How and where to use guide
KEYSTONE S/K-110 - 1200mm Standard Load Cavity Lintel
Typical applications
The KEYSTONE S/K-110 is commonly used in cavity wall construction for door and window openings in domestic properties and light commercial buildings. It spans openings up to 1200mm wide and is ideal for ground floor and upper floor applications where standard residential loading applies. This lintel is not suitable for heavy concentrated loads, such as steel beams or substantial masonry above, or for openings exceeding 1200mm.
- Domestic window and door openings in cavity walls
- Light commercial buildings with standard masonry loading
- Openings up to 1200mm span
- Applications with UDL not exceeding 16 kN
Installation and positioning
The lintel must be bedded level on a full mortar bed on both the inner and outer leaves. The outer leaf sits on the 102mm outer dimension and the inner leaf on the 100mm inner dimension, maintaining the cavity separation. Ensure adequate bearing length (typically 150mm minimum on each side of the opening) to distribute loads safely. The lintel height of 100mm allows it to sit within standard brick or block courses. Check that the lintel is fully supported along its entire length and that mortar joints are well filled to prevent water ingress at the bearing points.
- Bed lintel on full mortar bed on both leaves
- Provide minimum 150mm bearing length each side
- Keep lintel level during installation
- Fill all mortar joints completely to prevent water penetration
- Allow mortar to cure fully before loading
Load capacity and limitations
The KEYSTONE S/K-110 has a total UDL capacity of 16 kN and is designed for standard residential loading only. Do not use this lintel where concentrated point loads, heavy structural elements, or loads exceeding the stated UDL are anticipated. For openings wider than 1200mm or heavier loading conditions, a heavier duty lintel must be specified. Always verify that the actual loading from the structure above does not exceed the lintel's capacity before installation.
- Maximum UDL: 16 kN
- Maximum span: 1200mm
- Not suitable for concentrated heavy loads
- Not suitable for openings exceeding 1200mm
- Consult structural engineer if loading is uncertain
Maintenance and durability
Once installed and the mortar has cured, the KEYSTONE S/K-110 requires minimal maintenance. Inspect the mortar bed and joints periodically, particularly after severe weather, to ensure no water ingress or mortar deterioration has occurred. Keep the cavity clear of debris and ensure that cavity trays and weep holes are functioning correctly to manage any moisture. The lintel itself is durable and will not require replacement under normal conditions if installed correctly and the cavity is properly maintained.
- Inspect mortar joints annually for cracks or deterioration
- Ensure cavity trays and weep holes remain clear and functional
- Keep cavity free from debris and blockages
- Monitor for signs of water ingress around the lintel