"troubleinstore" wrote in message
...
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


If the concrete is the original top surface, then how have the flag stones been laid
on top of it ? If they've been built up on top of the old surface, then you should
only have to remove the new stuff back to the old surface of the concrete. That's
taking that the old concrete surface didn't produce the same problems of bridging the
existing damp proof course and was well drained originally.


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