I'm building the floor system for a screened in porch.
Rectangular in shape. CMU support walls all around. I'd like to
use a wood floor system with treated 3/4" plywood, then Durock, and
finish it with a tile of some type.. The ledger boards are treated,
of course, but I'm wondering if the 2x joists need to be as well. I
mean, this is really no different than any other room. or is it? The
joists here shouldn't be any more susceptible to attack than the rest
of the house.
In a previous post firstname.lastname@example.org wrote...
If the porch is not subject to moisture then PT joists are probably not
required. However, if it is a small area you might want to consider using
PT material just to be safe. The additional cost will be nominal if the
area is small.
Bob Morrison, PE, SE
R L Morrison Engineering Co
Also, how close are they to the dirt? If you don't have the code
required 18" or whatever it is, then I would play it safe and use
treated. Like Bob says, the cost of treated is minor--why not play it
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