Wall insulation in Crossways, nothing in the way

The survey, short as it is. Newer stock does not mean no survey. The camera settles the width, whether the cavity is clear, whether the inner leaf is dry and whether partial fill boards are already fitted against it. It takes ten minutes and it costs nothing.

Bonded bead. Polystyrene bead blown in with adhesive so it binds and stays put. It flows past obstructions, gets into a narrower gap and sheds water rather than holding it. It is what we specify on anything exposed and on anything under about 70mm.

Blown mineral wool. A good, cheaper option in a wide, clean, sheltered cavity, and there are plenty of those here. Its one weakness is water: where driven rain crosses the gap the fibre holds it against the inner leaf, so it is not for a weather facing gable.

Houses built with partial fill. From the mid 1970s a lot of builders fixed rigid boards against the inner leaf and left a clear gap in front. Blowing loose fill into that gap bridges it and can produce damp where there was none. The camera tells us which sort you have before anything is ordered.

The walls we still turn down. A wet cavity, one full of rubble at the base, one bridged with mortar, or a wall with no cavity trays over the windows. A fill in those buys a little heat loss back and a lot of penetrating damp risk.

Solid walls and extensions. The odd older cottage, a single skin garage conversion or a room over a porch has nothing to fill. Those take 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 external wall insulation with a mesh basecoat and a render carrier over the top.

Reveals, thresholds and junctions. A filled cavity still leaves cold bridges round the openings, at the threshold, along the floor junction, at the eaves and at the joist ends. Those strips are where condensation and black mould arrive. Shallow reveals take an aerogel laminate. This is the slow work and the first thing a cheap quote loses.

Ventilation and old fill. Trickle vents, extract fans that shift air and air bricks left clear, to the rates in Approved Document F. Where a 1980s fill has slumped and left the top metre empty, or the cavity is wet, we extract it, dry the wall and give a straight view on refilling.

Same team from first visit to last, one person to ring, and no sub-contracting your work out to somebody you have never met. The quote is itemised, not a figure on the back of a card: the survey and any borescope check, the system and its thickness, making good around windows and doors, ventilation works, and disposal on separate lines, so you can compare it properly against anyone else's.

Nothing is left open or unusable overnight. The site is swept at the end of each day rather than the end of the job, and what comes out leaves with us. If something turns up once we start that nobody could have seen, you get a photograph and a price before we carry on.

There is no conservation area over Crossways and nothing in the village is listed, so the outside face of your wall really is your decision, which is unusual round here. External work is still worth checking against the rules on external walls, and internal insulation is not development at all, per the Planning Portal's insulation guidance. Building control engages through regulation 23 once more than half a wall is renovated, under Dorset Council.

Ring rather than use the form. Damp patches or black mould appearing on an outside wall after cavity fill or internal lining usually means water is tracking across the cavity, or warm air is reaching a cold surface at a junction. We look before we take anything out, because the fix depends on which of those it is. If the fill went in decades ago, say roughly when, because 1980s mineral wool behaves very differently from anything installed recently. The phone is answered 24 hours for emergencies; scheduled work runs Monday to Friday, 8am to 6pm.

Call now: 07435 839745

Almost everywhere else we work is old, protected, or both. Crossways is neither. The village grew from the 1970s onwards, there is no conservation area over it and there are no listed buildings in it, so two of the three things that normally complicate a wall job simply are not there. You do not need permission, the finish is your choice, and the walls were built with a cavity in mind.

That changes the conversation in a useful way. In a cob or flint village most of a survey is spent explaining what cannot be done. Here it is spent on which fill and on the reveals. A cavity fill on a house like this is a day's work from outside, nothing to move indoors, no scaffold on a bungalow, and the shortest payback of anything we do. Part L sets what the finished wall should reach and a modern cavity comfortably gets there.

The two things worth being careful about are age related. Houses built from the mid 1970s may already have partial fill boards in the cavity, and blowing more in on top of those is a way of making damp. And a fill installed in the 1980s may have slumped since. Neither is a reason to avoid the work, both are reasons to put a camera in first. We do not run a guarantee scheme of our own, and a cavity fill installation is normally covered by an independent one, so keep the paperwork with your EPC.

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