I'm building a windowless plywood tank for my turtle. The dimensions are 8ft x 3ft x 4ft and bought 45 mil EPDM pond liner for the waterproofing. Started to put the liner in today and as I was trying to smooth it out, I noticed the narrow sides were very wrinkled. That's when it hit me. The 4ft that the liner goes up the narrow, 3ft end still wants to be 11ft wide. I don't see any way I could possibly get the narrow sides and corners flush against the wood without cutting the liner and resealing it - which just seems like a disaster waiting to happen. I haven't heard of anyone else mention this as a problem. Am I missing something? If not how did other people handle this on setups that weren't close to being square?
