Wall insulation in Owermoigne

Establishing the wall comes first. On an Owermoigne house, reveal depth and brick bond give the first opinion, the borescope gives the fact. Cavity or not, how wide, clean or bridged with mortar, dry or a wet cavity, empty or already filled and slumped. Where there is a sound cavity the whole discussion stops there, because a fill beats either alternative.

Cavity fill. In Owermoigne, bonded bead suits a narrow, obstructed or weather facing brick and block wall; blown mineral wool for a wide, clean, sheltered one. Drilled from outside on a grid, blown in, holes pointed to match. One day, the shortest payback of anything here, with Part L setting what the finished wall should reach.

External wall insulation. Board bonded and mechanically fixed to the outside, a mesh reinforced basecoat over it, then a silicone topcoat or a render carrier with a traditional finish. It gives the best U value, keeps your room sizes, keeps the masonry warm and dry, and it is the only one of the two that deals with the thermal bridge at the eaves and at the joist ends. It also takes the sills, the pipework, the meter boxes and the verges with it, and it needs a scaffold.

Internal wall insulation. Insulated plasterboard or PIR such as Celotex or Kingspan on a batten or stud frame with taped joints and a continuous vapour control layer, or wood fibre and lime where the wall is old and must stay breathable so the dew point lands somewhere that can dry. Cheaper, done room by room, and no scaffold, but it costs you 60 to 100mm a wall and it leaves the joist ends and the eaves cold unless they are detailed.

How we would actually choose. If the outside finish is already render and the eaves overhang is generous, external is usually the better building answer. If the house is faced in good brick or flint that would be a shame to bury, if the overhang is tight, or if you only want two cold rooms sorted, internal wins. We say which we would do and why, in writing.

Reveals and junctions. Whichever route, the reveals, the threshold, the floor junction, the eaves and the joist ends are where the cold bridges and the black mould live. Shallow reveals take an aerogel laminate. On an external system the reveals are wrapped in a thinner board so the window is not swallowed.

Ventilation. Trickle vents, extract fans that shift air and air bricks kept clear, to the rates in Approved Document F. Airtightness without ventilation trades a cold house for a damp one.

Failures. Fill that has slumped and left a cold band under the eaves, a wet cavity, render that is cracking and drumming, a lining fitted with no vapour control layer and now black behind. It comes out, the wall is dried, and you get a straight view on doing it again.

Thomas looks at the walls himself and works out whether they are cavity or solid, using a borescope through a single small hole to look into a cavity. The quote separates the survey with a borescope check, which system and at what thickness, making good at windows and doors, ventilation, and disposal. If a cavity fill is right, it goes in through a registered installer with a CIGA certificate.

Cavity fill is drilled from outside, then the holes are filled to match the mortar. Internal lining goes in room by room with insulated plasterboard or a breathable board, so furniture is shifted, floors sheeted and the room cleaned at the end of the day. External insulation needs a scaffold for the whole job. Rubble bridging the cavity shows up on the borescope, and we photograph it and price clearing it before any fill goes in.

Owermoigne's historic core is a designated conservation area. Within it, putting insulation on the outside face alters the look of the house, so an application is needed; outside it, on an unlisted house, it is usually allowed, and the rules on external walls set out the limits. Listed buildings need consent for internal work as well, under section 7 of the 1990 Act, and Dorset Council holds the designation records. Regulation 23 brings building control in once more than half a wall is renovated.

If an outside wall has gone damp or grown black mould since it was filled or lined, there are usually two suspects: water crossing the cavity, or warm air reaching a cold spot at a junction.

Send a photo of the outside of the wall as well as the damp patch, because the cause is often visible from outside. Then phone us. When we come out, we check it with a moisture meter and find out which it is before anything is taken out. Planned work is Monday to Friday, 8am to 6pm. If it will not wait, ring rather than use the form, and if we miss you, a call comes back as soon as we can.

Call now: 07435 839745

Nearly every village on this side of Dorset has a conservation area over its centre, and inside one of those the outside of your wall is not simply yours to change. Owermoigne's covers only the small historic core, and that is genuinely useful to know before you get quotes.

Outside that core, external wall insulation on an ordinary house is a normal building job rather than a planning fight, and it is the better technical answer more often than people realise.

The reason is what it does at the edges. An internal lining warms the face of the wall but leaves the joist ends, the eaves and the party wall on the cold side of the insulation, so those become the strips where condensation collects. An external system wraps the whole thing, keeps the masonry warm and dry, and leaves the rooms the size they were. The cost is that it changes how the house looks and it needs a scaffold, so it makes most sense where the wall is already rendered.

There are exceptions and they matter. There are listed buildings in Owermoigne, and on those consent is needed for work inside as well as out, so the easy answer stops applying. And on a house with good facing brick or flint, burying it under render is a decision you cannot undo, whatever the U value says. We will tell you which category you are in on the first visit.

Nearby places we also cover for wall insulation, with straight-line distances from Owermoigne, and the other trades we offer in Owermoigne itself.

Everything we do in Wareham Wall insulation, all areas Every area we cover