Wall Insulation
- Cavity wall insulation
- External wall insulation
- Insulated plasterboards
- Internal wall insulation
- Partition wall insulation
The benefits of properly sealed, moisture-protected, and insulated walls are:
- increased comfort
- reduced noise
- reduced energy cost
- reduced CO2 emissions
In order to achieve most effective results when installing wall insulation a number of key factors must be taken into consideration:
- Airtight constructionall air leaks should be sealed in the wall during construction and prior to insulation installation.
- Moisture controlexterior rain drainage system, continuous air barrier, and vapour barrier should be located on the appropriate side of the wall
- Complete insulation coverageadvanced framing should be used to maximize insulation coverage and reduce thermal bridging, no gaps or compressed insulation, and continuous insulated sheathing.
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 -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.
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).
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
- Cavity wall insulation
- Internal Insulation
- External insulation
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
- Ideally suited to refurbishment products.
- Wide range of products offered for this application.
- Suitable for natural insulation materials when used with a barrier
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25mm Celotex CW4000 Rigid PIR Cavity Insulation Board (pack of 20)
1200x450mm - 10.8m2 show quantity discountsDelivery Time: 3 - 5 days
Guide Price: £107.57 (£129.08 inc VAT)
£9.96/m2 (£11.95/m2 inc VAT)
show quantity discounts25mm 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 rigi..
12mm Celotex TB4000 PIR Insulation Board - TB4012
1200x2400mm - 2.88m2 Delivery Time: 2 - 3 days
Guide Price: £21.98 (£26.38 inc VAT)
£7.63/m2 (£9.16/m2 inc VAT)
Celotex TB4012 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..
27.5mm Xtratherm Thin-R Thermal Liner XT/TL-MF - Mech Fix (15mm PIR Insulation bonded to 12.5mm Plasterboard)
1200x2400 (2.88m2) show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £45.89 (£55.07 inc VAT)
£15.93/m2 (£19.12/m2 inc VAT)
show quantity discounts27.5mm 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..
24.5mm Xtratherm Thin-R Thermal Liner XT/TL-MF - Mech Fix (15mm PIR Insulation bonded to 9.5mm Plasterboard)
1200x2400 (2.88m2) show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £45.89 (£55.07 inc VAT)
£15.93/m2 (£19.12/m2 inc VAT)
show quantity discounts24.5mm Xtratherm Thin-R Thermal Liner XT/TL-MF is a composite insulated panel of 15mm Xtratherm Polyiso (PIR) core with foil faces bonded to 9.5mm tapered edge plasterboard for mechanically fixing to internal walls. XT/TL-MF is designed to provide high levels of thermal insulation and dry ..
50mm Celotex CG5000 Partial Fill Cavity Wall Board - pack of 11 - pallet of 16 packs
450x1200mm - 95.04m2 Delivery Time: 3 - 5 days
Guide Price: £1,411.39 (£1,693.67 inc VAT)
£14.85/m2 (£17.82/m2 inc VAT)
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..
25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)
1200x2400mm - 46.08m2
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..
25mm Celotex GD5025 PIR Insulation Board with 12.5mm Plasterboard (pack of 26)
1200x2400mm - 74.88m2 show quantity discountsDelivery Time: 3 - 5 days
£1,389.16 (£1,666.99 inc VAT)
£18.55/m2 (£22.26/m2 inc VAT)
show quantity discountsCelotex 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)
Celotex GS5025 - 74.88m2 show quantity discounts
Guide Price: £1,719.00 (£2,062.80 inc VAT)
£22.96/m2 (£27.55/m2 inc VAT)
show quantity discountsCelotex 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..
20mm Thermawall TW55 PIR Insulation Board Kingspan
TW55 - 1200x2400 show quantity discountsDelivery Time: 1 - 2 days
£29.27 (£35.12 inc VAT)
£10.16/m2 (£12.19/m2 inc VAT)
show quantity discounts20mm 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. The product is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Glob..
20mm Kooltherm K5 External Wall Insulation Board Kingspan (pack of 25) - 1200mm x 600mm
K5 1200x600 - 18 m2 show quantity discountsDelivery Time: In Stock 1-2 working days
£179.85 (£215.82 inc VAT)
£9.99/m2 (£11.99/m2 inc VAT)
show quantity discounts20mm 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
CT174 - 25kg show quantity discountsDelivery Time: 5 - 7 days
£58.00 (£69.60 inc VAT)
£5.80/m2 (£6.96/m2 inc VAT)
show quantity discounts1.5mm 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..
10mm Siniat BluClad Board
2400x1200mm - 2.88.m2 Delivery Time: 2 - 4 days
Guide Price: £60.03 (£72.04 inc VAT)
£20.84/m2 (£25.01/m2 inc VAT)
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 ..
25mm Thermawall TW50 PIR Cavity Wall Insulation Board (pack of 20)
TW50 - 1200x450 - 10.8m2 show quantity discountsDelivery Time: 3 - 5 days
Guide Price: £112.60 (£135.12 inc VAT)
£10.43/m2 (£12.52/m2 inc VAT)
show quantity discounts25mm Kingspan Thermapitch TW50 comprises of a high performance rigid thermoset insulation core faced on both sides with a low emissivity composite foil facing. The product is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential&nb..
15mm Xtratherm PIR Rigid Insulation Board
2400mm x 1200mm - 2.88m2 show quantity discountsDelivery Time: 3 - 5 days
Guide Price: £18.26 (£21.91 inc VAT)
£6.34/m2 (£7.61/m2 inc VAT)
show quantity discounts15mm 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..
25mm EPS70 Polystyrene Insulation Board Jablite (pack of 12)
2400x1200 (34.56m2) show quantity discountsDelivery Time: 2 - 3 days
£86.32 (£103.58 inc VAT)
£2.50/m2 (£3.00/m2 inc VAT)
show quantity discounts25mm 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..
25mm EPS70 Polystyrene Insulation Board Kay-Metzeler (pack of 12)
2400x1200mm - 34.56m2 show quantity discountsDelivery Time: 2 - 3 days
£80.67 (£96.80 inc VAT)
£2.33/m2 (£2.80/m2 inc VAT)
show quantity discounts25mm EPS70 Kay-Metzeler boards are produced by cutting expanded foam blocks. Placed above a concrete slab or a precast concrete floor in domestic ground-floor constructions, then finished with a wearing layer of chipboard to satisfy the Building Regulations' U-value requirements. Kay-Metzeler achiev..
25mm Earthwool RS45 Universal Insulation Slab Knauf (pack of 20)
1200x600 - 14.4m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £41.63 (£49.96 inc VAT)
£2.89/m2 (£3.47/m2 inc VAT)
show quantity discounts25mm Earthwool RS45 Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent ad..
25mm URSA Acoustic Insulation Roll
1.2x20m - 24.00m2 show quantity discountsDelivery Time: 1 - 2 days
Guide Price: £33.58 (£40.30 inc VAT)
£1.40/m2 (£1.68/m2 inc VAT)
show quantity discounts25mm 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..
25mm Xtratherm Safe-R Phenolic Insulation Board (pack of 12)
2400x1200 - 34.56m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £329.24 (£395.09 inc VAT)
£9.53/m2 (£11.44/m2 inc VAT)
show quantity discounts25mm Xtratherm Safe-R Phenolic foam is a superior performance rigid insulation with enhanced fire performance, consisting of a Class O phenolic foam core with negligible smoke obscuration. Safe-R is faced with low emissivity aluminium facings both sides, and has a thermal conductivity as low as 0.02..
25mm Yelofoam X2i Cellecta
2500x600mm - 1.5m2 Delivery Time: 2 - 4 days
Guide Price: £17.72 (£21.26 inc VAT)
£11.81/m2 (£14.17/m2 inc VAT)
25mm Cellecta Yelofoam is made of extruded polystyrene (XPS) foam blown with a mix of HFA & CO2 gases, containing a yellow pigment, flame retardant additive and nucleating agent. Cellecta insulation products are manufactured to the highest possible specification. Ex All products physical propert..
35mm Xtratherm Thin-R XT/CW Partial Fill Cavity Insulation (pack of 9)
1200x450mm - 4.86m2 show quantity discountsDelivery Time: 2 - 4 days
Guide Price: £40.28 (£48.34 inc VAT)
£8.29/m2 (£9.95/m2 inc VAT)
show quantity discountsXtratherm 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..
50mm Cavi-Mate EPS Cavity Closer
2.5m show quantity discountsDelivery Time: 1 - 2 days
£10.85 (£13.02 inc VAT)
show quantity discountsCavi-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 fitt..
50mm Earthwool Flexible Insulation Slab Knauf (pack of 12)
1200x600 - 8.64m2 show quantity discountsDelivery Time: 2 - 3 days
£45.31 (£54.37 inc VAT)
£5.24/m2 (£6.29/m2 inc VAT)
show quantity discounts50mm 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..
50mm Earthwool RS100 Universal Insulation Slab Knauf (pack of 6)
1200x600 - 4.32m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £35.43 (£42.52 inc VAT)
£8.20/m2 (£9.84/m2 inc VAT)
show quantity discounts50mm Earthwool Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent additiv..
50mm Earthwool RS60 Universal Insulation Slab Knauf (pack of 9)
1200x600 - 6.48m2 show quantity discountsDelivery Time: 1 - 2 days
Guide Price: £41.63 (£49.96 inc VAT)
£6.42/m2 (£7.70/m2 inc VAT)
show quantity discountsEarthwool RS60 Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent additiv..
50mm Rockwool Cavity Insulation Batt (pack of 12)
1200x455 - 6.55m2 show quantity discountsDelivery Time: 1 - 2 days
£27.04 (£32.45 inc VAT)
£4.13/m2 (£4.96/m2 inc VAT)
show quantity discounts50mm Rockwool Cavity Batt provides a completely reliable and cost-effective method of insulating new masonry cavity wall construction. Its BBA certified for use as full fill cavity wall insulation and is effective in reducing the thermal transmittance (U value) of new external cavity walls with maso..
50mm Rockwool Flexi Insulation Slab - 1200mm x 600mm (pack of 12)
1200x600mm - 8.64m2 show quantity discountsDelivery Time: 1 - 2 days
£30.79 (£36.95 inc VAT)
£3.56/m2 (£4.27/m2 inc VAT)
show quantity discounts50mm 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..
50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4
RW5 50mm - 2.88m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £28.81 (£34.57 inc VAT)
£10.00/m2 (£12.00/m2 inc VAT)
show quantity discounts50mm Rockwool RW5 (Prorox SL960) is a high quality resin bonded rigid slab for a wide range of thermal, acoustic and fire insulation requirements both within buildings and for industry. They are suitable for many applications including thermal insulation for floors, walls, roofs and boiler rooms. Th..
50mm ThermaFleece CosyWool Roll 370mm Wide (pack of 3)
13000x370 - 14.43m2 Delivery Time: 2 - 3 days
Guide Price: £64.68 (£77.62 inc VAT)
£4.48/m2 (£5.38/m2 inc VAT)
Thermafleece CosyWool roll 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 environmentall..
75mm DriTherm 32 Ultimate Cavity Slab Knauf (pack of 6)
1200x455mm - 3.28m2 show quantity discountsDelivery Time: 3 - 5 days
Guide Price: £22.98 (£27.58 inc VAT)
£7.01/m2 (£8.41/m2 inc VAT)
show quantity discounts75mm Earthwool DriTherm 32 Cavity Slab is a semi-rigid insulation material made from non-combustible, water repellent, glass mineral wool. They are 455mm wide to suit standard vertical wall tie spacings, ensuring a closed joint with adjacent slabs. Manufactured with Knauf ECOSE Technology - no ..