How and where to use guide
URSA 35 Cavity Wall Batt 3.69mtr sq (0.035W/mK) 100mm
Typical applications
URSA 35 Cavity Wall Batt is intended for use in new external masonry cavity walls where thermal insulation is required. It performs effectively in both full cavity fill (where the cavity is completely filled with insulation) and partial fill (where insulation is installed with a residual air gap). The product is suitable for standard cavity widths found in modern UK masonry construction.
- New build external masonry cavity walls
- Full cavity fill installations
- Partial cavity fill with residual air gap
- Standard cavity widths with vertical wall tie spacing
Installation and fitting
The 455mm width is specifically designed to fit between standard vertical wall tie spacings, enabling friction fitting directly into the cavity without the need for additional fixings or extensive cutting. The flexible nature of the batt allows it to be gently compressed and inserted between the ties as the outer leaf is built. This design minimises on-site waste and reduces installation time compared to products requiring cutting to size.
- Insert batts between vertical wall ties as outer leaf is constructed
- Friction fit without additional fixings required
- Minimal cutting needed due to 455mm width matching standard tie spacing
- Ensure batts are fully inserted and seated properly in the cavity
- Work systematically from bottom to top of wall
Performance and limitations
With a thermal conductivity of 0.035W/mK, URSA 35 provides effective thermal insulation performance for cavity wall applications. The water-repellent additive resists moisture ingress, protecting the insulation and the wall structure. As a non-combustible material with BBA approval, it meets UK building regulations for fire safety. However, this product is designed specifically for cavity walls and should not be used in other applications. Proper installation is essential to maintain the integrity of the cavity and ensure the water-repellent properties function effectively.
- Thermal conductivity: 0.035W/mK
- Non-combustible with BBA approval
- Water-repellent additive provides moisture protection
- For cavity wall use only
- Installation quality affects overall thermal and moisture performance
On-site handling and storage
Store URSA 35 Cavity Wall Batt in dry conditions on site before installation. The product should be protected from weather and kept in its packaging until ready to use. Handle with appropriate personal protective equipment including gloves and a dust mask, as with all mineral wool products. Ensure the product is not compressed or damaged during storage, as this may affect its ability to friction fit correctly in the cavity.
- Store in dry conditions before installation
- Keep in original packaging until use
- Protect from rain and moisture during storage
- Wear gloves and dust mask when handling
- Avoid compression or damage that may affect friction fit