Loft Insulation Aberdeen

Why the loft matters more in a granite house

Aberdeen is built from granite, and that single fact changes the insulation conversation more than most homeowners realise.

Solid walls, no cavity to fill

Traditional granite construction is solid wall. There is no cavity between two leaves of masonry, which means the cheap and quick fix available to most of the UK, cavity wall insulation, simply does not apply here. Improving a solid granite wall means internal or external wall insulation: expensive, disruptive, and in many cases constrained by the appearance of the building.

The practical consequence is that for a large share of Aberdeen homes, the loft is the one place where a big improvement is available at modest cost and with almost no disruption. If your walls cannot economically be improved, getting the ceiling right stops being one option among several and becomes the main event.

Exposure, wind and wind-driven rain

The north east is exposed. Coastal and open sites take sustained wind and wind-driven rain that inland Scotland does not see to the same degree, and that has two effects on a loft.

First, wind washing. Air driven in at the eaves can move through and around loosely laid insulation, carrying heat with it and reducing the performance you paid for. Insulation needs to be laid tight to the joists and properly detailed at the wall head rather than simply rolled out and left.

Second, moisture. A roof space in an exposed location has to be able to dry. Blocking ventilation paths at the eaves while adding depth is a reliable way to produce condensation, and it is the fault we most often find in Aberdeen lofts that were insulated cheaply in the past.

Colder, for longer

Aberdeen has a longer heating season than most of the UK. The same insulation upgrade returns more here than it would in the south of England, simply because the heating runs for more of the year. That also means the payback period on the work is shorter.

What we install, and how deep

Loft insulation works by slowing the escape of heat through the ceiling into the roof space above. The rooms below stay warm; the loft gets colder, which is intended. Anything up there that could freeze, such as pipework and tanks, gets lagged on the cold side of the insulation.

How thick should loft insulation be?

270mm of mineral wool is the widely recommended depth in Scotland. It is not a legal requirement for a home you already live in. Building standards set separate requirements for new build, extensions and conversions.

Most older ceiling joists are around 100mm deep, so reaching 270mm means a first layer between the joists and a second laid across them at right angles. Anyone quoting a single layer to full depth has not thought about it properly.

Do you need to remove the old insulation?

Usually not. Dry, clean, evenly laid insulation can simply be topped up, which is cheaper and just as effective. Removal is justified where material has been contaminated by vermin, soaked through a roof leak, or degraded to the point where it no longer performs. If your existing layer is fine, we will say so.

Loft boarding without ruining the insulation

Boarding directly onto the joists compresses the insulation beneath and destroys much of its value. A raised system lifts the deck above the full insulation depth on legs, so you get storage and the performance you paid for. It costs more up front, and it is the only version worth doing.

What we are actually looking at

Most lofts fall into one of these. The survey is about working out which, and what it needs.

Insulation grants in Scotland

Other schemes

• Great British Insulation Scheme: closed to new applications on 31 March 2026. Pages still offering it are out of date.
• ECO4: the Energy Company Obligation, delivered by energy suppliers to low-income and vulnerable households. Extended to 31 December 2026.
• Warmer Homes Scotland: for households in or at risk of fuel poverty.

Other insulation measures for granite homes

The loft gives the biggest reduction in heat loss for the lowest cost of insulation, which is why we start there. But in a solid-walled property it is worth understanding the full picture before you decide how far to go.

• Underfloor insulation: suspended timber floors over a ventilated void are common in older Aberdeen properties and lose more heat than most owners expect.
• Room in roof insulation: for converted attics with no open loft to work in.
• Internal wall insulation: the realistic route for granite. Applied to internal walls, it reduces room size slightly and needs care around moisture, but it works.
• Cavity wall insulation: only relevant to later suburban stock in Aberdeen. Granite has no cavity to fill.

Which type of insulation is best?

It depends on the house. Mineral wool suits most lofts on cost and performance. Sheep's wool and other natural, sustainable insulation materials handle moisture well and are a sensible choice for older breathable construction, at a higher price. Multifoil is useful where depth is limited. Every installation comes with a written guarantee, and a fixed price agreed before we start.

Over the colder months, a Scottish home with a properly insulated ceiling holds its heat measurably better, which is what lower energy bills actually come from. We would rather give you a realistic figure at survey than a headline percentage here.

Frequently asked questions