Wall insulation in Upton
These houses were built to leak air and have since been sealed up, so the ventilation has to be part of any wall job rather than an afterthought.
The site visit is free and so is the written itemised quote. Thomas Hannen prices every job himself.
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Most Upton houses have a cavity that can be filled once a borescope shows it clear and dry, but the ventilation has to be sorted alongside it. Over half the housing in Upton dates from between the war and the early eighties, and it was built to leak air. Replacement windows and doors have since sealed most of it up. Insulate the walls of a house in that state while ignoring the ventilation and you hand it a mould problem it never used to have.
The symptoms in Upton track that story almost exactly. Windows streaming in a bedroom that behaved for twenty years. Black spotting in the corner behind a wardrobe. A wall filled a decade ago in a house draught proofed from roof to floor ever since.
Wall and air therefore get read together on the same visit. A borescope goes through one small drilled hole in a mortar joint, moisture readings go on the inside face, and every vent, fan and air brick on the property gets checked. The free written itemised quote that follows keeps survey, system, junctions, ventilation work and making good on separate lines. For the loft, see insulation in Upton.
The work
The wall, and the air that has to leave the house
Failure one: the house gets warmer and damper at the same time. Cooking, washing and breathing put moisture into the air all day. A sixties house shifted it outdoors through gaps nobody designed on purpose.
Seal those gaps in an Upton house, warm the walls, change nothing else, and that moisture stays indoors looking for the coldest surface left. Which is why trickle vents in the frames, a kitchen and bathroom extract fan that genuinely moves air rather than humming at it, and any air brick lost behind render or a bag of sand are quoted with the boards and not after them. Approved Document F sets what a home needs.
Failure two: a wall gets filled that should have been left. Render hides everything. A nine inch solid wall and an early brick and block cavity present the same face to the street, so we drill and scope before a system is named: gap or not, what width, clean or fouled, dry or damp, empty or not. Around Upton the cavity is usually present and usually empty. Usually is not a survey.
Failure three: a cold stripe across the top of the wall, ten winters on. That is fill that has slumped, and it is why the material and the pattern matter. Bonded polystyrene bead flows to the corners of a clear, dry cavity and stays put, which suits an elevation facing the water. Blown mineral wool remains a sound answer where a wall sits sheltered. Holes are drilled to a set pattern and made good in matching mortar. An ordinary house takes a day.
Failure four: a lined room, warm in the middle, black at the edges. That is internal wall insulation fitted without its junctions. IWI itself is straightforward, whether insulated plasterboard bonded on or batten and stud packed with mineral wool or PIR, then boarded and skimmed, with Celotex and Kingspan giving more per millimetre and aerogel board suiting a room that has none to spare. What decides the outcome is whether reveals, threshold, floor junction and joist ends were wrapped, because heat in a lined room leaves at the edges and mould follows it there.
Failure five: vents buried under an external system. External wall insulation puts board on the outer face with a render carrier and thin coat over it, wraps the building in one operation and lifts the thermal bridge out at eaves and corners. Every reveal thickens. Every vent and extract terminal has to be extended out through the new face rather than entombed behind it, and on a house that already needs more airflow, not less, that detail is worth reading on any quote you are given.
Failure six: condensation where nobody can see it. A wet cavity carries penetrating damp inside and black mould arrives behind it; the borescope reads that and extraction comes before any refill. Beyond it sits the invisible version. Insulating shifts the dew point into the build up, so a taped vapour control layer and breathable materials keep interstitial condensation out of the fabric rather than letting it collect there quietly.
How it runs
Filling or lining the walls of an Upton house
Thomas comes out and checks what kind of wall you have before anyone talks about a system. Most Upton homes were built with a cavity, but some were filled years ago and some never were, and the few pre-1919 houses have solid walls. A borescope through a small drilled hole settles it.
The quote lists the survey and borescope check, the system and its thickness, making good around windows and doors, ventilation works and disposal. Any fill is put in by a registered installer and should carry a CIGA certificate.
Cavity fill is drilled and injected from outside, and the holes are filled to match the mortar. Internal lining goes room by room, with furniture moved and floors covered. If the cavity turns out to hold rubble, or old fill that has got wet, you get a photograph and a price before the plan changes.
Lining the inside of a wall needs no application, as Planning Portal guidance on insulation confirms, and Planning Portal guidance on external walls covers the outside face. There is no conservation area over Upton and only a few listed entries, and Dorset Council's listed building pages are where to check. It is notifiable work: regulation 23 means a renovated thermal element has to reach the Part L standard in Approved Document L, and building control take the U value and the ventilation together.
Cost
What decides the cost of insulating Upton's walls
We do not quote per square metre. The main area of wall is quick; the windows, doors and junctions are not.
Which wall. An empty, dry cavity can be filled in a day. A solid wall cannot be filled and has to be lined inside or insulated outside, which is a different job at a different price. We do not quote before the borescope check.
Getting to it. A seventies terrace, a bungalow with a conservatory across the back, and a detached house near the water each set up differently. Cavity fill is drilled from outside, so a bungalow works off a tower and a two storey gable needs a platform under the work at height rules. Internal lining happens indoors, so it is your rooms that are disturbed.
Exposure. A wall facing open water takes more driven rain, and a cavity that gets wet should not be filled with anything that will carry the water across.
The junctions. Reveals, the floor junction, the eaves and any party wall are where heat leaks and condensation appears if the detail is wrong. That is slow work, and the first thing a cheap quote misses.
Ask others whether the wall has been checked with a borescope, what system and thickness, how the reveals and floor junction are handled, whether ventilation is covered, and who makes good the plaster and decoration.
If damp has appeared
Damp or mould after the walls were insulated
Ring; the form is slower. Damp patches or black mould on an outside wall after cavity fill or lining usually come from water tracking across the cavity, or warm air reaching a cold surface at a junction.
We look before we take anything out, because the fix depends on which it is. The first visit checks the outside face, the gutters above and the fill itself through a borescope. Wall insulation is booked Monday to Friday, 8am to 6pm. If the mould is spreading, phone us, and we return missed calls as soon as we can.
Worth knowing
These houses were built to breathe, then sealed up
Picture the house as it was delivered in about 1970. Single glazed timber windows. A suspended floor with air bricks breathing under it. An open flue in the living room. Doors that never quite shut. Efficient it was not, but all of that moved air, and the moisture a family makes every day left the building without anyone giving it a thought.
Thirty years of sensible improvements have closed every one of those routes. Windows replaced, flue blocked, doors sealing properly, and a good number of air bricks quietly disappeared behind a new path or a coat of render. Insulate the walls over the top of all that and you take away the last of the draughts while making the inside surfaces warmer, which sounds entirely good and is only half the story. The moisture is still being produced. It still has to condense somewhere. It picks whatever surface is coldest, and in this stock that means a window reveal, the corner behind a wardrobe or the cold bridge down at a floor junction. Hence vents and fans quoted alongside the boards rather than bolted on later, and hence a wall quote carrying no ventilation line being a quote worth asking about.
Who you are dealing with
Who checks and insulates your walls
We cover Upton, Lytchett Minster, the Blandford Road side and the BH16 addresses around them, 8.5 miles from our base in Boscombe. Dorset Council handles planning and building control here, and it is building control that has to be told about wall insulation.
The business is Bournemouth Roofing & Building Ltd, registered in England and Wales, company number 15471719. It belongs to Thomas Hannen, who looks at your walls and prices the work himself. A verified customer rated us 10 out of 10 on Checkatrade. Neither the survey visit nor the itemised quote costs anything. Before you book a visit in Upton, you can read our customers' Google reviews, word for word, on our reviews page.
Planning at a glance
Do you need planning permission in Upton?
Most repairs in Upton need no application at all. What decides whether a change to the outside of your house does is who the council is, whether a conservation area or a listing applies, and whether the place sits in a protected landscape.
| Question | In Upton |
|---|---|
| Who decides | Dorset Council is the planning authority for Upton. Dorset Council's heritage pages set out what it controls. |
| Conservation area | None covers Upton, so a like-for-like repair is ordinary maintenance. |
| Listed buildings | Yes, there are listed buildings in and around Upton. If yours is one, work can need listed building consent. |
| Protected landscape | No National Park or National Landscape covers Upton. |
Questions
Questions about wall insulation in Upton
Why is ventilation on a wall insulation quote at all?
Because insulating the walls takes away the last of the draughts. The moisture a household makes still has to get out of the building, and when it cannot, it condenses on whatever surface has been left coldest.
My windows stream since they were replaced. Is that the walls?
Partly: frames fitted without trickle vents seal the house, and warm damp air then goes hunting for the coldest glass or the coldest corner. Vents plus a decent extract fan usually settle it.
Should I unblock the air bricks under the floor?
Yes. They ventilate the floor void, and blocking one to tidy up a path or finish a render neatly is a common reason for a musty smell and a damp floor in the room above.
Will a dehumidifier fix condensation instead?
It treats the symptom for as long as it is switched on. Getting moist air out of the building and getting the cold surfaces warmer is what stops the problem returning.
How long does it take to fit vents and fans with the wall work?
Roughly a day alongside everything else. Small in the scheme of the job, and the part that decides whether insulating the walls leaves the house better or worse than it was.
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Free quote
Get the walls and the ventilation priced together
Thomas comes out, scopes the cavity, checks the vents and the fans and prices the whole thing in writing. The visit and the quote are free.