Fixing and buying guide
S/K1501200 KEYSTONE S/K-150 X 1200mm Standard Cavity Wall Lintel
What this product is and who it is for
This is a standard cavity wall lintel manufactured by Keystone. The S/K-150 designation indicates it is a 150mm deep lintel designed specifically for cavity wall construction, where the cavity is typically 50-100mm wide. The 1200mm length makes it suitable for medium-span openings. It is intended for builders, structural engineers, and experienced DIY customers installing windows, doors, or other openings in cavity masonry walls.
- Standard-duty steel lintel for cavity walls
- 150mm depth suitable for typical cavity wall construction
- 1200mm span length for medium openings
- Load-bearing component requiring proper installation
Compatibility and sizing
Before ordering, confirm that your opening width matches the 1200mm length of this lintel. The 150mm depth is designed to work with standard cavity wall construction and should be checked against your wall thickness and cavity width. Ensure the lintel will bear adequately on both inner and outer leaves of the cavity wall, typically requiring a minimum bearing of 150mm on each side. Consult structural drawings or seek professional advice if you are unsure whether this lintel is suitable for your specific load requirements.
- Measure your opening width to confirm 1200mm is appropriate
- Check wall thickness and cavity width compatibility
- Verify bearing requirements on both wall leaves
- Confirm load requirements with structural engineer if necessary
Installation and pre-install checks
Before installation, inspect the lintel for any damage or corrosion. Ensure the opening in the masonry is properly prepared and level. The lintel must be bedded firmly on mortar on both the inner and outer leaves of the cavity wall, with adequate bearing length on each side. Proper support is essential for structural integrity. Allow mortar to cure fully before applying any load above the lintel. If you are unfamiliar with lintel installation, consult a qualified builder or structural engineer to ensure correct placement and support.
- Inspect lintel for damage before installation
- Ensure opening is level and properly prepared
- Bed lintel firmly on mortar on both wall leaves
- Maintain minimum bearing length on each side
- Allow mortar to cure before loading