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Calculate linear feet needed for baseboard, crown molding, door casing, and window casing trim. Get accurate material estimates with waste factor included for your trim installation project.
Baseboard: (Perimeter - Door widths) × (1 + Waste%)
Crown: Perimeter × (1 + Waste%)
Door Casing: Doors × (2×Height + Width) × (1 + Waste%)
Window Casing: Windows × 14 ft × (1 + Waste%)
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Trim, also known as molding or millwork, is decorative and functional woodwork installed to cover transitions between surfaces and add architectural detail to a room. It serves both aesthetic and practical purposes by hiding gaps, protecting walls, and enhancing the overall design.
Common trim types include baseboard (floor-to-wall transition), crown molding (ceiling-to-wall transition), door casing (around door frames), and window casing (around window frames).
Measure the length and width of your room in feet. For ceiling trim, also measure the ceiling height.
Room perimeter = 2 × (Length + Width). This gives you the linear feet around the room.
Subtract door widths from baseboard calculations. Add door and window casing measurements separately.
Add 10-15% for miter cuts, mistakes, and future repairs. Professional installers typically use 10%.
| Trim Type | Location | Typical Height/Size | Purpose |
|---|---|---|---|
| Baseboard | Floor/wall junction | 3-7 inches | Protects walls, hides gaps |
| Crown Molding | Ceiling/wall junction | 3-8 inches | Decorative, elegant finish |
| Door Casing | Around door frames | 2-4 inches wide | Frames doorway, hides gaps |
| Window Casing | Around window frames | 2-4 inches wide | Frames window, decorative |
Example: 12×15 ft room, 2 doors
Perimeter = 2×(12+15) = 54 ft
Doors = 2×3 = 6 ft
Baseboard = (54-6)×1.10 = 52.8 ft
Example: 12×15 ft room
Perimeter = 2×(12+15) = 54 ft
Crown = 54×1.10 = 59.4 ft
Baseboard typically ranges from 3 to 7 inches in height. Modern homes often use 5-7 inch baseboards, while traditional or smaller rooms may use 3-5 inches.
Add 10-15% waste for miter cuts, errors, and future repairs. For beginners or complex rooms with many corners, use 15%. Professionals typically calculate 10% waste.
No, baseboard stops at door casings. Door casing is separate trim that frames the doorway. Baseboard typically butts against the door casing on each side.
Most trim is available in 8-foot, 10-foot, 12-foot, and 16-foot lengths. Purchasing longer boards minimizes seams but may be harder to transport and install.
While possible, it's not recommended. Crown molding is designed to be installed at an angle at the ceiling, while baseboard sits flat against the wall. Each has specific profiles for its application.
Divide the L-shape into two rectangles, calculate the perimeter of each, then subtract the shared wall length. Add the two perimeters together and account for doors/windows.
Casing is a specific type of trim used around doors and windows. Trim is the general term for all decorative molding, including baseboard, crown molding, casing, and other millwork.
For visual continuity, it's best to use the same style and size of trim throughout common areas. You can vary trim in different zones (e.g., bedrooms vs. living areas) but maintain consistency within each zone.
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