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Treated wood or Not? jam6444 03-18-2007
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Posted by on March 18, 2007, 8:32 pm
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.


Posted by Bob Morrison on March 19, 2007, 11:24 am
In a previous post jam6444@yahoo.com wrote...
> 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.
>

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
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by marson on March 19, 2007, 7:00 pm
> In a previous post jam6...@yahoo.com wrote...
>
> > 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.
>
> 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
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com

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
safe?


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