Christian McArdle wrote:

the reason for the trough is that water can run straight into the the
drain.


You can sometimes get away with filling the trough with gravel if the
drainage is good. Although it sort of bridges the DPC, the water wants to go
down into the well drained trough and might not reach the house wall to
cause problems.

Christian.



I should have, but failed to mention that the flagstones are laid upon
the original concrete yard. I do not know how deep the concrete is so I
will have to get the drill out and do a few pilot holes
--
troubleinstore
www.tuppencechange.co.uk