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

40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

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Celotex-Insulation-Wholesale-Board-Wall2-Application

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40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

40mm Celotex TB4040 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.

£21.75£26.10 Ex VATInc VAT
£7.55£9.06 Per M2

Insulation By Thickness

Insulation By Thickness Range

2mm Insulation (1)

3mm Insulation (2)

5mm Insulation (6)

6mm Insulation (3)

8mm Insulation (1)

9mm Insulation (3)

10mm Insulation (2)

12mm Insulation (5)

15mm Insulation (7)

18mm Insulation (1)

20mm Insulation (24)

25mm Insulation (86)

27mm Insulation (2)

30mm Insulation (29)

37.5mm Insulation (6)

40mm Insulation (24)

42.5mm Insulation (1)

45mm Insulation (2)

48mm Insulation (2)

50mm Insulation (62)

50.5mm Insulation (1)

52.5mm Insulation (6)

57.5mm Insulation (1)

60mm Insulation (40)

62.5mm Insulation (7)

65mm Insulation (1)

70mm Insulation (19)

72.5mm Insulation (6)

75mm Insulation (42)

80mm Insulation (27)

82.5mm Insulation (4)

85mm Insulation (2)

90mm Insulation (25)

92.5mm Insulation (2)

100mm Insulation (63)

110mm Insulation (11)

115mm Insulation (4)

120mm Insulation (22)

125mm Insulation (11)

130mm Insulation (16)

140mm Insulation (23)

150mm Insulation (36)

165mm Insulation (2)

180mm Insulation (2)

200mm Insulation (6)

Products in Insulation By Thickness

40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

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

40mm Jablite HP+ 70E External Wall Insulation Board 1200mm x 600mm (4′ X 2′) Pack of 15 (10.80m2)

40mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 10 (7.50m2)

40mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x1200mm Pack of 8 (23.04m2)

40mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

40mm Rockwool Ductslab Insulation 1000mm x 600mm 6m2 Pack

40mm Rockwool Ductwrap Insulation Wrap 4000mm x 1000mm 8m2

40mm Rockwool FirePro Pipe Collar CE

40mm SuperFOIL SF19BB Breathable Thermal Insulation Roll 1.2m x 10m (12m2)

40mm Thick 108mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 114mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 140mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 159mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 21mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 27mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 34mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 42mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 48mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 54mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 60mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 67mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 76mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

40mm Thick 89mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm

42.5mm Kingspan Kooltherm K118 Insulated Plasterboard 2400mm x 1200mm Pack of 18 (51.84m2)

45mm Multi-Layer SuperFOIL SF19+Insulation Roll 1.2m x 10m (12m2)

45mm Multi-Layer SuperFOIL SF19+Insulation Roll 1.5m x 10m

48mm British Gypsum Gyproc ThermaLine PLUS Plasterboard Tapered Edge 2400mm x 1200mm (8′ x 4′) 2.88m2

50mm Celotex CW4050 Cavity Wall Insulation Board 1200mm x 450mm 5.94m2 Pack of 11 (5.94m2)

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

50mm Celotex PIR Insulated Plasterboard 1200mm x 2400mm + 12.5mm P/B 2.88m2

50mm Ecotherm Eco-Versal PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2