How do you calculate Catnic lintel?
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 I calculate the load on a lintel?
This is the simplest scenario and basically, means that to calculate the load you take the load of the masonry above the lintel within the load triangle. If any additional loads are applied to the masonry within the load triangle or interaction zone you apply them at 100% and 50% respectively and disperse them at 45°.
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.
Do you need a lintel above bifold doors?
Bi-fold doors can cause a headache with lintel selection, as the standard allowed deflection can mean the door won’t operate correctly. To this end, we recommend a heavy-duty or even a rolled steel lintel above a bi-fold door to ensure that there is absolutely no deflection.
What are Catnic lintels 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.
Do cavity lintels need Padstones?
1. The lintel should be bedded on mortar and levelled both along the lintel and across its width. Full bricks, blocks or padstones should be used as bearing areas. All external wall lintels must be installed with a flexible damp proof course or cavity tray.
Can you cut down Catnic lintels?
Can you cut Catnic lintel? While some steel lintel beams can be cut, this is not the case with Catnic products. This is because they feature a reinforced end which if removed will weaken the integrity of the beam. As a result, Catnic advise that their beams are not cut under any circumstances.
What size RSJ for 2.5 m span?
Table 2 – Size of steel beam supporting partition
| Partition load (from Table 1) [kN/m run] | Clear span of beam [m] | Smallest suitable Universal Beam size [mm x mm x kg/m] |
|---|---|---|
| 5 to 7 | up to 2.5 2.5 to 3 3 to 4 over 4 | 127 x 76 x 13 152 x 89 x 16 178 x 102 x 19 see Note 2 |
Do I need building regs for a lintel?
Yes, if the alterations are of a structural nature. The insertion of a beam or lintel which affects the structural stability of the building will also require approval.
What does an RSJ sit on?
It has to be sitting on a strong concrete block to distribute the weight uniformly. Any quote to install an RSJ should include calculations done by a structural engineer.