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Question:
I am building a 20'x30' addition with a crawlspace onto my concrete block
house. I have a possible source for used pressure treated lumber (several
20' 6x6 beams, lots of 2x8s and some 2x4s and 2x12s too). Would this be good
to use for frame construction/floor joists/rafters, etc? Would I be better
off doing some sort of post and beam design with the 6x6s? I also have an
old block building on my property, and I wanted to know if I should use this
instead for free material to build the addition. How difficult would it be
for me to tear it down myself and prepare the blocks for the new
construction? Is the labor on block construction more expensive than frame
construction?
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Answer: I
would first check with your local building inspector to see if there are any
issues using pressure treated lumber in framing your home (particularly older PT
lumber). Because of the preservatives in pressure treated wood, particularly
pressure treated wood older than 2004, the EPA banned the use of CCA (Chromated
Copper Arsenate) pressure treated lumber in home construction.
The new pressure
treated wood products use a copper based chemical known as Alkaline Copper
Quaternary (ACQ).
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ACQ is less harmful
to the environment however care needs to be used in what type of nails/fasteners
you use with it. Galvanized or stainless steel nails / fasteners are required.
If your PT lumber is newer and allowed to be used in your home's construction
use these types of fasteners.
Note that the
American Wood-Preservers Association (AWPA) has approved certain types of
pressure treated lumber for enclosed / interior framing applications. However,
for enclosed structural framing purposes, the pressure treated lumber must be
dried after treatment to a moisture level of no more than 19% before the
building is enclosed.
Again, check with
your local building inspector on determining specifically what type of treated
lumber you can use in your enclosed framing.
Even if you get the
all clear from your local building inspector, I still have my reservations about
the use of pressure treated lumber in enclosed framing applications. I am
concerned that either through an out-gassing or leaching process of the lumber,
you may be exposing your family to chemicals that may one day be deemed unsafe.
My recommendation would be to limit pressure treated lumber to outdoor
applications.
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Regarding using
old cement blocks, I would suggest that you will find it labor intensive,
and thus expensive, to breakdown the old wall, clean up the blocks
and reinstall them in a new foundation wall.
My
recommendation is to bite the bullet and use new material on your addition
project. In the end, you will save time and money, and not risk exposing
your family to any environmental concerns.
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