Background... We live SE of Phoenix in the desert where we get sparse and
infrequent rain. Our soil is typical desert sandy soil.
We have a "ground set" manufactured home which is fully supported on steel
piers that stand on concrete pads. There is a 36" crawlspace underneath
the house. During installation, there was a framework of pressure treated
2x4's constructed around the perimeter of the house, attached to the
house's sill plate at the top, and bolted to a poured concrete perimeter
footer. After the framework was completed, it was covered with pressure-
treated 3/4" plywood, forming a containment barrier between the crawlspace
and the exterior. The last step was to backfill the exterior against the
Our entire yard is covered in a combination of decomposed and 3/4" crushed
granite. There is no grass, and 90% of the landscape plants are cacti and
other desert plants which require almost no watering. Farther away from
the house is a citrus tree, an ash tree, and a desert pine.
This underground construction is common in our area, although there are
also homes where the construction is of concrete block or poured concrete.
Obviously, either of those choices would outlive pressure-treated plywood,
but the price differential was huge, about 8-10K, which we could ill afford
at the time.
I know that if we need to, concrete block construction can replace the
plywood in the future, but I'm wondering if anyone can give an educated
guess as to how long this plywood wall will last.
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