Find Your Store
MicroPro Sienna is a premium brand of pressure-treated wood that combines durability, environmental responsibility, and aesthetic appeal—making it a top choice for outdoor projects like decks, fences, landscaping, and freshwater docks. Treated with Micronized Copper Azole (MCA) using advanced MicroPro® technology, MicroPro Sienna offers long-term protection against fungal decay and termite damage. This innovative process is certified by the Canadian Standards Association (CSA) and is suitable for use above ground, in ground contact, and in freshwater applications. One of MicroPro Sienna's standout features is its warm, natural brown tone, achieved through micronized iron oxide pigments added during treatment. As a proudly Canadian retailer, Windsor Plywood offers a wide selection of MicroPro Sienna products, backed by expert advice and personalized service. Choose MicroPro Sienna for your next project and enjoy a blend of beauty, performance, and environmental responsibility.
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.