"Andrew Mawson" wrote in message
...
Shortly after the Christmas pud has settled down I'll be starting work on
my
new garage. The flank wall is 'half brick' with pillars ie approx 100mm
thick. Due to its length (7 metre) it needs an expansion joint. I
understand
that the conventional wisdom is to tie the two bit of wall together with
normal cavity wall ties 'along the length' of the wall, with one side
wrapped in a bit of dpc to let it slide.

My builders used a metal strip that screwed to the existing wall. That had a
matching piece, with protruding ties, that was built into the new wall.
Apparently, the two parts have some movement relative to each other, but
they still hold the walls together against gross movements.

Colin Bignell