Knauf Insulation DriTherm Cavity Slab 32 1200 x 455 x 150mm

Insulate external full-fill masonry cavity walls with Knauf Insulation DriTherm Cavity Slab 32, supplied in a 1200 x 455 x 150mm size. This high-performance glass mineral wool slab offers a thermal conductivity of 0.032 W/m.K, delivering low heat transmission for energy-efficient wall constructions.

Manufactured with a water-repellent additive to resist moisture ingress, the slab is engineered to adapt to slight imperfections in the substrate and knit together at joints. This eliminates air gaps and preserves thermal performance for the lifetime of the building. The slab friction-fits securely between wall ties without needing ancillary products such as retaining discs or jointing tape, providing a full-fill solution that does not require cavity barriers.

DriTherm Cavity Slab 32 holds a BBA Agrément certificate for use in all exposure zones, including very severe environmental areas. Non-combustible with a Euroclass A1 fire rating, it holds a CCPI Verification Mark and is manufactured using Knauf Insulation's unique bio-based binder, ECOSE Technology.

• 1200 x 455 x 150mm slab – sized to friction-fit between standard wall ties easily
• 0.032 W/m.K thermal conductivity – delivers low thermal transmission for cavity walls
• Water-repellent additive – resists moisture ingress across all exposure zones
• Knits together at joints – adapts to substrate imperfections to eliminate thermal air gaps
• No ancillary fixings needed – friction-fits without retaining discs, tapes, or cavity barriers
• Euroclass A1 non-combustible – ensures maximum fire safety with ECOSE Technology binder
• BBA certified and CCPI verified – approved for use in severe exposure zones

Delivery (UK mainland only)

 

Next Day: £5, or FREE over £40

- Order by 9pm Mon-Thu: next working day

- Order Fri to 5pm Sun: Monday

- Order after 5pm Sun: Tuesday

 

Pre-12pm: £10

- Same cut-offs as Next Day above

 

Saturday & Sunday: £10, or £5 over £40, or FREE over £75

- Saturday: order by 6pm Fri

- Sunday: order by 4pm Sat

 

Heavy items (over 30kg)

- Mon-Fri only. Order by 6pm and allow up to two working days

- Order after 6pm Thu: arrives after the weekend

 

Supplier items

- Sent directly by the supplier, so timings vary. Lead times appear on the product page in working days (Mon-Fri)

 

More about delivery 

Next Business Day Collection (eligible items)

- Order by 9pm Mon-Thu: collect next day

- Order after 9pm Thu to 5pm Sun: collect Monday

- Heavy items (over 30kg): allow up to two working days

 

Opening hours

- Weekdays vary by branch: open 6:30am-7am, close 6pm-8pm

- Saturday: 7am-6pm

- Sunday: 9am-4pm

 

Check your local store's hours and that it's open before visiting. Please wait for our text or email before collecting.

 

Holding your order
We'll hold it for 14 days, then automatically refund your original payment method.