This timber has been pressure treated for critical structural (CS) applications, such as posts for post frame buildings, decks, porches, pavilions, pergolas, and gazebos. Many municipal and state building codes require this critical structural treatment when posts in a structural application are put into the ground. Critical structural treatment significantly out performs wood treated to ground contact end use. This timber can be completely buried in the ground or submerged in fresh water. AC2® brand treated wood products use MicroPro? technology, which is a revolutionary way to pressure treat wood for decks, fences, landscaping, and general construction uses. MicroPro? technology offers many benefits including significantly improved corrosion performance. MicroPro? /AC2® technology is the first treated wood process to be certified under the Scientific Certification Systems Environmentally Preferable Product (EPP) program based on life cycle assessment. MicroPro? /AC2® pressure treated wood products are protected from termites and fungal decay and are backed by a Koppers Performance Chemicals Residential and Agricultural limited warranty program (see warranty for details).