Stay Flexible With 150mm Knauf DriTherm® Cavity Slab 32
Published on
October 17, 2025 at 11:35:26 AM PDT October 17, 2025 at 11:35:26 AM PDTth, October 17, 2025 at 11:35:26 AM PDT
Don’t be constrained by 100mm cavities. Stay flexible with 150mm DriTherm® Cavity Slab 32
Don’t be constrained by 100mm cavities. Stay flexible with 150mm DriTherm® Cavity Slab 32, a full-fill mineral wool solution that adapts to imperfections in the substrate and knits together at the joints, making it easy to install. This reduces the risk of air gaps and ensures better overall performance.
Today’s new homes face unprecedented scrutiny from both regulators and homeowners. Designs must meet a growing list of complex requirements, from thermal and fire safety performance, to reduced environmental impact.
As standards rise, designing with 100mm wall cavities will limit your options, whereas 150mm provides flexibility. In fact, a survey of housebuilders suggests 150mm cavities are becoming the industry norm for new homes, with 41% of participants already having made the switch and just over a quarter considering it.*
* Survey by Professional Builder and Knauf Insulation, October 2023
Don't Be Constrained By 100mm Cavities
Wider cavities allow you achieve the performance you need with products like DriTherm® Cavity Slab 32:
- Easier to install correctly
- Non-combustible, with a Euroclass A1 reaction to fire classification
- Manufactured from glass mineral wool, which has the lowest levels of embodied carbon of any mainstream insulation material
Achieving Real World Performance
DriTherm® Cavity Slab 32 is a full-fill mineral wool solution that doesn't require cavity barriers to meet Approved Document B regulations. This simplifies construction processes, reduces material costs, and streamlines regulatory compliance.
Download our comprehensive installation guide which provides a detailed overview of the correct installation process to achieve real world performance.
Glass Mineral Wool Vs PIR
Using DriTherm® Cavity Slab 32 in a full fill masonry cavity, provides the following benefits:
- Non-combustible A1 Euroclass Reaction to Fire classification
- ECOSE® Technology, our unique bio-based binder
- Moisture resistant for use in all exposure zones
- Faster and more cost effective to install than rigid foam boards
- Adapts to any slight imperfections in the substrate, eliminating any air gaps
- No requirement for retaining discs