"Jason Carlton" wrote in message
...
Have any of you ever built an outdoor pond? I'm curious whether I
really need to use 45 mil pond liner, or can I save $$$ and go with 20
mil for about 30% less?

I'm in NC, if it matters.

I know I risk starting a war here but you don't have to use pond liner. 45
mil EPDM roofing material is the same thing. Make sure it is not treated
for mildew etc. but I used this in a pond for ~ 12 years with no ill
effects. If there is a commercial roofing company near you you can probably
buy left over material for a very good price.