Fixing and buying guide
S/K1503000 KEYSTONE S/K-150 X 3000mm Standard Cavity Wall Lintel
What this product is and who it's for
This is a standard cavity wall lintel manufactured by Keystone. The S/K-150 designation indicates it is a 150mm deep lintel, making it suitable for typical cavity wall thicknesses. The 3000mm length provides a single-piece solution for wider openings. It is intended for builders, structural engineers, and experienced DIY installers working on masonry cavity wall projects where openings need structural support.
- Standard-duty steel lintel for cavity walls
- 150mm depth suits standard cavity wall construction
- 3000mm length for larger openings or multiple smaller openings
- Load-bearing component requiring proper installation
Compatibility and sizing
Before purchasing, confirm the opening width and wall construction type. This 3000mm lintel can be cut to length on site if your opening is smaller, though cutting should be done by a competent person. Ensure your cavity width and wall build-up are compatible with a 150mm deep lintel. Check building regulations requirements for your specific application, as lintel selection depends on span, load, and wall configuration. If your opening exceeds 3000mm, you may need multiple lintels or a longer product.
- Measure opening width to confirm 3000mm length is suitable
- Verify cavity wall thickness is compatible with 150mm depth
- Check structural requirements and building regulations for your project
- Confirm load-bearing capacity meets your application needs
Pre-installation checks and preparation
Inspect the lintel on delivery for any damage, rust, or deformation. Store it flat and dry on site. Before fixing, ensure the opening is properly prepared with level, clean bearing surfaces on both sides. The lintel must be fully supported on the inner and outer leaves of the cavity wall, typically with a minimum bearing of 150mm on each side. Do not rely on cavity ties or insulation for support. Ensure adequate mortar bed preparation and that the lintel sits level before building up above it.
- Check for damage or rust on arrival
- Store flat and protected from weather
- Prepare level bearing surfaces on both wall leaves
- Allow minimum 150mm bearing on each side of opening
- Use full mortar bed for even support