Wood chemically treated to resist rot and insects, required where wood contacts the ground or moisture.
Pressure treated lumber is wood that has been impregnated with chemical preservatives under pressure to protect against decay, insects, and moisture. It is required by code for wood in contact with or near ground, concrete, or masonry. Modern preservative treatments use copper-based compounds (ACQ, CA) that are safer than older arsenic-based (CCA) treatments.
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