. Roofs fail in one of two ways, and the sketch usually makes it obvious which.
The marks group together. Everything is around the chimney, or along one valley, or on one small area of a slope.
A single unresolved defect, being repeatedly patched rather than diagnosed. The most common culprits are a chimney flashing that was never properly formed, a valley that silts up and backs water under the covering, a lead sheet too long for its own thermal movement, or a junction with an extension roof.
Not replace the roof. Have the actual cause identified and fixed properly — which may mean forming a new lead flashing rather than adding another bead of mastic to the old one. A cluster of repairs in one place is a diagnosis failure, not a roof failure, and replacing the whole roof to solve it would be an expensive way of avoiding the real question.
The marks are spread across the roof with no relationship to each other. Different slopes, different elevations, different years, and nothing linking them.
A general failure of something that is present everywhere. There are only three candidates, and all three are underneath the covering:
Replace. There is no repair that addresses a scattered pattern, because the problem is not in the places that have failed — it is in the places that have not failed yet. Every remaining fixing on that roof is on the same clock. Refixing them one at a time as they let go is a treadmill, and you pay for access every time.
In practice many roofs show both: a cluster around one junction and a scatter elsewhere. That means two separate things are true — a specific defect that needs diagnosing, on a roof that is also reaching the end of its life generally.
Treat the scatter as the decision-maker. If the general failure is established, fixing the cluster in isolation buys you a properly detailed chimney on a roof that still needs replacing.
| What you notice | Usually means |
|---|---|
| Repairs at widening intervals | Roof is stable; each repair solved something |
| Repairs at shortening intervals | Underlying failure is progressing |
| Leaks only in wind-driven rain from one direction | A junction on that elevation |
| Leaks in any prolonged rain | Covering or underlay, generally |
| Water appearing in cold weather without rain | Often condensation, not a leak |
| Nothing for years, then several in one winter | A threshold was crossed — usually the underlay |
That last row is the one that catches people out, and it explains why roofs seem to fail suddenly. Slates may have been slipping for years with the underlay quietly catching the water. When the underlay finally goes, every one of those gaps becomes a leak at once. Nothing changed on the roof that winter — the second line of defence simply ran out.
Ten minutes with a torch on a bright day, and preferably during or just after heavy rain, will confirm the reading.
A scattered pattern outside plus perished underlay inside is about as clear as this gets.
Both errors are expensive. Replacing a roof that needed a properly formed chimney flashing wastes most of the cost of a re-roof. Repeatedly patching a roof in general failure means paying for scaffolding, set-up and waste disposal over and over — none of which scale down with the size of the repair — and you still pay for the replacement at the end.
Which is why the sketch is worth five minutes. It usually answers the question before anyone gets on a ladder.
Tell us the history and we will map it against what we find on the roof and in the loft. If the pattern is clustered, we will quote for fixing the cause properly. If it is scattered, we will show you why and set out what a replacement covers.
Tell us what has been done and where, and we will tell you what the pattern means.
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There is no useful number, and that is why the count is the wrong thing to look at. Six repairs to the same chimney flashing means one unsolved problem. Three repairs in three unrelated places means something quite different and far more serious.
A roofer can usually identify them from the roof and from the loft — replacement slates in a different shade, patches of newer mortar, mastic, fresh felt. It is worth asking for them to be mapped rather than just counted.
Yes. A leak that only shows in driving rain from one direction usually points at a junction on that elevation. One that appears in any prolonged rain points at the covering or the underlay more generally. And water appearing in cold weather without rain is often condensation rather than a leak at all.
Yes, and it is common — because the fixings, battens and underlay across the whole roof are all the same age and reach the end of their lives together. What looks like bad luck is usually one general failure surfacing in several places.
Apex Roofing covers Cheshire and the surrounding area for complete roof replacement, new slate and tiled roofs and re-roofing.
Apex Roofing Cheshire · 105 Fence House, Fence Avenue, Macclesfield SK10 1LM
Tell us about the property and the roof in Northwich, and we will come back to you — usually the same day.
Prefer to talk? Call 07377 461095 · WhatsApp +44 7465 861265 · Email apexroofing14@gmail.com
