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Durable, long-lasting, and built to withstand the elements, pressure treated wood is a smart choice for outdoor construction projects. We offer a wide selection of pressure treated lumber ideal for decks, fences, garden beds, retaining walls, and other exterior applications that require protection against moisture, rot, and insects. Treated with preservative solutions under high pressure, this wood is designed to resist decay, fungal growth, and pest damage, making it perfect for Canada’s diverse and often harsh climates. Available in various sizes and profiles, it provides a cost-effective and reliable option for structural and landscaping needs. As a proudly Canadian company, Windsor Plywood specializes in hard-to-find, high-quality building materials with expert advice and personalized service. Whether you're building a backyard retreat or tackling a large outdoor project, pressure treated wood offers the strength and resilience to ensure your work stands the test of time.
Frequently Asked Questions
What types of pressure-treated lumber does Windsor Plywood carry?
Windsor Plywood carries pressure-treated SPF and pine lumber in standard framing dimensions including 2x4, 2x6, 4x4, 4x6, and larger post sizes, as well as decking boards and plywood. Treatment ratings range from above-ground use to ground contact and permanent wood foundation applications, each suited to different levels of moisture and soil exposure.
What do the treatment retention levels mean on pressure-treated lumber?
Treatment retention levels indicate the amount of preservative per cubic foot of wood and determine where the lumber can safely be used. UC2 is for interior damp use. UC3B is for above-ground exterior exposure. UC4A and UC4B are for ground contact applications like fence posts and deck footings. Always match the retention level to the application.
Is modern pressure-treated lumber safe for vegetable gardens and children's play structures?
Yes. Since 2004, residential pressure-treated lumber in Canada has used copper-based preservatives that replaced the older arsenic-containing CCA treatment. Current treatments are considered safe for vegetable garden beds and play structures when the lumber is fully dry. Let newly treated lumber dry for several weeks before placing it in a vegetable bed.
What fasteners should I use with pressure-treated lumber?
Use hot-dipped galvanized, stainless steel, or fasteners specifically rated for use with treated lumber. The copper in modern preservatives reacts with standard zinc-plated and electroplated fasteners, causing rapid corrosion. Hardware including joist hangers and post bases must also be rated for use with treated lumber.
Can pressure-treated lumber be painted or stained?
Yes, but wait until the lumber is fully dry before applying any finish. New pressure-treated lumber often has residual moisture from the treatment process that prevents paint and stain from adhering properly. Test dryness by sprinkling water on the surface — if the water beads, it is still too wet. Once dry, apply a quality exterior primer and paint, or a penetrating exterior stain.