Premium glass mineral wool slabs, meticulously engineered for external masonry cavity walls. These slabs boast a water-repellent binder and are comprised of up to 82% recycled glass, reflecting our commitment to sustainability.

The Isover CWS 32 offers exceptional ease of installation, effortlessly fitting within standard wall tie spacings, and carries the renowned BBA certification. With a Euroclass A1 fire rating, it ensures maximum safety and peace of mind, whether for residential or commercial projects seeking enhanced energy efficiency. Manufactured using 100% renewable electricity, this insulation solution supports sustainable building practices without compromising quality or durability. An impressive thermal conductivity of 0.036 W/m.K efficiently reduces heat loss, contributing to lower energy costs. In dimensions of 1200 x 455mm and a practical 150mm thickness, the Isover CWS 32 seamlessly blends innovation with eco-consciousness, underpinning the transition to greener building methods.

  • Thickness: 150mm
  • Coverage: 2.18ms per pack
  • Size: 1200 x 455mm
  • For use in external masonry cavity walls
  • Thermal conductivity: 0.036 W/m·K
  • Made from glass mineral wool
  • Fire rated Euroclass A1 for safety
  • Contains up to 82% recycled glass
  • Installs easily, aligning with wall ties

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

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Isover 150mm CWS 32 Cavity Wall Insulation Slab 2.18m2

  • £37.85
  • (Delivery from £13.03 )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Wednesday 14th October? Order within 4 days, 12 hours, 46 minutes