Where to purchase 50mm loft insulation in the UK?

You can buy 50mm loft thickness insulation online from Insulation Wholesale. We stock PIR boards and mineral wool options in 50mm loft insulation thickness, ready for fast nationwide delivery. Most products are UK stock, meaning less waiting and fewer delays. Our team works with trade and self-build customers every day, so we understand site deadlines and staged deliveries.

How to cut 50mm loft insulation?

PIR boards: Mark clearly with a straight edge. Score deeply with a sharp knife. Snap over a firm edge. Trim foil facing cleanly. For precise work (like between rafters), a fine-tooth saw can help. Remember to wear gloves and eye protection. Mineral wool rolls or slabs: Lay insulation on a flat board. Use a long insulation knife for cutting wool insulation. Compress slightly while cutting for a straight edge.

How to install 50mm loft insulation?

Installation depends on build-up: Cold loft ceiling level: Lay mineral wool between joists first. Add cross-layering if topping up. Do not block eaves ventilation to maintain energy efficiency. Between rafters (pitched roof): Cut boards 2–3mm wider than the gap for a friction fit. Maintain required ventilation above unless building a warm roof design. Floor build-up: Install boards tightly together. Tape joints if required to ensure the effectiveness of insulation products. Lay structural decking above without compressing insulation. Check Building Regulations for required U-values, and manage condensation risk using appropriate vapour control layers.

How effective is 50mm Insulation loft?

It depends on the material and context. 50mm PIR: Strong thermal resistance for its depth. Good where space is tight. 50mm mineral wool: Moderate thermal performance but excellent fire and acoustic performance. On its own, thin 50mm loft insulation will not meet full cold-roof targets. As part of a layered system, it plays a valuable role in controlling heat flow and improving comfort. Need loft insulation 50mm thick for your next job? We supply a comprehensive range of loft insulation boards and slabs at low wholesale pricing with fast nationwide delivery.

50mm Loft Insulation At Wholesale Low Prices

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Products in 50mm Loft Insulation

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50mm Celotex GA4050 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

50mm Celotex GA4050 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.

£23.40£28.08 Ex VATInc VAT
£8.13£9.76 Per M2 Add to cart
50mm Ecotherm Eco-Versal PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

50mm 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.

£23.51£28.21 Ex VATInc VAT
£8.16£9.79 Per M2 Add to cart
50mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

50mm 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.

£23.45£28.14 Ex VATInc VAT
£8.14£9.77 Per M2 Add to cart
50mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 6.48m2 Pack

50mm 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.

£27.94£33.53 Ex VATInc VAT
£4.31£5.17 Per m2 Add to cart
50mm Ecotherm Eco-Bond PIR Insulation Board 1200mm x 1200mm (4′ x 4′) Pack of 6 (8.64m2)

50mm Eco-Bond PIR insulation boards provide a lightweight, easy-to-install solution for new roofs or upgrading existing ones. Ideal for use with fully adhered single-ply waterproofing on concrete, metal, and timber decks.

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50mm IKO Enertherm ALU PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

50mm 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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50mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 6 (17.28m2)
All three models 50mm Kingspan Therma PIR Insulation Board:
- 50mm Thermapitch TP10
- 50mm Thermafloor TF70
- 50mm 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.
£192.32£230.78 Ex VATInc VAT
£11.13£13.36 Per M2 Add to cart
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50mm Mannok PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

50mm 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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50mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 8.64m2 Pack

50mm 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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50mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 48 (138.24m2)

50mm 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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