I am replacing some 1 inch floor boards in a bathroom. The joist are spaced 24" (130 year old home). I would like to replace the floor boards with plywood. What combination of sizes should I use to make up the 1 inch (actually about 1/16 to 1/32 less than 1 inch). Should I use (2) 1/2 inch pieces, (1) 5/8 and (1) 3/8, or (1) 3/4 and (1) 1/4 inch. I will glue and screw the plywood. I am planning on putting cement board (1/4 inch) and ceramic tile across the entire floor.