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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.
Frequently Asked Questions
What is MicroPro Sienna and what does Windsor Plywood carry?
MicroPro Sienna is a premium pressure-treated lumber product treated with a micronized copper preservative that gives the wood a warm brown tone rather than the green colour of traditional treated lumber. Windsor Plywood carries MicroPro Sienna in dimensional framing sizes and decking profiles for outdoor structural and above-grade applications.
What makes MicroPro Sienna different from standard pressure-treated lumber?
MicroPro Sienna uses micronized copper technology where copper particles are ground to a microscopic size and suspended in the treatment solution. This provides deeper and more consistent penetration into the wood fibre and results in the warm brown appearance, a significant aesthetic advantage for visible deck framing and structural elements.
Is MicroPro Sienna safe for vegetable gardens and children's play structures?
Yes. MicroPro Sienna uses a copper-based preservative without the arsenic compounds found in older CCA-treated lumber. It is considered safe for vegetable garden beds and play structures when lumber is fully dried before use.
What fasteners should I use with MicroPro Sienna?
Use hot-dipped galvanized, stainless steel, or fasteners specifically rated for use with copper-treated lumber. The copper in MicroPro Sienna reacts with standard zinc-plated and electroplated fasteners, causing rapid corrosion. Joist hangers, post bases, and all structural connectors must also be rated for use with copper-treated lumber.
Can MicroPro Sienna be stained or painted?
Yes. Once the lumber is fully dried after treatment, MicroPro Sienna accepts exterior stains and paints normally. The warm brown base tone blends more naturally with exterior wood stains than the green of conventional treated lumber, making it a better base for semi-transparent stain applications on visible deck surfaces.