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Wall Insulation

The benefits of properly sealed, moisture-protected, and insulated walls are:

  • increased comfort
  • reduced noise
  • reduced energy cost
  • reduced CO2 emissions
Wall Insulation requirements

In order to achieve most effective results when installing wall insulation a number of key factors must be taken into consideration:

  • Airtight construction—all air leaks should be sealed in the wall during construction and prior to insulation installation.
  • Moisture control—exterior rain drainage system, continuous air barrier, and vapour barrier should be located on the appropriate side of the wall
  • Complete insulation coverage—advanced framing should be used to maximize insulation coverage and reduce thermal bridging, no gaps or compressed insulation, and continuous insulated sheathing.
Air sealing

Air sealing reduces heat flow from air movement (convection) and prevents water vapour in the air from entering the wall. In a 100-squarefoot wall, one cup of water can diffuse through drywall without a vapour barrier in a year, but 50 cups can enter through a ½-inch, round hole. In fact, sealing air leaks is 10 to 100 times as important as installing a vapour barrier. Air sealing and moisture control make insulation more effective. Vapour barriers only retard moisture due to diffusion, while most moisture enters walls either through fluid capillary action or as water vapour through air leaks.

Causes of rain leaks through exterior walls include improper installation of siding materials; poor-quality flashing, weather-stripping, or caulking around joints in the building exterior (such as windows, doors, and bottom plates); and wind-driven rain that penetrates the exterior finish. To enhance protection against rain penetration, a drainage plane should be created within the wall system of the home.

U-value

The effectiveness of an insulating material is measured using a 'U-value'. A U-value is a measure of how much heat is conducted through a structure. Correctly installed insulation will have a low U-value as it will allow only small amounts of heat to pass through, thereby keeping your home warmer for longer.

Building regulations require insulated walls to achieve U-value of 0.27 W/m K or better (i.e. Lower).

Wall and Insulation Types

The first step in getting wall insulation is establishing the wall type of your home. The three main wall types are:

  • cavity walls
  • solid walls
  • hollow block walls
A building contractor or architect will be able to tell you what type of wall your home has. Depending on the wall specification three types of wall insulation can be used:
  • Cavity wall insulation
  • Internal Insulation
  • External insulation
Wall Insulation Application Types

    Full fill cavity

    Used in cavity walls.

    • No need for a residual cavity.
    • Suitable for mineral wool and some expanded polystyrene insulants.
    • Insulation thickness varies according to the U-value requirement.
    • Wall tie or suitable fixing is essential.
    • Foil faced insulants are not suitable for this application.
    • Suitable for natural insulation materials when used with a barrier

    Partial fill cavity

    Used where residual cavity is needed to avoid risk of rain penetration.

    • Residual cavity must be a minimum of 50mm.
    • Suitable for all insulants.
    • Thinner, foil faced insulation boards take advantage of reduction in heat radiance across the cavity and reach required U-value.
    • Any problems associated with complete cavity fill can be avoided.
    • Suitable for natural insulation materials when used with a barrier

    Internal Wall Insulation (Thermal Laminates)

    Used in homes built with solid wall or hollow block construction method.

    • Combination of insulation already bonded to plasterboard.
    • Simple to fit - just fix against internal leaf of wall.
    • Wide range of insulation materials available to meet every need.
    • Suitable for refurbishment
    External Wall Insulation
    Used in solid walls that suffer from poor airtightness.
    • Ideally suited to refurbishment products.
    • Wide range of products offered for this application.
    • Suitable for natural insulation materials when used with a barrier

    CHOOSE MANUFACTURERS or scroll down to see products

    Brand: British Gypsum Model and Size: 1200x2400mm - 2.88m2
    Delivery Time: 1 - 2 days
    12.5mm Gyproc SoundBloc consists of an aerated gypsum core with glass fibre, water repellent and other additives encased in, and firmly bonded to strong paper liners--blue face paper, brown reverse side paper. This board is specially designed for use in heavy use areas where greater levels of sound ..
    £19.68
    £23.62 inc VAT
    12.5mm Gyproc Wallboard Duplex 600x1800mm
    Guide Price
    Brand: British Gypsum Model and Size: 1800x900mm - 1.62m2
    Delivery Time: 3 - 5 days
    12.5mm Gyproc WallBoard Duplex is used for wall and ceiling linings where vapour control and plasterboard lining are required in one fixing operation. Gyproc WallBoard duplex consists of an aerated gypsum core encased in, and firmly bonded to, strong paper liners and backed with an additional metali..
    12.5mm Siniat GTEC Weather Defence External Sheathing Board
    Guide Price
    Brand: Siniat Model and Size: 2400x1200 - 2.88m2
    Delivery Time: 2 - 4 days
    12.5mm Siniat GTEC Weather Defence External Sheathing Board is a strong, highly moisture resistant and non combustible external sheathing board, faced with water repellent material for superior weather protection.  Thermal insulation can be installed within the frame, mechanically and/or a..
    Guide Price: £46.02
    £55.22 inc VAT
    15mm Gyproc SoundBloc F High Density Acoustic Board 1200x2400mm
    Guide Price
    Brand: British Gypsum Model and Size: 1200x2400mm - 2.88m2
    Delivery Time: 1 - 2 days
    15mm Gyproc SoundBloc F consists of an aerated gypsum core with glass fibre, water repellent and other additives encased in, and firmly bonded to strong paper liners. This board is specially designed for use in heavy use areas where greater levels of sound insulation and increased fire protection ar..
    Guide Price: £20.72
    £24.86 inc VAT
    18mm JCW Cement Particle Board for Ceilings and Floors
    Guide Price
    Brand: JCW Model and Size: 1200x600mm - 0.72m2
    Delivery Time: 2 - 3 working days
    18mm JCW Acoustic Cement Particle Board is a high density T&G overlay acoustic board suitable for floors and ceilings, specially designed to add concentrated mass. Used where there is a requirement for a high performance result in acoustic control and fire retardance. Manufactured from Port..
    Guide Price: £30.13
    £36.16 inc VAT
    20mm JCW Absorber Ceiling Tile - pack of 10
    Guide Price
    Brand: JCW Model and Size: 1200x600mm - 7.20m2
    Delivery Time: 3 - 5 days
    JCW Absorber Ceiling Tile is a glass mineral fibre acoustic core board with white speckled surface finish and bevelled edges that can be direct bonded to existing ceiling.CHARACTERISTICSLightweight for ceiling, quick and simple installation, Low (20mm) material thickness which saves headroom space, ..
    Guide Price: £331.86
    £398.23 inc VAT
    20mm JCW RR20 Multi-Purpose Mat - Soundproof Matting
    Guide Price
    Brand: JCW Model and Size: 1000x1000mm - 1.00m2
    Delivery Time: 2 - 3 working days
    20mm JCW RR20 Multi-Purpose Mat is a high performance, cost effective polyurethane bound rubber granulate material, which will retain its acoustic properties throughout a long and maintenance free lifespan. It can be used successfully for a multitude of sound absorbing and impact dampening requireme..
    Guide Price: £35.72
    £42.86 inc VAT
    25mm Polyfoam XPS Floorboard - Extra grade - Extruded Polystyrene Board (pack of 18)
    Guide Price
    Brand: Polyfoam XPS Model and Size: 2500x600mm - 27m2
    Delivery Time: 5 - 7 days
    25mm Polyfoam XPS Floorboard - Extra grade is a high strength (kPA 300) extruded polystyrene board (XPS) suitable for any floor construction including below a concrete slab, below a screed and below chipboard. It can also be used as the external insulation layer in basement walls dept..
    25mm Polyfoam XPS Floorboard - Standard grade - Extruded Polystyrene Board (pack of 18)
    Guide Price
    Brand: Polyfoam XPS Model and Size: 2500x600mm - 27m2
    Delivery Time: 5 - 7 days
    25mm Polyfoam XPS Floorboard - Standard grade is a high strength extruded polystyrene board (XPS) suitable for any floor construction including below a concrete slab, below a screed and below chipboard. It can also be used as the external insulation layer in basement walls depth up to 2.50m.CHARACTE..
    Guide Price: £248.05
    £297.66 inc VAT
    27.5mm JCW Acoustic Silent Board - Acoustic Wall Liner
    Guide Price
    Brand: JCW Model and Size: 1200x1200mm - 1.44m2
    Delivery Time: 2 - 3 working days
    27.5mm JCW Silent Board is an acoustic wall liner manufactured by laminating a 15mm acoustic resilient layer to a 12.5mm layer of acoustic grade plasterboard to drastically reduce sound transmission. It can be applied to either masonry or stud walls and is also suitable to reduce flan..
    Guide Price: £62.69
    £75.23 inc VAT
    50mm Polyfoam XPS Floorboard - Super grade - Extruded Polystyrene Board (pack of 8)
    Guide Price
    Brand: Polyfoam XPS Model and Size: 1250x600mm - 6m2
    Delivery Time: 5 - 7 days
    50mm Polyfoam XPS Floorboard - Super grade is a high strength (kPA 500) extruded polystyrene board (XPS) suitable for any floor construction especially high load applications such as car park floors and cold store floors. It is a lap jointed board.CHARACTERISTICSExcellent thermal cond..
    Brand: Rockwool Model and Size: 1200x600mm - 0.72m2
    Delivery Time: 1 - 2 days
    50mm Rockwool Ablative Coated Batt is intended to act as an airseal barrier to reinstate the fire resistance and acousticperformances of concrete floors, masonry walls and dry wall systems when voids have been created for the passage of services. This includes pipes made of plain or stainless steel,..
    £16.08
    £19.30 inc VAT
    Brand: Thermafleece Model and Size: 1200x390mm - 19.66m2- Free delivery
    Delivery Time: 2 - 5 working days
    Thermafleece CosyWool Flexible Slab is a versatile low density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly envir..
    £184.90
    £221.88 inc VAT
    50mm ThermaFleece NatraHemp Flexible Slab 370mm x 1200mm (pack of 48)
    Guide Price
    Brand: Thermafleece Model and Size: 1200x370mm - 21.31m2
    Delivery Time: 2 - 3 working days
    Thermafleece NatraHemp Flexible Slab is a medium density insulation rich in home-grown hemp fibres and is a safe, efficient and durable alternative when plant fibre is the preferred choice. Hemp is a fast-growing, low-impact plant crop that produces fine fibres suitable for insulation. Hemp fibres a..
    Guide Price: £191.08
    £229.30 inc VAT
    Brand: Thermafleece Model and Size: 1200x390mm - 14.04m2 - Free Delivery
    Delivery Time: 2 - 3 working days
    Thermafleece UltraWool Flexible Slab is a versatile high density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly environm..
    £174.32
    £209.18 inc VAT
    52mm JCW Acoustic Quilt - 600mm wide
    Guide Price
    Brand: JCW Model and Size: 5000x600mm - 3.00m2
    Delivery Time: 2 - 3 working days
    52mm JCW Acoustic Quilt is a premium partition insulation roll for walls manufactured by sandwiching a 2mm acoustic barrier membrane between 2 layers of 25mm mineral wool. The sound barrier properties of the acoustic membrane are complemented and enhanced by the absorption qualities of the..
    Guide Price: £64.22
    £77.06 inc VAT
    Brand: JCW Model and Size: 5mm x 150mm - Free Delivery
    Delivery Time: 2 - 3 working days
    5mm JCW Perimeter Edging Strip is a foam strip to isolate acoustic flooring from perimeter walls and maintain the acoustic integrity of the structure. For use with Acoustic Battens, Acoustic Cradles and Acoustic Decks.APPLICATIONTo isolate acoustic flooring from perimeter walls CERTIF..
    £48.73
    £58.48 inc VAT
    JCW Perimeter Edging L-Strip - 2m - Flanking Band
    Guide Price
    Brand: JCW Model and Size: 53x23x2000mm
    Delivery Time: 2 - 3 working days
    JCW Perimeter Edging L-Strip is a 2m pre-formed foam angle strip to isolate acoustic flooring from perimeter walls and maintain the acoustic integrity of the structure.APPLICATIONTo isolate acoustic flooring from perimeter walls CERTIFICATIONIt has been independently tested in a UKAS accre..
    Guide Price: £1.14
    £1.37 inc VAT
    60mm Rockwool Frontrock  MAX E  Dual Density External Wall Insulation Slab 1000x600mm (pack of 4)
    Guide Price
    Brand: Rockwool Model and Size: 1000x600mm - 2.40m2
    Delivery Time: 3 - 5 weeks
    60mm Rockwool Frontrock MAX E is a rigid dual density thermal and acoustic insulation slab made from volcanic rock, thus extremely durable, fire resistant and specifically created for external wall applications to go directly under render. The higher density surface of the slab is to take the r..
    80mm Kingspan Kooltherm K106 Phenolic Cavity Board (pack of 6)
    Guide Price
    Brand: Kingspan Model and Size: 1200x450mm - 3.24m2
    Delivery Time: Pre-Order
    80mm Kingspan Kooltherm K106 Cavity Board is a premium performance rigid thermoset fibre-free phenolic insulation core bonded to a water-tight, vapour-open polypropylene fleece and to a inner facing of a low emissivity composite foil. It is specifically designed to limit thermal bridging a..
    9mm Cembrit PB Permabase Cement Board - Base Board for External Render 9mm Cembrit PB Permabase Cement Board - Base Board for External Render
    Guide Price
    Brand: Cembrit Model and Size: 2400x1200 - 2.88m2
    Delivery Time: 1 - 2 days
    9mm Cembrit Permabase is a rigid cement and aggregate board incorporating polystyrene beads. The board's flat surface is strengthened with glass mesh. Its reinforced tapered edges designed to facilitate invisible butt joint installation. Cembrit PB cement board is lightweight, water resistant, so is..
    JCW Acoustic Screed Foam Pack - Concrete Floor Under Screed Resilient Layer
    Guide Price
    Brand: JCW Model and Size: JCW ASFP - 62.40m2
    Delivery Time: 2 - 3 working days
    JCW Acoustic Screed Foam Pack is a complete concrete floor under screed resilient layer pack containing JCW Acoustic Screed Foam, JCW Acoustic Flanking Strip and JCW Acoustic Flanking Strip. This is a big value acoustic foam pack which reduces impact and airborne noise on concrete floors.  ..
    Guide Price: £230.45
    £276.54 inc VAT
    75mm Rockwool SP60 Firestop Cavity Slab (pack of 4)
    Guide Price
    Brand: Rockwool Model and Size: 1000x650mm - 2.60m2
    Delivery Time: 2 - 3 working days
    75mm Rockwool SP60 Firestop Cavity Slab systems form cavity fire stops within commercial and industrial buildings. The solution may be installed horizontally or vertically and is suitable for varying cavity widths in masonry and curtain wall constructions. The product has been designed as a one-piec..
    Guide Price: £190.42
    £228.50 inc VAT
    100mm Isoroc Isofas Mineral Wool Insulation Slab - 1000mm x 600mm (pack of 3)
    Guide Price
    Brand: Isoroc Model and Size: 1000mm x 600mm - 1.8m2
    Delivery Time: 1 - 2 days
    100mm Isoroc Isofas Mineral Wool Insulation Slab is a reliable and durable non-flammable insulation solution for universal use. These slabs can be used in external and internal wall insulation as thermal, acoustic and fire insulation. They can be used as a barrier for fire protection...
    100mm Rockwool Frontrock Plus Dual Density External Wall Insulation Slab 1000mm x 600mm (pack of 3)
    Guide Price
    Brand: Rockwool Model and Size: 1000x600mm - 1.80m2
    Delivery Time: 1-3 working days
    100mm Rockwool Frontrock Plus is a rigid dual density thermal and acoustic insulation slab made from volcanic rock, thus extremely durable, fire resistant and specifically created for external wall applications to go directly under render. Using Frontrock Plus you can be sure that the facade wi..
    Guide Price: £37.98
    £45.58 inc VAT
    100mm Rockwool Frontrock Super Dual Density External Wall Insulation Slab 1000mm x 600mm (pack of 3)
    Guide Price
    Brand: Rockwool Model and Size: 1000x600mm - 1.80m2
    Delivery Time: 5 - 7 days
    100mm Rockwool Frontrock Super is a rigid dual density thermal and acoustic insulation slab made from volcanic rock, thus extremely durable, fire resistant and specifically created for external wall applications to go directly under render. Using Frontrock Super you can be sure that the facade ..
    10mm Cempanel Cembrit Cement Particle Board - pallet of 42
    Guide Price
    Brand: Cembrit Model and Size: 2400x1200mm - 120.96m2
    Delivery Time: 2 - 4 days
    10mm Cempanel is produced by mixing fine wood particle, Portland cement and mineralising agents. The fresh boards are kept in the maturing store and passed through the conditioning chamber to bring them to equilibrium moisture content. Cempanel is one of the most durable building boards and com..
    Guide Price: £1,150.10
    £1,380.12 inc VAT
    10mm Knauf Thermoboard  - Special Performance Plasterboard 1250mm x 2000mm
    Guide Price
    Brand: Knauf Model and Size: 1250x2000mm - 2.50m2
    Delivery Time: 1 - 2 days
    10mm Knauf Thermoboard is a high performance plasterboard designed for use in chilled ceiling applications, and with wall and ceiling heating applications.  The low thermal resistance of the board allows for improvements of up to 20% in the operating efficiency of cooling and heating syste..
    12.5mm British Gypsum Glasroc X Sheathing Board - 1200mm x 2400mm
    Guide Price
    Brand: British Gypsum Model and Size: 1200x2400 - 2.88m2
    Delivery Time: 1 - 2 days
    12.5mm Glasroc X Sheathing Board is a high performance sheathing board that gives BBA certified 6 months weather protection. These boards are used to provide temporary weather protection for structural frame steel constructions, where the facade cladding system is fixed through it into the stee..
    Guide Price: £35.56
    £42.67 inc VAT
    Brand: Fermacell Model and Size: 1200x2400mm - 115.2m2
    Delivery Time: 1 - 2 days
    12.5mm Fermacell is a high performance multi-purpose building board that  combines the properties of solid blockwork with the speed and flexibility of conventional drywall techniques. The unique nature of the 12.5 mm Fermacell board offers a drylining solution that combines high levels of ..
    £880.00
    £1,056.00 inc VAT
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