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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 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

£38.56

per pack
£32.13 ex. vat
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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

£58.72

per pack
£48.93 ex. vat
£4.89per item
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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

£81.73

per pack
£68.11 ex. vat
£40.87per item
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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

£109.61

per pack
£91.34 ex. vat
£54.80per item
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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

£59.14

per pack
£49.28 ex. vat
£9.86per item
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Knauf Acoustic Roll Ready Cut 25mm 11.10m 4 x 600 26.64m2 Per Pack
Product Code: 848595
Knauf Acoustic Roll Ready Cut 25mm 11.10m 4 x 600 26.64m2 Per Pack
Retail price

£101.02

per pack
£84.18 ex. vat
£25.25per item
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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

£55.19

per pack
£45.99 ex. vat
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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

£50.41

per pack
£42.01 ex. vat
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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

£8.18

per sheet
£6.82 ex. vat
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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

£176.02

per pack
£146.68 ex. vat
£88.01per item
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Knauf Insulation Rocksilk RS45 50mm 7.20m2
Product Code: 221587
Knauf Insulation Rocksilk RS45 50mm 7.20m2
Retail price

£73.49

per pack
£61.24 ex. vat
£7.35per item
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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

£55.02

per pack
£45.85 ex. vat
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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

£86.47

each
£72.06 ex. vat
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Rockwool Sound Insulation Slab 1200 x 600 x 50mm (8.64m�)
5 (1 review)
Product Code: 773730
Rockwool Sound Insulation Slab 1200 x 600 x 50mm (8.64m�)
Retail price

£86.36

per pack
£71.97 ex. vat
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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

£33.47

each
£27.89 ex. vat
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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

£74.14

per pack
£61.78 ex. vat
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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

£60.43

per pack
£50.36 ex. 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

£18.60

per sheet
£15.50 ex. vat
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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

£52.49

per pack
£43.74 ex. 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

£111.83

per pack
£93.19 ex. vat
£37.28per item
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Knauf Dritherm Cavity Slab 32 85mm 455 x 1200mm 2.73m2 Per Pack
Product Code: 848626
Knauf Dritherm Cavity Slab 32 85mm 455 x 1200mm 2.73m2 Per Pack
Retail price

£65.22

per pack
£54.35 ex. vat
£13.04per item
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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

£22.43

per sheet
£18.69 ex. vat
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Knauf Insulation Masonry Party Wall Slab 75mm 8.74m2
Product Code: 295475
Knauf Insulation Masonry Party Wall Slab 75mm 8.74m2
Retail price

£552.50

per pack
£460.42 ex. vat
£34.53per item
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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

£67.09

per pack
£55.91 ex. vat
£33.55per item
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Kingspan Kooltherm K106 Full Fill Cavity Wall Insulation Board 1200mm x 450mm x 90mm
Product Code: 881334
Kingspan Kooltherm K106 Full Fill Cavity Wall Insulation Board 1200mm x 450mm...
Retail price

£174.20

per pack
£145.17 ex. vat
£43.55per item
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Actis Hybris Panels 205mm 2 Pack 2.74m2
Product Code: 447791
Actis Hybris Panels 205mm 2 Pack 2.74m2
Retail price

£80.96

per pack
£67.47 ex. vat
£40.48per item
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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

£147.65

per pack
£123.04 ex. vat
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Recticel Eurowall Cavity Insulation Board 1200 x 450 x 75mm
Product Code: 227313
Recticel Eurowall Cavity Insulation Board 1200 x 450 x 75mm
Retail price

£12.83

per sheet
£10.69 ex. vat
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Knauf Insulation Timber Frame Party Wall Slab 60mm 11.52m2
Product Code: 295477
Knauf Insulation Timber Frame Party Wall Slab 60mm 11.52m2
Retail price

£154.69

per pack
£128.91 ex. vat
£9.67per item
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Recticel Eurowall Cavity Insulation Board 1200 x 450 x 70mm
Product Code: 227129
Recticel Eurowall Cavity Insulation Board 1200 x 450 x 70mm
Retail price

£18.60

per sheet
£15.50 ex. vat
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Showing 1—30 items of 53

Related products

An A1 Non-Combustible Rock Mineral Wool slab, manufactured using Knauf Insulation's unique ECOSE® Technology and designed for use in multiple applications including internal partitions, timber and metal studs, and in between timber rafters and floor joists.
Depth
50 mm
Length
1200 mm
Thickness
50 mm
Width
600 mm
Material
Rock Mineral Wool
Colour
Brown
Acoustic
Yes
Thermal Conductivity
0.035 W/mK
Coverage
7.2m2
Pack Quantity
10
Certifications Met
Euroclass A1 Reaction to Fire Classification, Eurofins Gold
Type
Insulation Slabs
Brand Name
Knauf Insulation
Range Description
Rock Universal Slab

£73.49

per pack (Inc. VAT)
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An A1 Non-Combustible Rock Mineral Wool slab, manufactured using Knauf Insulation's unique ECOSE® Technology and designed for use in multiple applications including internal partitions, timber and metal studs, and in between timber rafters and floor joists.
Range Description
Rock Universal Slab
Brand Name
Knauf Insulation
Length
1200 mm
Thickness
100 mm
Width
600 mm
Material
Rock Mineral Wool
Coverage
3.6m2
Acoustic
Yes
Thermal Conductivity
0.035 W/mK
Pack Quantity
5
Certifications Met
Euroclass A1 Reaction to Fire Classification, Eurofins Gold
Type
Insulation Slabs

£83.22

per pack (Inc. VAT)
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5 (2 reviews)
This insulation board by Kay-Metzeler is manufactured in expanded polystyrene that features high compressive strength. This board is covered with a highly resistant fibre-woven film and this covering overhangs the board by 50mm, enabling the overlaps to be taped to form a continuous, seamless surface. Ideal under screed as an insulation solution. Provides coverage area of 34.56m2.
Length
2400 mm
Thickness
25 mm
Width
1200 mm
Material
Polystyrene
Coverage
34.56m2
Brand Name
Kay Metzeler
Manufacturer Model No
FS688

£16.58

per sheet (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
50 mm
Width
450 mm
Material
PIR
Coverage
0.54 m2
Fire Retardant
N
Acoustic
N
Thermal Conductivity
0.022 W/mK
Certifications Met
BBA Certificate Number 16/5343
Type
Insulation Boards
Range Description
Insulation Board
Brand Name
Celotex
Country Origin
UK
Manufacturer Model No
CW4050
Made To Order
N

£8.17

per sheet (Inc. VAT)
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Knauf Insulation Rocksilk RS45 50mm 7.20m2
Knauf Insulation Rocksilk RS45 50mm 7.20m2
An A1 Non-Combustible Rock Mineral Wool slab, manufactured using Knauf Insulation's unique ECOSE® Technology and designed for use in multiple applications including internal partitions, timber and metal studs, and in between timber rafters and floor joists.
£73.49 per pack (Inc. VAT)
Knauf Insulation Rocksilk RS45 Slab 1200mm x 600mm x 100mm
Knauf Insulation Rocksilk RS45 Slab 1200mm x 600mm x 100mm
An A1 Non-Combustible Rock Mineral Wool slab, manufactured using Knauf Insulation's unique ECOSE® Technology and designed for use in multiple applications including internal partitions, timber and metal studs, and in between timber rafters and floor joists.
£83.22 per pack (Inc. VAT)
25mm x 2400mm x 1200mm Kay-Metzeler Expanded Polystyrene Insulation EPS70
25mm x 2400mm x 1200mm Kay-Metzeler Expanded Polystyrene Insulation EPS70
This insulation board by Kay-Metzeler is manufactured in expanded polystyrene that features high compressive strength. This board is covered with a highly resistant fibre-woven film and this covering overhangs the board by 50mm, enabling the overlaps to be taped to form a continuous, seamless surface. Ideal under screed as an insulation solution. Provides coverage area of 34.56m2.
£16.58 per sheet (Inc. VAT)
50mm x 1200mm x 450mm Celotex PIR Cavity Wall Insulation Board CW4000
50mm 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.
£8.17 per sheet (Inc. VAT)