Knauf 100mm DriTherm 32 Cavity Wall Insulation Slab Pack of 6 (3.28m²)
Knauf 100mm DriTherm 32 Cavity Wall Insulation Slab is a high-performance glass mineral wool insulation designed specifically for external full-fill masonry cavity walls. With a declared thermal conductivity of just 0.032 W/mK, DriTherm Cavity Slab 32 provides excellent thermal performance while offering the close-fitting and flexible installation characteristics of mineral wool insulation.
Each pack contains 6 slabs measuring 1200x455x100mm and provides approximately 3.28m² of coverage. At 100mm thickness, the insulation provides a thermal resistance of 3.10m²K/W and achieves Euroclass A1 reaction-to-fire classification, meaning it is non-combustible.
The semi-rigid glass mineral wool slabs are designed to friction fit between wall ties and knit closely together, helping accommodate minor imperfections in the masonry and minimise unintended gaps within the insulation layer.
Key Features & Benefits - Knauf 100mm DriTherm 32 Cavity Wall Insulation Slab
- Manufacturer: Knauf Insulation
- Range: DriTherm® Cavity Slab 32
- Product type: Cavity wall insulation slab
- Material: Glass Mineral Wool
- Thickness: 100mm
- Slab size: 1200x455x100mm
- Pack quantity: 6 slabs
- Coverage: approximately 3.28m² per pack
- Thermal conductivity: 0.032 W/mK
- Thermal resistance: 3.10m²K/W
- Reaction to fire: Euroclass A1 - non-combustible
- Application: External full-fill masonry cavity walls
- Water resistance: Manufactured with a water-repellent additive
- Technology: ECOSE® Technology
- Manufacturer product code: 715829
- EAN / GTIN: 5056376642202
- Packs per pallet: 30
- Designed to friction fit closely between wall ties
- Flexible mineral wool helps accommodate minor irregularities in masonry
- Closely butted slabs help minimise gaps within the insulation layer
- High-performance 0.032 W/mK cavity wall insulation
100mm Cavity Wall Insulation
Knauf DriTherm Cavity Slab 32 is designed for use within suitable external masonry cavity walls where full-fill mineral wool insulation forms part of the specified wall construction.
The 100mm thickness is suitable for projects where the cavity width and thermal specification have been designed around a 100mm insulation layer.
The cavity should always be designed to suit the selected insulation thickness rather than compressing a thicker mineral wool slab into a narrower cavity.
High Thermal Performance - 0.032 W/mK
DriTherm Cavity Slab 32 has a declared thermal conductivity of 0.032 W/mK.
At 100mm thickness, the product provides a thermal resistance of 3.10m²K/W, helping achieve strong thermal performance within external masonry wall constructions.
The final U-value of the completed wall depends on the entire construction build-up, including the block type, external masonry leaf, wall ties, finishes and other construction materials.
Designed for Full-Fill Masonry Cavity Walls
Knauf DriTherm Cavity Slabs are designed to fill the specified cavity within suitable external masonry wall constructions.
Using mineral wool as a full-fill insulation layer helps provide continuous thermal insulation between the inner and outer masonry leaves when installed correctly and in accordance with the approved wall specification.
Always check cavity width, exposure conditions, building design and project requirements before selecting the appropriate DriTherm thickness.
Designed to Fit Between Wall Ties
Each slab is manufactured at 455mm wide, allowing it to fit efficiently between standard vertical wall-tie spacings.
The semi-rigid mineral wool is designed to friction fit around the wall ties while allowing adjacent slabs to be closely butted together.
Flexible Mineral Wool Helps Reduce Insulation Gaps
Glass mineral wool can adapt to minor imperfections in masonry surfaces and surrounding construction.
The flexible fibres allow adjacent pieces to knit closely together, helping minimise air gaps that could otherwise reduce the real-world thermal performance of the cavity insulation layer.
Water-Repellent Cavity Insulation
Knauf DriTherm Cavity Slabs are manufactured with a water-repellent additive for use within approved masonry cavity wall systems.
The insulation should nevertheless be correctly stored, handled and protected during construction. Avoid installing damaged or heavily contaminated slabs and protect unfinished wall sections from adverse weather.
Suitable for External Masonry Walls
DriTherm Cavity Slab 32 is specifically designed for external masonry cavity wall construction rather than general-purpose framed wall insulation.
Typical applications include new-build homes, house extensions and other suitable masonry construction projects where a full-fill mineral wool cavity insulation system is specified.
Euroclass A1 Non-Combustible Insulation
Knauf DriTherm Cavity Slab 32 achieves a Euroclass A1 reaction-to-fire classification in accordance with EN 13501-1.
A1 is the highest Euroclass reaction-to-fire classification and means the glass mineral wool insulation is classified as non-combustible.
Pack of 6 - 3.28m² Coverage
Each pack contains 6 individual DriTherm cavity insulation slabs, with each slab measuring 1200x455x100mm.
The complete pack provides approximately 3.28m² of insulation coverage.
When calculating how many packs are required, use the actual insulated wall area and allow appropriately for openings, detailing, cutting and project-specific wastage.
ECOSE® Technology
Knauf DriTherm Cavity Slab 32 is manufactured using ECOSE® Technology, Knauf Insulation's plant-based binder technology used across its glass mineral wool insulation range.
The technology gives Knauf glass mineral wool its distinctive natural brown appearance and forms part of the manufacturer's current mineral wool insulation system.
Durable Cavity Wall Insulation
DriTherm Cavity Slabs are designed to provide long-term thermal performance when correctly installed and protected within the masonry cavity wall construction.
The glass mineral wool is rot proof and does not provide a source of sustenance for vermin or encourage the growth of fungi, mould or bacteria.
Installation Advice
Install DriTherm Cavity Slabs as the masonry wall is constructed, positioning the insulation closely between wall ties and tightly butting adjoining slabs together.
Avoid leaving unnecessary gaps within the insulation layer and keep the cavity clear of excessive mortar droppings and other construction debris.
The slabs should not be compressed into a cavity narrower than their specified 100mm thickness.
Protect exposed insulation and unfinished cavity walls from adverse weather during construction and always follow Knauf Insulation's current installation instructions and the individual project specification.
Knauf DriTherm Cavity Slab Technical Datasheet
For complete manufacturer information, including thermal performance, available DriTherm thicknesses, product applications, certification and installation guidance, refer to the official Knauf Insulation technical information:
View Knauf DriTherm Cavity Slabs Technical Datasheet
DriTherm 32 Thermal Performance
The number in the DriTherm 32 product name relates to its declared thermal conductivity of 0.032 W/mK.
A lower thermal conductivity means greater thermal resistance at the same insulation thickness compared with a product with a higher lambda value.
The correct DriTherm grade and thickness should always be selected according to the required cavity width, target wall U-value and complete project specification.
Why Choose Knauf 100mm DriTherm 32 Cavity Wall Insulation Slab?
Knauf 100mm DriTherm 32 Cavity Wall Insulation Slab combines high thermal performance with the practical installation benefits of semi-rigid glass mineral wool. Its 0.032 W/mK thermal conductivity, 3.10m²K/W thermal resistance, water-repellent construction and Euroclass A1 non-combustible classification make it a strong choice for thermally efficient external masonry cavity walls.
With 6 slabs per pack covering approximately 3.28m², the 100mm DriTherm 32 slab provides a practical cavity wall insulation solution where a 100mm insulation thickness meets the requirements of the wall design.
