Try a flexible tile cement instead.

"Nigel M" wrote in message
...
A few years ago I installed a WC on a ceramic tiled floor, and bedded it
in a sharp sand & cement mix of about 1:1. Since then it has cracked out
twice, so each time I have weakened the mix. It's just done it again, so
I guess I still used too strong a mix last time.

Any suggestions?


--
Nigel Mercier