Knauf 150mm DriTherm 32 Cavity Wall Insulation Slab Pack of 4 (2.18m²)
Knauf 150mm 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 retaining the flexible, close-fitting installation characteristics of mineral wool insulation.
Each pack contains 4 slabs measuring 1200x455x150mm and provides approximately 2.18m² of coverage. At 150mm thickness, the insulation delivers a thermal resistance of 4.65m²K/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 masonry surfaces and minimise unintended gaps within the insulation layer.
Key Features & Benefits - Knauf 150mm 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: 150mm
- Slab size: 1200x455x150mm
- Pack quantity: 4 slabs
- Coverage: approximately 2.18m² per pack
- Thermal conductivity: 0.032 W/mK
- Thermal resistance: 4.65m²K/W
- Reaction to fire: Euroclass A1 - non-combustible
- Application: External full-fill masonry cavity walls
- Water resistance: Manufactured with a water-repellent additive
- BBA Agrément: 95/3212
- Technology: ECOSE® Technology
- Manufacturer product code: 580216
- EAN / GTIN: 5012061973976
- Packs per pallet: 30
- Designed to friction fit between wall ties
- Flexible mineral wool helps adapt to minor irregularities in masonry
- Closely fitting slabs help minimise air gaps within the insulation layer
- High-performance 0.032 W/mK cavity wall insulation
150mm Cavity Wall Insulation
Knauf DriTherm Cavity Slab 32 is designed for suitable external masonry cavity walls where full-fill mineral wool insulation forms part of the specified wall construction.
The 150mm thickness is particularly useful for modern cavity wall designs requiring a deeper insulation layer and high levels of thermal resistance.
The cavity should always be designed to accommodate the specified 150mm insulation thickness rather than compressing the slab into a narrower space.
High Thermal Performance - 0.032 W/mK
DriTherm Cavity Slab 32 has a declared thermal conductivity of 0.032 W/mK, the best thermal conductivity within Knauf Insulation's current DriTherm range.
At 150mm thickness, the slab provides a thermal resistance of 4.65m²K/W, making it particularly suitable for cavity wall constructions where strong thermal performance is required.
The final U-value of the completed wall will depend on the complete construction, including the inner and outer masonry leaves, block specification, wall ties, finishes and other construction materials.
Designed for Full-Fill Masonry Cavity Walls
Knauf DriTherm Cavity Slabs are designed for use as full-fill insulation within suitable external masonry cavity walls.
When correctly installed, the mineral wool forms a continuous insulation layer between the inner and outer masonry leaves, helping reduce heat loss through the external wall construction.
The correct DriTherm thickness should always be selected according to the cavity width, required thermal performance, exposure conditions and individual project specification.
Designed to Fit Between Wall Ties
Each DriTherm slab is manufactured at 455mm wide to suit standard vertical wall-tie spacings.
The semi-rigid mineral wool friction fits between the wall ties and allows neighbouring slabs to be closely butted together.
Knauf states that the friction-fit design means there is no need for ancillary retaining discs or jointing tape when installed in accordance with the approved system.
Flexible Mineral Wool Helps Reduce Gaps
Glass mineral wool has the flexibility to adapt to minor irregularities in masonry surfaces and surrounding construction.
The fibres allow neighbouring slabs to knit closely together, helping minimise unwanted gaps that could otherwise reduce the thermal performance of the insulation layer.
Water-Repellent Cavity Wall Insulation
Knauf DriTherm Cavity Slabs are manufactured with a water-repellent additive to help resist moisture ingress within suitable cavity wall systems.
The insulation should still be correctly stored, handled and protected during construction. Avoid installing heavily contaminated or damaged slabs and protect unfinished wall sections against unnecessary exposure to adverse weather.
BBA Certified for Cavity Wall Applications
DriTherm Cavity Slabs hold BBA Agrément certification for use within suitable full-fill masonry cavity wall constructions.
Knauf states that DriTherm Cavity Slabs are approved for use in all exposure zones, including very severe areas, when the construction and installation comply with the relevant BBA certificate requirements.
Building height, exposure conditions, masonry specification, cavity width and other project-specific requirements should always be checked before installation.
Ideal for New Builds & Extensions
Knauf 150mm DriTherm 32 is particularly suitable for new-build homes, house extensions and other masonry projects where a deeper cavity and high-performance insulation layer have been specified.
Typical applications include:
- New-build houses
- House extensions
- External masonry cavity walls
- Residential developments
- Suitable non-domestic masonry buildings
- Projects requiring high-performance full-fill cavity wall insulation
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 4 - 2.18m² Coverage
Each pack contains 4 individual DriTherm cavity insulation slabs, with each slab measuring 1200x455x150mm.
The complete pack provides approximately 2.18m² of insulation coverage.
When calculating the number of packs 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 throughout its glass mineral wool insulation range.
This technology gives Knauf glass mineral wool its distinctive natural brown appearance and forms part of the manufacturer's current 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 close-fitting mineral wool helps maintain a continuous insulation layer while adapting to small irregularities within the surrounding masonry.
Installation Advice
Install DriTherm Cavity Slabs as the masonry wall is constructed, positioning the insulation closely between the wall ties and tightly butting adjacent slabs together.
Avoid unnecessary gaps and keep the cavity and insulation free from excessive mortar droppings and other construction debris.
The 150mm slabs should not be compressed into a cavity narrower than their specified thickness.
Protect exposed insulation and unfinished cavity walls from adverse weather during construction and always follow Knauf Insulation's current installation guidance, BBA certification and individual project specification.
Knauf DriTherm Cavity Slab Technical Datasheet
For complete manufacturer information covering thermal performance, available thicknesses, BBA certification, product applications and installation guidance, refer to the official Knauf Insulation DriTherm Cavity Slabs technical datasheet:
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.
At the same thickness, a lower thermal conductivity provides greater thermal resistance than an insulation product with a higher lambda value.
The appropriate DriTherm grade and thickness should therefore be selected according to the required cavity width, target wall U-value and complete construction specification.
Why Choose Knauf 150mm DriTherm 32 Cavity Wall Insulation Slab?
Knauf 150mm DriTherm 32 Cavity Wall Insulation Slab combines excellent thermal performance with the practical installation benefits of semi-rigid glass mineral wool. Its 0.032 W/mK thermal conductivity, 4.65m²K/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 4 slabs per pack covering approximately 2.18m², the 150mm DriTherm 32 slab provides a high-performance full-fill cavity insulation solution where a 150mm insulation thickness meets the requirements of the wall design.
