Joinery

Joinery

Definition: Joinery refers to the techniques and methods used to connect frame corners or other components together, creating a stable, precise, and visually appealing structure. In picture framing, joinery is critical for ensuring that the frame maintains square corners, durability, and aesthetic integrity over time.

Common Types of Joinery

• Miter Joint: A joint where two frame rails are cut at complementary angles (typically 45°) to form a corner. Common in wood and metal frames.
• Dovetail Joint: A mechanically interlocking joint often reinforced with a dovetail key or biscuit to strengthen a mitered corner.
• Lap Joint: A joint in which one frame rail overlaps another, often used for larger or heavier frames requiring additional strength.
• Spline Joint: A method in which a thin piece of wood or other material (a spline) is inserted into slots cut across the miter to increase stability.
• Tapped L-Corners: Used primarily in metal frames, where the corners are mechanically fastened with screws or L-shaped fittings.

Key Considerations

• Precision Cutting: Accurate measurement and cutting of rails are essential to prevent gaps or misalignment at corners.
• Reinforcement: Use of biscuits, dovetail keys, or splines can strengthen joints and prevent separation over time.
• Material Suitability: Different joinery techniques work better with certain materials-wood, MDF, metal, or composite mouldings.
• Adhesives and Fasteners: Proper use of glue, nails, or screws ensures long-lasting, secure joints.
• Finish Integration: Ensure that joinery does not interfere with decorative finishes, inlays, or embossed designs.

Best Practices

• Always check that frame corners are perfectly square before gluing or fastening.
• Use clamps or jigs to maintain alignment while adhesive sets.
• Consider reinforcing larger frames or frames that will bear heavier artwork with additional joinery supports.
• For archival or conservation framing, ensure joinery methods do not stress or damage artwork.

Related Terms

• Spline Joint
• Lap Joint Frames
• Frame Chop
• Lap Joint