Wall insulation in Milborne St Andrew

Settling what the wall is. Thickness at the reveal, the brick bond, the age of the house and the sound it makes when you tap it all give a hint. The borescope gives the answer: cavity or not, how wide, clear or bridged, dry or wet, and whether somebody has already filled it. It costs you nothing and it decides everything after it.

Filling a cavity. On a Milborne St Andrew cavity wall, holes are drilled on a grid in the mortar joints, the fill blown in, the holes pointed up to match. Bonded bead handles a narrow or awkward cavity and stays where it is put. Blown mineral wool is a good clean cavity material and a poor choice anywhere driven rain crosses the gap. A day for most houses, with the drill outside and nothing to move indoors.

The walls we refuse to fill. Wet cavities. Cavities bridged with mortar. Walls with no cavity trays over the openings. Anything under about 50mm. Filling those does not save heat, it just gives water a bridge to the inside face and the mould arrives the following winter.

Lining a solid wall from inside. Insulated plasterboard on a stud or batten frame, PIR such as Celotex or Kingspan where a Milborne St Andrew wall is sound modern brick, wood fibre and lime plaster where it is old and needs to breathe. Joints taped, the vapour control layer kept continuous, and the electrics moved out to the new face rather than buried behind it.

Insulating from outside. Board fixed and bonded to the wall, a mesh reinforced basecoat over it, then a silicone finish or a render carrier and a traditional topcoat. It gives the best U value and it does not shrink your rooms, but it takes the eaves, the verges, the sills and every pipe with it, so it is a bigger piece of work than it looks.

Reveals, floors and joist ends. Insulating the middle of a Milborne St Andrew wall and stopping at the window leaves a cold bridge round every opening, and that is exactly where the black mould grows. Reveals get a thin high performance board or an aerogel laminate, the floor junction gets carried down behind the skirting, and joist ends built into a solid wall are detailed so they can still breathe.

Ventilation. Every insulation job makes a Milborne St Andrew house tighter, and a tighter house needs a way out for moisture. Trickle vents, working extract fans, air bricks left clear. Approved Document F sets what is expected, and skipping it is how a warm house becomes a mouldy one.

Putting right what has failed. In a Milborne St Andrew house, slumped fill with an empty top metre, a wet cavity that needs clearing and drying, a lining that was fitted with no vapour control layer and is now black behind. It comes out, the wall is dried, and you get a straight view on whether it is worth doing again.

Thomas starts by finding out what your walls are made of. On a brick and block house he may drill a single small hole and look into the cavity with a borescope. On an older cottage he checks whether the walls are solid brick or stone, and whether they are damp already.

His quote covers that survey, the insulation system and its thickness, the work round window and door reveals, any new ventilation, and clearing up. A cavity fill has to be put in by a registered installer, with a CIGA certificate.

Cavity fill is injected through small holes drilled from outside, which are then pointed up to match. Internal lining goes room by room: skirtings, sockets and window boards come off and go back, so each room is out of use for a few days. Floors are sheeted, offcuts leave with us, and the house is swept at the end of each day. A damp problem that the new lining would cover up is shown to you in a photograph, priced, before we go on.

Insulating a wall internally is not development, which the Planning Portal's insulation guidance confirms. External wall insulation changes the outside face, and inside the Milborne St Andrew Conservation Area it counts as cladding and needs planning permission, so read the rules on external walls before you commit. On a listed building, consent covers both. Building control engages through regulation 23 when more than half an element is renovated, and Dorset Council is the authority.

Damp patches or mould on an outside wall after cavity fill or internal lining usually mean water is crossing the cavity, or warm air is meeting a cold spot at a junction. Keep the room aired, wipe the mould off, and photograph the patch inside and the same wall from outside.

Then ring instead of filling in the form. Wall insulation work runs Monday to Friday, 8am to 6pm, and if we miss your call we will get back to you as soon as we can. Nothing is taken out until we know which fault it is, because the fix depends on it.

Call now: 07435 839745

Milborne St Andrew has nearly thirty listed entries in the parish, and the thing that catches people out is that listed building consent is not about what the street can see. Section 7 of the 1990 Act covers any works affecting the character of a listed building, inside as much as outside. Dry lining a bedroom wall is works. So is losing a run of historic lime plaster behind a sheet of insulated plasterboard.

That is not a reason to give up on a cold cottage, it is a reason to design the job differently. Consent is far more likely for a reversible, breathable build up, wood fibre bedded in lime, than for a foil faced board screwed through the original plaster. Dorset Council publishes what is listed and how to apply on its listed buildings pages, and the conservation officer would far rather talk before the work than after it.

Where consent is not going to come, we say so. On a lot of these cottages the sensible money goes into the loft, the draughts round doors and floorboards, and secondary glazing, none of which touch the historic fabric and all of which cut the heat loss you actually feel.

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

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