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My current S scale layout is built using 3/4" MDF subroadbed on 1x4" joists over L-girders. It seems to be working out pretty good so far. MDF cuts like a knife going through butter! Very smooth straight cuts with my circular, jig and table saws. It makes almost as much dust as homosote! When looking for plywood for this current layout I looked at a lot of plywood at a lot of different places. I generally have used 1/2" B-C but the quality of all the plywood I saw reminded me more of CDX plywood. Many, many voids, un-filled knotholes and unbelievable curling and waviness. The MDF cost me $15.89 a sheet and the 1/2" B-C was running around $29 a sheet. I made one strange discovery..........the MDF sheets are 49"x97" rather than 48x96! Go figure! Roger
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