Red Seal Cabinetmaker Practice Exam 2026 – All-in-One Guide for Exam Success!

The joint that is strengthened by using a biscuit joiner is the butt joint. A biscuit joiner is a specialized tool used to cut a small, oval-shaped slot into both pieces of wood being joined. When a biscuit—typically made of compressed wood—is inserted into these slots and glued, it helps align the pieces and adds strength to the connection.

Butt joints, where two pieces of wood are simply butted together at their ends, can be relatively weak, especially under stress or weight. The inclusion of the biscuit provides an additional surface area for the adhesive, which increases the joint's load-bearing capacity and helps maintain alignment during the drying process. This is particularly useful in applications like cabinetry, where precise alignment is essential for both functionality and aesthetics.

Lap joints are typically created by overlapping two pieces of wood and do not usually require the use of a biscuit joiner. Miter joints, formed by cutting the ends of two pieces of wood at an angle, and dovetail joints, which interlock in a way that is both strong and decorative, also serve different purposes and wouldn't typically utilize a biscuit joiner for reinforcement. Therefore, the butt joint is the correct answer as it specifically benefits from the reinforcement provided by a biscuit.