How and where to use guide
S/K-90 2100MM KEYSTONE CAVITY WALL LINTEL
Typical applications
This 2100mm lintel is commonly used in residential and light commercial cavity wall construction to support masonry above window and door openings. The 90mm depth makes it suitable for standard cavity wall thicknesses. It can be used in both external and internal leaf applications, depending on structural requirements and building design.
- Window and door openings in cavity wall construction
- Residential new build and renovation projects
- Light commercial buildings with cavity wall construction
- Openings up to approximately 2100mm span
Installation and positioning
The lintel must be installed level and bedded firmly on mortar on both supporting walls. Ensure adequate bearing length on each side of the opening—typically a minimum of 150mm on each support is recommended, though always follow structural engineer specifications for your project. The lintel should be positioned at the correct height relative to the opening and checked for level before the masonry above is laid. Temporary support may be required during installation until the mortar has cured and the structure above has been built.
- Bed lintel on fresh mortar, ensuring full contact with both supporting walls
- Check for level in both directions before proceeding with masonry above
- Provide minimum bearing length as specified by structural engineer
- Allow mortar to cure fully before removing temporary support
- Ensure lintel is not subjected to point loads during installation
Limitations and maintenance
This lintel is designed for cavity wall applications and must not be used in solid wall construction without appropriate modification. It should not be cut or modified on site. Inspect regularly for signs of settlement, cracking in masonry above, or water ingress, particularly around the lintel bearing points. Ensure cavity trays and damp-proof courses are correctly installed around the lintel to prevent moisture penetration into the cavity.
- Do not use in solid wall construction without structural advice
- Do not cut or modify the lintel on site
- Ensure cavity trays are installed to prevent water ingress
- Monitor for settlement cracks in masonry above the opening
- Keep cavity clear of debris to maintain ventilation
On-site handling and safety
Lintels are heavy components and require appropriate lifting equipment and trained personnel. Ensure the lintel is transported and stored safely on site, protected from damage. Do not drop or impact the lintel, as this may cause hidden damage that affects structural performance. Always follow your site safety procedures and use appropriate personal protective equipment when handling and installing.
- Use proper lifting equipment—do not manually lift without assistance
- Store lintel on level, stable ground away from site traffic
- Protect from weather and site damage during storage
- Wear appropriate PPE during handling and installation
- Ensure adequate temporary support is in place during construction