Skylight Installation in Brightlingsea
- Fixed quote before we start
- Roof never left open overnight
- 10-year workmanship guarantee
- Fixed quote before we start
- 10 years workmanship guarantee
- 25 years fitting rooflights
- Skylights only, not a general roofer
Brightlingsea sits at the mouth of the Colne with nothing between its roofs and the open North Sea. That geography does one specific thing to a rooflight, and it is not what most people expect. The glass is rarely the problem. The unit is rarely the problem. What fails here is the weathering detail around the opening, the flashing, and it fails for reasons that have almost nothing to do with the quality of the window itself.
It is 17.8 miles from Ipswich in a straight line and about 45 to 50 minutes by road, because the route has to run round the head of the Colne rather than across it. That is a real drive, and we price it into the survey rather than pretending the town is closer than it is.
Why a flashing detail that holds inland lets water past here
A rooflight flashing kit works on gravity and overlap. Water lands on the glass, runs down to the apron, crosses onto the covering below, and leaves. Side flashings channel run-off past the frame. The head flashing sits under the covering above so anything coming down the slope passes over it rather than behind it. Nothing is sealed watertight in the way people imagine. It is a sequence of laps, each arranged so water can only travel one way.
That whole arrangement assumes water is falling downwards. On a sustained onshore blow at Brightlingsea, it is not. Driven rain arrives with a horizontal component strong enough to push water up a lap, and it does not arrive for ten minutes. It arrives for six hours. Capillary action does the rest, drawing moisture into the overlap and holding it there long enough to find a route across the deck. A 100mm lap that sheds everything on an inland Suffolk roof is simply not deep enough at the mouth of an estuary.
The other half of the problem is pressure. Wind crossing a roof plane creates a negative pressure zone downwind of any raised object, and a rooflight is a raised object. Water sitting at the side flashing gets lifted, not just pushed. That is why coastal failures tend to appear at the top corners of the unit rather than the bottom, which confounds people.
The sequence matters more than the parts
Flashing goes in in a strict order and every step depends on the one before it. Underfelt collar first, dressed into the opening and lapped onto the existing underlay so the secondary drainage layer stays continuous. Then the apron, dressed down into the covering. Then the side sections, each lapping over the apron. Head flashing last, tucked under the covering above.
Get one of those out of order and the assembly still looks right from the ground. It photographs fine. It holds for a couple of years, because ordinary rain does not test it. Then a March easterly blows for two days straight, water tracks in behind a lap fitted the wrong way round, and by the time it shows on a ceiling it has been running across a rafter for a fortnight.
What coastal spec means on a Brightlingsea job: marine-grade 316L stainless fixings as standard, marine-specification powder coating on any aluminium, deeper laps than the standard kit dimension, and the underfelt collar lapped and taped rather than trusted to sit where it lands. Standard A2 stainless pits here. You see it as rust weeping at fixing points within a few winters.
Slate, pantile, and why the covering changes the detail
Brightlingsea stock is mixed. Period property around the quayside, much of it slate or clay pantile. Twentieth-century estate housing further back, largely concrete interlocking tile. Those coverings need different flashing approaches and the kits are not interchangeable.
- Slate. Flat covering, so a flat-profile flashing seats properly, but slate is brittle and the surrounding slates have to be lifted and relaid rather than levered. Old nails snap. We expect to replace some.
- Clay pantile. A pronounced roll, so the apron has to be a corrugated profile that dresses down into the trough. A flat skirt bridges the roll and leaves a channel straight into the roof. Sealant does not close it, it only postpones it.
- Concrete interlocking. Deep profile, heavy, and the flashing skirt needs enough depth to reach the tile below without straining.
We measure the covering at survey and order the kit to match it. That is a small thing that decides whether the job lasts twenty years or five.
Replacement, not patching
When a coastal rooflight starts letting water past, the flashing is rarely the only thing gone. Fixings will have corroded, the seal edge has taken UV and salt for years, and the timber under the upstand may be soft. We do not reseal or patch. We take the unit out, inspect the structure, and fit a new one specified for the exposure.
Common work here includes pitched roof skylight installation on the older stock, flat roof rooflight installation on rear extensions, VELUX, Keylite and Roto units, and roof lanterns where a kitchen extension can carry one.
Brightlingsea stock, from the Hard to the new waterfront
Brightlingsea is a working maritime town at the mouth of the Colne, and its roofline carries that history. Around the Hard and the older streets there is Victorian and Edwardian quayside property, much of it slate or clay pantile, built close and built to face the water. Behind and around it sit twentieth-century estates on concrete interlocking tile, and along the waterfront newer development has gone up on the sites of the old shipbuilding and oyster trade. Three coverings, three different flashing approaches, and one shared exposure: the town looks straight out past Mersea and Point Clear to open water, and the wind that matters here is the sustained onshore blow that drives rain sideways for hours at a time.
That mixture is why a Brightlingsea survey starts by identifying the covering and the structure street by street rather than assuming. A slate roof near the quay and a concrete-tiled estate house half a mile inland are different jobs with different kits, and the failure this page describes, water driven up a flashing lap, plays out differently on each. The one constant is that the weathering detail, not the glass, is what a Brightlingsea installation lives or dies on.
Lap depth, capillary break and pressure
The heart of the coastal flashing problem is that a standard lap is sized for water running downhill under gravity. Here it does not. A sustained easterly drives rain up the slope with real velocity, and once water is moving uphill three things let it into the roof: too shallow a lap, capillary action drawing it into the overlap, and negative pressure lifting it at the downwind edge of the unit. We answer each in turn. Laps are set deeper than the standard kit dimension, so there is more overlap for the water to have to climb. Where the detail allows, a deliberate capillary break stops moisture wicking through the overlap the way it does between two close-fitted surfaces. And the underfelt collar is dressed, lapped and taped into a continuous secondary drainage layer, so anything that does get past the primary flashing lands on a surface that carries it back out over the covering below rather than into the rafter.
The pressure point is the one people find counter-intuitive, so it is worth repeating. Wind crossing a raised unit creates suction on its downwind side, which lifts water sitting at the side and head flashings. That is why coastal leaks so often appear at the top corners of a rooflight rather than the bottom, and why we pay most attention to exactly the corners a sheltered-site fitter treats as the safe ones.
The order the flashing goes on in matters as much as its depth, and it is where a rushed job fails without looking like it will. The underfelt collar goes first, dressed into the opening and lapped onto the existing underlay so the secondary drainage layer stays continuous. Then the apron, dressed down into the covering. Then the side sections, each lapping over the apron. The head flashing goes on last, tucked under the covering above. Get one of those out of sequence and the assembly still photographs perfectly from the ground and holds for a couple of years, because ordinary rain does not test it. Then a March easterly blows for two days straight, water tracks in behind a lap fitted the wrong way round, and by the time it shows on a ceiling it has been running across a rafter for a fortnight. On a coastal roof that sequence is the difference between twenty years and five, which is why we would rather take the covering back further than we strictly need to than leave a doubtful lap in place. It is slower on the day and it is the reason the work stays quiet through the winters that follow. On a town this open to the east, that patience at the flashing stage is worth more than any single component in the box.
Getting a price
Every skylight installation Brightlingsea job is surveyed on the roof and priced once in writing, with a 10-year workmanship guarantee and installation to current Building Regulations. Our installers have 25 years in the trade and the coastal detail is the part they argue about most.
We cover the same stretch of coast at St Osyth, Alresford and Wivenhoe. The full list is on areas we cover.
Request a fixed quote for Brightlingsea. Photographs of the roof from the garden and the room dimensions are enough for us to tell you what the exposure is likely to demand before anyone comes out.
Why do rooflights fail faster in Brightlingsea than a few miles inland?
Two reasons working together. Airborne chloride from the open sea attacks fixings and coatings, so standard A2 stainless pits and powder coat chalks and lifts years earlier than it would inland. And sustained onshore wind drives rain horizontally into flashing laps that were designed on the assumption water falls downwards. A unit here is doing a harder job than the manufacturer literature assumes, so it reaches the end of its life earlier.
Can you just redo the flashing rather than replace the whole rooflight?
We do not offer repair or resealing. If the flashing has failed on a coastal roof, the fixings and the seal edge have been through the same weather and the timber below the upstand often has too. Opening it up to redo one element and putting the old unit back is buying a season. We replace the unit and the weathering detail together, specified for the exposure.
Will a rooflight work on an old slate roof near the quay?
Usually yes. Slate takes a flat-profile flashing well. The complications are age related rather than pitch related: old slates are brittle, fixing nails snap when disturbed, and battens near an exposed coastal eaves can be softer than they look. We check the structure at survey and tell you if slates need replacing before we quote, rather than discovering it on the day.
My rooflight leaks at the top corner, not the bottom. Does that make sense?
On this coast, yes, and it is a classic sign of driven rain rather than a simple gravity leak. Wind crossing the raised unit creates suction on its downwind side that lifts water sitting at the head and side flashings, and a sustained onshore blow drives that water up the laps and holds it there for hours. So the failure shows at the top corners, which people expect to be the safe ones. We set deeper laps and a taped continuous underfelt collar precisely to defend those corners.
Thinking about this job? We survey across Ipswich, Suffolk and north Essex and give you a fixed price before any work starts, with a 10-year workmanship guarantee.