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That was put up in a hurry with no planning. Yep I admit it!

The area I'm trying to cover is about 1.5m x 1m. If I starting again I may aswell lower the ceiling to 2.3m which is about 10cm below the steel beams. I could put 3x2" CLS timber spanning wall to wall below the steels (avoiding them). This way do I still need to fix the timber to the steels...

M10/M12 bolts? Ok if I were to redo I may aswell lower the ceiling even further to below the steel beams (parallel but underneath) overall ceiling height 2.3m. Basically span a 3x2" from load bearing wall to load bearing wall. So this way could I just use 2 x timber to masonry joist hangers (...

Ok if I were to redo I may aswell lower the ceiling even further to below the steel beams (parallel but underneath) overall ceiling height 2.3m. Basically span a 3x2" from load bearing wall to load bearing wall. So this way could I just use 2 x timber to masonry joist hangers ( one either end)...

So something like this would be the solution

What's your point? Why is my point that 'it's better to vertically hang timber than drill through steel beams' so controversial? It's COMMON SENSE

Well the advice I got was to 1) drill into steel beams (no I don't want a 50kg steel beam buckling and falling down), 2) redo plasterboard (fair enough I will do), 3) add rigidity to the frame (which I will do by adding vertical drop downs). So no I know I didn't do a good job - but half the...

You sure that I can get away without using the M12 holes and just use the 5mm holes with sheradized nails (i.e. structurally sound and able to be signed off by building control?) Would be a lot easier if the case

I plan to add a subframe for the whole floor so the steel beams won't be visible. Yes I know that the pink fireboard will effectively be a waste of time but hey if it gives me extra time to get out why not. It's not the fire test but the reduction in structural strength that will happen if I...

Thanks. I did screw up (lol) with other joist hangers and just used basic wood screws. BUT these were supplementary joist hangers because the 22mm chipboard spans over the noggins (held up by the joist hanger) and instead goes over the actual joist.

multi truss hangers are more useful when you're working in a confined area and simply cannot take anymore than bare minimum floorboard up. With multi truss hangers there's usually a 5mm hole (for sheradized 3mm nail) and M12 hole. Do you have to use both to be structurally sound?

Structural loading calcs for the steel beam require the beam be unholed. Even with a large safety factor (e.g. failure at 10x loading or whatever) it's not worth risking it.

The pink fireboard cladding is attached to 3"x2" noggins which is hammered between the webs of the steel beam and held in by compression so is not mechanically fixed (not bolted not screwed) to the RSJ. I was told this method is approved. Exactly as in this youtube video; . And yes I will...

Yes I am inexperienced. Most of my experience is with labouring/cementing/basic carpentry/push fit plumbing and end electrical connections. I have a full time job and do this part time. The 7"x 3" timber is 47mm wide x 145mm high (abouts). So a M12 x 75 will go through the joist widthways and...

This is a bolt - how can I use a bolt on CLS timber? Drill through the whole 3" of the timber then attach the nut from the other side?

The timber is dangling on steel banding, so it's not rigid: Answer: Ok I will add ceiling support 3x2" CLS timber going from the nearest joist (which is not vertically above) down to the wood. Press upwards on the plasterboard in random places. If it moves upwards. Answer: I tested and it...

No need to be rude. I don't like leaving pics of my place as attachments in a random website so I use filelinks - filelinks expire attachments are there forever

2 sides are steel RSJ so I CANNOT attach the 3x2" CLS timber into those steel RSJs (drilling into steel RSJ/steel beams isn't good). The ONLY way to support these horizontal 3"x2" CLS timber is by using vertical 3"x2" dropping down from ceiling.

Ok I'll replace the screws with plasterboard screws

So you're saying that it's structurally acceptable for me to use two 'Type 240 Multi Truss Hanger 47mm' (attached to joist with 'twisted 3.75mm x 30mm nails') on 7"x3" CLS timber with no M12 fixings? Structurally acceptable defined as no problems whatsoever and able to be signed off by...