Where to buy insulation by thickness?

You can buy insulation by thickness from Insulation Wholesale. We stock multiple materials across a full depth range, so you can choose the material that best fits your construction build-up, without compromising. Our team helps match insulation thickness to your application, whether for floors, walls, roofs, or specialist applications. We supply UK stock and support both trade and DIY customers with clear advice and reliable delivery.

What insulation thickness is best?

There is no single “best” insulation thickness. The right choice depends on the space available, the target U‑value, and the material used. A thinner high‑performance foam can outperform a thicker fibrous product, while deeper mineral wool can give better sound control and fire resistance. Choose the thickest insulation that fits without compression while complying with UK Building Regulations.

Can different materials be mixed at the same thickness?

Yes, you may combine materials - as long as they are compatible and correctly detailed. You can combine a rigid board layer with mineral wool of the same depth to improve thermal control and sound absorption, for example. The key is to maintain continuity with no air gaps. Do a full vapour control and condensation risk assessment before combining materials.

Insulation By Thickness At Wholesale Prices

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 Rockwool Rainscreen Duo Slab 1200mm x 600mm 69.12m2 Pallet

50mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.

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50mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 69.12m2 Pallet

50mm Rockwool RW3 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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50mm Rockwool RW4 Acoustic Insulation Slab 1200mm x 600mm 69.12 m2 Pallet

50mm Rockwool RW4 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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50mm Rockwool RW5 Acoustic Insulation Slab 1200mm x 600mm 69.12m2 Pallet

50mm Rockwool RW5 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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5mm Regupol 7210C Acoustic Resilient Layer 1.15m x 2.25m

5mm Regupol 7210C Acoustic Resilient Layer 1.15m x 2.25m is designed to isolate screeds from the main structure of the building reducing impact energy generated by general footfall.

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60mm Rockwool Ablative Coated Batt 1200mm x 600mm x 0.72m2

60mm Rockwool Ablative Coated Batt is a mineral wool insulation product, pre-coated on both sides with a high performance ablative coating. Rockwool Ablative Coated Batt application includes multiple substrates including solid walls, floors, and flexible walls.

£27.20£32.64 Ex VATInc VAT Add to cart

60mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 103.68m2 Pallet

60mm 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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60mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 51.84m2 Pallet

60mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.

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60mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 51.84m2 Pallet

60mm Rockwool RW3 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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60mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 92.16m2 Pallet

60mm 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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70mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 92.16m2 Pallet

70mm 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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75mm Knauf Rocksilk RS45 Building Insulation Slab 1200mm x 600mm 4.32m2 Pack

75mm Knauf Insulation Rocksilk RS45 is a Rock Mineral Wool slab, designed for use in multiple thermal and acoustic applications. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.

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75mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 51.84m2 Pallet

75mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.

POA Get a quote

75mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 51.84m2 Pallet

75mm Rockwool RW3 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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75mm Rockwool RW4 Acoustic Insulation Slab 1200mm x 600mm 46.08m2 Pallet

75mm Rockwool RW4 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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75mm Rockwool RW5 Acoustic Insulation Slab 1200mm x 600mm 43.20m2 Pallet

75mm Rockwool RW5 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.

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8mm Regupol E48 Under Screed Acoustic Flooring Crumb Roll 13m x 1.15m

8mm Regupol E48 (sonus curve 8) Screed Acoustic Flooring Roll 13m x 1.15m is a high performance recycled tyre crumb acoustic flooring material used for under screed and designed to isolate screeds from the main structure of the building

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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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150mm Isover CWS 36 Cavity Wall Slab 3.28m2 Pack

150mm Isover CWS 36 Cavity Wall Slab 3.28m2 Pack

150mm Isover CWS 36 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.

£26.91£32.29 Ex VATInc VAT
£8.20£9.84 Per m2 Get restock alert

60mm Superglass Multi Acoustic Roll Insulation 13.50m2 Roll

Superglass-Acoustic-Roll-APR-Application

60mm Superglass Multi Acoustic Roll Insulation 13.50m2 Roll

60mm Superglass Acoustic Partition Roll (APR) is a lightweight, non-combustible glass mineral wool insulation roll. It is suitable for the following applications: internal walls and floors, timber and metal stud partitions, drylining systems and separating walls and floors. Manufactured at a minimum density of 10kg/m³.

£29.41£35.29 Ex VATInc VAT
£2.18£2.62 Per m2 Get restock alert

60mm URSA Acoustic Partition Roll Insulation 12m2 Roll

60mm URSA Acoustic Partition Roll Insulation 12m2 Roll

60mm URSA Acoustic Roll is a lightweight, non-combustible, unfaced glass mineral wool product for use as acoustic insulation in timber or metal framed internal partition walls, timber or metal framed separating walls and timber separating floors.

£40.97£49.16 Ex VATInc VAT
£3.41£4.09 Per m2 Get restock alert

80mm Superglass Multi Acoustic Roll Insulation 12.48m2 Roll

80mm Superglass Multi Acoustic Roll Insulation 12.48m2 Roll

80mm Superglass Acoustic Partition Roll (APR) is a lightweight, non-combustible glass mineral wool insulation roll. It is suitable for the following applications: internal walls and floors, timber and metal stud partitions, drylining systems and separating walls and floors. Manufactured at a minimum density of 10kg/m³.

£40.15£48.18 Ex VATInc VAT
£3.22£3.86 Per m2 Get restock alert