Wall insulation in Spetisbury

The borescope check comes first. One small hole, a camera, and a straight answer about what you have. Clear, dry and wide enough is a fill. Bridged with mortar, already wet, or too narrow is not. Nobody can read that from the pavement and no honest quote is written without it.

Stopping the fill at the party wall. On a Spetisbury semi or terrace the cavity often runs past the party wall into next door. A fill has to be contained, either at an existing cavity barrier or by forming one, so your material stays where you paid for it and does not end up in a neighbour's wall. Where work touches the shared structure, the party wall rules tell you what notice is owed.

Bead and mineral wool. Bonded polystyrene bead is blown through a drilled pattern and sets so it cannot settle later. Blown mineral wool is water repellent and long established, and is a fair choice on a sheltered wall with a sound outer leaf. Holes are made good in a matched mortar and a house is normally a day.

Solid walls. The older cottages in Spetisbury were built before the cavity became standard. A nine inch brick wall has nothing in it to fill, and injecting one achieves nothing. The choice is internal wall insulation or external wall insulation.

Internal wall insulation. Insulated plasterboard bonded and fixed to a flat Spetisbury wall, or PIR board such as Celotex or Kingspan between battens or a stud, then boarded and skimmed. Radiators, sockets and skirtings come off and go back. On a wall that must breathe we build in wood fibre and lime instead of a vapour tight sandwich, so moisture can leave rather than stall in the build up.

External wall insulation. Board mechanically fixed outside, a render carrier and mesh over it, then a through coloured finish. It keeps the masonry warm, so interstitial condensation has nowhere to form, and it costs no floor area. It changes the appearance of the house entirely.

Junctions. Reveals at windows and doors, the threshold, the floor junction, the eaves and the joist ends built into a Spetisbury wall. A shallow reveal takes a thin aerogel board. Skip these and you have made a cold bridge, and a thermal bridge is where the dew point lands and black mould starts.

Failed fill and ventilation. A fill that has slumped or wetted up is extracted through drilled holes and the cavity dried. Then trickle vents, a working extract and air bricks kept clear, because Approved Document F expects a tighter house to still be able to breathe.

Thomas looks at the brickwork, drills one small test hole where it is needed, and puts a borescope in to see whether the cavity is empty, part filled or solid. He prices it himself. His quote covers that survey, the insulation chosen and how thick it is, the making good at reveals, sills and door frames, any extra ventilation, and taking away the waste. A fill should be installed by a registered installer and carry a CIGA certificate.

Newer houses in the village usually have a cavity, and some may have been filled years ago. Cavity fill is blown in from outside through small holes, which are then made good to match the mortar. The older cottages on the main road have solid walls, and there the answer is insulated plasterboard fixed inside, a room at a time, with sockets, skirting and window boards refitted. Floors are protected and the rooms cleaned daily. If we find a damp cavity or rusting wall ties, the photo and the extra cost come to you before any more drilling.

Dorset Council is the authority. Fixing insulation to the inside face of a wall is not development, as the Planning Portal confirms, while cladding the outside changes how the house looks and may need permission. Spetisbury has no conservation area, yet a listed house needs consent even for internal lining. Renovating a wall brings in regulation 23, and Part L sets the U-value it has to reach.

If damp patches or mould appear on an outside wall after a cavity was filled or a wall was lined, do not paint over them. Wipe the mould, air the room, and note where the patch sits: by a window, at floor level, or near the party wall.

That tells us whether rain is crossing the cavity or warm air is meeting a cold spot. The first visit uses a borescope and a moisture meter to find the cause before anything is taken out. Planned jobs run Monday to Friday, 8am to 6pm. If it is spreading fast, phone rather than using the form. Leave a message if we are up a ladder, and we return the call as soon as we are down.

Call now: 07435 839745

Where a Spetisbury home is semi detached or terraced, it behaves differently from a detached one. The party wall itself loses you almost nothing, because there is a heated house on the other side of it. The problem is where that wall meets the outside wall, at the corner of the room. Masonry carries heat sideways, and that junction is often the coldest line in an otherwise warm room.

It is why the damp in a semi so often turns up in one corner rather than across a whole wall. A cavity fill in the outer wall does nothing for that corner, because the cold is coming through the return of the party wall rather than through the field of the outside one. The fix is a small internal lining returned along the party wall for a short distance, which breaks the thermal bridge and moves the dew point off the plaster.

The second thing is containment. Cavities frequently run straight past the party wall, and blowing a fill in without stopping it means paying to insulate somebody else's wall and leaving your own gable short. The survey checks for a barrier, and one has to be formed where there is none.

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

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