john wrote:

"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 ?

Hmmm,
Considered a good ventilation? Even using powered fan.