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85mm Knauf DriTherm Cavity Wall Insulation Slab 37 (4.37m2/Pack)
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- Choose Clearpay at checkout to pay later with Pay in 4.
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Key Features
- {{home}} Use in external masonry cavity walls
- {{local_fire_department}} A1 non-combustible
- {{thermostat}} 0.037 W/mK thermal conductivity
- {{water_drop}} Water repellent
- {{public}} Zero Global Warming Potential (GWP)
- {{verified_user}} BBA certified
Technical Specification
| URN: | 3002129 |
|---|---|
| Product: | DriTherm 37 |
| Brand: | Knauf Insulation |
| Material Type: | Glass Mineral |
| Thickness: | 85mm |
| Width: | 455mm |
| Length: | 1200mm |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 4.37m2 |
| Pieces Per Pack: | 8 |
| Fire Rating: | A1 Non-Combustible |
| Thermal Conductivity: | 0.037W/mK |
| Manufacturer's Reference: | 316656 |
Technical Downloads
Product Overview
Full-fill glass mineral wool insulation slab, measuring 85mm in thickness, for use in masonry cavity walls.
Produced with a high recycled glass content and ECOSE® Technology, it delivers dependable thermal insulation while allowing vapour to pass through, supporting a healthier building fabric.
A thermal conductivity of 0.037 W/mK ensures effective energy efficiency, reducing heat loss and supporting compliance with modern Building Regulations.
With a Euroclass A1 non-combustible rating and full BBA certification for every UK exposure zone, it also provides confidence in fire protection, durability, and long-term performance.
At 85mm thick, the slab is suited to cavity widths that fall between traditional and modern standards, making it a practical choice for extensions, refurbishments, and new builds where non-standard dimensions are specified.
Features & Benefits
- Non-combustible Euroclass A1 fire rating: Ensures maximum fire safety in external walls.
- Thermal conductivity 0.037 W/mK: Consistent thermal efficiency for mid-width cavities.
- Water-repellent additive: Stops moisture transfer while staying vapour permeable.
- 455mm width: Fits standard wall tie spacing for a close jointed finish.
- Slabs knit together: Prevents air gaps and reduces thermal bridging.
- Lightweight and cuttable: Simple handling and fitting on site.
- ECOSE® Technology binder: No added formaldehyde and reduced embodied energy.
- 85mm thickness: For mid-width cavities in extensions, refurbishments, and non-standard new builds.
Applications
- Mid-width cavity walls (85mm): Suitable for properties with cavity widths narrower than modern 100mm standards.
- New build and extensions: Provides dependable thermal insulation where 85mm cavities are specified in design.
- Masonry cavity external walls: Ensures reliable, full-fill insulation with proven long-term performance.
- Energy efficiency upgrades: Helps reduce heat loss and improve compliance in projects aiming for improved U-values.
Installation Guidance
- Cut to fit: Slabs can be trimmed cleanly with a sharp knife for an accurate fit.
- Close-butt joints: Ensure slabs are tightly butted together with no gaps to maintain insulation performance.
- Keep dry before fitting: Store indoors or under cover to protect the slabs until installation.
Compliance & Performance
- Euroclass A1 to BS EN 13501-1: Highest level of non-combustibility.
- BBA certified for all exposure zones: Approved for UK use in severe weather locations.
Delivery & Returns Information
Delivery charges vary by product category and order value. Items may ship from different suppliers and arrive separately, so delivery charges can be shown per part of your order at checkout.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £45 ex. VAT |
| Over £400 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £90 ex. VAT |
| Over £400 ex. VAT | £55 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
How delivery works
We work with a nationwide network of trusted suppliers. Items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you will see delivery charges shown at checkout for each part of your order. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery areas
Delivery charges apply to mainland UK, excluding: AB, CA, CF, DD, DG, EH, EX, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, PL, SA, SY, TR, TQ and TD.
If your address is in one of these areas, we will contact you before processing your order to confirm any additional costs. We do not currently offer delivery outside the UK mainland.
What to expect on delivery day
- Deliveries are typically kerbside.
- Please ensure someone is on-site to accept delivery. For heavier items, help with offloading may be required.
- Many building materials arrive on large vehicles. If access is restricted, a specialist vehicle such as a HIAB may be required and could incur an additional charge.
Why delivery can cost more than typical parcel delivery
Building materials often travel on larger vehicles and usually carry fewer drops per run than parcel networks. That is why delivery charges can be higher than standard e-commerce shipping.
Returns
Returns depend on what you have bought and whether there is anything wrong with it. For full details on eligibility, timeframes, and exclusions, please see our full policy.
