Cavity Wall Insulation

Cavity Wall Insulation stores the heat within the inner walls. Full range of Cavity Wall Insulation Boards supplied by Build4less. We stock the best brands from Kingspan & Celotex to Ballytherm and many more. Contact us on Live Chat or by phone 020 3481 1978 if you require any help - Nationwide Delivery
Celotex CW4000 Cavity Wall Insulation Board 450mm x 1200mm - All Sizes
Celotex CW4000 Cavity Wall Insulation Board 450mm x 1200mm - All Sizes - Celotex Insulation
Vendor
Celotex
Regular price
from £45.08 £54.10
Sale price
from £45.08 £54.10
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£0.00
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Kingspan Kooltherm K108 Cavity Board (All Sizes) 1200mm x 450mm
Vendor
Kingspan
Regular price
from £96.50 £115.80
Sale price
from £96.50 £115.80
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£0.00
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Kingspan Kooltherm K106 90mm x 1.2m x 0.45m (2.16m2)
Vendor
Kingspan
Regular price
£82.50 £99.00
Sale price
£82.50 £99.00
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£0.00
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Kingspan Thermawall TW50 Cavity Wall Board 450mm x 1200mm - All Sizes
Kingspan Thermawall TW50 Cavity Wall Board 450mm x 1200mm - All Sizes - Kingspan Insulation
Vendor
Kingspan
Regular price
from £40.96 £49.15
Sale price
from £40.96 £49.15
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£0.00
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Kingspan Kooltherm Cavity Closers - All Sizes
Vendor
Kingspan
Regular price
from £17.22 £20.66
Sale price
from £17.22 £20.66
Regular price
£0.00
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Kingspan Kooltherm K12 Framing Board (All Sizes) - 2.4m x 1.2m
Kingspan Kooltherm K12 Framing Board 1.2m x 2.4m - All Sizes - Kingspan Insulation
Vendor
Kingspan
Regular price
from £252.36 £302.83
Sale price
from £252.36 £302.83
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£0.00
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Recticel Eurothane Cavitywall 1.2m x 0.45m - All Sizes
Recticel Eurothane Cavitywall
Vendor
Recticel
Regular price
from £0.00 £0.00
Sale price
from £0.00 £0.00
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£0.00
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per 
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Mannok Cavity 0.45m x 1.2m All Sizes
Quinntherm Cavity 0.45m x 1.2m All Sizes - Quinntherm Insulation
Vendor
Mannok
Regular price
from £49.00 £58.80
Sale price
from £49.00 £58.80
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£0.00
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Rockwool RW3 (All Sizes)
Vendor
Rockwool
Regular price
from £394.90 £473.88
Sale price
from £394.90 £473.88
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£0.00
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Rockwool RW5 (All Sizes)
Vendor
Rockwool
Regular price
from £691.65 £829.98
Sale price
from £691.65 £829.98
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£0.00
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Rockwool Cladding Roll - All Sizes
Vendor
Rockwool
Regular price
from £0.00 £0.00
Sale price
from £0.00 £0.00
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£0.00
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Rockwool Cavity (All Sizes)
Vendor
Rockwool
Regular price
from £600.44 £720.53
Sale price
from £600.44 £720.53
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£0.00
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Knauf Dritherm Cavity Slab 37 (All Sizes) 1200mm x 455mm
Knauf Dritherm 37 (All Sizes) 1200mm x 455mm
Vendor
Knauf
Regular price
from £33.03 £39.64
Sale price
from £33.03 £39.64
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£0.00
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Knauf Dritherm Cavity Slab 32 (455mm x 1200mm) - All Sizes
Knauf Earthwool Dritherm 32 (455mm x 1200mm) - All Sizes
Vendor
Knauf
Regular price
from £34.90 £41.88
Sale price
from £34.90 £41.88
Regular price
£0.00
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Knauf DriTherm Cavity Slab 34 (All Sizes)
Knauf Earthwool DriTherm 34 (All Sizes) - Knauf Earthwool Insulation
Vendor
Knauf
Regular price
from £1,135.72 £1,362.86
Sale price
from £1,135.72 £1,362.86
Regular price
£0.00
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Speedline PVCU Ext. XPS. Cavity Closer, 100mm x 2.4m Single Ext (Pack of 10)
Vendor
Speedline
Regular price
£83.30 £99.96
Sale price
£83.30 £99.96
Regular price
£0.00
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Ballytherm cavity 0.45m x 1.2m All Sizes
Ballytherm cavity
Vendor
Ballytherm
Regular price
from £58.06 £69.67
Sale price
from £58.06 £69.67
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£0.00
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Eco Cavity 0.45m x 1.2m All Sizes
Eco Cavity 0.45m x 1.2m All Sizes - Ecotherm
Vendor
Ecotherm
Regular price
from £40.19 £48.23
Sale price
from £40.19 £48.23
Regular price
£0.00
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per 
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HControl Hybrid 45mm x 1.6m x 6.25m (Roll size 10m2)
HControl Hybrid 45mm x 1.6m x 6.25m (Roll size 10m2) - Actis Insulation
Vendor
Actis
Regular price
£79.33 £95.20
Sale price
£79.33 £95.20
Regular price
£0.00
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Thin-R Cavity 60mm
Vendor
Unilin
Regular price
£40.89 £49.07
Sale price
£40.89 £49.07
Regular price
£0.00
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Thermaclass Cavity Wall 21 (1190mm x 450mm) - All Sizes
Thermaclass Cavity Wall 21 (1190mm x 450mm) - All Sizes - Celotex Insulation
Vendor
Celotex
Regular price
from £1,122.22 £1,346.66
Sale price
from £1,122.22 £1,346.66
Regular price
£0.00
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Sheepwool Loose Wool - 5Kg Pack
Sheepwool Loose Wool - 5Kg Pack - Sheepwool Insulation
Vendor
Sheepwool
Regular price
£41.66 £49.99
Sale price
£41.66 £49.99
Regular price
£0.00
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per 
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Window and Door Filler Untied 200m Roll
Window and Door Filler Untied 200m Roll - Sheepwool Insulation
Vendor
Sheepwool
Regular price
£75.55 £90.66
Sale price
£75.55 £90.66
Regular price
£0.00
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High Density EPS 200E 90mm x 600mm x 1200mm (Pack of 6)
High Density EPS 200E 90mm x 600mm x 1200mm (Pack of 6) - EPS External Wall Insulation.
Vendor
EPS
Regular price
£130.44 £156.53
Sale price
£130.44 £156.53
Regular price
£0.00
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High Density EPS 200E 80mm x 600mm x 1200mm (Pack of 7)
High Density EPS 200E 80mm x 600mm x 1200mm (Pack of 7) - EPS External Wall Insulation.
Vendor
EPS
Regular price
£132.54 £159.05
Sale price
£132.54 £159.05
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£0.00
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High Density EPS 200E 50mm x 600mm x 1200mm (Pack of 12)
High Density EPS 200E 50mm x 600mm x 1200mm (Pack of 12) - EPS External Wall Insulation.
Vendor
EPS
Regular price
£124.11 £148.93
Sale price
£124.11 £148.93
Regular price
£0.00
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per 
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High Density EPS 200E 40mm x 600mm x 1200mm (Pack of 15)
High Density EPS 200E 40mm x 600mm x 1200mm (Pack of 15) - EPS External Wall Insulation
Vendor
EPS
Regular price
£124.44 £149.33
Sale price
£124.44 £149.33
Regular price
£0.00
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per 
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High Density EPS 200E 30mm x 600mm x 1200mm (Pack of 20)
High Density EPS 200E 30mm x 600mm x 1200mm (Pack of 20) - EPS External Wall Insulation
Vendor
EPS
Regular price
£124.44 £149.33
Sale price
£124.44 £149.33
Regular price
£0.00
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per 
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High Density EPS 200E 20mm x 600mm x 1200mm (Pack of 30)
High Density EPS 200E 20mm x 600mm x 1200mm (Pack of 30) - EPS External Wall Insulation
Vendor
EPS
Regular price
£124.44 £149.33
Sale price
£124.44 £149.33
Regular price
£0.00
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Cavity wall insulation is an essential component in modern construction, offering energy efficiency and comfort to buildings. At Build4Less, we provide a comprehensive range of insulation solutions tailored to meet various requirements and budgets.

Types of Cavity Wall Insulation Products

Polyisocyanurate (PIR) Boards

Products like the Celotex CW4000 and Kingspan Kooltherm series are premium PIR boards known for their excellent thermal performance and compressive strength. These boards are easy to handle and install, making them ideal for new construction and refurbishment projects.

Mineral Wool Insulation

Rockwool products, such as RW3, RW5, and Rockwool Cavity, offer superb acoustic insulation, fire resistance, and thermal properties. These are particularly suited for projects where fire safety and sound reduction are priorities.

Glass and Stone Wool Slabs

Knauf Dritherm Cavity Slabs are non-combustible, water-repellent glass mineral wool slabs that provide thermal and acoustic insulation in cavity walls. They are designed to maintain their structural integrity over time, ensuring long-lasting performance.

Expanded Polystyrene (EPS) Boards

High-density EPS 200E boards are versatile and cost-effective insulation solutions. They are suitable for various applications, including cavity wall insulation, due to their excellent resistance to moisture and high insulation values.

Cavity Closers

Kingspan Kooltherm Cavity Closers prevent thermal bridging and provide a clean finish around openings in cavity walls. These are essential for energy-efficient construction, ensuring that the insulation continuity is maintained around windows and doors.

Specialty Insulation Products

Products like Sheepwool Loose Wool and Window and Door Filler provide sustainable and natural alternatives for cavity wall insulation, offering breathability and moisture control.

Hybrid Insulation Materials

Hybrid materials such as HControl Hybrid combine insulation with a reflective surface to provide a unique solution for thermal regulation, while Thin-R Cavity offers a slim-profile PIR solution for tight spaces.

Selecting the Right Insulation

When choosing cavity wall insulation:

  • Consider the U-value requirements for your project; lower U-values mean better insulation.
  • Evaluate the fire rating needed, especially for high-risk areas or multi-story buildings.
  • Think about acoustic needs; if sound insulation is a priority, mineral wool may be the best choice.
  • Assess the space available; if the cavity is narrow, slim-profile boards like Thin-R Cavity could be ideal.
  • For eco-friendly projects, consider natural options like Sheepwool products.
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