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Cavity and Internal Wall Insulation

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When you’re looking for thermal insulation for a construction project, or you need to improve energy efficiency in an existing building, it’s worth investing in quality cavity wall insulation. In our wide range of wall insulation and cavity insulation you’ll find glass mineral wool rolls and slabs, resin-bonded slabs, and stone wool slab options. All of our wall insulation is certified Euroclass A1 fire resistant and is suitable for external wall insulation and partition wall insulation. You’ll also find acoustic insulation to aid privacy and noise reduction from adjoining properties, above and below. With a choice of sizes and ready cut options you’ll find what you need to suit your building application.
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Knauf Acoustic Roll Ready Cut 50mm 13.50m 2 x 600 16.2m2 Per Pack
5 (1 review)
Product Code: 848612
Knauf Acoustic Roll Ready Cut 50mm 13.50m 2 x 600 16.2m2 Per Pack
Retail price

£86.30

per pack
£71.92 ex. vat
£43.15per item
Trade price
£77.89
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Knauf Insulation DriTherm 32 Cavity Insulation Slab 150mm 1200mm x 455mm
Product Code: 545715
Knauf Insulation DriTherm 32 Cavity Insulation Slab 150mm 1200mm x 455mm
Retail price

£78.37

per pack
£65.31 ex. vat
£19.59per item
Trade price
£70.52
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Knauf Dritherm Cavity Slab 32 100mm 455 x 1200mm 3.276m2 Per Pack
Product Code: 848611
Knauf Dritherm Cavity Slab 32 100mm 455 x 1200mm 3.276m2 Per Pack
Retail price

£56.39

per pack
£46.99 ex. vat
£9.40per item
Trade price
£48.70
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Knauf Dritherm Cavity Slab 32 75mm 455 x 1200mm 3.276m2 Per Pack
Product Code: 848615
Knauf Dritherm Cavity Slab 32 75mm 455 x 1200mm 3.276m2 Per Pack
Retail price

£79.00

per pack
£65.83 ex. vat
£13.17per item
Trade price
£67.73
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Knauf Insulation DriTherm 37 Cavity Insulation Slab  75mm 1200mm x 455mm
5 (2 reviews)
Product Code: 497095
Knauf Insulation DriTherm 37 Cavity Insulation Slab 75mm 1200mm x 455mm
Retail price

£42.76

per pack
£35.63 ex. vat
£5.34per item
Trade price
£36.66
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Rockwool RWA45 Semi-Rigid Acoustic Insulation Slab 100mm x 1200mm x 600mm (2.88m2 pack)
4.9 (17 reviews)
Product Code: 961938
Rockwool RWA45 Semi-Rigid Acoustic Insulation Slab 100mm x 1200mm x 600mm (2....
Retail price

£58.09

per pack
£48.41 ex. vat
Trade price
£52.28
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Knauf Acoustic Roll Ready Cut 100mm 10.30m 2 x 600 12.36m2 Per Pack
5 (3 reviews)
Product Code: 848621
Knauf Acoustic Roll Ready Cut 100mm 10.30m 2 x 600 12.36m2 Per Pack
Retail price

£115.85

per pack
£96.54 ex. vat
Trade price
£104.40
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Knauf Dritherm Cavity Slab 37 100mm 455 x 1200mm 6.55m2 Per Pack
5 (2 reviews)
Product Code: 848602
Knauf Dritherm Cavity Slab 37 100mm 455 x 1200mm 6.55m2 Per Pack
Retail price

£65.18

per pack
£54.32 ex. vat
£5.43per item
Trade price
£55.87
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Rockwool RWA45 50mm Acoustic Insulation Slab 1200mm x 600mm 6.48m2/ Pack
Product Code: 767866
Rockwool RWA45 50mm Acoustic Insulation Slab 1200mm x 600mm 6.48m2/ Pack
Retail price

£55.21

per pack
£46.01 ex. vat
Trade price
£52.56
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Recticel Eurowall Cavity Insulation Board 1200 x 450 x 50mm
5 (1 review)
Product Code: 227299
Recticel Eurowall Cavity Insulation Board 1200 x 450 x 50mm
Retail price

£13.26

per sheet
£11.05 ex. vat
Trade price
£10.60
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Rockwool Sound Insulation Slab 1200 x 400 x 100mm (2.88m2)
5 (2 reviews)
Product Code: 773734
Rockwool Sound Insulation Slab 1200 x 400 x 100mm (2.88m2)
Retail price

£57.89

per pack
£48.24 ex. vat
Trade price
£52.10
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Rockwool Sound Insulation Slab 1200 x 600 x 100mm (4.32m²)
Product Code: 773732
Rockwool Sound Insulation Slab 1200 x 600 x 100mm (4.32m²)
Retail price

£90.98

each
£75.82 ex. vat
Trade price
£81.89
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Rockwool Ablative Coated Batt 50mm x 1200mm x 600mm 0.72m2/ Pack
Product Code: 654815
Rockwool Ablative Coated Batt 50mm x 1200mm x 600mm 0.72m2/ Pack
Retail price

£35.23

each
£29.36 ex. vat
Trade price
£33.55
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Rockwool Sound Insulation Slab 1200 x 600 x 50mm (8.64m2)
5 (1 review)
Product Code: 773730
Rockwool Sound Insulation Slab 1200 x 600 x 50mm (8.64m2)
Retail price

£95.80

per pack
£79.83 ex. vat
Trade price
£83.24
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Knauf Insulation DriTherm 37 Cavity Insulation Slab  50mm  1200mm x 455mm
5 (1 review)
Product Code: 497107
Knauf Insulation DriTherm 37 Cavity Insulation Slab 50mm 1200mm x 455mm
Retail price

£56.00

per pack
£46.67 ex. vat
£4.67per item
Trade price
£48.01
Inc. VAT
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Knauf Insulation DriTherm 37 Cavity Insulation Slab 85mm 1200mm x 455mm
Product Code: 497094
Knauf Insulation DriTherm 37 Cavity Insulation Slab 85mm 1200mm x 455mm
Retail price

£54.66

per pack
£45.55 ex. vat
£6.83per item
Trade price
£46.86
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Knauf Acoustic Roll Ready Cut 75mm 14.50m 2 x 600 17.4m2 Per Pack
Product Code: 848623
Knauf Acoustic Roll Ready Cut 75mm 14.50m 2 x 600 17.4m2 Per Pack
Retail price

£186.08

per pack
£155.07 ex. vat
Trade price
£177.25
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Knauf Acoustic Roll Ready Cut 25mm 11.10m 4 x 600 26.64 m2 Per Pack
Product Code: 848595
Knauf Acoustic Roll Ready Cut 25mm 11.10m 4 x 600 26.64 m2 Per Pack
Retail price

£106.84

per pack
£89.03 ex. vat
Trade price
£101.76
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Recticel Eurowall Cavity Insulation Board 1200 x 450 x 90mm
Product Code: 227057
Recticel Eurowall Cavity Insulation Board 1200 x 450 x 90mm
Retail price

£15.74

per sheet
£13.12 ex. vat
Trade price
£12.60
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Recticel Eurowall+ Insulation Board 1200 x 450 x 90mm
Product Code: 227170
Recticel Eurowall+ Insulation Board 1200 x 450 x 90mm
Retail price

£29.53

per sheet
£24.61 ex. vat
Trade price
£28.13
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Knauf Dritherm Cavity Slab 37 150mm 455 x 1200mm 4.368m2
Product Code: 848622
Knauf Dritherm Cavity Slab 37 150mm 455 x 1200mm 4.368m2
Retail price

£67.12

per pack
£55.93 ex. vat
Trade price
£57.53
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Knauf Insulation OmniFit® Slab 50mm 1200x600 8.64m2
Product Code: 734014
Knauf Insulation OmniFit® Slab 50mm 1200x600 8.64m2
Retail price

£58.30

per pack
£48.58 ex. vat
£4.86per item
Trade price
£55.56
Inc. VAT
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Recticel Eurowall Cavity Insulation Board 1200 x 450 x 100mm
Product Code: 227158
Recticel Eurowall Cavity Insulation Board 1200 x 450 x 100mm
Retail price

£15.74

per sheet
£13.12 ex. vat
Trade price
£12.60
Inc. VAT
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Knauf Acoustic Roll Ready Cut 100mm 10.30m 3 x 400 12.36m2 Per Pack
Product Code: 848608
Knauf Acoustic Roll Ready Cut 100mm 10.30m 3 x 400 12.36m2 Per Pack
Retail price

£118.19

per pack
£98.49 ex. vat
Trade price
£112.55
Inc. VAT
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Knauf Insulation FrameTherm Roll 32 2800mm x 1140mm x 140mm
Product Code: 122531
Knauf Insulation FrameTherm Roll 32 2800mm x 1140mm x 140mm
Retail price

£156.07

per pack
£130.06 ex. vat
£78.03per item
Trade price
£140.48
Inc. VAT
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Actis Hybris Panels 170mm 2 Pack 2.74m2
Product Code: 447862
Actis Hybris Panels 170mm 2 Pack 2.74m2
Retail price

£69.82

per pack
£58.18 ex. vat
£34.91per item
Trade price
£66.48
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Kingspan Kooltherm K108 Cavity Board 1200mm x 450mm x 75mm
Product Code: 381869
Kingspan Kooltherm K108 Cavity Board 1200mm x 450mm x 75mm
Retail price

£150.43

per pack
£125.36 ex. vat
£25.07per item
Trade price
£143.28
Inc. VAT
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Knauf Insulation FrameTherm Roll 35 3900mm x 1140mm x 140mm
5 (1 review)
Product Code: 705826
Knauf Insulation FrameTherm Roll 35 3900mm x 1140mm x 140mm
Retail price

£104.33

per pack
£86.94 ex. vat
£52.16per item
Trade price
£99.37
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Rockwool Sound Slab 1200 x 600 x 70mm 5.76m2
Product Code: 773731
Rockwool Sound Slab 1200 x 600 x 70mm 5.76m2
Retail price

£116.40

per pack
£97.00 ex. vat
Trade price
£110.57
Inc. VAT
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Knauf Insulation Rocksilk RS45 Slab 1200mm x 600mm x 100mm
Product Code: 221584
Knauf Insulation Rocksilk RS45 Slab 1200mm x 600mm x 100mm
Retail price

£87.23

per pack
£72.69 ex. vat
£17.45per item
Trade price
£78.50
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Showing 1—30 items of 51

Related products

5 (7 reviews)
An A1 Non-Combustible multi-application Glass Mineral Wool slab, manufactured using Knauf Insulation's unique ECOSE® Technology, and designed for use in multiple applications in both timber and steel frame construction to allow flexibility across a range of projects.
Brand Name
Knauf Insulation
Length
1200 mm
Thickness
100 mm
Width
600 mm
Material
Glass Mineral Wool
Usage
Multi-Application, Ground floors, Internal floors, Pitched roofs at rafter level, Internal walls / partitions, Light steel frame walls, Timber frame walls
Coverage
4.32m2
Fire Retardant
Y
Acoustic
Yes
Thermal Conductivity
0.035 W/mK
Pack Quantity
6
Certifications Met
Euroclass A1 Reaction to Fire Classification, Eurofins Gold
Type
Insulation Slabs

£80.20

per pack (Inc. VAT)
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Celotex CW4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 40mm to 100mm, it can be considered for use in partial fill cavity wall applications.
Length
1200 mm
Thickness
85 mm
Width
450 mm
Material
PIR
Coverage
0.54 m2
Thermal Conductivity
0.022 W/mK
Certifications Met
BBA Certificate Number 16/5343
Type
Insulation Boards
Dimension 1
1200.0
Dimension 2
450.0
Dimension 3
85.0
Made To Order
N
Manufacturer Model No
CW4085
Brand Name
Celotex
Range Description
Insulation Board

£15.72

per sheet (Inc. VAT)
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A universal insulation board for use in pitched roofs, walls and floors. Comprises a fibre free rigid PIR insulation core faced with an aluminium foil composite on both sides.
Manufacturer Model No
PR150
Brand Name
Ecotherm
Length
2400 mm
Thickness
150 mm
Width
1200 mm
Type
Roof Insulation

£153.10

per sheet (Inc. VAT)
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5 (3 reviews)
Celotex GA4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 50mm to 100mm, it can be considered for roof, wall andfloor applications.
Length
2400 mm
Thickness
50 mm
Width
1200 mm
Material
PIR
Coverage
2.88 m2
Thermal Conductivity
0.022 W/mK
Certifications Met
BBA Certificate Number 16/5352 BBA Certificate Number 17/5405
Type
Insulation Boards
Range Description
Insulation Board
Brand Name
Celotex
Manufacturer Model No
GA4050
Made To Order
N

£49.80

per sheet (Inc. VAT)
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Knauf Insulation OmniFit® Insulation Slab 1200mm x 600mm x 100mm
Knauf Insulation OmniFit® Insulation Slab 1200mm x 600mm x 100mm
An A1 Non-Combustible multi-application Glass Mineral Wool slab, manufactured using Knauf Insulation's unique ECOSE® Technology, and designed for use in multiple applications in both timber and steel frame construction to allow flexibility across a range of projects.
£80.20 per pack (Inc. VAT)
85mm x 1200mm x 450mm Celotex PIR Cavity Wall Insulation Board CW4000
85mm x 1200mm x 450mm Celotex PIR Cavity Wall Insulation Board CW4000
Celotex CW4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 40mm to 100mm, it can be considered for use in partial fill cavity wall applications.
£15.72 per sheet (Inc. VAT)
150mm x 2400mm x 1200mm Ecotherm Eco-versal Pitched Roof Insulation PR150
150mm x 2400mm x 1200mm Ecotherm Eco-versal Pitched Roof Insulation PR150
A universal insulation board for use in pitched roofs, walls and floors. Comprises a fibre free rigid PIR insulation core faced with an aluminium foil composite on both sides.
£153.10 per sheet (Inc. VAT)
50mm x 2400mm x 1200mm Celotex PIR Insulation Board GA4000
50mm x 2400mm x 1200mm Celotex PIR Insulation Board GA4000
Celotex GA4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 50mm to 100mm, it can be considered for roof, wall andfloor applications.
£49.80 per sheet (Inc. VAT)