Hanging floor joists of steal

24 Jan 2014
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United Kingdom
Im converting a loft and need to hang joists of an steal beam totally below the support so that the bottom of the joist hangs 215mm below the bottom of the beam. The reason for this is one of the beams is sitting atop of another and would lose a lot of hight if I can't hang below the support.

I planed on using the Simpson JHA450/50 Joist hanger and they say to hang below the support you require timber bolted into the span of the beam as normal but an additional timber bolted to the top of the beam for the hanger to wrap over (45mm). The problem I have is the beam I am using us UB 356X171X45 and the max hight of the hanger I can find is 475mm so I will not have enough lengh in the legs of the hanger for the wrap over above beam. Is there anyway to support the joist hanger without the requirment for a top timber beam and wrap over. Would maximum nailing into the timber in the web of the beam be stong enough and within regulations? Could I possible just wrap over the timber in the span of the beam and that is enough support?
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