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Isover Batt - CWS 36 (1.2m x 0.45m) All Sizes

£28.99Ex. VAT.£34.79Inc. VAT.

Currently out of stock
Currently out of stock
Currently out of stock
Currently out of stock
Currently out of stock
Currently out of stock

Isover Batt - CWS 36 (1.2m x 0.45m) All Sizes

£28.99Ex. VAT.£34.79Inc. VAT.

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Isover Batt - CWS 36 (1.2m x 0.45m) All Sizes

£28.99Ex. VAT.£34.79Inc. VAT.

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Standard Delivery

A silicone impregnated glass mineral wool slab bonded with thermo-setting resin. This sturdy constructed Isover batt cavity wall slab is used to provide thermal insulation in the masonry cavity walls in full-filled applications in mult-storey construction. It is in compliance with BBA specifications for all exposure zones and is completely fire safe. This non-combustible cavity wall slab is easy to cut, handle and install. 

Features / Benefits:

    • Non combustible
    • Silicon impregnated
    • CFC and HCFC Free
    • Robust owing to fibrous faces
    • Leaves no airspaces
    • Ideal for full-filled applications in multi-storey construction.
    • Excellent thermal performance
    • Excellent acoustic properties.
    • Zero Ozone Depletion Potential and Zero Global Warming Potential
    • A+ rating according to Bre Green Guide, thus environmental friendly.
    • Minimal flanking sound transmission along the wall cavity.
    • Can be used for building up to and including 25 meters in height.

In order to meet the Part L building regulations, this non-combustible and silicone impregnated cavity wall slab is available in wide range of thicknesses compatible with conventional wall tie spacing.


Easy to cut and handle, this cavity wall slab is safer and simpler to install. It is installed in the cavity between two masonry leaves in external walls.


Technical characteristics:

    • Thermal resistance: K value of 0.036 W/mK
    • Fire rating: Euroclass A1.
    • Low U-values: 0.19W/m2K
    • Under BSI Quality Management Standard BS EN ISO 9001:2000.
Brand Isover
Coverage 3.28m2, 6.55m2, 8.74m2, 10.92m2
Length 1200mm
Material type Glasswool
Thermal conductivity 0.036 W/mK
Thickness 50mm,65mm,75mm,85mm,100mm,150mm
Width 455mm
Delivery Info

Free Delivery T&C's

Free Delivery on all standard delivery orders when you spend over £300 ex. VAT.
This offer does not apply to special order items (read more below).

All orders under £300 ex. VAT incur a £25 ex. VAT delivery charge. 


Build4Less go to great lengths to ensure each customer receives the lowest possible delivery charges for their purchase. We would like to give it to you free, and sometimes we can! However sometimes unfortunately we must charge for special order items to meet the additional charges imposed on us from various manufacturers.

Below you can view a list of all our Special Order delivery fees (excluding VAT)

Product Range Delivery Fee
Celotex £30 under £200 | £25 under £300 | Free over £300
Armorgard Orders under £300 = £15 | Free Delivery on orders over £300
Lead Flashing Rolls less than 100kg =£45 | between 101-499kg = £25 | above 499kg = FREE
EnviroBuild Furniture £125 per order. If your order of EnviroBuild Furniture exceeds £499 delivery is FREE
EnviroBuild (Other) £150 per order on EnviroBuild orders containing non furniture related products
EnviroBuild (Parcel) £12.99
ARC £35 per order
Ryno Orders under £300 have a £20 delivery charge.
RynoTerrace Orders under £1000 have a £75 delivery charge.
Ryno Porcelain Orders under £500 have a £75 delivery charge.
Clear Amber £13.50 per order (£55 to Ireland)
SISU Flooring £75 per order
Karma £50 per order
iKoustic £19.95 on orders under 20kg | £49 on orders under 200kg | £59 on orders under 900kg
H & H Acoustics £100 per order
Sheepwool £12 per pack
Building Blocks £25 delivery on orders under £200 | If order exceeds £200 delivery is FREE
Facing Bricks 1-4 bundles = £75 | 5-8 bundles = £150 | 9-12 bundles = £225 | 12+ bundles = Call to Inquire
VELUX £30 per order
Dalsan Skimcoat £25 on orders under £500
FREE DELIVERY on orders over £500
Danosa £65 per order
Danosa Geotextile Fleece £95 per order
Fix Factory, Portwest, JSP, Etag, Stanley, Faithfull, Dronco, Blue Spot, Estwing, Ragni Orders under £100 = £7.50 | £100+ = FREE DELIVERY
Everbuild, Faithful, Primaflow Orders under £75 = £10 | £75+ = FREE DELIVERY
Proctor Orders under £500 = £25
Orders between £501 - £999 = £50
Order value £1000 + = FREE DELIVERY
Wetherby Orders under £1000 = £100
Orders between £1000 - £4499 = £80
Order value £4500+ = FREE DELIVERY