Knauf 85mm DriTherm 32 Cavity Wall Insulation Slab Pack of 5 (2.73m²)
Knauf 85mm 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 flexibility and close-fitting properties of mineral wool insulation.
Each pack contains 5 slabs measuring 1200x455x85mm and provides approximately 2.73m² of coverage. At 85mm thickness, the insulation provides a thermal resistance of 2.65m²K/W and achieves Euroclass A1 reaction-to-fire classification, meaning it is non-combustible.
Key Features & Benefits Knauf 85mm 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: 85mm
- Slab size: 1200x455x85mm
- Pack quantity: 5 slabs
- Coverage: 2.73m² per pack
- Thermal conductivity: 0.032 W/mK
- Thermal resistance: 2.65m²K/W
- Reaction to fire: Euroclass A1 - non-combustible
- Application: External full-fill masonry cavity walls
- Water resistance: Manufactured with a water-repellent additive
- Certification: BBA Agrément certified
- Technology: ECOSE® Technology
- Manufacturer product code: 715830
- EAN / GTIN: 5056376642219
- Packs per pallet: 45
- Designed to friction fit between standard wall ties
- Flexible mineral wool helps accommodate minor imperfections in masonry
- Close-fitting slabs help minimise gaps in the insulation layer
85mm 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 85mm thickness is suitable where the cavity width and required thermal performance have been designed around an 85mm insulation layer. The cavity should always be designed to suit the insulation thickness rather than compressing the slabs 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, providing excellent thermal performance within masonry cavity wall construction.
At 85mm thickness, the slab provides a thermal resistance of 2.65m²K/W.
The final U-value achieved by the external wall will depend on the complete construction, including the inner and outer masonry leaves, block specification, wall ties, finishes and other building materials.
Designed for Full-Fill Masonry Cavity Walls
DriTherm Cavity Slabs are designed to completely fill the specified masonry cavity when installed as part of an approved full-fill cavity wall construction.
Full-fill mineral wool insulation allows a continuous layer of insulation to be installed between the masonry leaves while providing the thermal and moisture-resistance characteristics required for the specified wall system.
Always ensure that cavity width, exposure conditions, wall construction and insulation thickness are suitable for the individual project.
Designed to Fit Between Wall Ties
Each DriTherm slab is 455mm wide, helping it fit between standard vertical wall-tie spacings.
The semi-rigid glass mineral wool is designed to friction fit between the wall ties and adjacent slabs, creating closely butted joints throughout the insulation layer.
Flexible Mineral Wool Helps Reduce Gaps
One of the advantages of glass mineral wool cavity insulation is its ability to adapt to minor irregularities in masonry surfaces.
The fibres allow adjacent slabs to knit closely together and accommodate small imperfections, helping minimise unintended gaps that could otherwise reduce the real-world thermal performance of the wall.
Water-Repellent Cavity Insulation
Knauf DriTherm Cavity Slabs are manufactured with a water-repellent additive, making them suitable for use within approved full-fill masonry cavity wall systems.
The product should still be stored, handled and installed in accordance with Knauf's current instructions and protected against unnecessary weather exposure and contamination during construction.
Suitable for Different Exposure Zones
DriTherm Cavity Slabs are BBA Agrément certified for use within appropriate masonry cavity wall constructions, including projects in demanding exposure conditions where the requirements of the certificate and project specification are satisfied.
Exposure zone, building height, wall construction and local site conditions should always be considered when specifying a cavity wall insulation system.
Euroclass A1 Non-Combustible Insulation
Knauf DriTherm Cavity Slab 32 achieves a Euroclass A1 reaction-to-fire classification under 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 5 - 2.73m² Coverage
Each pack contains 5 individual cavity insulation slabs, each measuring 1200x455x85mm.
The complete pack provides approximately 2.73m² of coverage.
When calculating requirements, 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 within its glass mineral wool insulation products.
The technology gives Knauf glass mineral wool its distinctive natural brown appearance while forming part of the manufacturer's modern mineral wool insulation range.
Long-Lasting Mineral Wool Insulation
DriTherm Cavity Slabs are designed to provide durable thermal performance when correctly installed and protected within the 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
DriTherm Cavity Slabs should be installed as the masonry wall is constructed, with the slabs positioned closely between the wall ties and tightly butted against adjacent pieces of insulation.
Keep joints close and avoid unnecessary gaps. Excess mortar and debris should be kept away from the insulation and cavity during construction.
The insulation should not be compressed into a cavity that is narrower than its specified thickness. Damaged, heavily contaminated or unsuitable insulation should not be installed.
Protect exposed insulation and unfinished cavity walls from adverse weather during construction and always follow Knauf Insulation's current installation guidance, BBA certification and the individual project specification.
Knauf DriTherm Technical Datasheet
For full manufacturer technical information, thermal performance, available thicknesses, certification 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
Within the DriTherm cavity insulation range, the number in the product name relates to its thermal conductivity. DriTherm 32 has a declared thermal conductivity of 0.032 W/mK, providing a higher level of thermal resistance at a given thickness than products with a higher lambda value.
The most appropriate DriTherm grade and thickness should be selected according to the required cavity width, target wall U-value and complete project specification.
Why Choose Knauf 85mm DriTherm 32 Cavity Wall Insulation?
Knauf 85mm 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, 2.65m²K/W thermal resistance and Euroclass A1 non-combustible classification make it a strong choice for thermally efficient external masonry cavity walls.
With 5 slabs per pack covering approximately 2.73m², the 85mm DriTherm 32 slab is ideal for projects where this cavity width and thermal specification meet the requirements of the wall design.
