What size Catnic lintel do I need?
The length of lintel required is calculated by establishing the total width of the structural opening and adding 150mm (200mm for CXL lintels) end bearing allowance for each end. For example, an 1800mm structural opening will require a 2100mm lintel (2200mm for CXL).
What is the minimum bearing for a Catnic lintel?
150mm
Lintels generally require a nominal minimum end bearing of 150mm at both ends, meaning the total lintel length is the span of the opening plus 300mm. On top of that, there are other things to be aware of during installation to ensure the lintel is correctly supported and able to do the job expected of it.
How do you calculate lintel load?
Measure the size of the open space between the walls where the door/window frame is fitted. Add a minimum of 150mm to each end. For example, for a structural opening or clear span of 1,800mm, the minimum lintel length required will be 1,800 + 150 + 150 = 2,100mm.
How do I know what lintel I need?
You will need to know five things:
- What is the wall construction?
- What is the length of the lintel?
- What is the load to be supported by the lintel?
- What is the load ratio between the inner and outer leaves of the cavity wall?
- How to interpret the load tables.
What thickness lintel do I need?
What size concrete lintel do I need? The lintel should be installed with a minimum end bearing of 150mm, so measure your opening and add at least 300mm. Unlike steel lintels, a concrete lintel is often used in visible areas and painted if required.
Do Catnic lintels need DPC?
It is a National House Building Council (NHBC) requirement to apply a damp proof course (DPC) over each lintel to protect it. Many Catnic lintels feature a Duplex Corrosion Protection coating and a unique profile shape that acts as a built-in DPC.
Does a Catnic lintel need a cavity tray?
The info on this can be a bit confusing, but basically Catnic claim their lintels don’t need a tray whereas others do need them.
What is a Catnic lintel?
The Catnic Thermally Broken Lintel, or TBL, is a type of thermally broken steel lintel for use in masonry cavity wall build-ups. It provides support over structural openings such as doors and windows, while minimising linear thermal bridging heat loss compared to conventional cavity lintels.
What are Catnic lintels used for?
Box lintels are a versatile form of structural support, easily coursed in with standard masonry units in solid external walls, masonry cavity walls, and internal walls. A typical external solid wall is 200 to 215mm wide and comprises a double thickness of standard masonry units (whether bricks or concrete blocks).
What is a Catnic lintel used for?
Corrugated lintels are used in extra light duty scenarios for 75mm and 100mm thick walls, being suitable for nominal domestic loading. For light duty loading/applications, channel lintels provide the necessary support in 100mm internal walls.
What’s the longest Catnic lintel?
Standard lengths are available in increments of 150mm at lengths up to 3000mm, 300mm at lengths from 3000mm – 4800mm (including 4575 but excluding 4500mm).
Do Catnic lintels need weep holes?
Technical requirements NHBC Standards: Where fair faced masonry issupported by lintels: weep holes should be provided at maximum 450mm intervals. Each opening should have at least two weep holes.