sm_jamieson wrote:
My structural engineers plans involved a timber infill into an old
tapered flange RSJ.
I cut the timber infill to be quite a good fit into the shape, but
after tightening up, there is a small
gap (2mm) between the timber infill and the RSJ.
Is there any glue / substance that sets fairly incompressible, that I
could inject into the gap
so the load is not purely on the bolt holes ?
Come to think of it though, new timber always shrinks, so a timber
infill that is initially wedged
tight would probably loosen anyway, so maybe I'm worrying about
nothing.
Simon.

For what reason is this "timber infill" being fitted into the RSJ - is it to
fix floor or ceiling joists too, or just to box in the RSJ?

If it's for a joist/rafter, then the usual method (in my day) was simply to
place the thing inside and resting on the bottom web and use a Hilti
cartridge gun to fix the thing (they were never cut to shape and never moved
after a few Hilti nails had been used,

If it's to box the RSJ in without any load bearing, simply cut the thing
slightly longer than the space between the webs, and using a bloody great
hammer, just bash it in, and fix the covering to it - I used to use the odd
Hilti nail in the centre of the timber on long runs 'just to make sure' and
never had one fail (with or without the Hilti nail.

If it's for any other reason, please do tell.

Cash