6 Mil Vapour barrier - used in house construction - over inside of stud wall.
I cut it into 2' wide strips and let it hang half onto th floor, built the cove on it and covered it with sand and placed the liner on that - it will never wash out.
You can put the foam on the wall or on the floor too, but most i've talked to say it's a dealer scam - pretty expensive for what it is and will 1/8" really give you any insulation value?
Some say it makes the floor ultra smooth, Mine's ultra smooth just with sand - it all depends on the care taken during install.
if you got the money and really want to part with it, go ahead, but it's definitely not necessary - besides, the money it costs for happy wall liner, happy cove and happy bottom will buy you your innitial solar heat panels or a ton of pooltoys for the kids - money well spent.
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