Description
Knauf DriTherm® Cavity Slab 37 is a high-quality, water-repellent glass mineral wool insulation designed for full-fill external masonry cavity walls. Offering a thermal conductivity of 0.037 W/m·K, these slabs deliver reliable thermal performance while also enhancing fire safety and long-term durability.
Lightweight, easy to handle, and simple to cut to size, DriTherm® 37 slabs friction fit neatly between wall ties without the need for retaining discs. They adapt to slight imperfections in the substrate and knit together to minimise air gaps, ensuring consistent insulation performance throughout the cavity.
Non-combustible with the best possible Euroclass A1 fire rating, they help reduce the risk of fire spread and eliminate the need for cavity barriers. Manufactured with ECOSE® Technology, a sustainable, bio-based binder, they are free from ozone-depleting substances, greenhouse gases, and harmful chemicals.
Approved by the BBA for use in all exposure zones – even very severe areas – these slabs can be installed in buildings up to 12m high, or up to 25m in multi-storey applications.
Key Benefits
• Excellent thermal performance (λ = 0.037 W/m·K)
• Euroclass A1 non-combustible – no cavity barriers required
• BBA approved for use in all exposure zones
• Water-repellent and prevents moisture transmission across cavities
• Easy to handle, cut, and install – no retaining discs needed
• Adapts to uneven substrates and knits together to minimise air gaps
• Odourless, rot-proof, and resistant to mould, fungi, bacteria, and vermin
• Manufactured with ECOSE® Technology – eco-friendly and sustainable
• Supplied in protective polythene packs
Product Specifications
• Length: 1200mm
• Width: 455mm
• Thickness: 50mm
• Pack coverage: 6.55m² (12 slabs)
• R-Value: 1.35m²K/W
• Thermal conductivity: 0.037 W/m·K
• Water vapour resistivity: 5.00MNs/g.m
• Fire rating: Euroclass A1
• Certification: BBA No. 95/3212
• Green Guide Rating: A+