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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 (show)

    Brand: Celotex Model and Size: 1200mm x 450mm - 7.56m2
    Delivery Time: 1 - 5 working days
    40mm Celotex CW4000 is an insulation board aimed specifically at partial fill cavity wall applications. It comprises a polyisocyanurate rigid foam insulation core, with a thermal conductivity of 0.022 W/mK and low emissivity aluminium foil facings on both sides. CW4000 is manufactured from rigid pol..
    Guide Price: £53.97
    £64.76 inc VAT
    Brand: Celotex Model and Size: 1200x2400mm - 2.88m2
    Delivery Time: 1-3 working days
    Celotex TB4020 is targeted at cut-to-fit applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. TB4012 is also appropriate for use in floors and walls. With low emissivity foil facings, TB4012 is manufac..
    Guide Price: £28.41
    £34.09 inc VAT
    Brand: Xtratherm Model and Size: 1200x2400 (2.88m2)
    Delivery Time: 1-3 working days
    27.5mm Xtratherm Thin-R Thermal Liner XT/TL-MF is a composite insulated panel of 15mm Xtratherm Polyiso (PIR) core with foil faces bonded to 12.5mm tapered edge plasterboard for mechanically fixing to internal walls. XT/TL-MF is designed to provide high levels of thermal insulation and dry lining in..
    Guide Price: £50.48
    £60.58 inc VAT
    Brand: Unilin Insulation (formerly known as Xtratherm) Model and Size: 1200x2400 - 2.88m2
    Delivery Time: 1-3 working days
    37.5mm Unilin Thin-R Thermal Liner XT/TL-MF is a composite insulated panel of 25mm Unilin PIR core with foil faces bonded to 12.5mm tapered edge plasterboard for mechanically fixing to internal walls. Unilin XT/TL-MF is designed to provide high levels of thermal insulation and dry lining i..
    Guide Price: £49.93
    £59.92 inc VAT
    Brand: Xtratherm Model and Size: 1200x2400 (2.88m2)
    Delivery Time: 1-3 working days
    24.5mm Xtratherm Thin-R Thermal Liner XT/TL-MF, this innovative composite insulated panel combines a 15mm Xtratherm Polyiso (PIR) core with foil faces, bonded to 9.5mm tapered edge plasterboard for secure mechanical fixing to internal walls. Ideal for use in new build and refurbishment projects, XT/..
    Guide Price: £50.48
    £60.58 inc VAT
    50mm Celotex CG5000 Partial Fill Cavity Wall Board - pack of 11 - pallet of 16 packs
    Guide Price
    Brand: Celotex Model and Size: 450x1200mm - 95.04m2
    Delivery Time: 3 - 5 days
    Celotex CG5050 is especially designed for partial fill cavity wall insulation, offering great thermal performance due to substantial R and U values, with decreased board thickness and lower emissivity values due to the aluminum foil facings on both sides of the PIR core. This set of products pr..
    Brand: Celotex Model and Size: 1200x2400mm - 46.08m2
    Delivery Time: Out Of Stock
    Celotex FR5025 is one of the available dimensions of the Celotex FR5000 PIR insulation boards made from polyisocyanurate rigid core and faced on both side with low emissivity aluminum foils for improved thermal performance. The product is applicable to different types of constructions incl..
    Brand: Celotex Model and Size: 1200x2400mm - 74.88m2
    Delivery Time: 1 - 5 working days
    Celotex GD5025 is a premium performance PIR insulation bonded to 12.5mm tapered edge plasterboard. Allows for the installation of both the insulation and plasterboard in one operation, thereby reducing installation time. Simplifies compliance to current building regulations for the upgrade of intern..
    25mm Celotex GS5025 PIR Insulation Board with 9.5mm Plasterboard (pack of 26)
    Guide Price
    Brand: Celotex Model and Size: Celotex GS5025 - 74.88m2
    Delivery Time: 1 - 5 working days
    Celotex GS5025 is a premium performance PIR insulation board faced with low emissivity aluminum foils on both sides and bonded to 9.5 mm tapered edge plasterboard, providing an insulation product and a plasterboard in one. The product is designed for mechanically fixed applicatio..
    Guide Price: £1,890.90
    £2,269.08 inc VAT
    Brand: Kingspan Model and Size: TW55 - 1200x2400
    Delivery Time: 1 - 5 working days
    20mm Kingspan Thermawall TW55 is a stud wall PIR insulation board comprising a high performance rigid thermoset insulation core faced on both sides with a low emissivity composite foil facing. APPLICATIONInsulated sheathing on timber frameInsulated sheathing on steel frameInsulation betwee..
    £42.08
    £50.50 inc VAT
    Brand: Kingspan Model and Size: K5 1200x600 - 18 m2
    Delivery Time: Out Of Stock
    20mm Kingspan Kooltherm K5 External Wall Insulation Board is the external wall insulation comprising a premium performance rigid thermoset phenolic insulation core faced on both sides with a glass tissue based facing auto-adhesively bonded to the insulation core during manufacture. The pro..
    Ceresit CT174 Silicate-Silicone Render 1.5mm grain
    sale!
    Brand: Ceresit Model and Size: CT174 - 25kg
    Delivery Time: 5 - 7 days
    1.5mm grain Ceresit CT174 Silicate-Silicone Render is a decorative thin-layer render for indoor and outdoor applications. Ceresit CT 174 combines good points of silicate render and silicone render. It is vapour permeable, of low absorbability and dirt resistant. It is used for making thin-layer rend..
    £58.00 (£69.60 inc VAT)
    £55.10
    £66.12 inc VAT
    Brand: Siniat Model and Size: 2400x1200mm - 2.88.m2
    Delivery Time: 2 - 4 days
    Siniat BluClad is a medium density fibre reinforced calcium silicate board which has been formulated without inorganic fibre. Available in a standard 10mm thickness, it is off-white in colour and has a smooth surface on the front face and textured on the reverse. The smooth face is for painting and ..
    Guide Price: £85.21
    £102.25 inc VAT
    Brand: Siniat Model and Size: 3000mm x 600mm - 1.8.m2
    Delivery Time: 2 - 3 working days
    19mm Siniat GTEC Fire Core Board is a medium density fibre reinforced calcium silicate board which has been formulated without inorganic fibre. Siniat GTEC Fire Core Board is used in Siniat Shaftwall systems, steelwork and fire encasement and has 120min fire resistance. The GTEC Fire Core Board..
    Brand: Kingspan Model and Size: TW50 - 1200x450 - 10.8m2
    Delivery Time: 1 - 5 working days
    25mm Kingspan Thermapitch TW50 comprises of a high performance rigid thermoset insulation core faced on both sides with a low emissivity composite foil facing. CHARACTERISTICSHigh performance rigid thermoset insulation thermal conductivity 0.022 W/m.KClear cavity is maintained resists..
    Guide Price: £133.77
    £160.52 inc VAT
    Brand: Xtratherm Model and Size: 2400mm x 1200mm - 2.88m2
    Delivery Time: 1-3 working days
    15mm Xtratherm Thin-r is a foil faced Polyisocyanurate (PIR) insulation board formed by a blowing process which generates rigid foam composed of fine cells filled with Pentane blowing agent trapped within the foam. Pentane has very good insulating properties and gives Thin-r superb insulating capabi..
    Guide Price: £22.10
    £26.52 inc VAT
    Brand: Jablite Model and Size: 2400x1200 (34.56m2)
    Delivery Time: 2 - 3 working days
    25mm Jablite EPS is a lightweight cellular plastic material suitable for a wide range of building insulation applications. It is an excellent insulating medium which exhibits consistent thermal performance over the range of temperatures normally encountered in buildings. The material is versatile, l..
    Guide Price: £86.98
    £104.38 inc VAT
    Brand: Kay-Metzeler Model and Size: 2400x1200mm - 34.56m2
    Delivery Time: 2 - 3 working days
    25mm EPS70 Kay-Metzeler boards are manufactured by cutting expanded foam blocks. These boards are placed above a concrete slab or a precast concrete floor in domestic ground-floor constructions and finished with a wearing layer of chipboard to meet the Building Regulations' U-value requirements. Kay..
    Guide Price: £86.98
    £104.38 inc VAT
    Brand: Knauf Model and Size: 1200x600 - 14.4m2
    Delivery Time: 2 - 3 working days
    25mm Rocksilk RS45 Universal Slabs are rock mineral wool slabs designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory-applied foil or tissue facing and are available with a ..
    Guide Price: £41.63
    £49.96 inc VAT
    Brand: URSA Model and Size: 1.2x20m - 24.00m2
    Delivery Time: 1 - 2 days
    25mm URSA Acoustic Roll is a lightweight, non-combustible, unfaced glass mineral wool product used for sound insulation of lightweight metal or wooden stud partitions in both new and existing buildings. This product is manufactured from sand, an abundant, sustainable resource and may also utilise up..
    Guide Price: £44.33
    £53.20 inc VAT
    Brand: URSA Model and Size: 2x0.455m x 6m - 5.47m2
    Delivery Time: 2 - 3 working days
    100mm URSA Party Wall Roll is a lightweight, non-combustible, unfaced glass mineral wool product used in masonry and timber framed walls to prevent party wall thermal bypass. In conjunction with edge sealing it helps achieve a zero U-value. This product is manufactured from sand, an abundant, sustai..
    Guide Price: £43.27
    £51.92 inc VAT
    Brand: Xtratherm Model and Size: 2400x1200 - 34.56m2
    Delivery Time: 2 - 3 working days
    25mm Xtratherm Safe-R is an exceptional rigid insulation solution with enhanced fire performance. It features a Class O phenolic foam core that emits negligible smoke obscuration. The insulation is clad with low emissivity aluminium facings on both sides, achieving a remarkable thermal conductivity ..
    Guide Price: £362.16
    £434.59 inc VAT
    Brand: Xtratherm Model and Size: 1200x450mm - 4.86m2
    Delivery Time: 2 - 4 days
    Xtratherm ThinR XT/CW Partial Fill Cavity Wall Insulation is the best solution when designers or regulations demand additional thermal insulation in external masonry walls, without a substantial increase in the width of the cavity. Xtratherm Thin-R boards achieve high standards of insulation wh..
    Guide Price: £48.74
    £58.49 inc VAT
    Brand: Unilin Insulation (formerly known as Xtratherm) Model and Size: 1200x450mm - 4.86m2
    Delivery Time: 2 - 4 days
    40mm Unilin ThinR XT/CW Partial Fill Cavity Wall Insulation Board is a PIR insulation board with a high thermal performance whilst maintaining a residual cavity in the external walls. This board achieves high standards of insulation with a certified thermal conductivity of 0.022W/mK with the op..
    Guide Price: £64.37
    £77.24 inc VAT
    Brand: YBS Insulation Model and Size: 2.5m
    Delivery Time: 1 - 2 days
    YBS Cavi-Mate EPS Cavity Closer is a new, robust window installation system ideal for the new build market. Manufactured from high quality PVC-U, it is a window former, locator and cavity closer, which enables Contractors to fit window frames quickly and easily by building around the sub-frame then ..
    Guide Price: £10.85
    £13.02 inc VAT
    Brand: Knauf Model and Size: 1200x600 - 8.64m2
    Delivery Time: 2 - 3 working days
    50mm Earthwool Flexible is a non-combustible, inorganic rock mineral wool slab, used for thermal and acoustic insulation and specifically designed for installation by friction fitting. Earthwool Flexible is odourless, non-hygroscopic, rot proof, does not sustain vermin and will not encourage th..
    £45.31
    £54.37 inc VAT
    Brand: Knauf Model and Size: 1200x600 - 4.32m2
    Delivery Time: 2 - 3 working days
    50mm Rocksilk RS100 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory appli..
    Guide Price: £54.60
    £65.52 inc VAT
    Brand: Knauf Model and Size: 1200x600 - 6.48m2
    Delivery Time: 1 - 2 days
    50mm Rocksilk RS60 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applie..
    Guide Price: £41.63
    £49.96 inc VAT
    Brand: Rockwool Model and Size: 1200x455 - 6.55m2
    Delivery Time: 8 - 12 weeks
    50mm Rockwool Full Fill Cavity Batt provides a completely reliable and cost-effective method of insulating new masonry cavity wall construction. It is BBA certified for use as full fill cavity wall insulation and is effective in reducing the thermal transmittance (U value) of new external cavity wal..
    Guide Price: £43.75
    £52.50 inc VAT
    Brand: Rockwool Model and Size: 1200x600mm - 8.64m2
    Delivery Time: 1 - 2 days
    50mm x1200mm x 600mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..
    £46.33
    £55.60 inc VAT
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