Loft insulation in Winterborne Kingston

The outer metre comes first. On an exposed Winterborne Kingston roof that strip is where the money goes. The wool is taken the whole way out over the wall plate and stopped there, which on a shallow pitch means lying on your front to do it properly.

A vent tray goes into every rafter bay above it so the gap stays open and ventilation still travels the length of the roof. Shut the eaves and the moisture that used to leave the roof has nowhere to go but the cold underside of the felt. The dew point ends up inside the material, interstitial condensation forms where nobody can see it, and by spring the wool is soaked and the rafter feet are black. BS 5250 is the code for managing moisture in a roof.

What is already up there. Old material in a Winterborne Kingston loft settles, compresses, is patchy in the middle and missing at the outer edge, with a gap wherever a cable or a pipe was pulled through. If it is dry and still in one piece it stays put and the new work sits on top. If it is damp, blackened underneath or full of droppings, it is bagged at the hatch and taken away, and that appears as its own line on the quote rather than as a surprise at the end.

Choosing what to lay. Most of what goes into a Winterborne Kingston loft is mineral wool: glass wool on the roll, or rockwool in batts, and where the joists were cut on site each piece is trimmed to its bay instead of being forced in. A ceiling that a roll will not lie flat on is better served by loose fill, poured or blown. Sheep wool if you want it. Once the headroom has gone, rigid PIR board cut tight and taped, with multi-foil quilt for whatever depth is left after that. Out at the exposed edge rigid board earns its place too, because there is nothing in a board for the wind to get into.

Two runs, and the second one turned. A single layer sitting flush between the joists of a Winterborne Kingston loft leaves every timber taking heat straight out through the ceiling. So one run drops in between them and a second crosses them, square to everything underneath, and that second run is what breaks the bridge. Around 270mm in total is the u value Approved Document L sets for a renovated ceiling under Part L, expressed as a depth, and when it has been done properly you cannot pick out a joist top anywhere.

Fittings, hatch and rafter level. Every recessed light is given a rated cover so nothing rests against the fitting. Cable is run over the top of the new layer rather than through it, because wiring buried in wool runs warm. The cold water tank and the pipes serving it have just been left outside the warm part of the house, so lagging goes on. The hatch is boarded on its loft face and sealed, since an open one is a hole in the ceiling and a draught along the landing. Anything stored up there returns on loft legs standing above the wool. And where there is no loft floor to speak of, because the roof was turned into a room, the whole job belongs up at the rafters as a warm roof, sloping ceilings and dormer cheeks included.

The floor area of a loft is the easy part to measure, and the edges are where the hours go.

Getting up and moving about. A clear Winterborne Kingston loft with a ladder and room to stand is quick. A trapdoor in a bedroom cupboard, a shallow bungalow roof you crawl through, or a loft boarded for storage that has to come up and go back all add time before any material is laid. Getting in is work at height, even indoors.

What is there now. Old insulation that is damp, compressed or full of debris is bagged and removed. Rolls laid between the joists and a second layer across them give the depth, and a trussed roof full of bracing is slower than an open one.

The eaves and the details. Insulation stops at the wall plate and the eaves stay open, or the roof timbers get wet. Boxing over downlighters, lagging pipes and a cold water tank, and insulating the hatch are all labour. On the south west side, where wind drives rain at the edges of the roof, keeping the ventilation working matters more.

Approved Document L sets what the finished loft should reach.

Ask other quotes what depth is going in and in how many layers, whether the old material comes out, and whether the eaves and hatch are included.

The weather here arrives from the south west with very little standing in its way, and that does something specific to a loft that nobody mentions when they sell you depth. Air driven in at the eaves does not stop at the wall plate.

It runs along under the covering and blows through the open face of a soft quilt at the perimeter, stripping heat out of it the way wind strips it out of a jumper. It is why the cold patch on a ceiling below shows up as a band around the outside of a room rather than in the middle of it.

Adding more depth in the middle does nothing about that, so the perimeter gets treated as its own piece of work. The layer is carried right out over the wall plate rather than stopped a hand's width short, which on a shallow roof means working on your front to do it properly. Vent trays hold the air path open above it, because the answer to a draught is never to block the ventilation. And where the edge is badly exposed we finish the outer run in rigid board rather than soft wool, so there is nothing left for the wind to get into.

Thomas Hannen is the one who climbs through your hatch and prices the loft. His company, Bournemouth Roofing & Building Ltd, is registered in England and Wales, company number 15471719. Before you book a visit in Winterborne Kingston, you can read our customers' Google reviews, word for word, on our reviews page.

From our base at 80a Wolverton Road, Boscombe, Winterborne Kingston is about 16.2 miles, and we insulate lofts across the village, Bere Regis, Winterborne Whitechurch, Milborne St Andrew, Anderson and the other Winterborne villages in DT11. Dorset Council covers planning and building control. Checkatrade carries a 10 out of 10 from a verified customer of ours. The survey visit is free, as is the itemised quote in writing.

Most repairs in Winterborne Kingston need no application at all. What decides whether a change to the outside of your house does is who the council is, whether a conservation area or a listing applies, and whether the place sits in a protected landscape.