steel between floor beams

Going to start a 2nd storey reno soon and got a couple of q's for the more experienced among us.
1.. steel beams are being used to run Pozi-joists between. these will sit just above the original gnd floor ceiling joists. Q is . is it ok to just sit these steel beams on HW blocks on top of top plates. Do they have to have some sort of fastening down thru lower wall to top/bottom plate ( all-thread ??)
do I need to weld on steel blocks. Or do I have to run double studs up through top plate to underside of steel beam. Not real keen about cutting top plates. Engineer has specified Dbl and Triple stud supports in lower walls.
2.. New stumps for these super studs ,,, can they just sit straight under bottom plate if no bearer is availble.
3.. I'm assuming blocking will be necessary between bearers and bottom plates ( between joists ) under these super studs Y/N ?

I realise these are q's that the engineer could answer but I dont like to eek every lost drop of advice out of people once they done their part and been paid off.
hope this makes sense to someone

Andrew,
these are all details that should have been on your drawings anyway, so either your draughtsman or engineer have been a bit slack (or both)
1) I would assume some fastening, probably not entire tie down, but firmly bolted at any rate.
2) not sure
3) Yes definitely

Mick

Guess the jobs probably done now? But along the lines of what Mick said ... My dsign was approved by the Engineer but he left off a few fixing details. Not being too experienced with what he should and shouldn't have provided I just fixed as per what I had seen done before and the standards where available. Anyway ... short storey was that the surveyor then made me go back and get them approved.

So yes, I paid the engineer $300 to give me a 2 line fax saying that what I had already done was fine! Things we learn hey??

How did it turn out Andrew

[quote=OBBob;465372]Guess the jobs probably done now? But along the lines of what Mick said ... My dsign was approved by the Engineer but he left off a few fixing details. Not being too experienced with what he should and shouldn't have provided I just fixed as per what I had seen done before and the standards where available. Anyway ... short storey was that the surveyor then made me go back and get them approved.

So yes, I paid the engineer $300 to give me a 2 line fax saying that what I had already done was fine! Things we learn hey??

How did it turn out Andrew[/quote

Bob, See repply under truss storage thread.
I havnt started yet - just going through it in my head. $300 for engineering. Mate I should bl**dy go back and ask for drawings on gold leaf, Try $1000.00 Cough cough choke
Should be well into it in two weeks. loads of preparitory work before hand.
Remove central heating ducting, rig up temp shower, dig holes for plumber etc etc

Andrew as Mick said all those points should have been documented.
The building surveyor or certifier shouldn't [if he has] passed the plans without that type of information.
1. blocking on the top plate is usually the way it's done - seasoned timber so that there's no shrinkage [ & the same or better stress grade as the studs ]
Tie down will depend on the wind load.
2. Yes
3. Yes. once again seasoned timber is best rather than OB.

You pay good money for comp's so I wouldn't be backward in asking questions on items that should have been provided.

yeh its hard to know what should be provided, and I spose most of these questions are givens to an every day builder.
Aus, thanks I'll give him a shot if the council hasnt already. plans are still at council waiting for the permit.

Thanks People