I think the building framer had good intentions, when
using treated plywood for framing base plates as shown in the picture
above. Certainly something like this should be used, if the structural
engineer or architect is calling out for it on the building plans.
This type of framing makes sense, but don't forget that plywood
delaminates or starts to fall apart once it becomes moist. If the soil
was to remain moist for long periods of time, this moisture will absorb
into the concrete like a sponge and work its way up to the bottom of the
treated plywood and could eventually damage the-based framing.
This seems like a pretty good idea, but I don't recommend using
something like this, because I don't know for sure, what kind of
problems will arise in the future. As a home framing contractor,
remember to never take it upon yourself to make a decision about
something that isn't on the blueprints. You should never installed
something like this, if it isn't called out for bite the engineer or
architect.
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