I used a foam product called "great stuff" I think is the name, any way be
sure not to get it in the water, it expands and forms a water tight seal.
worked great for me.

Kym


"Black Knight" wrote in message
...
I plan on putting several cources of flagstone in and around my pond,
the question that I have is , should I cement in the first cource with
type 1-a concrete or not? I was planning on doing this for the rest of
the layers but I'm not sure about the rest?
Any advice out there?