[Default] On Mon, 13 Jun 2011 15:46:24 +0100, a certain chimpanzee,
"mark" , randomly hit the keyboard and
wrote:

So can anyone tell me a typical application for each grade of lintel?

It's to do with the loads on the lintel. The catalogues usually give a
safe working load (SWL). Wall loads are about 4.5kN/m^2, floors (in
dwellings) are about 2.0-2.25kN/m^2, roofs are between 1.5-2.5kN/m^2.
Multiply by the areas bearing onto the lintel, add a bit more to be on
the safe side, and you have you SWL.
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