Sorry took so long to get back to you all, life got a little crazy past couple of weeks. First off thanks for taking the time to point me in the right direction, this information is much appreciated. The pond doesn't need to be perfectly sealed, but I would like to get it as close as I can. I did managed to get my hands on some old bridge planks that will need to be cut to fit. My question is how much of a gap will I need for swelling? Is 1/4 inch enough or should I leave more?
