Wall insulation in Barton on Sea
Seaward walls surveyed before anything is injected, failed fill extracted and inside linings detailed at the reveals, across Barton on Sea and BH25.
The site visit is free and so is the written itemised quote. Thomas Hannen prices every job himself.
On the clifftop at Barton on Sea, filling the cavity is not automatically the right answer. The seaward elevations here take driven rain as hard as anywhere in the county, and an empty cavity is the drainage gap that keeps that water off your inside wall. Fill a wall that is already letting water through the outer leaf and you have built a bridge for it.
So the first job is finding out how wet the outer leaf gets. People ring because a front room facing the sea has damp coming through after a gale, because a bungalow filled years ago is now colder at the top of the walls than the bottom, or because mould keeps returning in a corner however often it is washed off.
We survey before we sell anything: a borescope through one drilled hole, a look at the pointing and the sills, and an honest answer. Free visit, free written itemised quote.
The work
Walls that face the sea, and what suits them
The survey, and the borescope. One hole in a mortar joint on the exposed elevation tells us the cavity width, whether it is already filled, and whether the inner face of the outer leaf is running wet. Most of Barton is late 1950s and early 1960s brick and block with a nominal 50mm cavity, and on the seaward side that gap is doing a job.
When we say do not fill it. Cracked or hollow render, open joints, failed sills, or a wet outer leaf on the survey, and the answer is no fill until the outside is put right. A wall in a severe wind driven rain exposure needs its cavity clear, and BS 8104 is the code of practice used to work out which category a wall sits in. Where the exposure is severe, a full fill can be the wrong product whatever the wall looks like from the pavement.
Cavity fill where the wall is sound. Sheltered elevations, and houses set back from the cliff, take bonded polystyrene bead or blown mineral wool. Bead is water shedding and does not slump, which is why we use it near the front rather than fibre. Drilled on a pattern, injected under control, eaves and reveals closed off first, holes made good.
Failed and slumped fill. Plenty of Barton was filled in the grant years and a lot has settled. The camera shows an empty band at the top and a compacted mass below, or wet fibre on the weather side. Extraction, a clean out, then a refill in bead or a cavity left empty on purpose.
Internal wall insulation. Where the cavity has to stay clear, the warmth comes from inside: insulated plasterboard fixed back, or a stud and batten frame with mineral wool or PIR board such as Celotex or Kingspan between it. Reveals returned with a thin aerogel backed board, the floor junction carried down, joist ends dealt with, and a vapour control layer taped so the dew point cannot sit in the build up as interstitial condensation.
External wall insulation. Boards, a render carrier and a thin coat finish outside. It cures cold bridging and takes the most heat loss out of a bungalow of anything here, but on an exposed elevation the finish and the detailing at sills and eaves have to be specified for the weather.
Ventilation. Extract in the kitchen and bathroom, trickle vents in the windows and air bricks kept clear. Tightening a house up and leaving the ventilation as it was is the reliable way to turn a cold wall into a mouldy one; Approved Document F sets the standard.
How it runs
From your call to a written price
Same team from first visit to last, one person to ring, and no sub-contracting your work out to somebody you have never met. The quote is itemised, not a figure on the back of a card: the survey and any borescope check, the system and its thickness, making good around windows and doors, ventilation works, and disposal on separate lines, so you can compare it properly against anyone else's.
Nothing is left open or unusable overnight. The site is swept at the end of each day rather than the end of the job, and what comes out leaves with us. If something turns up once we start that nobody could have seen, you get a photograph and a price before we carry on.
New Forest District Council is the planning authority, Barton sits outside the National Park boundary, there is no conservation area over the housing and only two listed entries, so most addresses have nothing to apply for. Internal lining needs no permission, which the Planning Portal page on insulation confirms. External wall insulation changes the appearance and can need an application, covered by the Planning Portal guidance on external walls. Building control applies either way: regulation 23 treats a renovated wall as a thermal element that has to reach the Part L standard in Approved Document L, and the work is zero rated for VAT.
Cost
What decides the price of a wall insulation job
No rate per square metre, because the wall area is the easy part; what happens at every window, door and floor junction is not.
Getting to it. A clifftop bungalow, a rendered semi on Barton Court Avenue and a purpose built flat set back from the front are three different jobs. Cavity fill is drilled from outside and a bungalow comes off a tower where a three storey gable wants a scaffold. Internal lining is worked room by room from inside, so it is your rooms rather than a platform that gets disrupted. The work at height rules still set the platform.
Which wall you actually have. A cavity that is clear and dry can be filled in a day. A solid wall cannot be filled at all, and has to be lined inside or insulated outside, which is a different job at a different price. A borescope through one drilled hole settles it, and no honest quote is written before that.
The junctions, not the field of the wall. Reveals at windows and doors, the floor junction, the eaves and any party wall are where heat escapes and where condensation shows up if the detailing is wrong. That work is slow, it is most of the labour, and it is the first thing a cheap quote leaves out.
Comparing quotes? Ask whether the wall has actually been checked with a borescope or just assumed, what system and what thickness is specified, how the reveals and floor junction are being detailed, whether ventilation is being addressed, and who makes good the plaster and decoration afterwards. Two quotes for the same job are usually two different jobs.
If damp has appeared
Damp or mould after a wall was insulated
Ring rather than use the form. Damp patches or black mould appearing on an outside wall after cavity fill or internal lining usually means water is tracking across the cavity, or warm air is reaching a cold surface at a junction. We look before we take anything out, because the fix depends on which of those it is. Barton is under ten miles from us and we are along that coast most weeks. The phone is answered 24 hours for emergencies; scheduled work runs Monday to Friday, 8am to 6pm.
Worth knowing
Why the cavity on the seaward side is meant to be empty
A cavity wall was never only a thermal idea. It was a rain control idea. Water gets through a brick or rendered outer leaf more easily than people think, especially with wind driving it flat against the wall for hours. The cavity gives that water somewhere to run down and out through the weep holes, and the inner leaf stays dry because nothing connects the two but the ties.
A kilometre from the cliff edge, with the prevailing wind coming in off the water, Barton sits in one of the harder driving rain exposures in the area. Put a continuous material across that gap on a wall already taking water and it can carry the water to the inner leaf. The damp patch six months later gets blamed on rising damp or condensation when it is neither.
None of that means no wall in Barton can be filled. Plenty can, and where the outer leaf is sound and the exposure is moderate the U value improves sharply and the payback is short. It means the decision belongs to the survey and not to the postcode, and that on the front row the honest answer is sometimes to point the wall, sort the sills, deal with the draughts and insulate from the inside instead.
Who you are dealing with
A local firm you can check
We cover Barton on Sea, New Milton, Milford on Sea, Hordle and the BH25 addresses around them, with New Forest District Council for planning and building control. You are dealing with Bournemouth Roofing & Building, the trading name of Bournemouth Roofing & Building Ltd, registered in England and Wales, company number 15471719, which you can look up in a minute. Thomas Hannen's business, and he is the one who comes out to price the job, not a salesman. A verified customer's 10 out of 10 on Checkatrade. The visit and the written quote are both free.
Questions
Barton on Sea questions we get asked
Is cavity wall insulation a bad idea near the sea?
Not always, but it is a decision rather than a default. Where an elevation takes driven rain and the outer leaf is porous or cracked, filling the gap can carry water to the inner leaf. The survey settles it.
Our bungalow was filled in the 1980s. Should it come out?
Only if the camera says so. Fibre that has slumped or gone wet on the weather side is doing nothing useful and is holding damp, and that comes out. Fill that is dry and evenly distributed stays.
Damp appeared on our wall after the cavity was filled. Why?
Usually water tracking across the fill from a wet outer leaf, or a cold spot at a reveal where the cavity was not closed. Those look identical on the wall and need opposite fixes, so we look before removing anything.
Can we insulate from the inside instead?
Yes, and on the front row it is often the better answer. It leaves the cavity clear to drain and warms the room. The cost is 60 to 100mm off the wall and careful work at the reveals.
Does salt air affect wall insulation?
It affects the outer leaf rather than the insulation. Salt keeps masonry damp between showers, so the wall wets and dries more than it would inland. That is why the outside comes first, and why an EPC gain here starts with the pointing.
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Have the seaward wall looked at before you fill it
Thomas comes out, opens one small hole, sees whether the cavity is dry and tells you straight whether filling it is right for your elevation. Visit and quote both free.