Impressive, but an extra expense and unnecessary in a domestic context.

As the beam will be asymmetrically loaded with respect to the shear centre, there will obviously be a bending moment and therefore torsion induced in the I-beam, which needs to be allowed for on longer spans.
But those stiffeners would do little if anything to reduce the torsion-effect. Theoretically they will reduce deflection of the plate in the xx axis, but for a 6mm plate, 100mm welds every 300mm would be adequate.
Whoah there. You're not being paid by the technical word. :rolleyes:

The weight is on the front edge. Bits of metal stop it bending. (y)
 
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An update guys:

I have taken one of the RSJs back to weld an underplate to it and the steels guy said stiffeners will stick out on my wall so I can’t use that. I contacted the BCO prior to confirm they are happy with the underplate, the BCO said okay, but either 6mm plate with stiffeners or 10mm without, so I had to go for the 10mm without stiffeners.

Question: why would the stiffener stick out?
 
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Builder doesn’t agree, with 10mm plate, says it will increase brick joints massively and not practical, even the 6mm. So I’m going for RSJ for inner leaf and IG C lintel for outer leaf, gauge is 3.2mm and 225mm high. Both not bolted.
 
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Lol, it's almost like someone else has had this problem and developed an off the shelf product to solve it.
 
Thanks guys. You can tell I had fun being bounced around by the BCO, builder and the steel fabricator.
 

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