Wall insulation in Hyde
Water coming off the escarpment keeps the foot of a wall damp, and that is exactly where a badly detailed lining goes wrong first.
The site visit is free and so is the written itemised quote. Thomas Hannen prices every job himself.
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Older walls around Hyde are mostly solid and are lined inside, while a newer house may have a cavity a borescope can check for a fill; either way the damp at the base comes first. Insulating a wall makes the masonry behind the lining colder. If the bottom of that wall is already taking water off the ground, colder means wetter, and the first thing to suffer is the plaster at skirting level and any timber built in near it. So on these lanes we look at the foot of the wall before we look at anything else.
The usual problems are a cold room on the weather side, mould appearing along the bottom of an outside wall, or a straightforward question about whether the cavity in a newer house is worth filling.
The visit settles what the wall is and what is happening at its base. Thickness and construction, one drilled hole and a borescope where a cavity is possible, the state of the render or pointing, whether the ground has crept up above the damp course, and where the floor joists sit. Then a written itemised quote with the survey, the system, the junctions and the ventilation on separate lines. The visit and the quote are free, and insulation in Hyde covers the loft and floors.
The work on these walls
Walls, linings, and getting the bottom right
Finding out what the wall is. Rendered, a nine inch solid wall and a brick and block cavity wall are hard to tell apart from the road. A borescope through one hole shows whether there is a cavity, how wide it is, whether it is clear and dry, and whether an old fill has failed and slumped into the bottom of it.
Cavity fill. Bonded polystyrene bead blown through a drilled pattern, or blown mineral wool where the wall is sheltered and the outer leaf sound. A wet cavity in Hyde is not filled, and neither is one bridged with mortar or fed by an outer leaf that is cracking or blown. Holes are made good in a matched mortar and a house is normally a day.
Internal wall insulation. Insulated plasterboard bonded and fixed to a flat Hyde wall, or PIR board such as Celotex or Kingspan between battens or a timber stud, then boarded and skimmed. On an older wall that has to stay breathable we build it in wood fibre and lime instead, so vapour can pass rather than stall behind a sealed face.
The floor junction. This is the detail on these Hyde walls. The lining has to be taken down properly and stopped with a capillary break rather than simply run into a damp skirting, and where the base of the wall is wet a vapour open build up and a lime plaster low down give it somewhere to dry. Gypsum board sitting in damp is a mould problem waiting to start.
External wall insulation. Board, a render carrier and mesh, then a through coloured finish, with a proper stop and a drip well clear of the ground on a Hyde house. It keeps the masonry warm so interstitial condensation has nowhere to form, but here it is a conservation area application before it is a technical decision.
The other junctions. Reveals at windows and doors, the threshold, the eaves, the joist ends and any party wall in a Hyde house. A shallow reveal takes a thin aerogel board. Miss one and you have made a cold bridge, and a thermal bridge is where the dew point lands and black mould appears.
Ventilation and air bricks. Trickle vents, a working extract in the kitchen and bathroom, and air bricks on a Hyde house kept clear and above the wet, which Approved Document F expects. Blocking an air brick to stop a draught is how a dry underfloor void turns damp.
How it runs
Finding out what your walls are before insulating them
Before quoting, Thomas finds out what the walls actually are. A cavity wall gets a look through a borescope in one small drilled hole. A solid wall gets checked for damp at the base first, as lining a wall that is already wet at the bottom only hides the problem. Then the quote sets out the survey, the system and its thickness, ventilation, making good round the openings, and clearing up.
Cavity fill goes in from outside through small holes, put in by a registered installer with a CIGA certificate, which are then filled to match. Lining inside a Hyde house is done room by room, furniture shifted and floors sheeted. Offcuts go with us. If we find damp at a reveal or a blocked cavity, you are told, and shown a photo with a price, before work continues.
Because the NPA, not a district council, decides planning here, anything that changes the outside face gets close attention. Hyde lies inside the Western Escarpment Conservation Area, which tightens things further. The NPA's interactive property map shows what applies, and its heritage pages cover consent, which on a listed building reaches inside as well. Renovating a thermal element brings building control in under regulation 23, and Part L then sets the U-value to reach.
Cost
Cavity, solid wall or lining: how wall insulation is priced
The plain face of a wall goes quickly. The cost sits in the wall's make-up and in its edges. Cavity or solid. A cottage sitting low beside the lane, a post-war house built with a cavity, and a rendered extension at the back are three separate jobs. A dry, empty cavity is usually a short job to fill. A solid wall has nothing to fill, so it is lined inside or insulated outside. The borescope shows which you have.
The foot of the wall. If soil is banked up against a solid wall, the damp at its base is sorted first, by dropping the ground level or freeing a blocked drain. A breathable lining, wood fibre under lime plaster for instance, lets the wall dry out; a foil-faced board can seal the moisture in. The British Standard on managing moisture in buildings is the reference.
Getting up there. A bungalow cavity is drilled from a tower and a taller gable from a scaffold, as the work at height rules require. Lining inside needs no platform, but each room is out of use while it is done.
Openings and corners. Heat slips out, and mould tends to start, around window and door openings, along the join with the floor, up at the eaves and beside a shared wall. Detailing those takes time, which is why a low price often leaves it out.
Ask others if they have actually seen inside the wall, what they would fit and how thick, how the openings and floor edge will be finished, and whether the redecoration afterwards is in the price.
If damp has appeared
Damp patches since the walls were insulated
Damp or black mould on an outside wall after the wall was filled or lined is a reason to phone rather than use the form. Either rain is tracking over the cavity by way of the fill, or warm indoor air is hitting a cold spot at a junction, and each needs a different fix.
Tell us how far up the wall the mark goes: a stain that stops a short way above the skirting points one way, one that starts at the ceiling another. The first visit finds the cause before anything is removed. Scheduled work is Monday to Friday, 8am to 6pm. Something that cannot wait is worth a phone call, and if it rings out, leave a message and we will phone back.
Worth knowing
Why the foot of the wall decides the job
The ground here sheds water fast. Rain off the escarpment finds the lanes and the yards, and a house on lower ground can see water gather against its walls after heavy rain.
What that means at a house is splash, standing water against the base of a wall, and ground that has often been built up over the years until it sits above the original damp course. The flood risk service will show you what applies at your address.
A wall in that position is already carrying moisture at the bottom, and it copes because it dries inwards into a heated room. Line the inside face and you take that away. The masonry behind the board is colder, it holds more water, and the only place moisture can gather is at the back of the lining where it meets the floor.
So the build up at the bottom is not a detail, it is the job. A capillary break under the lining, a vapour open board and a lime plaster in the lowest part of the wall, the ground outside cut back and drained away from the house where that is possible, and the air bricks kept clear and above the wet. Get that right and a lining works here. Screw insulated plasterboard straight down to a damp skirting and you will be washing mould off it within two winters.
Who you are dealing with
The owner surveys your walls, from Boscombe
Hyde is 12.7 miles from our Boscombe base, and we cover the village, Frogham, Godshill and the lanes around Fordingbridge, broadly SP6, where planning is decided by the National Park Authority. The work is done by Bournemouth Roofing & Building Ltd, registered in England and Wales, company number 15471719. Before you book a visit in Hyde, you can read our customers' Google reviews, word for word, on our reviews page.
The survey and the borescope check are done by the owner, Thomas Hannen, who then prices the work. Checkatrade lists a verified customer's 10 out of 10. The survey visit and the written quote, set out line by line, are free.
Planning at a glance
Do you need planning permission in Hyde?
Most repairs in Hyde 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 Hyde |
|---|---|
| Who decides | New Forest National Park Authority is the planning authority for Hyde. New Forest National Park Authority's heritage pages set out what it controls. |
| Conservation area | Yes: Western Escarpment Conservation Area. Check whether your street is inside the boundary before changing anything visible. |
| Listed buildings | Yes, there are listed buildings in and around Hyde. If yours is one, work can need listed building consent. |
| Protected landscape | Inside the New Forest National Park, where design is looked at more closely and permitted development rights are narrower. |
Questions
Questions about wall insulation in Hyde
Can a wall that gets damp at the bottom still be insulated?
Usually yes, but not with a sealed board taken down to the floor. It wants a capillary break, a vapour open build up low down and the ground outside dealt with at the same time.
Should the ground outside be lowered before we insulate?
Where it has crept above the damp course, yes. Cutting it back and getting the water away does more for a damp wall than any thickness of insulation will.
Is the National Park the planning authority for my house?
In this parish it is, not the district council. The NPA's property map will tell you exactly what applies to your address before you commit to anything.
Why does mould appear along the skirting rather than higher up?
Because that is the coldest and dampest part of the wall once it has been lined. It is nearly always a detailing fault at the floor junction instead of a lack of insulation.
Will insulating the walls save money?
It usually does, because heat loss through the walls is a large share of the total and the payback is genuine. We will not attach a figure to it, since that depends on how you heat the house.
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Wall insulation near Hyde
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Free quote
Get the foot of the wall looked at first
Thomas comes out, checks what the wall is and what is happening at its base, and prices the lining, the junctions and the ventilation in writing. Both are free.