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Add the perfect finishing touch to any room with our extensive selection of quality mouldings. Whether you're upgrading baseboards, enhancing cabinet details, or framing windows and doors, we carry a wide variety of styles to suit any design—from classic to contemporary. Choose from finely crafted options in oak, fir, hemlock, maple, MDF, and more. Our moulding collection includes crown mouldings, panel mouldings, corner trim, casings, and baseboards—ideal for DIYers, builders, and designers alike. If you're looking for high-end finishing trim and wainscoting, our S4S lumber selections include the most popular wood species such as oak, walnut, maple, and more. Every piece is sourced with care for quality, consistency, and long-lasting appeal. As a proudly Canadian company with locally owned stores, we focus on personalized service to help bring your vision to life. Whether you're completing a new build or refreshing a space, Windsor Plywood has the right moulding for every project. Visit your local store for expert guidance, custom options, and hard-to-find profiles you won’t see anywhere else.
Frequently Asked Questions
What is flat stock moulding and where is it used?
Flat stock, also called S4S (surfaced four sides), is smooth-planed lumber in standard widths used as trim, casing, panelling components, shelf edging, and general finishing work. It has no decorative profile. The clean, flat face is the design and it is particularly popular in craftsman-style and contemporary interiors.
What wood species are available in flat stock at Windsor Plywood?
Common species include pine, poplar, oak, maple, and MDF in painted grades. Species selection depends on the application. Poplar and pine take paint well and are cost-effective; oak and maple are used where the wood grain will be visible. MDF flat stock is the smoothest option for painted trim.
What sizes does flat stock typically come in?
Flat stock is available in standard nominal widths from 2 inches up to 12 inches and beyond, in various thicknesses. The actual finished dimensions are slightly under the nominal size after planing. Windsor Plywood can confirm available dimensions and lengths for specific project requirements.
Can flat stock be used for craftsman-style casing and trim?
Flat stock is one of the defining materials of craftsman-style trim. Craftsman casing typically uses wide flat stock with a back band detail, and craftsman baseboard uses flat stock with a cap moulding. The result is clean, architectural, and easy to execute compared to heavily profiled traditional trim.
Is flat stock suitable for shelving?
Yes. Wider S4S flat stock in species like maple, oak, or pine is a practical shelving material, particularly for built-in applications and shop shelving. It should be appropriately sized for the span and load. Unsupported spans longer than 24 to 32 inches in 3/4-inch material will sag under significant weight.