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85mm Knauf DriTherm Cavity Wall Insulation Slab 32 (2.73m2/Pack)
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Glass mineral wool slab for full-fill masonry cavity walls. Thermal conductivity 0.032 W/mK provides enhanced insulation performance. 85mm thickness suits mid-width cavities in extensions and upgrades.
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Product Overview
Glass mineral wool slab for full-fill masonry cavity walls. Thermal conductivity 0.032 W/mK provides enhanced insulation performance. 85mm thickness suits mid-width cavities in extensions and upgrades.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £15 ex. VAT |
| Between £100 - £300 ex. VAT | £10 ex. VAT |
| Over £300 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 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 |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{home}} Use in external masonry cavity walls
- {{local_fire_department}} A1 non-combustible
- {{thermostat}} 0.032 W/mK thermal conductivity
- {{water_drop}} Water repellent
- {{public}} Zero Global Warming Potential (GWP)
- {{verified_user}} BBA certified
Technical Specification
| Product: | DriTherm 32 |
|---|---|
| Material Type: | Glass Mineral |
| Thickness: | 85mm |
| Width: | 455mm |
| Length: | 1200mm |
| Pieces Per Pack: | 5 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 2.73m2 |
| Brand: | Knauf Insulation |
| Manufacturer's Reference: | 715830 |
| Thermal Conductivity: | 0.032W/mK |
| Fire Rating: | A1 Non-Combustible |
Technical Downloads
Product Overview
Full-fill glass mineral wool insulation slab, measuring 85mm in thickness, for use in masonry cavity walls.
Manufactured with a high recycled glass content and ECOSE® Technology, it delivers advanced thermal insulation while remaining vapour permeable, helping the wall construction to breathe.
With a thermal conductivity of 0.032 W/mK, it provides superior energy efficiency, enabling lower U-values to be achieved at reduced insulation thicknesses.
Rated Euroclass A1 non-combustible and fully BBA certified for all UK exposure zones, it ensures proven fire safety, durability, and long-term reliability.
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 0.032 W/mK: Enhanced insulation performance for mid-width walls.
- 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.
