Emergency call-out
Loose, slipped & fallen ridge tiles
In short
A ridge tile that has moved is a falling-object risk before it is a leak, so it gets made safe first. The underlying cause is nearly always failed mortar bedding — and under the current standard a ridge has to be mechanically fixed as well as bedded, so simply re-bedding it puts the same failure back.
Also called: Ridge tile fallen off · Loose ridge tile · Ridge tiles coming off · Chimney pot loose
Signs you need this
- A ridge tile visibly sitting proud, tilted or out of line
- Mortar debris on the ground, in the gutter or on a path
- A wavy ridge line where it used to be straight
- A gap you can see daylight through at the ridge from inside the loft
- A chimney pot leaning or rocking
- Anything overhead above a path, door or parking space
A ridge tile weighs a serious amount and it sits at the highest point of the building, so the first question is not whether the roof will leak but what is underneath. If there is a footpath, a doorway, a drive or a neighbour's garden below, the loose unit comes off and comes down under control before anything else is discussed.
The cause is almost always the mortar. Traditional ridges were bedded in a sand-and-cement mortar with nothing else holding them on, and mortar on the most exposed line of the roof takes the full weight of the weather. It cracks, water gets into the crack, frost expands it, and one winter the bond finally fails. On a roof where the ridge was re-bedded once already with a mortar that was too strong or too rich, it fails faster, because a hard mortar cracks rather than flexes.
That is why the standard changed. BS 5534 was revised in 2014 and mortar-only bedding is no longer accepted for ridges, hips or verges — every unit must be mechanically fixed, either through a dry-fix system with a ventilated ridge roll and screwed units, or with clips and screws underneath a traditional mortar bed where the look matters. A quote to simply re-bed a ridge in mortar is a quote to the pre-2014 standard, and on an exposed roof it is a quote to do the job again.
Ridge failure also rarely happens to one tile. If the bedding has gone at one point it has usually gone along a stretch, and the units either side are being held by habit rather than by mortar. Replacing a single tile and leaving the rest is a false economy that gets tested by the next gale — which is why the whole ridge line gets checked whenever one has moved.
Chimney pots belong in the same conversation. A pot is held by the flaunching — the mortar fillet on top of the stack — and that fillet is the most exposed mortar on the entire building. A leaning pot after a gale means the flaunching has cracked, and a cracked flaunching is both a falling hazard and a direct route for water down the inside of the chimney.
The exposure argument matters here more than almost anywhere else on the roof. Temperature falls roughly half a degree per hundred metres, and the Met Office records substantially more air frost on the high ground than on the Cheshire plain — Buxton averages 51.5 air-frost days a year against 40.0 at low-lying Woodford. Freeze-thaw is exactly what kills a mortar bed, and a ridge at 300 metres in Rainow or Kerridge gets many more cycles of it than the same ridge in the town.
What the job covers
- Making the loose unit safe and removing it under control
- Inspection of the full ridge or hip line, not just the failed unit
- Re-bedding and mechanical fixing to the current BS 5534 standard
- Dry ridge system fitted where it suits the roof and the exposure
- Chimney flaunching checked whenever a pot has moved
- Debris cleared from gutters and the ground below
What it costs
We don't publish a price for this yet, because a number pulled out of the air is worse than no number at all — your roofer has to honour it. On roofing it would also be close to meaningless: access is often the biggest single factor, and it varies enormously house to house. You'll get a firm price for your actual job when they ring you back, before any work starts. The quote itself is free and there's no obligation either way.
Common questions
Can you just cement it back on?
It can be re-bedded, but not in mortar alone — that has not met the standard since BS 5534 was revised in 2014. Ridges, hips and verges have to be mechanically fixed as well. Bedding it back the old way on an exposed roof is putting the identical failure back, and it will be tested by the next serious wind.
Do I need the whole ridge done or just the one tile?
Depends what the rest of the line looks like, which is why it all gets checked. If one bed has failed through age and weather, the neighbouring ones are usually the same age and the same condition. Sometimes a single unit genuinely is a one-off; more often the honest answer is that the ridge line has reached the end of its bedding life.
What is a dry ridge system?
A mortar-free ridge: a ventilated roll seals and ventilates along the ridge line, and each ridge unit is mechanically screwed down. Nothing to crack, nothing to fall out, and it ventilates the roof space properly at the same time. It is what nearly every new-build uses now. Where a traditional mortar appearance is wanted or required, the mechanical fixing goes in underneath instead.
Is it urgent?
If anything is loose above a path, a door or where cars park, yes — that is a falling-object risk and it gets dealt with immediately. If it is above a garden nobody uses and the weather is settled, it is important rather than an emergency, and it will be treated that way rather than talked up.
Need this doing in Macclesfield?
Tell us the job and it goes straight to our local roofer — one call back, usually the same day. Free quote, no obligation.