Pressure Treated Lumber Institute

The Pressure Treated Lumber Institute (PTLI) is an organization that sets standards and provides certification for pressure-treated wood. Pressure treatment involves forcing preservatives into wood to protect it from decay, insects, and moisture, making it suitable for outdoor and structural use. PTLI ensures that treated lumber meets safety, quality, and environmental guidelines, helping consumers and builders select reliable, durable products. Their certification assures the treatments are applied properly, enhancing the wood's longevity and performance in various applications, such as decks, fencing, and outdoor structures.