Timber in steel web.

Have just installed my steel (UC's) at the weekend.

(Up through the house with the aid of 4 friends, 1 length of chain and some adult sized nappies...)

Now, the timber that gets bolted into the web (for the joist hangers).. Does it have to be a specific type/grade of timber??
Or just whatever you can get to fit?
Needs to be approx 7" by 4" (to fit into 8" x 8" UC)

May be a daft question, but having never done this before....

Thanks in advance..

why 4 inch. What are your levels.

This is what I'm getting at, or am I completely off target??

The finished floor level is roughly the bottom edge of the steel.

depending on the length and size of your joists. easier option is to bolt a 2" timber to the steel and notch the bottom of your joists. A 40mm x 12mm notch, in my opinion, would have no detrimental effect on your floor.

Sorry in advance if I'm being plain old thick...... but...

How can I notch joists on to the steel when my finished floor level is (roughly) the underside of the steel??

Joist are to be 150x50 covering 5.8m span (3m lengths bolted in the middle, resting on load-bearing wall)

Thanks for taking the time Ryme64, much appreciated.

Jacko74 said:

Now, the timber that gets bolted into the web (for the joist hangers).. Does it have to be a specific type/grade of timber??
Or just whatever you can get to fit?
Needs to be approx 7" by 4" (to fit into 8" x 8" UC)

Click to expand...

I'd suggest going for the same grade of timber as you are using for your joists, i.e. C16 or C24. That way you'll get straight, knot-free stock to work with.

BTW is there any reason why you need to hang the joists below the RSJs? I'd have thought it would have made more sense (and been a lot stiffer/stronger) to set the RSJs in lower and either notch the ends of the timber joists top (and possibly bottom) to fit the RSJs or even lower and simply sit the joists atop the RSJs. Hangers are normally specified as requiring full nailing to achieve maximum strength. With only 8 or 10 nails to fix the top of the hanger to the timber deadman (in the RSJ) how can that be achieved?

//www.diynot.com/forums/building/fitting-joists-to-rsj-is-there-a-hanger.300035/

You would need to double up the joist in the web, or pack it out just where the bolts will be

View media item 40292I put my pads in as low as I could get them without disturbing the existing ceiling joists.

Since which the building control officer (brilliant bloke) has been round. He took one look at the pads and said... "Could of just put a plate in, that would of got them lower"
In a nutshell he explained that the plans (which I figured I would have to follow to the letter) where just to get permission to go ahead and start.

My plans stated that we needed a steel stair trimmer.. and they didnt explain what to do with the joists that werent supported in the middle by a load bearing wall (6x2 spanning nearly 6m... Bounce!!)He took one look at the plans, got a pencil out and started drawing on the plans what to do instead..... "Do away with the steel trimmer...just put 3 bolted joists that way..3 that way... and 3 that way.."
Saved us a few pennies no mistake... (especially when your brother in law works for Covers and you can get wood on the cheap )