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CAVITY WALL 

CAVITY WALL 

Generally speaking, cavity wall insulation (CWI) acts like a blanket that stops heat escaping. It is made up of two walls with a gap in between, known as the cavity. The gap between them can be filled with insulating material. The outer leaf is usually made of brick and the inner layer of brick or concrete block. If your house was built after the 1920s, it is likely to have cavity walls. If so, the bricks will usually have an even pattern with all the bricks laid lengthways. A way to tell if you have a cavity wall or not is to check the brickwork on the outside of your home. You can also tell a cavity wall by measuring its width. If the wall is more than 260mm thick, it is most likely a cavity wall. A much narrower wall suggests that it's a solid wall. If solid walls, the bricks will have an alternating pattern, with some bricks laid across the wall so you can see the smaller ends from the outside. Cavity wall insulation can be in the form of slabs or sheets fitted as the walls go up (the most common option on a self-build), or retrofitted material that’s blown in once the main envelope is constructed.

CAVITY WALL INSULATION

Cavity wall insulation is an insulating material which is placed in the gap between the inner and outer wall of your property, making it more energy-efficient. Most common types of cavity wall insulation used are:

  • Polystyrene Beads,
  • Blown Mineral Fibre,
  • Mineral Wool Slabs,
  • Rigid Foam.

In the case of cavity wall insulation, you must first of all consider water retention and fire resistance as well as the quality of air indoors for your home. This is the reason why these four materials are used more often in concurrence with cavity walls.

POLYSTYRENE BEADS

These are pushed into the cavity of the walls, which is mixed with an adhesive which sticks the beads together to avoid being spilled outside of the wall. This type of insulation is usually used in narrower cavity walls rather than using mineral wool insulation and is also preferred in some stone built houses or properties. Polystyrene beads may be supplied loose or in a light sticky resin to hold them together. Polystyrene granules will stick together of their own accord due to their rough shape. Polystyrene has low thermal conductivity, which makes the material have a long term R-value, meaning it is resistant to heat flow and an ideal product for thermal insulation. EPS bead does not absorb moisture and its thermal properties are not affected by damp, humidity or moisture. Its closed-cell means it cannot absorb water and the bead will maintain its shape, size, structure and appearance. Polystyrene beads are more popular than alternative materials – mineral fibre and expanding foam – because they are more effective at keeping the heat in, and don't absorb moisture. Beads are also quicker to install as they can be blown easily and far into the cavity, reaching awkward areas. 

BLOWN MINERAL FIBRE

Blown mineral fibre consists of strands of fibreglass or mineral wool that are forced into the cavity using compressed air. This material can be used in any part of the country and is covered by British Board of Agrement (BBA) certificates. 

MINERAL WOOL SLABS

Mineral wool insulation is one of the most commonly used materials when it comes to cavity wall insulation. It’s easy to slide between the joists, can be packed tightly and also pre-cut to suit joist widths. The flexibility of glass mineral wool batts affords the capability to accommodate small variations in cavity width, such as those caused by mortar snots. Glass mineral wool products benefit from the batts being effectively knitted together, offering a continuous thermal envelope. Glass mineral wool products such as those in the ISOVER range can achieve Euroclass A1 Reaction to Fire classification and have excellent acoustic insulation properties. The thermal performance of glass mineral wool is typically around 0.034W/m.K, depending on the product and when installed across the whole width of the cavity wall, achieving a thermal performance roughly equal to partial fill PIR cavity wall insulation.

RIGID FOAM BOARDS

If you were building a new property or extending you would normally install it in the cavities or in the stud work during construction. They come in three main types:

  • PIR Boards,
  • Phenolic Boards
  • EPS Boards.

PIR BOARDS

PIR boards are made by mixing chemicals with a blowing agent. This forms large rigid blocks which are low density, closed cell insulation sheets. The gas which is trapped in the closed cells of the insulation has a very low thermal conductivity. This low thermal conductivity makes the insulation perform better than if it just had air trapped in the cells. They come in different types but the most common type has an aluminium foil backing to each side which makes them easily recognisable. The addition of an aluminium foil facer helps improve the thermal performance of any air cavity the PIR board faces into. Moreover, they are very nearly as thermally efficient as phenolic boards and cheaper then phenolic boards. PIR boards tend to offer the optimum performance vs price ratio as they’re pretty close to phenolic boards when it comes to r-value and yet they’re cheaper. Although you will need a slightly thicker board to achieve the same r-value.

PHENOLIC BOARDS

Phenolic board are probably the most thermally efficient insulation products used at present. It has a slightly higher r-value and a slightly thinner profile than PIR boards due to the manufacturing process. It offers the thinnest insulation boards for a given specific u-value. As they’re closed cells they shouldn’t absorb moisture or water vapour, unlike open cell products. However, phenolic boards will likely be the most expensive of all the rigid foam insulation options. If you wanted an R-value of 4.5 for each type of rigid foam insulation boards, you’d need the following approximate thicknesses: PIR – 100mm ǀ Phenolic – 90mm ǀ EPS – 170mm

EPS EXPANDED POLYSTYRENE

EPS is the most basic cavity insulation board and the one with the lowest R-value. It is also the cheapest of the three rigid insulation boards. Board doesn’t have a closed cell structure as it is basically a mass of polystyrene balls moulded together into a block. However, it can allow water to penetrate over time and to achieve similar r-values or u-values to PIR or Phenolic boards you’ll need a much thicker block of insulation.

TYPES OF CAVITY WALL

Choosing between full and partial fill installation and subsequently selecting the correct insulation type is essential in terms of compliance with Building Regulations and is crucial to the energy performance and the carbon footprint of a building. There are two types of Cavity Wall Insulation : Full Fill Cavity or Partial Fill Cavity.

FULL FILL CAVITY

Full fill cavity insulation fits closely against the brick and block of the wall construction with no sagging or slumping. As a rigid full-fill insulation solution, the product ensures a resistance to fire spread between and within cavities. It acts as a barrier when tightly fitted between masonry leaves where an insulated wall connects with an uninsulated wall cavity. Full fill cavity insulation must be weatherproof to provide protection against bad weather, and it must be water repellant to resist the passage of moisture. Full fill cavity wall insulation differs from a partial wall in that the entire space of the cavity is filled with insulation without leaving an air gap. Full fill cavity wall insulation allows more of the cavity between the inner and outer leaf to be filled with insulation, providing a much better insulated structure without increasing the wall width. Full-fill built-in insulation solutions are installed as the walls are built, with slabs being friction-fitted between the inner and outer leaves of the wall and in between wall ties. There is a variety of products available for full fill cavity insulation: PIR, Glass Mineral Wool and Blown Insulation. All of the solutions are designed to prevent moisture movement through the cavity.

PARTIAL FILL CAVITY

A partial fill cavity features thermal insulation secured back to the inner SFS frame, leaving a cavity of air between the insulation and the masonry outer leaf and can be used on buildings of any height. It simply involves leaving a gap between the outer face of the insulation and the external leaf. Using insulation below the slab helps maintain steady internal temperatures in the building by bringing the ground bearing concrete slab into the insulated envelope of the building making use of the concrete thermal mass. Partial fill wall insulation typically requires a 50mm cavity to be maintained. Here are some examples of the available insulation for full and partial fill cavity wall installation:

  • DriTherm Cavity Insulation Slab- Knauf
  • CW4000 Partial Fill Cavity Wall Insulation Board-Celotex
  • Full Fill Cavity Batt-Rockwool
  • High Performance Partial Fill Cavity Slab-Rockwool
  • Xtratherm XT/CW Thin-R 
  • Xtratherm CT/PIR CavityTherm Thin-R 

COST OF CAVITY WALL INSULATION

Insulating your cavity walls is a simple and effective way to reduce your heating bills and have a warmer home in winter. You should be able to make back the installation cost in five years or less due to the yearly energy bill savings you will make. With fuel costs on the rise, now is a good time to invest in cavity wall insulation. You might not see the same pound-for-pound reduction in energy bills as you once would have, but you will be using less energy – so you’ll be protecting yourself against upcoming energy price hikes. Cavity wall insulation can cut your heating bills so much that it will pay for itself quickly.

 

Related articles:

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Cavity wall. All you need to know

Building regs part L changes. What is all about?

Best 6 passive fire protection cavity barriers

4 types of full fill cavity insulation explained

Cheaper alternative/equivalent to kingspan insulation

Video credit: https://www.youtube.com/watch?v=wdsZVhieZrc

 

Brand: Unilin Insulation (UK) known as Xtratherm Model: 100mm Fire Rated Cavity Closer
100mm Unilin Close-R Fire Rated Cavity Closer, a rigid phenolic core between foil facings and stone wool wrapped in a protective red sleeve to achieve a minimum 60 minutes fire resistance. Safe-R Close-R Cavity Closer achieves an excellent fire rating and allows for the correct placement of wall ..
  • 100mm Unilin Safe-R Close-R Insulated Fire Rated Cavity Closer FR
  • Cavity Closer achieves an excess of 4 hour fire rating in a 150mm cavity
  • Fire Rated Cavity Closer is used around window and door openings
  • Safe-R Close-R is preventing cold bridging, damp penetration and condensation
  • Suites 100 - 150mm cavities and meets Building Regulations requirements
£ 154.80
Ex Tax:£ 129.00
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 100mm Unilin ECO/CW
100mm Unilin ECO/CW Cavity Wall 360 is a partial fill cavity wall insulation board, a rigid PIR insulation core with textured robust low emissivity foil facings and engineered shiplap jointing. Unilin ECO/CW 360 cavity system incorporates robust facings, engineered jointing details, preformed cor..
  • 100mm x 450mm x 1200mm Unilin ECO/CW 360 Cavity Wall Insulation
  • Partial fill cavity wall insulation board with an engineered shiplap jointing
  • ECO/CW can achieve a Passive U-Value of 0.15 W/m2K in a traditional cavity wall
  • Minimising the threat of Thermal Bridging and improving the U-Value of the wall
  • Premium modified PIR insulation core with textured robust low emissivity foil facings
£ 137.88
Ex Tax:£ 114.90
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 100mm Cavity Closer Checked Fit
100mm XT/CL Close-R Checked fit (Brick Outer) is a cavity closer used for closing the cavities around window and door openings, preventing cold bridging, damp penetration and condensation. Unilin Close-R XT/CL Reveal Closers range is used to close cavities and is suited to all types of windows an..
  • 100mm Unilin XT/CL Close-R PIR Insulated Cavity Closer Checked Fit
  • Checked Fit (Brick Outer) Cavity Closer used for closing the cavities
  • XT/CL Close-R is used around window and door openings
  • Close-R is preventing cold bridging, damp penetration and condensation
  • Suites 100 - 150mm cavities - meets Building Regulations requirements
£ 129.60
Ex Tax:£ 108.00
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 100mm Cavity Closer Flanged Fit
100mm XT/CL Close-R Flanged fit (Concrete Outer) is a cavity closer used for closing the cavities around window and door openings, preventing cold bridging, damp penetration and condensation. Unilin Close-R XT/CL Reveal Closers range is used to close cavities and is suited to all types of windows..
  • 100mm Unilin XT/CL Close-R PIR Insulated Cavity Closer Flanged Fit
  • Flanged fit (Concrete Outer) Cavity Closer used for closing the cavities
  • XT/CL Close-R is used around window and door openings
  • Close-R is preventing cold bridging, damp penetration and condensation
  • Suites 100 - 150mm cavities - meets Building Regulations requirements
£ 129.60
Ex Tax:£ 108.00
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 110mm ECO/CT CavityTherm
110mm Unilin ECO/CT CavityTherm 360 is an engineered full fill cavity insulation system providing added resilience against increases in wind-driven rain resulting from climate change. When built into a traditional 110-150mm cavity using standard foundation widths and local building materials ECO/..
  • 110mm CavityTherm ECO/CT Unilin Full Fill Cavity Insulation Board
  • Unilin ECO/CT 360 (CavityTherm) achieves U-Values down to 0.12 W/m2K
  • Lambda value of 0.020 W/mK with pioneering environmentally sensitive features
  • Minimising the threat of Thermal Bridging and improving the U-Value of the wall
  • Meets both the Climate Challenge 2030 and Low Energy Transformation Initiative
£ 137.88
Ex Tax:£ 114.90
Estimated delivery: 5-7 working days
Brand: Leviat-Ancon® Model: 155mm Teplo-BFL-5-Tie
155mm Ancon Teplo-BFL-5 Cavity Wall Tie is suitable for 76-100mm cavities, an ultra-low thermal conductivity wall tie can be fixed to concrete, masonry, steel and timber substrates. Teplo-BFL Tie is an ideal where a low thermal conductivity restraint fixing is required to minimise heat loss acros..
  • 155mm Ancon Teplo-BFL-5 Cavity Wall Tie - suitable for 76-100mm cavities
  • An ultra-low thermal conductivity cavity wall tie (restraint fixing for cavities)
  • Teplo-BFL-5 can be fixed to concrete, masonry, steel and timber substrates
  • Minimise heat loss across an insulated cavity, improving the energy efficiency
  • Ribbed shank acts as an integral water drip, preventing water from crossing the cavity
£ 5.94
Ex Tax:£ 4.95
Estimated delivery: 3-5 working days
Brand: Leviat-Ancon® Model: 155mm Teplo-BFL-7 Wall Tie
155mm Teplo-BFL-7 Ancon Cavity Wall Tie (7mm diameter) is suitable for 76-100mm cavities, an ultra-low thermal conductivity wall tie that can be fixed to concrete, masonry, steel and timber. Teplo BFL Tie is an ideal where a low thermal conductivity restraint fixing is required to minimise heat l..
  • 155mm Teplo BFL-7 Ancon Cavity Wall Tie Suitable for 76-100mm cavities
  • An ultra-low thermal conductivity cavity wall tie (restraint fixing for cavities)
  • Teplo-BFL-7 can be fixed to concrete, masonry, steel and timber substrates
  • Minimise heat loss across an insulated cavity, improving the energy efficiency
  • Ribbed shank acts as an integral water drip, preventing water from crossing the cavity
£ 6.24
Ex Tax:£ 5.20
Estimated delivery: 3-5 working days
Brand: Leviat-Ancon® Model: L-Tie 165-5
165mm Ancon Teplo-L-Tie (5mm Diameter Cavity Brick Tie) is a super-low thermal conductivity premium wall tie manufactured from basalt fibres set in a resin matrix to cut down the heat loss across an insulated cavity, improving the energy efficiency of a masonry cavity wall. The 165mm Teplo-L-Tie ..
  • Suitable for Cavities of: 83mm to 100mm
  • For Buildings requiring 120 Minutes fire resistance
  • BBA Approval and in line with NHBC standards
  • 5mm fixing hole for a secondary fixing
  • Teplo-L-Tie is an ultra-low thermal conductivity wall tie
£ 3.85
Ex Tax:£ 3.21
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: L-Tie 165-7
165mm Ancon Teplo-L-Tie (7mm Fixing Hole Cavity Brick Tie) is a super-low thermal conductivity premium wall tie manufactured from basalt fibres set in a resin matrix to cut down the heat loss across an insulated cavity, improving the energy efficiency of a masonry cavity walls. The 165mm Teplo-L-..
  • Suitable for Cavities of: 83mm to 100mm
  • For Buildings requiring 120 Minutes fire resistance
  • BBA Approval and in line with NHBC standards
  • 7mm fixing hole for a secondary fixing
  • Teplo-L-Tie (7) is an ultra-low thermal conductivity wall-tie
£ 5.47
Ex Tax:£ 4.56
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: Type-1 BF-1
200mm Ancon Teplo BF1 Wall Tie is a Masonry Heavy Duty Type BF 1 composite cavity wall tie manufactured from pultruded basalt fibres with very low thermal conductivity of 0.7W/mK. The Type 1 Teplo BF 1 is a BBA certified product and can be used in line with NHBC standards to prevent heat escape f..
  • 200mm - Cavity width: 50mm - 75mm
  • Thermal Conductivity of 0.7W/mK
  • Type 1 Teplo BF-1 is BBA approved
  • Design Embedment - between 62.5mm and 75mm in each leaf
  • BF-1 Tie can be used at any height
£ 5.17
Ex Tax:£ 4.31
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: Type-2 BF-2
200mm Ancon Teplo BF2 Cavity Wall Tie is a Masonry General Purpose Type BF 2 composite wall tie manufactured from pultruded basalt fibres with very low thermal conductivity of 0.7W/mK. The Type 2 Teplo BF 2 is a BBA certified product and can be used in line with NHBC standards to prevent heat esc..
  • 200mm - Cavity width: 50mm - 75mm
  • Thermal Conductivity of 0.7W/mK
  • Type 2 Teplo BF-2 is BBA approved
  • Embedment - between 62.5mm and 75mm in each leaf
  • BF-2 Can be used only up to 15meters height
£ 4.94
Ex Tax:£ 4.12
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: Type-4 BF-4
200mm Ancon Teplo BF4 Masonry Wall Tie Light Duty Type 4 is a composite cavity wall tie manufactured from pultruded basalt fibres with thermal conductivity of 0.7W/mK, used in external walls of domestic dwellings up to 10meters in height. The Type 4 Teplo BF 4 is a BBA certified product and can b..
  • 200mm - Cavity width: 50mm - 75mm
  • Thermal Conductivity of 0.7W/mK
  • Type 4 Teplo BF-4 is BBA approved
  • Design Embedment: between 62.5mm and 75mm in each leaf
  • BF-4 Can be used only up to 10m height
£ 3.31
Ex Tax:£ 2.76
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: 200mm HRT4
200mm Ancon Staifix HRT4 Housing Wall Tie is a highly durable type 4 (Masonry Light Duty) cavity wall tie suitable for use in external walls of domestic houses up to 10metres in height.  Ancon HRT4 Wall ties provide a solution for cavities from 50mm to 300mm in residential and small commercial de..
  • 200mm suitable for 50mm to 75mm cavities
  • Highly Durable
  • 250 pieces per pack
  • For Cavity Wall Insulation
  • PIR Cavity Insulation - Rock Wool Slabs (batts)
£ 54.47
Ex Tax:£ 45.39
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: 200mm RT2
200mm Ancon Staifix RT2 Cavity Wall Tie is a superior stainless steel type 2 Masonry General Purpose cavity wall tie designed for domestic and small commercial buildings up to 15 metres in height. RT2 ties are suitable for flat sites where the basic wind speed is up to 31m/s and altitude is not m..
  • 200mm suitable for 50mm to 75mm cavities
  • Stainless Steel - Highly Durable
  • 250 pieces per pack - RT2 - SS
  • For use in External Masonry Walls
  • PIR Cavity Insulation - Rock Wool Slabs (batts)
£ 149.23
Ex Tax:£ 124.36
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: TEPLO-BFR
210mm Ancon Teplo BFR (7mm Diameter Cavity Wall Tie) is an innovative low thermal conductivity premium cavity wall tie manufactured from basalt-fibres designed for new build cavity wall construction where mortar joints do not align e.g. thin-joint blockwork, or in retrofit applications where a new l..
  • Teplo-BFR to suit cavities from 75mm to 450mm!
  • Thermal conductivity of 0.7W/mK
  • BBA Approval and in line with NHBC standards
  • 7mm diameter tie, requiring a 10mm drill bit/hole
  • Design Embedment Resin/Mortar: 70mm/65mm
£ 5.29
Ex Tax:£ 4.41
Estimated delivery: 2-3 working days
Brand: Celotex® Model: 25mm CW4000
25mm Celotex CW4000 Partial Fill Cavity Wall Insulation Board (CW4025) is an easy to install PIR (polyisocyanurate) rigid insulation board, featuring a low emissivity foil facings with excellent thermal conductivity of 0.022 W/mk that is suitable for partial fill masonry cavity wall applications. ..
  • Lightweight - Squared edges
  • Partial Fill Masonry Cavity Walls
  • Low emissivity foil facing
  • Achieves a BRE Green Guide A rating
  • BBA approved – certificate 16/5343
£ 137.88
Ex Tax:£ 114.90
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin XT/CW
25mm Unilin Thin-R XT/CW PIR Cavity Insulation Board is used in traditional masonry walls, built to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. Unilin Cavity Wall (T&G) tongue and groove jointing offers a practical onsite solution..
  • 25mm Unilin Thin-R XT/CW Partial Fill Cavity Wall Insulation Board
  • Reduced the Thermal Bridging and improved the U-Value of the wall
  • Low emissivity foil facing on XT/CW improves the thermal performance
  • Recommended residual cavity width is 50mm (Building Regulations)
  • Most effective method of preventing wind-driven rain penetrating a wall
£ 143.88
Ex Tax:£ 119.90
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 40mm TW50
40mm Kingspan TW50 Thermawall Cavity Wall Insulation Board is a high-efficiency, BBA certified cavity insulation board designed for partial fill masonry cavity walls. Thermawall TW50 is a stable and rot proof cavity wall insulation board used in newbuild and extension projects and will remain eff..
  • Low emissivity foil facings
  • Easy to handle and install
  • Thermal conductivity 0.022 W/m.K
  • BBA Certificate 14/5133
  • Non–deleterious material
£ 128.78
Ex Tax:£ 107.32
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 40mm XT/CW
40mm Xtratherm XT/CW Partial Fill Cavity Wall is a high-quality, BBA certified, tongue and groove PIR insulation board with certified thermal conductivity of 0.022 W/mK designed for use in traditional masonry partial fill cavity walls. Xtratherm Cavity Wall is a highly-durable, rot proof insulati..
  • BBA Certification No. 08/4613
  • Board coverage : 0.54m2
  • Pack coverage: 4.86m2
  • R-Value:  1.8m2K/W
  • Surface spread of flame: Class 1
£ 105.79
Ex Tax:£ 88.16
Estimated delivery: 3-5 working days
Brand: Leviat-Ancon® Model: Type-3 BF-3
450mm Ancon Teplo BF3 Cavity Wall Tie is a Masonry Basic Type BF 3 composite wall tie manufactured from pultruded basalt fibres with thermal conductivity as low as 0.7W/mK. The Type 3 Teplo BF 3 is a BBA certified product and can be used in line with NHBC standards to prevent heat escape from the..
  • 450mm - Cavity width: 301mm - 325mm
  • Thermal Conductivity of 0.7W/mK
  • Type 3 Teplo BF-3 is BBA approved
  • Embedment - between 62.5mm and 75mm in each leaf
  • BF-3 Can be used only up to 15meters height
£ 7.80
Ex Tax:£ 6.50
Estimated delivery: 2-3 working days
Brand: Kingspan® Model: 50mm KKCC Cavity Closer
50mm Kingspan Kooltherm® Cavity Closer (KKCC 50) is a premium performance insulated cavity closer with a fibre-free rigid thermoset phenolic core designed for closing cavities around masonry wall openings in England and Wales only. Kingspan Kooltherm Cavity Closer 50mm is compatible with uPVC, ti..
  • 50mm Kingspan Kooltherm® Cavity Closer (KKCC 50)
  • Premium performance uPVC insulated cavity closer
  • Designed for closing cavities around masonry wall openings
  • Thermal conductivity of 0.022 W/mK - 2400mm lengths
  • Suitable for use in both new build and refurbishment projects
£ 239.88
Ex Tax:£ 199.90
Estimated delivery: 7-10 working days
Brand: Kingspan® Model: 50mm Thermabate®
50mm Kingspan Thermabate® Cavity Closer (3m length) is a uPVC extrusion with a fibre-free rigid thermoset urethane (PUR) insulation core with certified thermal conductivity (lambda value) of 0.034 W/mK. It is used to maintain continuous insulation around window and door openings in masonry cavity..
  • 50mm Kingspan Thermabate® Cavity Closer (3m lengths)
  • Certified thermal conductivity (lambda value) of 0.034 W/mK
  • Maintain continuous insulation around window & door openings
  • Provides a simple and effective method for closing cavities
  • Cavity closer box section comprising a uPVC and PUR insulation
£ 263.88
Ex Tax:£ 219.90
Estimated delivery: 7-10 working days
Brand: Knauf® Model: DriTherm 37 - 50mm
50mm Knauf DriTherm 37 Standard Cavity Insulation Slab is a non-combustible, water-repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.037W/mK for use in masonry full fill cavity wall applications. Dritherm37 Knauf Cavity Slab 50mm is a highly durable, odourles..
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
£ 40.28
Ex Tax:£ 33.57
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 50mm SR/CW Cavity Insulation
50mm SR/CW Partial Fill Cavity Wall Insulation Xtratherm Safe-R is a top-class phenolic foam rigid cavity insulation board with a low emissivity foil facings designed for use in traditional masonry walls. A high-performance BBA certified 1200mm x 450mm x 50mm square edge board with an approved th..
  • Thermal Conductivity: 0.021W/mK
  • For New Build or Refurbishment
  • Reaction to Fire Euroclass D -s1, d0
  • BBA Certification No. 10/4803
  • BRE Green Guide A+ Rated - Building Regulations
£ 117.85
Ex Tax:£ 98.21
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50mm Unilin SR/CW Cavity Walls
50mm Unilin SR/CW is a partial fill cavity wall insulation board used for traditional masonry walls, achieves excellent U-Values whilst maintaining a residual cavity, offering protection from wind driven rain. Unilin Safe-R SR/CW is manufactured to EN 13166 by Unilin Insulation with certified lam..
  • 50mm Unilin SR/CW Phenolic Insulation Board for Partial Fill Cavity Walls
  • Safe-R SR/CW improves U-Values and meets Future Homes standards
  • SR/CW Providing an excellent choice for passive and low energy builds
  • Can achieve a passive U-Value of 0.15 W/m2K in a traditional cavity wall
  • Lambda (thermal conductivity) of 0.020 W/mK and Euroclass D-s1 d0
£ 143.88
Ex Tax:£ 119.90
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50mm Unilin XO/CW Cavity
50mm XO/CW T&G Unilin, comprising a rigid polyisocyanurate (PIR) foam insulation board with a textured aluminium foil-facing on both sides, for use as partial fill insulation. Xtroliner XO/CW improves U-Values and meets Future Homes standards, providing an excellent choice for passive and low ene..
  • 50mm Unilin XO/CW T&G Insulation Board for Partial Fill Cavity Walls
  • Xtroliner XO/CW improves U-Values and meets Future Homes standards
  • XO/CW Providing an excellent choice for passive and low energy builds
  • Can achieve a passive U-Value of 0.15 W/m2K in a traditional cavity wall
  • Lambda (thermal conductivity) of 0.021 W/mK and Euroclass C s2 d0 fire class
£ 119.88
Ex Tax:£ 99.90
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50mm Unilin XT/CWP (T&G)
50mm Unilin XT/CWP Thin-R Plus Partial Fill Cavity is a partial fill cavity system with engineered tongue and grooved joints to ensure insulation continuity and minimisation of thermal bridging. The lower lambda (thermal conductivity) of 0.021 W/mK improves U-Values of the cavity and meets Future..
  • 50mm Unilin Thin-R PLUS XT/CWP Partial Fill Cavity Wall Insulation
  • Reduced the Thermal Bridging and improved the U-Value of the wall
  • Low emissivity foil facing on XT/CWP improves the thermal performance
  • Recommended residual cavity width is 50mm (Building Regulations)
  • Most effective method of preventing wind-driven rain penetrating a wall
£ 107.17
Ex Tax:£ 89.31
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 50mm XT/CWP Cavity PLUS
50mm Xtratherm Thin-R XT/CWP Cavity Wall Plus is a robust tongue and groove jointing PIR (polyisocyanurate) rigid insulation board with a low emissivity foil facings, used for traditional masonry partial fill cavity walls. XT/CWP Cavity Wall Plus (T&G) is the best solution when building tradition..
  • 50mm Xtratherm XT/CWP Cavity Wall Plus Insulation Board
  • Lower Lambda value (thermal conductivity) of 0.021 W/mK
  • Enhanced performance PIR (polyisocyanurate) rigid insulation
  • Easy to install tongue and groove (T&G) jointing system
  • Used as a traditional masonry partial fill cavity wall insulation
£ 117.66
Ex Tax:£ 98.05
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 50mm XO/CW
50mm Xtratherm Xtroliner XO/CW is an improved performance PIR (polyisocyanurate) tongue and groove insulation board with robust foil facings designed for partial fill cavity wall insulation with an approved thermal conductivity (lambda value) as low as 0.021W/mK. This lower lambda improves U-Valu..
  • A + rating under the BRE Green Guide
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire Euroclass C-s1, d0
  • (T&G) tongue and groove jointing
  • BBA Certificate 12/4956 - Building Regulations
£ 132.14
Ex Tax:£ 110.12
Estimated delivery: 5-7 working days
Brand: Novia® Model: 60mm BOPP Tape
60mm Novia Metalised BOPP Tape 50m is a high strength often used adhesive tape used in vapour control and damp proofing applications as a final barrier to improve air tightness. Novia Metallised reflective tape is made form Biaxially Oriented Polypropylene. BOPP tape should be used in conjunct..
  • Incredible strength and reflectivity - Roll 60mm wide
  • Used as an overlap seal to improve air tightness
  • Use in conjunction with Novia Double Sided Butyl tape
  • Must be used when installing Novia Methane Pro barrier
  • Novia Metallised BOPP (Biaxially Oriented Polypropylene)
£ 24.95
Ex Tax:£ 20.79
Estimated delivery: 2-3 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 75mm CavityTherm Unilin
75mm Unilin CavityTherm CT/PIR Insulation Board is a high performance composite board of enhanced PIR with a lambda value of 0.021 W/mK, for full fill cavity wall applications. CavityTherm is proven to provide the most cost effective answer, not only reaching Future Homes Standard fabric U-Values..
  • 75mm CavityTherm Unilin Insulation for full fill cavity wall applications
  • CavityTherm is an innovative built-in insulation for traditional walls
  • CavityTherm achieves passive level U-Values as low as 0.12 W/m2K
  • Made of an enhanced PIR core with thermal conductivity of 0.021W/mK
  • CavityTherm Unilin is a continuous insulation system for full fill cavities
£ 103.34
Ex Tax:£ 86.12
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 75mm CT/PIR
75mm Xtratherm CT/PIR CavityTherm Thin-R is a cost effective rigid polyisocyanurate thermal insulation board used for traditional full fill cavity walls to provide excellent U-Values and meet the Passive House standards. Xtratherm CT/PIR Cavity Wall insulation is a top-class composite board of en..
  • BBA Certification No. 10/4786.
  • Board coverage : 0.54m2
  • Pack coverage: 2.16m2
  • R-Value:  3.57m2K/W
  • Thermal Conductivity: 0.021 W/mk
£ 108.90
Ex Tax:£ 90.75
Estimated delivery: 5-7 working days
Brand: Knauf® Model: DriTherm 32 - 75mm
75mm Knauf Earthwool DriTherm 32 Ultimate Cavity Insulation Slab is a water-repellent glass mineral wool cavity insulation slab with a certified thermal conductivity of 0.032W/mK, used in external masonry full-fill cavity walls. Knauf Dritherm 32 Cavity Slab 75mm is a highly durable, odourless, r..
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
£ 47.86
Ex Tax:£ 39.88
Estimated delivery: 3-5 working days
Brand: Knauf® Model: DriTherm 34 - 75mm
75mm Knauf Earthwool DriTherm Super Cavity Slab 34 is a water repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.034W/mK for use in masonry full fill cavity wall applications. Dritherm 34 Cavity Insulation Slab 75mm is a highly durable, odourless, rot proof, n..
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
£ 43.92
Ex Tax:£ 36.60
Estimated delivery: 5-7 working days
Brand: Recticel® Model: 75mm Cavity
75mm Recticel Eurowall PLUS PIR Cavity Insulation Board is a high-performance polyisocyanurate rigid foam insulation board faced with a gas diffusion tight multilayer foil on both sides suitable for full fill cavity wall applications with a minimum residual cavity of 10mm, up to 25m in height. Eu..
  • Size: 1190mm x 450mm
  • Board coverage: 0.54m2
  • Thermal Conductivity: 0.022 W/mk
  • Tongue and Groove
  • BBA Certificate 02/3908
£ 19.88
Ex Tax:£ 16.57
Estimated delivery: 7-10 working days
Brand: Superglass® Model: Superwall 32 - 75mm
75mm Superglass Superwall 32 Cavity Wall Insulation Batt is a high performance, non-combustible, BBA approved and water repellent glass mineral wool insulation slab used in masonry full or partial fill cavity wall applications. Superglass Superwall 32 Cavity Wall Insulation Batts 75mm are highly ..
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
£ 77.33
Ex Tax:£ 64.44
Estimated delivery: 3-5 working days
Brand: Superglass® Model: Superwall 36 - 75mm
75mm Superglass Superwall 36 Cavity Batt is a standard performance water repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.036W/mK for use in masonry full fill or partial fill cavity wall applications. Superglass Superwall 36 Cavity Wall Insulation Batts are ..
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
£ 60.02
Ex Tax:£ 50.02
Estimated delivery: 3-5 working days
Brand: URSA® Model: 75mm URSA TERRA 32
75mm URSA 32 Cavity Wall Insulation Batt is a non-combustible class A1 fire rated, semi rigid glass mineral wool slab treated with silicone water-repellent additive designed for use as either a full or partial fill masonry cavity wall insulation for buildings up to 25meters in height. URSA 32 Cav..
  • Non-combustible Class A1 Cavity Batt
  • Full or Partial Fill Masonry Cavity Walls
  • Semi rigid glass mineral wool cavity slab
  • Certified thermal conductivity of 0.032W/mK
  • BBA Certificate 09/4624 ǀ Density of 32 kg/m3
£ 76.22
Ex Tax:£ 63.52
Estimated delivery: 3-5 working days
Brand: URSA® Model: 75mm URSA TERRA 35
75mm URSA 35 Cavity Wall Batt is a non-combustible, A1 fire rated, semi rigid glass mineral wool cavity insulation slab with certified thermal conductivity of 0.035W/mK and density of 22kg/m3, used in full fill or partial fill external masonry cavity walls. URSA 35 Cavity Wall Insulation Batt 75m..
  • Non-combustible Class A1 Cavity Batt
  • Full or Partial Fill Masonry Cavity Walls
  • Semi rigid glass mineral wool cavity slab
  • Certified thermal conductivity of 0.035W/mK
  • BBA Certificate 09/4624 ǀ Density of 22 kg/m3
£ 67.50
Ex Tax:£ 56.25
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 80mm K106
80mm Kingspan Kooltherm K106 Cavity Insulation Board is an advanced full-fill cavity wall insulation board with an excellent thermal conductivity of 0.019 W/mK that achieves the same wall U-value as alternative products with a much thinner profile. K106 Cavity Board 80mm x 450mm x 1200mm is speci..
  • 80mm Kingspan Kooltherm K106 Cavity Board
  • Advanced full-fill cavity wall insulation board
  • Excellent thermal conductivity of 0.019 W/mK
  • Premium performance rigid thermoset fibre-free phenolic insulation
  • Water-tight polypropylene fleece and low emissivity composite foil
£ 119.88
Ex Tax:£ 99.90
Estimated delivery: 5-7 working days
Brand: Leviat-Ancon® Model: Teplo-Clip 1000
Ancon Teplo Clip for Teplo L and Teplo BF Ties is a specific clip to retain insulation in place in external cavity wall insulation system used with Ancon Teplo-L and Ancon Teplo-BF-wall-ties for cavity widths from 50mm up to 500mm. The Teplo-L-Tie is ideal where a low thermal conductivity restrai..
  • Highly Durable
  • Cavity widths: 50-500mm
  • Clip to retain insulation in place
  • External cavity wall insulation systems
  • Can be used with Ancon Teplo L and Ancon Teplo BF ties
£ 89.88
Ex Tax:£ 74.90
Estimated delivery: 2-3 working days
Brand: Kingspan® Model: 40mm Kooltherm® K108
The 40mm Kingspan Kooltherm K108 is a partial fill cavity wall insulation board, an advanced phenolic fibre-free rigid thermoset insulation core with certified thermal conductivity of 0.019 W/mK. K108 Phenolic Cavity Board 40mm x 450mm x 1200mm is a one of the thinnest commonly used insulation fo..
  • Kingspan Kooltherm K108 Partial Fill Cavity Insulation Board 40mm
  • Premium performance lower lambda (0.019 W/mK) cavity insulation
  • Significantly increases the thermal resistance of the cavity walls
  • Kooltherm® Kingspan K108 Phenolic Cavity Board 450mm x 1200mm
  • Achieves the same U-value as an alternative products with a thinner board
£ 191.88
Ex Tax:£ 159.90
Estimated delivery: 5-7 working days
Brand: Novia® Model: A1F 25m2
NOVIA A1F Standard Building Paper 25m2 is a regular, reinforced kraft bitumen-bonded building product manufactured with wet strength kraft paper, used as a temporary protection or underlay on uninsulated cladding. Meets the technical requirements of BS 1521 for waterproof building papers. The..
  • Air movement barriers
  • Underlays on uninsulated cladding
  • Temporary protection, Vapour checks
  • Separation layers, Bond breaks
  • Draught and damp exclusion
£ 81.82
Ex Tax:£ 68.18
Estimated delivery: 2-3 working days
Brand: Novia® Model: B1F 62.5m2
B1F Building Paper Novia 1.25m x 50m (62.5m2 roll) is a standard reinforced kraft paper bitumen-bonded building laminate used within the construction industry. Novia meets the requirements of BS 1521, grade B1F (Class B with reinforcement).  B1F can be used in separation layers for insulated s..
  • Separation layers for insulated screeds
  • Temporary protection, Garden buildings
  • Made to BS 1521 Class B
  • Multi-use adaptable building product
  • Bitumen, paper and reinforcement scrim laminate
£ 104.04
Ex Tax:£ 86.70
Estimated delivery: 2-3 working days
Brand: Novia® Model: VC2 AVCL 75m2
Novia VC2 is an innovative, flame resistant, scrim reinforced and airtight vapour check membrane for use in insulated walls, floors and roofs. Air Leakage and Vapour Control Layer is a extra tough material providing good tensile and nail tear strength. It is lightweight and easy to handle and ..
  • Air-leak barrier and vapour control layer (AVCL)
  • CE approved and CPR compliant
  • Complies with BS EN 13984
  • Flame resistant to EN 13501-1, class E
  • Helps buildings meet the requirements of BS 5250
£ 176.12
Ex Tax:£ 146.77
Estimated delivery: 2-3 working days
Brand: Leviat-Ancon® Model: clips 250
Staifix Universal Insulation Retaining Clips for Cavities are suitable for retaining insulation to the inner leaf of the masonry cavity walls. Retaining Clips from Ancon can be used with most stainless steel ties in partial fill cavity insulation. Ancon Clip is a highly durable product which c..
  • Highly Durable
  • 80mm Diameter
  • 250 pieces per pack
  • Partial Fill Cavity Wall Insulation
  • PIR Cavity Insulation - Rock Wool Slabs (batts)
£ 23.88
Ex Tax:£ 19.90
Estimated delivery: 2-3 working days
Brand: Tenmat Model: Tenmat FF102/25 for 25mm Cavities
4mm Tenmat FF102/25 Fire Barrier is a high expansion intumescent seal used as a fire protection barrier designed to reinstate fire resistance performance within external wall cavities that require permanent ventilation. In the event of a fire the FF102/25 Tenmat will expand to close the external ..
  • Tenmat FF102/25 Ventilated Cavity Fire Barrier for 25mm cavities
  • Provided in strips of 1000mm long by 35mm wide and 4mm thick
  • Fire Rated for up to 60 minutes for both integrity and insulation
  • High expansion intumescent seal used as a fire protection barrier
  • Lightweight - designed to be easily and quickly installed on site
£ 23.88
Ex Tax:£ 19.90
Estimated delivery: 2-3 working days
Brand: Knauf® Model: DriTherm 34 - 100mm
100mm Knauf Earthwool DriTherm Cavity Slab 34 is a rigid glass mineral wool insulation slab with a certified thermal conductivity of 0.034W/mK for use in external masonry full fill cavity walls. DriTherm 34 Cavity Slab 100mm is an easy to install odourless, rot proof, non-hygroscopic insulation s..
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
£ 56.28
Ex Tax:£ 46.90
Estimated delivery: 5-7 working days