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Smooth, stable, and highly versatile, MDF (Medium Density Fibreboard) is a go-to engineered wood product for a wide range of interior building and design projects. We carry high-quality MDF panels and mouldings ideal for cabinetry, shelving, furniture, wall panelling, and detailed trim work. Made from finely ground wood fibres bonded under heat and pressure, MDF offers a uniform surface that’s perfect for painting, veneering, or laminating. It machines cleanly without splintering, holds edges well, and is ideal for precision cutting, making it especially popular for decorative mouldings and custom millwork. As a proudly Canadian company, Windsor Plywood provides trusted building materials and expert advice to help you complete projects with confidence. Whether you're crafting a built-in unit or upgrading interior details, MDF delivers reliable performance and a smooth, professional finish every time.
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.