What to look out for when buying loft insulation

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Having loft insulation installed is a great way to reduce energy costs and stay warm. There are a number of options when it comes to selecting this insulation for your home, and a variety of different insulating materials to choose from.

Blanket or batt loft insulation

This type comes in foil-backed felt rolls, or as rolls of mineral fibre or glass, and is one of the most commonly used types of loft insulation. One option is to have it made of sheep’s wool, which can cost more.


On the plus side, this kind of insulation is easily installed (you can do it yourself) and some brands do use sheep’s wool or recycled glass, which won’t irritate.


Some materials can be irritating, especially if you have sensitive skin. If space is small or there are lots of obstructions, blanket rolls may be too bulky to fit.

For accessible spaces, this kind of insulation is especially handy.

Loose-fill insulation

This is made from a range of lightweight or granular materials including mineral wool, cork granules and cellulose fibre.

Greener options include recycled newspaper.


This is a useful way to top up an attic’s current insulation.

It fits snugly around obstructions or unevenly spaced joists.


On the downside, it may come loose if your loft is very draughty, and you’ll need protective clothing and the right safety kit while you are installing it.

Sheet loft insulation

This is for insulating a roof’s sloping sides. It comes as hard boards, some with a fire or moisture resistant or decorative cover. For an extra charge, you can order this pre-cut to specific sizes.

Greener options include cork, wood and straw boards. This is great for loft conversions, and you can cover it with plasterboard for a nicer looking finish.

However, it can be expensive, and a lot of energy is used during the production of this insulation.

Blown-fibre loft insulation

This must be installed professionally, and is blown into the gaps between joists.

Again, it can be quite expensive and isn’t recommended for draughty lofts. But it’s light, convenient and eco-friendly, goes well in areas where access would otherwise be tricky, and can be installed quickly and easily.