The sub-floor is elevated above the soil. Heavy duty ground cloth is followed by 3" of gravel. On the "low" side, two courses of 1" blocks. Then 4" x 6" pressure treated. Followed by 2" x 6" with two coats of Zinnser primer (or bones paint). For a total of 16" to 17" of separation between the soil and the floor. The underside of the floor is also treated.
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