"Pat" wrote in message
...
On May 20, 7:06 pm, "john"
wrote:

You could also lay down plastic and put pea-stone over it to hold it
down. Again, simple and tech.

I thought about that too, but I figure the gas will eventually seep through
the sides and out of the plastic , no ? Do you mean putting the pea-stones
around the outer circumfernece of the plastic only ?