I don't think I would want copper and arsenic sealed up in a trailer
with me. Building codes don't allow pressure treated wood to be used on
hand rails, for example. There are those who believe that cutting this
stuff should be done with serious protection, and that it should not be
used around food crops.
Daisy
Dr. Gerald N. Johnson, electrical engineer wrote:
>
> CCA is a copper and arsenic compound used to rot proof green colored
> outdoor lumber. The standard retention is 0.40% and the standard lumber
> used for decks is delivered wet from the treatment. It shrinks
> excessively for any nice use. Foundation grade has 0.60% retention, is
> kiln dried after treatment so it doesn't shrink nearly so violently, and
> is guaranteed for 40 years in the ground. Foundation grade plywood comes
> in nominal 5/8 and 3/4 thicknesses, probably 1/32" shy like most
> plywoods (other than marine). And there are 2x6, 2x8, 2x10 and 2x12
> available in foundation grade for use in making wooden foundations walls
> and for use as footer plates. As far as I know the only grade is CD so
> its not ready for a finish floor. Might need an overlay to make a smooth
> surface for vinyl sheet goods or tile. Part of the weight is the
> treatment, part is the use of strong wood like long leaf southern yellow
> pine that is heavy without treatment.
>
> Besides the treated wood, wooden foundations depend a great deal on very
> careful drainage to minimize the water pressure from the soil.
>
> Gerald J.
>
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