.jpg)
.jpg)
.jpg)
75mm Knauf DriTherm Cavity Wall Insulation Slab 32 (3.28m2/Pack)
Product
Coverage required
Glass mineral wool slab for full-fill masonry cavity walls. Thermal conductivity 0.032 W/mK provides enhanced insulation performance. 75mm thickness suits older properties with non-standard cavity depths.
Product
Nationwide Delivery
Mon 29 Sep
- 0days
- 14hrs
- 3mins
- 1secs
Learn more
Pay in 3 interest-free payments
Split your purchase of £34.64 into 3 with no sign-up fees or late fees.
£404.13
today
£404.13
1 month
£404.13
2 months
How it works
- Choose PayPal at checkout to pay later with Pay in 3.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Pay in 3 is a form of credit, so carefully consider whether the purchase is affordable and how you will make the repayments. Be aware of the possible impact of using Pay in 3 and of missing payments, including making other borrowing more difficult or more expensive. Pay in 3 eligibility is subject to status and approval. 18+ UK residents only. Available for purchases of £30 to £2,000. Terms and conditions apply. PayPal Pay in 3 is a trading name of PayPal (Europe) S.à r.l. et Cie, S.C.A. 22-24 Boulevard Royal L-2449, Luxembourg.
Learn more
Buy now. Pay with Klarna at your own pace.
Get what you need for your next project, choose how you pay.
Pay in 30 days
£34.64
Pay in full
Klarna's Pay in 30 days is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
Pay over time
£404.13
Every 30 days
Pay in 3
£404.13
today
£404.13
in 30 days
£404.13
in 60 days
Klarna's Pay in 3 is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
How it works
- At checkout select Klarna.
- Choose your payment plan.
- Different payment plans may be shown depending on the purchase amount and credit score.
- Complete your checkout.
- The amount will be charged based on the payment plan you chose.
Learn more
Pay in 4 interest-free payments
Split your purchase of £34.64 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
£303.10
today
£303.10
second payment
£303.10
third payment
£303.10
fourth payment
How it works
- Choose Clearpay at checkout to pay later with Pay in 4.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Clearpay is unregulated credit. Use responsibly. 18+, T&Cs and late fees apply at clearpay.co.uk/en-GB
Clearpay lends you a fixed amount of credit so you can pay for your purchase over 4 instalments, due every 2 weeks. Ensure you can make repayments on time. You must be 18+ and a permanent UK resident (excl Channel Islands). Clearpay charges a £6 late fee for each late instalment and a further £6 if it’s still unpaid 7 days later. Late fees are capped at £6 for orders under £24 and the lower of £24 or 25% of the order value for orders over £24. Missed payments may affect your ability to use Clearpay in the future and your details may be passed onto a debt collection agency working on Clearpay’s behalf. Clearpay is credit that is not regulated by the Financial Conduct Authority. T&Cs and other eligibility criteria apply at clearpay.co.uk/terms
Product Overview
Glass mineral wool slab for full-fill masonry cavity walls. Thermal conductivity 0.032 W/mK provides enhanced insulation performance. 75mm thickness suits older properties with non-standard cavity depths.
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: | 75mm |
| Width: | 455mm |
| Length: | 1200mm |
| Pieces Per Pack: | 6 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 3.28m2 |
| Brand: | Knauf Insulation |
| Manufacturer's Reference: | 715827 |
| Thermal Conductivity: | 0.032W/mK |
| Fire Rating: | A1 Non-Combustible |
Technical Downloads
Product Overview
Full-fill glass mineral wool insulation slab, measuring 75mm 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 75mm thick, the slab is designed for narrower cavity widths or refurbishment projects, providing a practical insulation solution where space is limited while still ensuring reliable thermal and acoustic performance.
Features & Benefits
- Non-combustible Euroclass A1 fire rating: Ensures maximum fire safety in external walls.
- Thermal conductivity 0.032 W/mK: High 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.
- 75mm thickness: Suited to mid-width cavities in older properties and extension projects.
Applications
- Mid-width cavity walls (75mm): Designed for older properties with non-standard cavity sizes.
- Extensions and retrofits: Practical insulation where 100mm cavities are not available.
- Masonry cavity external walls: Provides reliable long-term performance in housing.
- Renovation projects: Improves insulation levels in older housing stock.
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.
