Cavity Wall Slab (CWS) 34 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 82% recycled glass
Manufactured with a water repellent binder
Achieves Eurofins Gold certification, the highest accreditation for indoor air quality
BBA approved – certificate 18/5560

Fire Classification

Euroclass A1 Reaction to Fire classification according to EN 13501-1.

Product Benefits

Thermal Performance - Thermal conductivity of 0.034 W/m.K. Helps to reduce heat loss within the building envelope and decrease energy costs.
Fire Classification - Achieves a Euroclass A1 Reaction to Fire classification, according to EN 13501-1.
BBA Certified - Cavity Wall Slab (CWS) 34 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. Please read the certification at insulation-UK.com/BBA for full details and restrictions.
Sustainability - Manufactured from up to 82% recycled glass on a plant that uses 100% renewable electricity. For further details visit insulation-uk.com/CSR
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.

Key Considerations

When using Isover Cavity Wall Slab (CWS) 34, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well as local, national and other applicable standards relevant for your construction or application, including requirements in relation to fire and applicable height restrictions.

Please refer to the following product documents:

Product Datasheet
BBA Certificate
Declaration of Performance
Safe Use Instruction Sheet

Declaration of Performance (DoP) : Cavity Wall Slab 32/34/36