ill be redoing my storage shed with firestone rubber pondliner, cheaper than buying felt and gaurenteed 100% waterproof, well at least its holding 2000 gallons of water back in my fishpond.
Steveo3002 There were some creases where it had been folded and the temperature when I was laying it was not ideal but warmed the worst ones with the heat gun and it came ok.
If you can get hold of Butyl rubber pond liner then that stuff lasts a LONG time.
I sell water tanks and always specify 1mm Butyl liner over the much cheaper EPDM liners.
Our water tank was second hand when we bought it 25 years ago. Liners still good....
hows my pic look ...i was thinking instead of a batton on the outermost edge fix one underneath so its a drip rail , then glue the rubber around with maybe a few stapples
or please suggest if you have a better idea , i didnt really want nail /screw holes holding a batton on