In message
,
Andy Dingley writes
On 17 Feb, 16:55, wrote:

Re helibars, ss threaded rod is way cheaper.

Helibar are £5 each, which is cheaper than threaded stainless rod,
unless you go down to 8mm. I'd also be concerned about grip on the
much smaller thread.

I've just bought a metre of m12 stainless studding for a fiver.


A much simpler way to reintegrate the wall would be to inject epoxy
into the cracks.

That's going to put the faces of the crack into tension though, so
won't that simply peel the epoxy off the crack? The point of the bars
is to couple the forces in along a long shear line.

Have you totally rejected underpinning?

regards

--
Tim Lamb