What is a dry ridge system?

It is a way of fixing ridge tiles with screws and clamps rather than bedding them in mortar. A ventilated roll runs along the apex and seals the joint while letting air out of the loft. Each tile is then mechanically fixed. Nothing relies on mortar to hold it down, so frost and wind have nothing to break apart.

Is dry fixing a Building Regulations requirement?

It comes from a standard rather than the regulations. BS 5534, the British Standard for slating and tiling, was revised so that ridge, hip and verge tiles must be mechanically fixed. Mortar can still be used for appearance, though it can no longer be the only thing holding a tile on. Any competent re-roof in Leeds is done to that standard now.

Can a dry ridge go on a stone slate or a Welsh slate roof?

Yes. There are systems designed for stone and natural slate roofs that take the original ridge tiles and fix them mechanically, so the roof looks unchanged from the street. That matters in Horsforth, Morley and the conservation areas, where a bright plastic verge trim would look out of place. We show you the profile before ordering.

Will it stop my loft being damp?

It helps. A ventilated ridge roll lets warm moist air escape at the highest point, which is exactly where you want it to go. Combined with clear eaves ventilation it usually deals with the condensation we see on the underside of newer membranes. It will not fix damp coming from a leak, and we check for that first.

Why did my mortar ridge fail so fast?

Mortar on a ridge is exposed on both faces and takes the full force of the wind and rain. Water gets into hairline cracks, freezes overnight, expands and opens them wider. Leeds gets enough freeze and thaw cycles through the winter to turn a well bedded ridge into loose sand in fifteen or twenty years. A steep exposed gable in Morley or Wetherby goes faster.

Do I need the whole ridge done or just the loose tiles?

If two or three tiles are loose and the rest of the bedding is solid, we re-bed those and leave the rest. Once a third of the line has gone, doing it piecemeal means paying for scaffold twice. The scaffold is a big share of the cost on ridge work, so the economics usually favour doing the full run in one visit.

Dry Ridge and Verge Systems in Leeds

Converting a mid terrace ridge line to a dry ridge system in Leeds costs £850 to £1,900, against £750 to £1,700 to re-bed the same ridge in mortar. Dry systems clamp each tile down mechanically, so wind and frost cannot work the joints loose the way they do with mortar.

Signs you need this

Mortar dropping out of the ridge line and landing in the gutter

A ridge tile you can rock by hand, or one that has already blown off

Open joints visible along the ridge when you look up from across the road

Mortar missing along the verge at the gable end, with slate edges exposed

Sand and grit washing down the slope after every heavy shower

A neighbour's ridge tile in your yard after a named storm

Why mortar bedding stopped being good enough

For a century every ridge and verge in Leeds was bedded in sand and cement or lime mortar. It worked while the mortar was sound. The trouble is that a ridge tile sits at the most exposed point on the building with mortar visible on both sides, and mortar is not a fixing. It is a gap filler that happens to be sticky.

Rain gets into the surface, frost expands it, and each cycle opens the crack a little further. After enough winters the mortar is sand you can brush out with a gloved hand. The tile is then held by its own weight, which is what sends ridge tiles into back yards during a westerly gale.

The industry answer was to revise BS 5534 so ridge, hip and verge tiles have to be mechanically fixed. Mortar can stay for looks. Something metal has to do the holding.

What the work involves

We strip the ridge tiles off, clean the bedding back and check every tile. Concrete ridge tiles that are cracked get replaced. Clay and stone ridges usually survive the lift and go back on, which matters when the roof needs to look original.

A ventilated ridge roll goes down the apex, dressed over the top course of slate or tile on each side. Then either a bracket under each tile or a union between tiles takes a screw into the ridge batten. The finished line looks like a mortar ridge from the street unless you know exactly what you are looking for.

Verges work the same way. Dry verge units clip over the barge board and lock the edge of each course down, which also gives a cleaner line than a weathered mortar edge and removes the strip of mortar that used to blow out every few years.

Where it matters most in Leeds

Exposure is the deciding factor. A mid terrace in Chapel Allerton with houses either side is sheltered. A gable end in Morley or Wetherby with open fields to the west takes the full weight of the wind coming off the Pennines, and that is where mortar verges strip first.

Long unbroken terrace ridges have their own problem. On a Leeds back to back the ridge runs continuously across several houses. If your section is dry fixed and the neighbour’s mortar goes, the failure is still on your roof line. We price the run we can reach and tell you honestly where the weak point sits.

Ventilation while we are up there

A dry ridge gives you high level ventilation almost for free, so it is worth checking the other end of the loft at the same time. If the eaves are blocked with insulation or a boxed soffit, the air cannot move and the ridge vent has nothing to draw. We look at both ends and tell you what is actually happening in your loft.

How the work runs

Assess the ridge line

We check every tile for cracks, look at how much of the bedding has gone, and see whether the existing tiles can be reused or need replacing.

Strip the old bedding

Ridge tiles come off and the old mortar is cleaned back to the roof covering. Broken tiles are set aside and matched from reclaimed stock where possible.

Fit the system

A ventilated roll or batten section is laid along the apex, then each ridge tile is screwed down through a fixing bracket or a union with a concealed clamp.

Verge and finish

Dry verge units clip over the barge and lock the edge tiles down. We photograph the finished line from the scaffold before it comes down.

What it typically costs

Job	Typical range
Ridge re-bed in mortar Full ridge line on a mid terrace, stripped and re-bedded, access included	£750 to £1,700
Dry ridge conversion, mid terrace Full ridge line stripped and converted to a mechanically fixed ventilated system	£850 to £1,900
Dry ridge, per linear metre Supply and fit on a straightforward run, excluding scaffold	£45 to £90
Dry verge, per linear metre Clip on units along a gable, including removal of old mortar bedding	£30 to £65
Hip line conversion Dry hip system with a ridge roll and mechanical fixings, per hip	£55 to £110 per metre
Replacement ridge tiles Where existing tiles are cracked, plus reclaimed matching on older stone and clay	£18 to £55 each

Typical ranges for Leeds and the surrounding area , reviewed September 2026. Every quote is written and fixed before work starts.