Knauf 50mm DriTherm 37 Cavity Wall Insulation Slab Pack of 12 (6.55m²)
Knauf 50mm DriTherm 37 Cavity Wall Insulation Slab is a water-repellent glass mineral wool insulation designed specifically for external full-fill masonry cavity walls. With a declared thermal conductivity of 0.037 W/mK, DriTherm Cavity Slab 37 provides reliable thermal performance together with the flexible, close-fitting installation characteristics of mineral wool insulation.
Each pack contains 12 slabs measuring 1200x455x50mm and provides approximately 6.55m² of coverage. At 50mm thickness, the insulation provides a thermal resistance of 1.35m²K/W and achieves Euroclass A1 reaction-to-fire classification, meaning it is non-combustible.
The glass mineral wool slabs are designed to friction fit between wall ties and knit closely together, helping accommodate slight irregularities in masonry surfaces and minimise unwanted gaps within the insulation layer.
Key Features & Benefits - Knauf 50mm DriTherm 37 Cavity Wall Insulation Slab
- Manufacturer: Knauf Insulation
- Range: DriTherm® Cavity Slab 37
- Product type: Cavity wall insulation slab
- Material: Glass Mineral Wool
- Thickness: 50mm
- Slab size: 1200x455x50mm
- Pack quantity: 12 slabs
- Coverage: approximately 6.55m² per pack
- Thermal conductivity: 0.037 W/mK
- Thermal resistance: 1.35m²K/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: Certified for suitable cavity wall applications
- Technology: ECOSE® Technology
- Manufacturer product code: 316650
- EAN / GTIN: 5012061890488
- Packs per pallet: 30
- Pallet coverage: 196.56m²
- Designed to friction fit between wall ties
- Flexible mineral wool adapts to slight imperfections in masonry
- Closely fitting slabs help minimise air gaps within the insulation layer
- Suitable for new-build, extension and other approved masonry cavity wall projects
50mm Cavity Wall Insulation
Knauf DriTherm Cavity Slab 37 is designed for use within suitable external masonry cavity walls where full-fill mineral wool insulation forms part of the specified wall construction.
The 50mm thickness is suitable for wall constructions designed around a 50mm insulation layer. The cavity should always be suitable for the selected insulation thickness and project specification rather than compressing the insulation into a narrower space.
Thermal Performance - 0.037 W/mK
DriTherm Cavity Slab 37 has a declared thermal conductivity of 0.037 W/mK.
At 50mm thickness, the product provides a thermal resistance of 1.35m²K/W.
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 building materials.
Designed for Full-Fill Masonry Cavity Walls
DriTherm Cavity Slab 37 is specifically designed as a full-fill insulation solution for 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 insulation 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 measures 455mm wide, helping it fit efficiently between standard vertical wall-tie spacings.
The mineral wool is designed to friction fit between the wall ties, allowing neighbouring slabs to be closely butted together.
Knauf states that the friction-fit design means retaining discs and jointing tape are not required for the insulation when installed in accordance with the approved system.
Flexible Mineral Wool Helps Minimise Gaps
Glass mineral wool has the flexibility to adapt to slight imperfections in masonry surfaces and surrounding construction.
The fibres allow neighbouring slabs to knit closely together, helping minimise unintended air gaps that could otherwise reduce the thermal performance of the insulation layer.
Water-Repellent Cavity Wall Insulation
Knauf DriTherm Cavity Slab 37 is manufactured with a water-repellent additive to help resist moisture ingress within approved masonry cavity wall constructions.
The insulation should still be stored, handled and protected correctly during construction. Avoid installing damaged or heavily contaminated material and protect exposed insulation and unfinished masonry from adverse weather.
BBA Certified Cavity Wall Insulation
DriTherm Cavity Slabs hold BBA Agrément certification for use within suitable masonry cavity wall constructions.
Knauf states that the slabs are approved for use in all exposure zones, including very severe areas, when the wall design and installation comply with the requirements of the relevant BBA certificate.
Building height, exposure conditions, cavity width, masonry specification and other project-specific requirements should always be checked before installation.
Ideal for New Builds & Extensions
Knauf 50mm DriTherm 37 is suitable for masonry cavity wall projects where a 50mm full-fill mineral wool insulation layer meets the required construction specification.
Typical applications include:
- House extensions
- New-build properties
- External masonry cavity walls
- Residential developments
- Suitable non-domestic masonry construction
- Full-fill cavity wall insulation projects
Euroclass A1 Non-Combustible Insulation
Knauf DriTherm Cavity Slab 37 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 12 - 6.55m² Coverage
Each pack contains 12 individual DriTherm cavity insulation slabs, with each slab measuring 1200x455x50mm.
The complete pack provides approximately 6.55m² 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 37 is manufactured using ECOSE® Technology, Knauf Insulation's plant-based binder technology used within 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 mineral wool insulation system.
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 unnecessary gaps and keep the cavity and insulation clear of excessive mortar droppings and other construction debris.
The 50mm slabs should not be compressed into a cavity narrower than their specified thickness.
Protect exposed insulation and unfinished cavity walls from adverse weather and always follow Knauf Insulation's current installation instructions, BBA certification and the individual project specification.
Knauf DriTherm Cavity Slab 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 37 Thermal Performance
The number in the DriTherm 37 product name relates to its declared thermal conductivity of 0.037 W/mK.
Different DriTherm grades and thicknesses are available, so the appropriate product should be selected according to the cavity width, target wall U-value and complete construction specification.
Why Choose Knauf 50mm DriTherm 37 Cavity Wall Insulation Slab?
Knauf 50mm DriTherm 37 Cavity Wall Insulation Slab provides a practical full-fill mineral wool solution for suitable external masonry cavity walls. Its 0.037 W/mK thermal conductivity, 1.35m²K/W thermal resistance, water-repellent construction and Euroclass A1 non-combustible classification provide clearly defined performance for cavity wall projects.
With 12 slabs per pack covering approximately 6.55m², the 50mm DriTherm 37 pack provides useful coverage for extensions, new builds and other masonry projects where a 50mm insulation thickness meets the wall specification.
