Loft insulation in Woodlands
The layer that goes over the joists, the eaves left to breathe, and an itemised written price first.
The site visit is free and so is the written itemised quote. Thomas Hannen prices every job himself.
On most houses here the ceiling joists are shallow, so a single layer laid flush between them is nowhere near enough. The work is a second layer cross laid over the joists to bring the finished depth to 270mm.
Three situations bring the call. A room that never holds its heat. A look in the loft that shows the insulation sitting level with the top of the timber and nothing above it. And damp, noticed as mould on the roof timbers or a musty smell when the hatch comes down. A good deal of the housing around Woodlands went up in the years either side of 1960, before insulation was any kind of requirement, and those roofs have shallow joists that set a hard limit on what one layer can do. We look before quoting. The site visit and the written itemised quote are both free.
The work
Shallow joists, and what to do about them
Why one layer is never the answer. A ceiling joist in a house of this age is a shallow piece of timber, and anything laid between the joists can only be as deep as they are. Fill it flush and you have a fraction of the depth expected now, with every joist still running cold straight through the ceiling. The second layer, laid across the joists rather than between them, is what fixes both at once and brings the finished depth to 270mm.
What is already there. Most of these lofts have been topped up at some point. The old material has settled, gone patchy, been pulled back around cables and left bare at the edges. Dry and sound, we straighten it, close the gaps and keep it. Wet from an old leak, crushed under boarding or contaminated with droppings, it is bagged and leaves with us before anything new is laid.
Material. Mineral wool in a roll, glass wool or rockwool, does most of it, cut to a friction fit between the joists and then laid across them. Batts help where the joist centres are uneven, which is common in an older cut roof, and loose fill suits a roof space nobody can crawl through. Rigid board, PIR such as Celotex, goes where headroom is short, and sheep wool or a multi-foil quilt only where there is no depth to give at all.
Ventilation at the eaves. Insulation stops at the wall plate and never gets pushed over it. Vent trays hold the air gap open under the felt so cross ventilation carries on, and on a roof re-covered with breathable membrane the detail differs slightly. A ridge vent helps where the eaves cannot be opened. Cover the eaves and the loft stops drying itself out, which is how you get condensation, black mould and rot in the timbers.
The rest of the loft. The hatch is insulated on its back and sealed round the frame, which on an older ceiling closes a real route for warm air. A tank and its pipework need lagging now that nothing warm reaches them. Cabling is brought up above the new depth and clipped there rather than left underneath it, and a recessed light or downlighter in the ceiling below wants a fire rated cover. Where a loft is used, the boarding is rebuilt on loft legs so the storage sits clear of the second layer and the loft ladder still reaches a proper platform. A sloping ceiling or a dormer is worked at rafter level, board between the timbers with an air gap kept to the underlay.
How it runs
From your call to a written price
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 loft is not development, so there is no planning application, which Planning Portal guidance on insulation confirms. The planning authority here is the New Forest National Park Authority, and its National Park heritage and conservation guidance is the place to start on a listed building, since consent reaches internal work. Building control sets what the work must reach through Approved Document L, and HMRC VAT Notice 708/6 covers VAT on insulation.
Cost
What decides the price of a loft
No rate per square metre, because the floor area is the easy part and the awkward edges are where the time goes.
Getting to it. A detached house with a walk about roof space, a bungalow with a landing hatch, and a cottage with a small trap over a cupboard are three different mornings. A hatch on a landing you can stand a ladder under is one job. A hatch over a stairwell, a crawl space you can only move through on your knees, or a loft full of boarding that has to come up and go back, is time before any material is laid.
What is up there now, and what it is sitting on. Old material that has to come out, be bagged and taken away is a cost before anything new goes down, and so is a loft full of boxes that has to be emptied and put back. Joists at 400 centres with a flat run across them is a different afternoon from a trussed roof full of bracing.
Ventilation, and the edges nobody reaches. Insulation stops at the wall plate and the eaves have to stay clear, or you trade a warm bedroom for a wet roof. Getting depth right into the corners and around the hatch, boxing over downlighters and lagging anything that now sits in the cold, is most of the labour. Approved Document L sets what the work is expected to reach.
Comparing quotes? Ask what depth is actually being laid and in how many layers, whether the old material is coming out or being covered over, whether the eaves are being kept clear, what happens to anything you store up there, and whether the hatch and the pipework are included. Two quotes for the same job are usually two different jobs.
If the loft is wet
Water running off the felt, or mould on the underside
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. Out here it is often a bathroom fan discharging into the roof space rather than out through the tiles that is causing the damp, and that is quick to put right. The phone is answered 24 hours for emergencies; scheduled work runs Monday to Friday, 8am to 6pm.
Worth knowing
Shallow ceiling joists put a ceiling on what one layer can do
Much of the housing around Woodlands went up in the years either side of 1960. Those houses were built before insulation was any kind of requirement, which shows in one specific place: the ceiling joists are shallow. Whatever has been laid between them since is limited to the depth of that timber, and once it settles it is thinner again. That is why so many lofts here look full and perform badly.
The consequence is straightforward and it is good news. You do not need to strip these lofts out, and you do not need anything exotic. What you need is the layer that goes over the joists rather than between them, laid at right angles across the whole ceiling so the timber disappears under it. On a shallow joisted roof that cross laid layer is doing most of the work, not topping up the first one. It is also the reason we measure the joist depth at the visit and put it on the quote, because it tells you how much of the finished depth you already have.
Who you are dealing with
A local firm you can check
We cover Woodlands, Cadnam and Bartley, Minstead, Lyndhurst and the SO40 addresses around them, with the New Forest National Park Authority for planning. You are dealing with Bournemouth Roofing & Building, the trading name of Bournemouth Roofing & Building Ltd, registered in England and Wales, company number 15471719, which you can look up in a minute. Thomas Hannen's business, and he is the one who comes out to price the job, not a salesman. A verified customer's 10 out of 10 on Checkatrade. The visit and the written quote are both free.
Questions
Woodlands questions we get asked
How many days should we allow?
One, for the great majority of houses here. The old material comes out and goes into bags first, then the fresh layers go down. Allow a second day where a loft is full of stored things or the boarding has to be lifted and rebuilt on legs.
The loft looks full already. Why add more?
Because full to the top of the joists is not full. The joists here are shallow, so that depth is a long way short of what Part L expects, and every joist is still bridging heat out. The U value only comes right once a layer runs across the top of them.
Does the old material come out?
Only where it needs to. Dry, sound material is straightened, the gaps closed and kept as the first layer, which saves you money. Wet, crushed or contaminated material is bagged and taken away.
Will insulating make the loft damp?
Only where the air stops crossing. More depth means colder timbers above you, and moisture already in the house then settles on them. Open eaves, trays and a sealed hatch are the whole answer, and they cost very little while somebody is up there.
Do we need permission from the National Park?
Not for insulation. It is work inside the building and is not development, so there is no application. A dormer, a rooflight on a visible slope or a change of covering is a different question, and the Authority handles those.
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Get the joist depth measured
Thomas gets into the loft, measures what is really there and prices the rest in writing. Both are free.