What is a common method to prevent mitre joints from opening?

Using biscuits and silicone is an effective method to prevent mitre joints from opening. Biscuits are small, oval-shaped pieces of compressed wood that are used to reinforce joints. When you cut slots into the edges of the pieces being joined and insert biscuits, they expand when glued, creating a strong mechanical bond that holds the pieces securely together. This added strength is particularly beneficial in mitre joints, which can be particularly vulnerable to movement and separation due to pressure or temperature changes.

Silicone serves as an adhesive that also enhances the flexibility of the joint. This flexibility helps absorb slight movements or shifts that could otherwise cause the joint to open. The combination of the biscuits providing mechanical support and the silicone offering a degree of elasticity makes this an excellent approach for maintaining the integrity of mitre joints over time.

Other methods, such as using drywall screws or relying solely on clamps, do not provide the same level of support or durability in the long term. While wood glue can add strength, it may not adequately address the potential for joint movement without additional reinforcement like biscuits.