Notching Wood joists to parallels flange Channel

[Warrentdo]

I want to sit my wooden joist (C24) inside a PFC. Or do I need to fix a wooden block and use joist hangers?

I have a 150x75 PFC that has an inside ledge of 69mm (although there is a 7.6mm rad). I have 47x150 wooden joist that I intend to sit on this internal face.

Data on the NHBC site is a little vague - Solid timber joists - Where connected to steel beams, solid timber joists should: - be deep enough to be notched.

Very useful. Does anyone know if 69mm is enough to sit 47x200 on?

 

Regards,

 

Warren.

Edited December 2, 2022 by Warrentdo

[George]

That's a very short bearing length - minimum of 90mm for an end bearing. 

 

(With SE calculation it could be shown to be OK but if there was a knot or something you risk the timber failing anyway.)

 

It's usually easier to go for a bolted timber between the flanges of the PFC, with joist hangers attached to that.

 

With direct bearing the joists you'd still need to put in noggins so you don't save any timber. 

[Temp]

+1

We filled in both sides of a UB then used joist hangers with long tails that went over the top and down the other side. Nailed in both sides.