This is the PCV board that I got from Lowes, smooth on 1 side and textured (shown)
Richard Mynderup said:
Thanks for all the thoughts!! The frame below is the pvc vinyl material (trim material I find at HD) I’m using for the ladder system of my roadbed. I made this frame to keep a hollow bottom below the building for install of lighting, etc.
Richard
Well before you try thicker material why not bore a couple holes (say like 1" or bigger) in the base inside of the station to allow for air movement since the windows are open. Then screw the base to the frame below on the corners.
Only a suggestion