Metal Herringbone Strutting

[JoshRogan]

Just about to install some of these mid-span of my room-in-roof attic trusses (above detached garage) and wanted to know if they only provide lateral (read sideways I think) support to stop the joists wanting to turn over or do they help spread the load across the neighbouring joists in any form?

I imagine solid blocking would maybe transfer more of the vertical load than metal strutting would? as I notice on my truss plans 'solid' blocking is required under the strutting points but for the mid-span just blocking is called for.

Thanks

C.

 

[Deluks]

Neither will really transfer any vertical loading, they are to prevent twist in the timbers, or turning over as you put it.
A binder will spread loading to some extent (or lots of counterbattens, as covered gazillions of times in here), but this must be installed on top of the joists themselves.

Just solid block it all, will be cheaper (oh, you've already bought them )

 

[JoshRogan]

Thanks for that.

I've actually only just purchased enough herringbone for the middle strutting, will solid block the other two points as per TRADA diagram.

Just wondered why solid blocking was specifically stated over any other type - I've read about the disadvantages (shrinkage and stuff) so wonder what the advantage reasoning would be.

Cheers

C.

 

[Deluks]

No idea, maybe the truss components will be in the way of fixing herringbones to top/bottom of joists?