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

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100mm Knauf DriTherm 32 Cavity Wall Insulation Slab 455mm x 1200mm 3.27m2 Pack

100mm DriTherm Cavity Slab 32 is a water-repellent Glass Mineral Wool slab designed for use in external full-fill masonry cavity walls, that offers the best thermal performance in the range. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.

£33.82£40.58 Ex VATInc VAT
£10.34£12.41 Per m2 Add to cart
100mm Knauf DriTherm 37 Cavity Wall Insulation Slab 455mm x 1200mm 6.55m2 Pack

100mm DriTherm Cavity Slab 37 is a water-repellent Glass Mineral Wool slab, designed for use in external full-fill masonry cavity walls, that offers excellent thermal performance. It is non-combustible with the best possible Euroclass A1 reaction to fire classification

£35.72£42.86 Ex VATInc VAT
£5.45£6.54 Per m2 Add to cart
150mm Knauf DriTherm 32 Cavity Wall Insulation Slab 455mm x 1200mm 2.18m2 Pack

150mm DriTherm Cavity Slab 32 is a water-repellent Glass Mineral Wool slab designed for use in external full-fill masonry cavity walls, that offers the best thermal performance in the range. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.

£35.86£43.03 Ex VATInc VAT
£16.45£19.74 Per m2 Add to cart

100mm Knauf DriTherm 32 Cavity Wall Insulation Slab 455mm x 1200mm 3.27m2 Pack

100mm Knauf DriTherm 37 Cavity Wall Insulation Slab 455mm x 1200mm 6.55m2 Pack

150mm Knauf DriTherm 32 Cavity Wall Insulation Slab 455mm x 1200mm 2.18m2 Pack