Isover Cavity Wall Slab CWS 36

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Delivery within 3 - 5 working days

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Over £599.95 Ex-Vat

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Cavity Wall Slab (CWS) 36 is a glass mineral wool slab providing thermal performance in external masonry cavity walls. Manufactured with a water repellent binder, the strong, resilient and flexible slabs are 455mm wide to fit between standard wall tie spacing.
Product Features
  • 1200 x 455mm mineral wool slab
  • Manufactured from up to 75% recycled glass
  • Manufactured with a water repellent binder
  • BBA Approved – certificate 18/5560
  • Achieves an A+ generic rating within the BRE Global Green Guide
  • Euroclass A1 Reaction to Fire classification according to EN 13501-1.
  • Thermal conductivity of 0.036 W/m.K.
  • Helps to reduce heat loss within the building envelope and decrease energy costs • Manufactured with a water repellent binder
Product Benefits
  • Thermal Performance - Thermal conductivity of 0.032 W/m.K. Helps to reduce heat loss within the building envelope and decrease energy costs.
  • Sustainability - Achieves a BRE Green Guide of A+ which can assist in demonstrating environmental performance in your BREEAM assessments. Manufactured from up to 75% recycled glass on a plant that uses 100% renewable electricity.
  • BBA Certified - Cavity Wall Slab (CWS) 32 has been assessed by the BBA as fit for use in defined full fill and partial fill masonry cavity wall applications if installed, used and maintained as set out in the certificate. 
  • Fire Classification - Achieves a Euroclass A1 Reaction to Fire classification, according to EN 13501-1.
  • Easy to Install - Slabs are 455mm wide to fit standard wall tie spacing for straightforward installation. No requirement for retaining discs when fully filling the cavity.
  • Data Sheet - Click Here


Order Value Delivery Charge
Up to £200.00 ex-vat £100.00 ex-vat
£200.00 - £599.95 ex-vat £59.95 ex-vat
Above £599.95 ex-vat Free Delivery


Weekend Delivery
Available upon request


Parcel Rates
Delivery charge may vary depending on quantity and volume of your order.
Pricing will be calculated during checkout.


Local Delivery Charge
Within 35 miles of Postcode S63 9BL - Up to £500.00 ex-vat
Delivery Charge £35.00 ex-vat
Please contact us to arrange collections
Tel: 0300 303 4578 | Email:


Delivery charges will automatically be calculated within the checkout process.
Orders are only processed for delivery between 8.00am - 5.00pm Monday to Friday excluding bank holidays.
Moffett offload will be used for large bulky deliveries and only when agreed with you.
Please advise of any access issues on ordering.
Delivery is Kerbside only.
In the unlikely event that your delivery is not correct or damaged please notify us immediately and mark any issues on the delivery slip.


    Where We Deliver

    Delivery Areas

    We have a fleet of FORS delivery vehicles all with Moffett mechanical off loads that deliver nationwide. Sometimes we may use 3rd party carriers for smaller orders.


      Product Delivery Times

      The vast majority of our orders are dispatched within 3 working days, this can however be up to 5 working days, please contact us if you require something urgent.
      Speciality items may take up to 5-7 working days.
      We will contact you with in 24/48hrs of your order been placed to confirm delivery times and dates.

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