Steve Horvath posted:Dave is correct. You would have much better results using rigid foam board. I use occasionally when needed 2" thick 4 X 8 sheets. I found them to be available at Loews and H D . The 2" thick version can be used by itself and forms a great base to work from. I use Woodland Scenic s "Foam Tack Glue #1544 to hold the track in place. The glue dries quickly and clear.
Steve and Dave,
We're considering using foam board instead of plywood and homasote. You say "the 2" thick version can be used by itself and forms a great base..." Am I understanding that, with joists placed every 16" apart, I can just use one layer 2" foam instead of plywood and homasote - meaning one layer of 2" stiff foam board is sturdy enough to support my track, all trains, even a Big Boy sitting on a siding for days or weeks, all buildings and terrain, etc? Thanks.
