Loft insulation in Boldre

Most calls start the same way. A house that heats up quickly and cools down just as fast. A landing that is always colder than the rooms either side of it. Or somebody has been up for the Christmas boxes, seen daylight round the edge of the roll, and wondered how long it has been like that.

We start with a look rather than a price. What is up there now, how deep it really is once you push a rule into it, which way the joists run, whether the eaves are open, and whether anything has been wet. The site visit costs nothing and neither does the written quote. Where the loft is already sound we will tell you so and point you at the draughts instead.

Getting the old layer honest. Insulation that went down years ago has usually settled, compressed where anyone has knelt on it, and gone patchy where somebody pulled it back to run a cable and never put it right. Bare strips between the joists, a missing metre round the tank, and nothing at all in the last run before the wall. Anything contaminated or damp is bagged and taken away. The rest is straightened, gaps closed, and kept.

Depth, in two layers. The finished job is about 270mm, and it matters far more how it is laid than what it is called. First layer of mineral wool roll between the joists, second layer cross laid over the joists so the timber is buried and stops working as a cold bridge. Glass wool is the usual roll, rockwool batts are useful in narrow bays, sheep wool goes down where somebody wants it, and loose fill fills the awkward triangles at a hip. Get that right and the ceiling reaches the U value Approved Document L expects.

Keeping the roof breathing. The insulation stops on the wall plate and the eaves stay clear. Vent trays hold the roll back off the felt so there is a continuous air gap and cross ventilation from one side of the roof to the other, and where the eaves cannot be opened up a ridge vent does the same job at the top. This is not optional detail. Insulating a ceiling makes everything above it colder, the dew point moves up into the roof, and warm vapour from the house then finds a cold felt to condense on. Black mould on the rafters and damp insulation follow. Approved Document F is the reason we look at ventilation before we look at depth.

The services and the hatch. Downlighters get fire rated covers rather than a handful of wool thrown over them. Cables come up out of the insulation and are clipped to the joists. A cold water tank and its pipework are now on the cold side of the ceiling, so they get lagged and jacketed. The hatch is insulated on its back and given a compression seal, since a bare hatch is a hole in an otherwise good ceiling.

Storage, and where the roof slopes. Boarding straight onto joists squashes the wool flat and wastes the money, so where you want storage we raise a platform on loft legs above the full depth and board only that. Where a room in roof or a sloping ceiling is involved the work moves to rafter level, in rigid PIR board cut between the rafters with an air gap kept above it, another layer under, and taped joints so the vapour control is continuous. That is a warm roof and it is a different job from rolling out a loft floor.

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.

Insulation inside a roof space is not development at all, so permitted development does not even come into it and there is nothing to apply for, as Planning Portal guidance on insulation confirms. Building control still applies: regulation 23 means renovating more than half of an element brings the whole of it up to current standard. There is no conservation area over the housing here, though there are listed entries around the parish, and the New Forest is a designated landscape where anything that changes a roof from the outside gets looked at closely. Loft work does not. The VAT rules for energy saving materials are worth a read 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. Boldre is a run out from us but a wet roof space is not something we leave sitting, so it gets looked at within a day or two. The phone is answered 24 hours for emergencies; scheduled work runs Monday to Friday, 8am to 6pm.

Call now: 07435 839745

Boldre sits open to the south west, and that matters more in a loft than most people expect. Wind driving at a gable or an open verge does not stop at the eaves. It runs in under the tiles and along the top of the insulation, and the first metre or so of a mineral wool roll can be scoured of its still air like a duvet blown flat. The middle of the loft still performs. The perimeter, which is exactly where your outside walls are, quietly stops working.

The fix is not more depth in the middle. It is holding the edge down and taking the wind out of it: the roll butted properly over the wall plate rather than left short, vent trays fitted so the air path stays above the insulation instead of through it, and any gaps at the verge and the gable closed off. On an exposed plot that detail is worth more than the last 50mm of depth. When you are comparing quotes, ask whoever wrote them what happens at the eaves and at the gable end. If the answer is only a depth, you are being priced on the easy part.

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