03-29-2012, 06:47 AM
I'm a little late to the party here, however one of the main reasons I re-did my first layout was because I used 3/8 plywood and notice a significant "wavyness" to my trackwork after about several months of use and work put into it. So I pulled it all up and used 3/4 ply for the deck instead. It has proven to be much more stable and have been in place for a few years now.