Wall insulation in Stone

End gables, which are the cold ones. A house joined on both sides loses heat through two walls, a semi through three and a detached house through four. A gable has nothing warm on the other side of it, which is why it is usually the coldest wall and usually the one worth doing first.

Cavity fill, and cavity barriers. Where the borescope shows a cavity that is wide enough, clear of mortar snots and dry, it is drilled and filled from outside. In an attached house the cavity often runs on past the party wall, so a barrier goes in first or your bead ends up warming next door. That is standard practice and it is also a fire separation matter, not just a tidiness one.

Telling the neighbours, and the Act. Work to a shared wall itself, such as cutting into it, is party wall territory and the Party Wall etc. Act sets out the notice. Filling your own outer cavity is usually not, but where the cavity is continuous it is still worth a conversation before the drill comes out rather than afterwards.

Internal wall insulation, IWI. On solid brick in Stone, or where the cavity is too narrow, the lining goes inside: insulated plasterboard bonded to the masonry, or a batten and stud frame filled with mineral wool. PIR laminate such as Celotex or Kingspan gets there in the least depth, with the vapour control layer taped so warm air cannot get behind it, per BS 8000-8.

External wall insulation, EWI. Boards, a render carrier and a render finish. On an attached house it is rarely one owner's decision, because the system has to stop somewhere and one insulated house beside an unrendered neighbour looks exactly like what it is. Where neighbours go together it is the strongest option available.

Fill that has failed. Wool blown into a Stone wall years ago slumps and leaves a cold band under the eaves, which shows inside as black mould along the top of a wall. A wet cavity, where water crosses on a bridge, gives damp patches that follow the weather. Both begin with extraction, drilling and vacuuming the old material out, not with adding more.

Junctions, ventilation and draughts. Reveals, the threshold, the floor junction and the joist ends are where the heat loss is concentrated, and a thermal bridge left at any of them collects condensation whatever the u value beside it. Reveals take a thin board or aerogel. Then trickle vents, a working extract fan and clear air bricks, because airtightness without ventilation is how a warm house turns mouldy, and Approved Document F sets what is expected.

Cavity or solid sets the cost. Blowing fill into a clear, dry cavity is quick and barely touches the inside of the house. A solid cottage wall means insulated plasterboard on the inside or a system on the outside, and either is a much bigger job.

Attached houses. A house joined on both sides has only a front and a back to do; a semi or an end house adds a gable. Where the cavity is shared, the barrier at the party wall is a line of its own.

Reveals and junctions. Round windows and doors, where the floor meets the wall and up at the eaves, cold bridges form and condensation follows if the detail is skimped. It is fiddly, slow work and the part cheaper prices tend to drop.

Old fill. Fill from an earlier job that has slumped or soaked up water may have to be pulled out before anything new goes in.

Access. Drilling a two storey gable needs a tower; a taller or awkward wall needs a scaffold or a powered platform. The work at height rules decide which.

Ask other quotes whether anyone has actually looked inside the cavity, what U-value the finished wall reaches, how the reveals are being handled, and who puts the plaster right.

We cover Stone, Pamphill, Cowgrove and the Wimborne edge, broadly BH21. Stone is roughly nine miles from Boscombe, where our base is, and its planning and building control are handled by Dorset Council. We are Bournemouth Roofing & Building Ltd, registered in England and Wales with company number 15471719. Before you book a visit in Stone, you can read our customers' Google reviews, word for word, on our reviews page.

The company is owned by Thomas Hannen, who surveys the walls and prices the job personally. A verified customer's rating on Checkatrade is 10 out of 10. There is no charge for the survey visit or the written quote, itemised in full.

Most repairs in Stone 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.