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Cavity Wall Insulation

External walls in majority of houses in UK are made of two layers with a gap or ‘cavity’ between them. Filling the gap with insulation during construction significantly improves energy efficiency of the house.

Two options are available when insulating a cavity wall:

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
Insulating your house with glass or mineral wool cavity insulation products found in insulationshop.co not only saves you money on your energy bills but also greatly reduces carbon dioxide emission of your house allowing you to reduce your impact on a global warming and make your home environmentally friendly. Our cavity insulation in this category comes in a form of a glass wool slab (batt) in quantities of 5, 7 and 8 slabs per pack.

R-value Comparison Chat for Cavity Wall Insulation for products available at Insulation Shop

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CHOOSE MANUFACTURERS

Brand: Isover Model and Size: 65mm CWS 32 - 6.55m2
Delivery Time: 2 - 3 working days
65mm Isover CWS 32 batt is a dense glass wool insulation product, providing high thermal performance in masonry cavity wall insulation, applicable in various type of buildings including domestic, commercial, industrial, health, retail, education. The products density allows it to have extremely..
Brand: Isover Model and Size: 455x1200mm - 10.92m2
Delivery Time: 2 - 3 working days
50mm ISOVER Cavity Wall Slab (CWS) is a non-combustible, silicone impregnated glass mineral wool thermal insulation in masonry cavity walls in full-fill applications. It is designed to be installed during construction in the cavity between two masonry leaves in external walls. Meets Part L Buil..
£45.49
£54.59 inc VAT
Brand: Superglass Model and Size: 1200x455mm - 8.74m2
Delivery Time: 1 - 2 days
50mm Superwall 36 Cavity Wall Batt is a lightweight, non-combustible, unfaced glass mineral wool batt for use as full or partial fill insulation in new external masonry cavity walls up to 25 m in height in domestic and non-domestic buildings. Superwall 36 is manufactured from nearly 84% recycled gla..
75mm DriTherm 32 Ultimate Cavity Slab Knauf (pack of 6)
Guide Price
Brand: Knauf Model and Size: 1200x455mm - 3.28m2
Delivery Time: 3 - 5 days
75mm 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 added..
Guide Price: £33.88
£40.66 inc VAT
75mm Knauf  DriTherm Cavity Slab 34 Super (pack of 10)
Guide Price
Brand: Knauf Model and Size: 1200x455mm - 5.46m2
Delivery Time: 2 - 3 working days
75mm Knauf Earthwool DriTherm Cavity Slab 34 Super are semi-rigid or rigid slabs of 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. This product has a special addit..
Guide Price: £63.22
£75.86 inc VAT
50mm DriTherm 37 Standard Cavity Slab Knauf (pack of 12)
Guide Price
Brand: Knauf Model and Size: 1200x455 -6.55m2
Delivery Time: 3 - 5 days
50mm DriTherm 37 Standard Cavity Slabs are rigid slabs of non-combustible, glass mineral wool with a water-repellent additive. They are 455mm wide to suit standard vertical wall tie spacing, ensuring a closed joint with adjacent slabs. This product has a special additive to make it water repellent.A..
Guide Price: £28.39
£34.07 inc VAT
50mm Rockwool Full Fill Cavity Insulation Batt (pack of 12)
Guide Price
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: £51.43
£61.72 inc VAT
30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15
Guide Price
Brand: Rockwool Model and Size: 1200x600mm - 10.8m2
Delivery Time: 2 - 3 working days
30mm Rockwool RW3 Slab (Prorox SL 930) is a semi-rigid resin bonded slab, providing great thermal, acoustic and fire resistance, designed to be used in various applications in floors, walls and roofs, including special applications in industrial buildings for insulation of  ships, offshore plat..
Guide Price: £58.64
£70.37 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: £206.61
£247.93 inc VAT
40mm Celotex CW4040 - Rigid PIR Cavity Insulation Board (pack of 14) CW4000
Guide Price
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: £58.29
£69.95 inc VAT
35mm Xtratherm Thin-R XT/CW Partial Fill Cavity Insulation (pack of 9)
Guide Price
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: £52.64
£63.17 inc VAT
40mm Unilin Thin-R XT/CW Partial Fill Cavity Insulation Board (pack of 9) 40mm Unilin Thin-R XT/CW Partial Fill Cavity Insulation Board (pack of 9)
Guide Price
Brand: Unilin (prev. 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: £69.52
£83.42 inc VAT
90mm Thin-R CT/PIR Cavity Therm Full Fill Insulation Xtratherm (pack of 4)
Guide Price
Brand: Xtratherm Model and Size: CT/PIR 1200x450 - 2.16m2
Delivery Time: 1-3 working days
90mm Xtratherm CavityTherm wall insulation board is a high performance composite board of enhanced PIR core with a lambda value of 0.021W/mK. The boards have gas tight facings with one face bonded to a profiled HIPS skin during manufacture to provide a drainage plane. CavityTherms unique engine..
Guide Price: £79.47
£95.36 inc VAT
100mm Unilin Thin-R CT/PIR CavityTherm Full Fill Insulation (pack of 4) 100mm Unilin Thin-R CT/PIR CavityTherm Full Fill Insulation (pack of 4)
Guide Price
Brand: Unilin (prev. Xtratherm) Model and Size: 1200mm x 450mm - 2.16m2
Delivery Time: 1-3 working days
100mm Unilin CavityTherm wall insulation board is a high performance composite board of enhanced PIR core with a lambda value of 0.021W/mK. The boards have gas tight facings with one face bonded to a profiled HIPS skin during manufacture to provide a drainage plane. Unilin CavityTherm's unique ..
Guide Price: £80.21
£96.25 inc VAT
Brand: Kingspan Model and Size: 1200x450mm - 2.16m2
Delivery Time: 1-3 working days
90mm 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 and uncontr..
£88.70
£106.44 inc VAT
Brand: Kingspan Model and Size: 1200x450mm - 5.40 m2
Delivery Time: 3 - 5 days
50mm Kingspan Kooltherm K108 Cavity Board is a premium performance rigid thermoset fibre-free phenolic insulation core faced on both sides with a low emissivity composite foil. It is specifically designed to limit thermal bridging and uncontrolled airleakage via junctions in cavity wall construction..
£133.84
£160.61 inc VAT
10mm Grey Polystyrene (Graphite EPS) for External Wall Insulation (pack of 60)
sale!
Brand: Arbet Model and Size: 1000x500mm - 30m2
Delivery Time: In Stock 1-2 working days
10mm Grey Polystyrene (Graphite) is a high quality expanded polystyrene (EPS) board enhanced with integrated graphite within its bead structure and of grey colour. The high-purity graphite particles integrated within the insulation beads reflects radiant heat and significantly improves insulati..
£39.33 (£47.20 inc VAT)
£35.79
£42.95 inc VAT
10mm White Polystyrene Board (EPS) for External Wall Insulation (pack of 60)
sale!
Brand: Arbet Model and Size: 1000x500mm - 30m2
Delivery Time: In Stock 1-2 working days
10mm White Polystyrene Board is a very lightweight and easy to handle and install, expanded polystyrene (EPS) board specially designed to be used as a part of various external wall insulation systems. It can be used in applications requiring transfer of small mechanical loads.Please note polystyrene..
£36.29 (£43.55 inc VAT)
£33.02
£39.62 inc VAT
50mm YBS Cavi-Mate EPS Cavity Closer
Guide Price
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: Kingspan Model and Size: thermabate
Delivery Time: 3 - 5 days
85mm Thermabate Cavity Closer, an innovative solution designed to maintain continuous insulation around window and door openings. Crafted with a rigid thermoset urethane insulation core, this cavity closer box section ensures optimal thermal performance and condensation control. It adapts seamlessly..
£223.88
£268.66 inc VAT
Brand: Kingspan Model and Size: 100x2400mm
Delivery Time: 5 - 7 days
100mm Kingspan Kooltherm Cavity Closer is a PVCU extrusion with a rigid thermoset insulation core, which provides a simple and efficient method of closing cavities around openings in cavity walls. It is suitable for use with timber, metal or PVC window frames and can also be supplied to order in cur..
£182.30
£218.76 inc VAT
Brand: Teco Model and Size: 250
Delivery Time: 1 - 2 days
For use with standard wall ties in partial fill cavity wall insulating, suitable for PIR rigid insulation boards or wool slabs (batts).These clips hold insulation in place and help to keep the rest of the cavity space clear.Improve the effective thickness of a wall under loadMaintain the moisture br..
£25.31
£30.37 inc VAT
Brand: Kingspan Model and Size: extensionclip
Delivery Time: 2 - 3 working days
Flange Extension Clip for connecting Kingspan Thermabate to extend the width of the fixing flange. It enables positive fixing of frame over suspect masonry. Supplied in one meter lengths. Colour coded to white.CERTIFICATIONKingspan Thermabate is manufactured to the highest standards under a manageme..
Brand: Kingspan Model and Size: jointingclip
Delivery Time: 2 - 3 working days
Jointing Clip connects two sections backtoback along their length to suit cavity widths of up to 300 mm in circumstances where a single section, Kingspan Kooltherm Thermabate Cavity Closer or Kingspan Kooltherm Cavity Closer will not suffice. It should be installed in 100 mm lengths at 300 mm centre..
Standard Flange Clip for Kingspan Thermabate Cavity Closer 1m length
Guide Price
Brand: Kingspan Model and Size: flangeclip
Delivery Time: 2 - 3 working days
Standard Flange Clip for use with Kingspan Thermabate Cavity Closers and for use as a weather check, for fixing closer sections to window frames, and for retaining partial fill insulation batts in the cavity. Supplied in one meter lengths. Colour coded to green.CERTIFICATIONKingspan Thermabate is ma..
Guide Price: £2.93
£3.52 inc VAT
Brand: Kingspan Model and Size: revealclip
Delivery Time: 2 - 3 working days
26mm Reveal Clip to help construction of check reveals and gives additional protection to the frame assembly.Supplied in one meter lengths. Colour coded to white.CERTIFICATIONKingspan Thermabate is manufactured to the highest standards under a management system certified to ISO 9001: 2015 (Quality m..
Brand: Teco Model and Size: WT225 - free delivery
Delivery Time: 1 - 2 days
Housing Tie - Light Duty Wall Tie suitable for box form domestic dwellings with leaves of similar thickness up to 10m high.Tested as type A (sound)Tested as Type 4 (strength) to BS EN 845-1BBA CertifiedStainless SteelA number of key factors must be taken into consideration to conform to building reg..
£55.22
£66.26 inc VAT
Brand: Kingspan Model and Size: jointingstrip
Delivery Time: 3 - 5 days
Jointing Strip that aligns and connects two abutting cavity closer sections along their cross–sectional plane. It allows for opening sizes greater than 2.4 metres, and for the reduction of wastage through the use of off–cuts. Limited to one butt joint per side of the opening.. Colour coded to Grey.C..
Brand: Celotex Model and Size: 1190x450mm - 3.24m2
Delivery Time: 2 - 4 days
90mm Celotex Thermaclass Cavity Wall 21 is a high performance rigid PIR full fill cavity insulation board with low emissivity foil facings offering enhanced thermal performance (0.021 W/m.K) within cavity air spaces. It can be installed with up to a 10mm residual cavity or as a full fill solut..
£82.06
£98.47 inc VAT
50mm Kingspan Kooltherm K112 Framing Board (pack of 6)
Guide Price
Brand: Kingspan Model and Size: 1200x2400mm - 17.28m2
Delivery Time: 5 - 7 days
50mm Kingspan Kooltherm K112 Framing Board is a a premium performance insulation with a fibre-free rigid thermoset phenolic core used for timber and steel framing systems. The rigid board is covered with low emissivity composite foil on both sides. Kooltherm K112 is implemented to improve therm..
Guide Price: £575.58
£690.70 inc VAT
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