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Pressure treated plywood I've bought has warped badly. If it was secured to a stable and flat surface, that may work. I'm assuming there would never be a time when the felt panel would be left outdoors, exposed to rain.
Cement board would handle the elements but you may want to install a thin sheet of foam under the felt. Something like what is used for laminate flooring might work.
Cement board would handle the elements but you may want to install a thin sheet of foam under the felt. Something like what is used for laminate flooring might work.
