What loft insulation is best?

The best insulation for your loft depends on the type of property you have and what you want to achieve. For instance, older homes with joist spaces may suit mineral wool, while modern loft conversions often use rigid PIR boards. For many UK houses, mineral wool rolls are the go-to choice. These are typically manufactured from glass wool or rock wool. They are affordable, easy to install, and offer excellent thermal and acoustic insulation. If you are short on space or want better thermal performance, go for PIR panels. PIR insulation boards offer high performance in thin layers.

What does loft insulation do?

Loft insulation traps heat inside in the winter and keeps hot air out in the summer. Experts say that up to a quarter of a home’s heat can escape through an uninsulated roof. Therefore, proper loft insulation can reduce heat loss by as much as 25%, helping lower energy bills. It will also help keep indoor temperatures comfortable all year round.

How does loft insulation work?

It slows the transfer of heat through the roof structure. Insulating products such as mineral wool contain millions of tiny air pockets that trap warm air. This means less heat escapes in cold weather and less heat penetrates the house in warmer weather.

Can loft insulation be used in walls?

Yes, loft insulation materials such as glass and rock mineral wool can be used in walls, provided the product is rated for wall applications. It provides comparable thermal performance and can offer good sound insulation, depending on density. Standard loft rolls are used in some wall applications, but cavity walls typically require purpose-made cavity insulation. Just check the label to make sure it’s certified for walls (fire safety and moisture regulations).

Will loft insulation stop condensation?

Loft insulation can reduce condensation, but on its own, it might not eliminate it altogether. This happens because insulation reduces the possibility of moisture forming on cold surfaces. But you still need proper ventilation to let moist air escape. When you insulate and ventilate the loft properly, it will keep condensation under control.

Loft Insulation At Low Wholesale Prices

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80mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
All three models 80mm Kingspan Therma PIR Insulation Board:
- 80mm Thermapitch TP10
- 80mm Thermafloor TF70
- 80mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£214.38£257.26 Ex VATInc VAT
£18.61£22.33 Per M2 Add to cart
80mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 28 (80.64m2)

80mm Unilin Thin-R PIR insulation is a foil faced, high-performance insulation solution that offers exceptional thermal efficiency and durability. This polyisocyanurate insulation board, formerly known as Xtratherm, is ideal for a range of applications, such as floors, pitched roofs, and walls.

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90mm Ecotherm Eco-Bond PIR Insulation Board 1200mm x 1200mm (4′ x 4′) Pack of 3 (4.32m2)
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90mm IKO Enertherm ALU PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

90mm IKO Enertherm ALU PIR (polyisocyanurate) insulation is a top-quality insulation board featuring a rigid PIR foam core and reflective aluminium foil facings. It delivers outstanding thermal performance and moisture resistance, making it suitable for various installations and an ideal choice for different energy-efficient projects.

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90mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 86.40m2 Pallet

90mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.

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90mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 24 (69.12m2)

90mm Unilin Thin-R PIR insulation is a foil faced, high-performance insulation solution that offers exceptional thermal efficiency and durability. This polyisocyanurate insulation board, formerly known as Xtratherm, is ideal for a range of applications, such as floors, pitched roofs, and walls.

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110mm Celotex XR4110 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

110mm Celotex XR4110 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£49.29£59.15 Ex VATInc VAT
£17.11£20.53 Per M2 Get restock alert
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130mm Celotex XR4130 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

130mm Celotex XR4130 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£63.64£76.37 Ex VATInc VAT
£22.10£26.52 Per M2 Get restock alert
130mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

130mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£56.17£67.40 Ex VATInc VAT
£19.50£23.40 Per M2 Get restock alert
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20mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 15 (43.20m2)
All three models 20mm Kingspan Therma PIR Insulation Board:
- 20mm Thermapitch TP10
- 20mm Thermafloor TF70
- 20mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.

No longer in production.
£326.73£392.08 Ex VATInc VAT
£7.56£9.07 Per M2 Get restock alert