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Grandpopwalt, pressure treated lumber is the double edge sword, Its made from southern yellow pine which has a tendency to warp, bow twist etc. It's wonderful for structural framing on a deck or for the required sill plate between the concrete foundation and floor joist on a house. This is why a lot of the finish millwork, screen doors and moldings are made from Spruce, Fir,Pine or SPF it has a tighter grain than the PTL. SPf however unless it is treated wityh a wood preservative it wood rot within a year or so. I would use Redwood or Trex(composite) you can find a link in Olddads FYI post. Hope I've been helpful[?]
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