Knauf Insulation DriTherm® Cavity Slab 32 | All Sizes

KnaufSKU: IUK00864

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Knauf Insulation DriTherm® Cavity Slab 32: Advanced Thermal and Moisture Protection for Masonry Cavity Walls


Knauf Insulation DriTherm® Cavity Slab 32 - Your ultimate solution for external full-fill masonry cavity walls. 

These water-repellent glass mineral wool slabs offer exceptional thermal conductivity of 0.032W/mK, ensuring your space stays warm and energy efficient. Certified non-combustible with the highest Euroclass A1 fire reaction classification, DriTherm® Cavity Slabs are manufactured using Knauf Insulation’s unique bio-based binder, ECOSE® Technology.

Key Benefits

  • Moisture Resistance: Infused with a water-repellent additive, DriTherm® Cavity Slabs resist moisture ingress, maintaining their integrity and thermal properties even in very severe exposure zones.
  • Certified Quality: Proudly holding an Agrément certificate from the BBA, Knauf Insulation DriTherm® Cavity Slabs meet stringent standards for use across all exposure zones, ensuring reliable performance.
  • Perfect Fit: Designed to adapt seamlessly to wall imperfections, these glass mineral wool cavity wall insulation slabs knit closely together, eliminating air gaps, and ensuring consistent thermal efficiency throughout the building’s lifespan.
  • Installation Simplicity: Friction fit between wall ties eliminates the need for ancillary products like retaining discs or jointing tape, simplifying the installation process.
  • Comprehensive Insulation Solution: Provides a full-fill insulation solution that requires no additional cavity barriers to meet Approved Document B fire safety requirements.

Knauf Insulation DriTherm® Cavity Slab 32's available sizes

Thickness Thermal Resistance Length Width Rolls Per Pack Area Per Pack
75mm 2.3m2K/W 1200mm 455mm 6 3.276m2
100mm 3.1m2K/W 1200mm 455mm 6 3.276m2
125mm 3.9m2K/W 1200mm 455mm 4 2.1842m2
150mm 4.65m2K/W 1200mm 455mm 4 2.1842m2

Product Specifications

Specification Value
Thermal Conductivity  0.032W/mK
Fire Classification A1
Generic BRE Green Guide Rating A+
Vapour Resistivity 5.00 MNs/g.m
Manufactured Density <10kg/m³ 


Knauf Insulation DriTherm® Cavity Slabs are primarily used for thermal insulation in both residential and commercial external masonry cavity walls. 

These glass mineral wool slabs are installed as the wall is constructed, fitting snugly between the inner and outer leaves and around wall ties. 

DriTherm® Cavity Slabs’ width is optimally designed to match standard vertical wall tie spacings, ensuring tight joints and continuous insulation coverage. The addition of a water-repellent additive further enhances moisture defence, making these. These glass mineral wool cavity wall insulation slabs an excellent choice for any construction in challenging environments.

Frequently Asked Questions (FAQs)

What is the advantage of using Knauf Insulation DriTherm® Cavity Slabs for cavity wall insulation?

Knauf Insulation DriTherm® Cavity Slabs are designed to provide superior thermal performance with a thermal conductivity of 0.032 W/mK. These glass mineral wool slabs are specifically engineered for full-fill masonry cavity wall applications, ensuring a snug fit and maximum energy efficiency.

How do Knauf Insulation DriTherm® Cavity Slab 32's handle moisture?

The DriTherm® Cavity Slabs include a water-repellent additive that helps resist moisture ingress, making them an excellent choice for use in all exposure zones, including those deemed 'Very Severe.' This feature ensures long-term durability and consistent thermal performance.

Can Knauf Insulation DriTherm® Cavity Slabs be used in any residential project?

Yes, Knauf Insulation DriTherm® Cavity Slabs are suitable for use in both residential and non-residential external masonry cavity walls. Their design allows for installation during the wall-building process, ensuring seamless integration without the need for additional barriers to meet fire safety requirements.

What makes glass mineral wool slabs like DriTherm® ideal for cavity wall insulation?

Glass mineral wool slabs, such as Knauf Insulation DriTherm® Cavity Slabs, offer excellent thermal and acoustic insulation properties. They are non-combustible, moisture-resistant, and made with sustainable materials, making them an environmentally friendly choice for cavity wall insulation.

Why choose full-fill cavity wall insulation with Knauf Insulation's products?

Full-fill cavity wall insulation with Knauf Insulation products, like the DriTherm® Cavity Slabs, ensures that the entire cavity is filled with insulation, eliminating air gaps and significantly improving the wall’s thermal performance. This method is highly effective in reducing heat loss and is easy to install, providing a cost-effective insulation solution.

What certifications do Knauf Insulation DriTherm® Cavity Slabs hold?

Knauf Insulation DriTherm® Cavity Slabs are certified with an Agrément certificate by the BBA, ensuring that they meet high standards of quality and performance for use across various exposure zones. This certification provides assurance of their suitability and safety for building projects.

How does glass mineral wool cavity wall insulation contribute to building sustainability?

Using glass mineral wool cavity wall insulation like the Knauf Insulation DriTherm® Cavity Slabs helps reduce energy consumption by improving thermal efficiency. The materials used are sustainable, containing a high percentage of recycled content, and contribute to a building’s overall environmental performance by minimizing carbon emissions.


Data Sheet - Click Here


Order Value Delivery Charge
Up to £200.00 ex-vat £100.00 ex-vat
£200.00 - £599.95 ex-vat £59.95 ex-vat
Above £599.95 ex-vat Free Delivery


Weekend Delivery
Available upon request


Parcel Rates
Delivery charge may vary depending on quantity and volume of your order.
Pricing will be calculated during checkout.


Local Delivery Charge
Within 35 miles of Postcode S63 9BL - Up to £500.00 ex-vat
Delivery Charge £35.00 ex-vat
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Delivery charges will automatically be calculated within the checkout process.
Orders are only processed for delivery between 8.00am - 5.00pm Monday to Friday excluding bank holidays.
Moffett offload will be used for large bulky deliveries and only when agreed with you.
Please advise of any access issues on ordering.
Delivery is Kerbside only.
In the unlikely event that your delivery is not correct or damaged please notify us immediately and mark any issues on the delivery slip.


    Where We Deliver

    Delivery Areas

    We have a fleet of FORS delivery vehicles all with Moffett mechanical off loads that deliver nationwide. Sometimes we may use 3rd party carriers for smaller orders.


      Product Delivery Times

      The vast majority of our orders are dispatched within 3 working days, this can however be up to 5 working days, please contact us if you require something urgent.
      Speciality items may take up to 5-7 working days.
      We will contact you with in 24/48hrs of your order been placed to confirm delivery times and dates.

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