3-1/4″ X 14′ Primed MDF Casing Profile 366

Add a clean, classic finishing touch to your doorways and windows with the 3-1/4″ X 14′ Primed MDF Casing – Profile 366. This popular Colonial-style casing profile delivers a timeless look that coordinates beautifully with painted walls, baseboards, and other interior trim throughout your home.

Constructed from durable medium-density fiberboard (MDF), Profile 366 casing offers a smooth, consistent surface that is factory-primed and ready for paint straight out of the box. MDF construction eliminates the natural grain irregularities found in solid wood, giving you a flawless painted finish every time. It cuts and installs just like wood — making it a favorite choice for contractors, remodelers, and DIYers alike.

At 3-1/4 inches wide and 14 feet long, this casing provides excellent coverage around standard interior doorframes with minimal seams. Its classic profile complements Craftsman, Colonial, Traditional, and Farmhouse interior styles. Whether you’re replacing worn casing, updating builder-grade trim, or finishing a new construction project, Profile 366 delivers a professional result at an everyday low price.

Available at Builders Surplus in Louisville and Florence, KY — proudly serving homeowners, contractors, and remodelers in the Louisville, Florence, and Cincinnati metro areas.

Features & Benefits

• Profile: 366 Colonial casing for doors and windows
• Dimensions: 3-1/4 in. wide x 14 ft. long
• Material: Primed MDF (medium-density fiberboard)
• Surface: Factory-primed and smooth — paint-ready
• Installation: Cuts and installs like wood; compatible with standard miter and coping cuts
• Ideal for: Interior door casing, window casing, and decorative wall trim
• Style: Classic Colonial profile — coordinates with Profile 356 and other MDF trim lines