Which joint is commonly used for shelves or picture frames due to a recess along the edge?

Which joint is commonly used for shelves or picture frames due to a recess along the edge?

• A. Rabbet joint
• B. Dado joint
• C. Mortise and tenon
• D. Lap joint

Answer: (A)

A rabbet joint uses a recess along the edge to accept the edge of the adjoining piece, letting the parts sit flush and square. This makes it ideal for shelves, where a back edge or end of the shelf fits into the cut-out along the side piece, giving a clean, strong corner and hiding end grain. It’s also common in picture frames, where a shallow groove on the inner edge holds the artwork and backing so the frame face remains flat against the wall. The other joints don’t rely on that edge recess: a dado is a groove across the piece to accept a shelf, mortise and tenon is a traditional interlock at corners, and a lap joint simply overlaps one piece over another without an edge recess.

A rabbet joint uses a recess along the edge to accept the edge of the adjoining piece, letting the parts sit flush and square. This makes it ideal for shelves, where a back edge or end of the shelf fits into the cut-out along the side piece, giving a clean, strong corner and hiding end grain. It’s also common in picture frames, where a shallow groove on the inner edge holds the artwork and backing so the frame face remains flat against the wall. The other joints don’t rely on that edge recess: a dado is a groove across the piece to accept a shelf, mortise and tenon is a traditional interlock at corners, and a lap joint simply overlaps one piece over another without an edge recess.