Loft insulation in Stourpaine

Loft problems in Stourpaine 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 Stourpaine 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.

In a Stourpaine house 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 in the Stourpaine loft. 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 state of an old loft, 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 one of the cheapest cuts in heat loss 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 of a Stourpaine loft 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 Stourpaine loft. 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.

Thomas prices your Stourpaine loft himself, from inside it. He checks the depth and state of what is there, the joist spacing, the hatch, the pipes and tanks, any downlighters, and above all whether air can get in at the eaves. His written quote splits out the survey, bagging and removing the old layer, the new material and how deep it will be, eaves ventilation, the hatch and any pipe lagging, and the clear-up.

In a Stourpaine loft we lay crawl boards over the joists so no foot goes through a ceiling, and sheet the landing below. The mineral wool goes down in a first layer between the joists and a second laid crossways over them, stopping short of the eaves so air can still move. Should the old layer be hiding a roof leak or a cable that needs an electrician, you see it in a picture with a cost first.

Insulating inside a roof is not development, as Planning Portal guidance on insulation explains. Regulation 23 comes in where more than half of an element is renovated, and then the whole of it has to reach the current standard. If your house is listed, listed building consent covers internal work, so start there. VAT rules for energy saving materials are worth reading before you order.

Ring instead of using the form. Beads of water on the felt, black spotting along the rafters or a loft that smells musty mean moist air from the house is condensing in a roof space with too little air moving through it, and the timber pays for that over time.

For now, keep the hatch shut, use the extractor fans, and hold off on adding more insulation, which can trap more damp. On the first visit we work out whether it is condensation or a roof leak. Scheduled work runs Monday to Friday, 8am to 6pm. Missed us on the phone? We ring you back as soon as we can.

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: on a house that is not listed, 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.

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

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