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My ‘usual’ builder certainly knows about this. He specialises in extensions and the RSJs hold the wall up when he makes a hole.
My builder uses an engineering firm to produce the plans and beams. I am pretty sure the plans have to go to building control but not 100%.
I’m in NI so probably not much use to you though.
Just seen this super useful diagram, thanks so much for knocking it up. Makes understanding a lot easier when inevitably things can get lost in translation. I'll look again with the torch to see if I can see said padstones and if not peel more plaster away.
@tgr @bigshape thanks for explaining this. Do you think you could expect your usual builder to know about these things? If you don't know no worries, you've all be so useful already.