Loft insulation in Stourpaine

Calls out of the village divide fairly neatly. Somebody has a landing that is cold at ankle height and a bedroom door that whistles. Somebody else has looked through the hatch for the first time in years and found thin, uneven wool with the joists standing proud of it. And now and then it is the smell: a musty note when the trapdoor opens, which is moisture rather than dust.

All three want the same first step. We come up and go over the whole roof space rather than judging it from the top of the ladder, take the depth in several spots, put a hand past the wall plate to test the air path, read the underside of the covering for the marks damp leaves, and photograph what we find. Then a written quote with the material, the finished depth, the hatch, the ventilation and the disposal priced separately. The site visit costs nothing and neither does the quote.

The hatch comes first because that is where the house leaks into the roof. A thin plywood flap in a bare timber lining is a hole in the ceiling with a lid on it, and every degree the heating puts into the landing goes up through it carrying moisture with it. Rigid board goes on the back of the door, compression seal goes round the lining, and if there is a loft ladder it gets checked so it still swings clear once the floor level changes.

Next, what is already up there. Old wool settles under its own weight, is compressed flat wherever somebody has knelt, goes patchy in the middle and is usually missing altogether down one edge, with a gap left at every cable and pipe crossing. If it is dry and in one piece it stays, gets teased back open and levelled between the joists. If it is contaminated with droppings, has been wet under a slipped tile, or has broken down into dust, it is bagged in the loft and carried out.

Then the depth, in two layers. The first is friction fitted between the joists so nothing is left open at the sides. The second is cross laid over the joists at right angles to the first, which buries the timber and stops it conducting heat down into the plaster. A single flush layer is the commonest thing we find and it is half a job. About 270mm all in is the sort of depth a renovated ceiling needs to reach the U value in Approved Document L, and it is the biggest cut in heat loss most of these houses have left. Mineral wool roll for open runs, rockwool batts where the bays vary, loose fill where nothing else will lie flat, sheep wool if you prefer a natural fibre.

Air is the other half and it gets settled before any depth is agreed. The material is carried out over the wall plate and stopped, with a vent tray at each rafter holding an air gap open so cross ventilation still runs from one eaves to the other. Push the wool on into the eaves and the roof cannot dry itself: the dew point shifts into the structure, interstitial condensation forms out of sight, and you get black mould over the rafters and wool full of water. Where the eaves genuinely cannot be opened, a ridge vent or tile vents take over. A breathable membrane changes the detailing rather than the requirement, and Approved Document F is the standard behind all of it.

Last, the fittings and what you do with the space. Every recessed light and downlighter takes a fire rated cover instead of being smothered. Cable and wiring are lifted onto the new layer, since buried wiring runs hot. A cold water tank and its pipework are suddenly sitting in cold air, so lagging follows on the same visit and nothing goes underneath the tank. If you want storage, boarding is fixed to loft legs so a raised floor sits clear of full depth and the platform you use does not crush what you have paid for. And where the roof is already a room in roof, with a sloping ceiling and dormer cheeks, the work moves to the rafters as a warm roof: PIR rigid board such as Celotex cut tight with an air gap left under the felt, a taped vapour control layer, and multi-foil quilt in the corners where the depth has run out.

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, clearing and bagging whatever is up there now, the material and its depth, keeping the eaves clear, the hatch and any pipework, 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.

Insulating inside a roof is not development, so nothing is applied for and no permitted development right is spent, which Planning Portal guidance on insulation sets out. Building control applies where regulation 23 does, when more than half of an element is renovated and the whole of it has to reach current standard. Stourpaine has its own conservation area and there are a good number of listed entries around the village, so listed building consent is the place to start if yours is one, because consent covers internal work as well. VAT rules for energy saving materials are worth reading before you order.

Ring rather than use the form. Droplets on the underside of the felt, black mould spreading across the roof timbers, or insulation that is visibly damp are all telling you the same thing: warm wet air is getting into a space that cannot breathe. That does not wait, because it is the timbers that pay for it. We look before anything is added, because putting more insulation into a loft that cannot ventilate makes it worse. Stourpaine is a run out along the Stour for us, but a wet roof space does not get left in the diary. The phone is answered 24 hours for emergencies; scheduled work runs Monday to Friday, 8am to 6pm.

Call now: 07435 839745

The village has a conservation area over it, and that draws a clean line through this job. Everything that makes the ceiling warm is invisible from the lane. Depth, material, the second layer, boarding, the hatch, rafter level work in an older roof: none of it is anybody else's business and none of it is applied for.

The exception is ventilation, and only in one direction. Where a roof has boxed eaves that cannot be opened up, the tidy answer is often vent tiles set into the slope or a vent along the ridge, and those do change the look of the roof. On a rear slope that is rarely a problem. On a front elevation inside the conservation area, or on a cottage that is itself listed, where listed building consent reaches inside the building as well as out, it is a conversation to have first rather than a surprise afterwards. So on a village address we work out where the air can come from before we settle the specification, and if the neat solution is one that would show from the road we will tell you and set out what else is possible.

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