There is a single question that sorts most of these cases: is the roof failing where it stops, or where it does not?
There are several ways into this question. Our Chester guide takes the economics, and the signs guide takes it as four places to look.
This one uses a map. Where on the roof is the trouble — and that single question sorts most cases correctly.
The middle of a slope is the safest part of a roof. It is doing the simplest thing a roof does: overlapping units shedding water downhill, with an underlay beneath as a second line of defence.
The trouble starts where the roof stops. Every junction — a chimney, an abutment, a valley, a verge, an eaves, a parapet, a pipe penetration — is a place where water has to be steered by a formed detail rather than simply shed. Those details are almost always lead, they are the skilled part of the job, and they are where roofs leak.
Each of these has a cause, a location and a fix. None of them means the roof is finished.
The commonest leak on any older roof, and the classic symptom is a ceiling stain directly below a stack. The lead has lifted, the step flashings have come out of the mortar joints, or the mortar itself has gone. A repair, and usually a straightforward one.
Where two slopes meet. They silt up with moss and leaf litter, especially under trees, and once water backs up it goes sideways under the covering. Clearing and, if needed, re-lining is a repair.
On the older Wallasey stock where the roof sits behind a parapet. When these fail the water has nowhere to go but inwards, so the damage looks alarming — but a lining renewed in properly jointed bays is still a repair, not a re-roof.
Older roofs have these bedded in mortar, which cracks over decades. On a ridge that admits water; on a hip a loose unit can slide. Re-bedding and mechanically fixing is a repair, and a worthwhile one.
The mortar edge at a gable, which cracks and lets wind under the covering. Repointing or renewing the verge detail is a repair.
One or two, with a named gale to blame. That is an event, not a condition.
These occur in the middle of slopes, where there is no junction to blame. All three are things present across the entire roof, and none can be renewed without taking the covering off.
Units slipping in ones and twos, in unrelated places, with no storm and no other cause. Every nail on the roof went in at the same time and has sat in the same conditions since, so they corrode together. This is the single commonest reason an older roof needs replacing — and the covering itself is often perfectly sound.
It is also why a nail-fatigued slate roof has a third option worth pricing: strip it, renew the battens, underlay, fixings and lead, and relay the original slates. The roof is fully renewed; the building looks unchanged.
Splitting, or dark and damp. They have carried fixings for decades and older ones are undersized by modern standards. Not visible without lifting the covering, but they are one of the reasons a roof that looks fine from outside is not.
The most important of the three. On a sound roof a slipped unit is an inconvenience: water reaches the underlay and runs to the gutter. Once old bitumen felt has gone brittle and torn — and it goes first at the eaves — the same slipped unit puts water into the house.
There is no way to renew underlay without stripping the covering. Those are the same job.
Most older roofs present as a junction problem sitting on top of a field problem. A chimney flashing fails, and while someone is up there it turns out the underlay is brittle throughout.
That is a genuine decision rather than an obvious one, and it turns on how much life the field has left:
| Junction problem | State of the field | Sensible answer |
|---|---|---|
| Single, with a clear cause | Underlay sound, no unexplained slips | Repair |
| Single, with a clear cause | Underlay brittle, slips starting | Repair now, plan a replacement |
| Several, unrelated | Underlay sound | Repair each, and find out why several went at once |
| Several, unrelated | Underlay brittle or torn | Replace |
| None | Slips in unrelated places, no cause | Replace |
Twenty minutes, and most of it indoors.
Whatever the answer, one thing is worth knowing before you commission anything: a roofer who inspects a single chimney stain and recommends a full re-roof is worth a second opinion, and so is one who patches a fifth unexplained slipped slate without mentioning the underlay.
Two separate systems. Planning: a like-for-like re-roof does not materially affect the external appearance of a building, so under section 55 of the Town and Country Planning Act 1990 it is not development at all and needs no permission. A visible change of covering can be a different matter, particularly inside a conservation area, where the test is applied more tightly.
Building regulations: where more than 50% of the roof's surface area is renewed, or the work forms part of a major renovation, regulation 23 of the Building Regulations 2010 requires the roof to be brought up to current thermal standards so far as that is technically, functionally and economically feasible — 0.16 W/(m²K) for a roof in an existing dwelling. A patch repair does not trigger it, and neither does a roof over unheated space such as a detached garage.
We will look and tell you honestly. If it is a repair, we will say so.
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