construction and industrial plywood and be of a grade that is manufactured with a solid face and back .plywood shall be installed with the highest-grade veneer side up .plywood shall be pressure -treated with a preservative chemical and process such as alkaline copper quaternary (ACQ)that prevents decay and damage by insects .preservative treatments shall utilize no epa-listed hazardous chemicals .the concentration of preservative chemcials shall be equal to or greater than required for an above ground level application .treated plywood will be certified for preservative penetration and retention by a third -party inspection agecy .pressure -preservative treated plywood shall have a moisture content at or below 15 percent