Treated Lumber

Build strong, long-lasting outdoor projects with durable treated lumber. Specially pressure-treated to resist rot, decay, and insect damage, this lumber is ideal for decks, fences, landscaping, and other exterior structures exposed to the elements. We carry a wide range of sizes and dimensions to suit everything from structural framing to finishing details, ensuring stability and performance in Canada’s diverse climates. Whether you're building a new deck, replacing fence posts, or tackling a custom backyard project, treated lumber provides the strength and reliability you need. As a proudly Canadian company with locally owned stores, Windsor Plywood offers hard-to-find building materials and expert advice to help you get the job done right. Visit your local store to explore our selection of treated lumber and start planning your next outdoor project with confidence.