How to cut 40mm loft insulation?

PIR: sharp fine-toothed saw or insulation knife. Score and snap works on thinner boards. Mineral wool: Use a long-bladed insulation knife to cut the loft insulation foil blankets 40mm. Cut slightly oversize for a friction fit. Cut on a stable surface to get even cuts. Poor cuts create gaps, and gaps equal heat loss.

How to fix 40mm loft insulation?

Fixing will depend on the substrate and material: Between rafters or studs: Friction fit if sized correctly. Cut the rock mineral wool slightly oversized so it holds itself in place. PIR boards should fit snugly without compression. Under rafters: Mechanically fix boards with insulation fixings and large washers, then tape joints. Rock mineral wool can be friction-fitted or supported with timber battens. Floors: Lay boards over DPM where required. Should be tightly butted. Rock mineral wool is rarely used under floors due to compressive limits. Masonry walls: Use appropriate insulation fixings or adhesive systems. Checklist: Stagger joints Tape foil-faced boards Maintain vapour control where required Follow the manufacturer's fixing patterns

Where to buy 40mm loft insulation?

You can buy your 40mm loft insulation online from Insulation Wholesale. We stock PIR boards and rock mineral wool slabs. Everything is UK stock, ready for prompt nationwide delivery to your site.

40mm Loft Insulation At Wholesale Prices

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40mm Ecotherm Eco-Versal PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

40mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£21.97£26.36 Ex VATInc VAT
£7.63£9.16 Per M2 Add to cart
40mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

40mm 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.

£21.43£25.72 Ex VATInc VAT
£7.44£8.93 Per M2 Add to cart
40mm IKO Enertherm ALU PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

40mm 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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40mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 8 (23.04m2)
All three models 40mm Kingspan Therma PIR Insulation Board:
- 40mm Thermapitch TP10
- 40mm Thermafloor TF70
- 40mm 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.

Non-refundable.
£262.88£315.46 Ex VATInc VAT
£11.41£13.69 Per M2 Add to cart
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40mm Mannok PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

40mm Mannok PIR Insulation Board is an excellent choice for anyone looking for a high-performance insulation solution that provides superior thermal efficiency. It is ideal for use in any construction project, such as commercial and residential, in wall applications as well as roofing and flooring applications.

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40mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 138.24m2 Pallet

40mm Rockwool RWA45 has been developed for thermal, acoustic and fire performance in a range of construction types. It is suitable for applications on partition walls, ceilings, floors and roofs.

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40mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 56 (161.28m2)

40mm 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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