Loft insulation in Milborne St Andrew

People here ring for one of three reasons. Upstairs rooms that never feel warm however long the heating runs.

A loft that turns out, once anybody actually looks, to hold a thin flattened layer with bare timber showing round the edges. Or damp in the roof space, with water standing on the underside of the felt and mould creeping along the rafters.

The survey comes before the price. What is there, how deep it really is, which way the joists run and at what centres, whether the eaves are open, and what has been stored on top of it all. The site visit and the written itemised quote are both free, and if the loft is already sound we will point at where the heat is going instead of selling you something.

Everything starts with a rule pushed down through the layer, in several places rather than one. The figure that matters is the depth under the surface, not the depth it looks from the hatch, and there is usually a difference. The run and the centres of the joists get measured at the same time, because that decides whether a roll will do the job or whether the first layer has to be cut to each bay.

Then what stays and what goes. Old material settles, compresses under anyone who has knelt on it, thins where a cable or an aerial was pulled through, and stops short of the wall on every side. Sometimes it is contaminated with droppings. Sometimes it has been wet under a slipped tile. Those go into bags and leave with us. Anything dry and sound is straightened, has its gaps closed and stays where it is under the new work.

Depth is laid in two runs and the second one is turned. The first goes between the joists, friction fitted so nothing is missing at the sides. The second is laid across the joists at right angles so the timber ends up buried. A joist left proud is a thermal bridge, and a ceiling full of them hands its heat back in stripes no matter how thick the wool between them is. About 270mm together is the u value the finished ceiling is expected to reach, which Approved Document L sets. Glass wool on the roll for most runs, rockwool batts for an old roof with bays of every width, loose fill for the corners a roll will not lie flat in, sheep wool if you ask for it, and rigid PIR board where there is no depth to work with at all.

Ventilation is settled before the depth arrives. Insulate a ceiling well and the roof over it gets cold, the dew point climbs into the timbers, and vapour leaving the house condenses on the felt instead. So the layer is stopped on the wall plate, vent trays hold a clear air gap at the edge, and cross ventilation carries the moisture from one eaves to the other. Boxed soffits get a ridge vent or a run of vent tiles doing the same job, and a breathable membrane only changes how the edge is finished. Approved Document F sits behind it, and shutting the eaves is how people end up paying for a new set of rafter feet and for the interstitial condensation that rotted them.

Then the fittings and the floor. Recessed lights take rated covers. Cables are lifted clear of the wool and clipped to the timber, since buried wiring runs warm. A cold water tank and its pipework are now standing in cold air, so the pipework is lagged and the tank gets a jacket, and we never insulate underneath a tank. The hatch takes a board of insulation on its back and a draught seal, with the loft ladder reset if the new depth catches it. Boarding laid straight on the joists crushes the material and throws away the depth you have paid for, so a floor goes up on loft legs and only the platform you use is boarded. Where a cottage has a room in the roof or a sloping ceiling, the work moves to rafter level: rigid board cut tight between the rafters, a clear gap kept under the underlay, another layer beneath, joints taped, and a warm roof built so no cold surface ever sits where warm air can reach it. Multi-foil quilt is what goes in when nothing thicker will.

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 a roof space is not development, so no permitted development right is spent and nothing is applied for, which Planning Portal guidance on insulation sets out. Building control matters where regulation 23 does, which is when more than half of an element is renovated and the whole of it has to come up to current standard. There is no conservation area here, but there are a good number of listed entries near the village, and listed building consent is where to start if yours is one, because consent covers internal work too. 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. Milborne St Andrew is a run out for us, but a wet roof space is not left waiting for a slot. The phone is answered 24 hours for emergencies; scheduled work runs Monday to Friday, 8am to 6pm.

Call now: 07435 839745

Walk through the village and you pass both. The older houses have a traditional cut roof, built on site from rafters and purlins, with a proper open space you can move about in and joists you can see the run of. The newer ones have trussed rafters, delivered as ready made frames and set close together, with diagonal bracing and binders running everywhere at knee height. Same insulation, very different mornings.

In a cut roof the work is straightforward and boarding for storage is easy to add. In a trussed roof you cannot walk anywhere without crossing a brace, the material has to be fed through in smaller pieces, and there is one rule that matters more than any other: nothing in a truss gets cut, notched or drilled, because every part of it is carrying load. If a boarded floor is wanted over trusses it goes on loft legs spanning across them rather than fixed to them. When you compare quotes, ask which kind of roof you have and what the other firm intends to do about the bracing. If they have not been up, they do not know.

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