Another thread probably talking myself out of even considering this church. This is a job for a structural engineer, of course.

Googling and searching here the only thing I can find that can span 8m clear (no supports except each end) for a mezzanine floor are floor trusses. And of course there are no indications of what such things cost. I couldn't find information on laminated beams, probably using the wrong search terms.

I'm figuring that to do this, you'd need to run an extremely large beam of some sort along the walls - probably a 290x45 or larger, or steel - stuck on with REALLY big dynabolts, and then use joist hangers off those to put in a mezzanine. I can't see using joist hangers directly onto a stone wall being a particularly safe option - although Grand Designs did it, of course.

This is a really, really horrifically expensive notion, isn't it ...


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