A Wedge refers to a small, tapered insert-often made of wood or metal-used in frame joinery to reinforce mitered or butt joints. In picture framing, it is commonly associated with v-nails, biscuits, or dovetail keys that are driven or pressed into pre-cut slots at the corners of a frame to ensure structural stability.

Function in Joinery

Provides mechanical strength by locking two moulding rails tightly together.
Often used in conjunction with adhesive or glue for added reinforcement.
Can be inserted from the back of the frame (as with V-nails) or through a routed slot (as with spline or dovetail keys).

Types of Wedges

V-Nails / Underpinner Wedges - Metal wedges driven into the back of a frame using an underpinner.
Thumbnail or Biscuit Wedges - Oval or key-shaped inserts placed into routed slots on the moulding.
Dovetail Keys - Decorative or functional wood splines visible from the side or face of the corner.

Related Terms

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