Which component is used to protect the outside corners of gypsum board?

Which component is used to protect the outside corners of gypsum board?

• A. tape and joint compound
• B. corner bead
• C. 1/2 J channel
• D. 5/8 J channel

Answer: (B)

Outside corners on gypsum board need a strong, straight edge to resist damage and cracking, and corner bead provides exactly that reinforcement. This metal or plastic strip has flanges that wrap over the edge on both faces, creating a rigid, square corner. It’s fastened to the framing and then finished with joint compound so the corner remains durable and paint-ready. Tape and joint compound alone cover seams and help smooth surfaces but don’t reinforce or protect the corner edge. J-channel pieces are used for other edge finishes and transitions, not to protect or reinforce outside drywall corners.

Outside corners on gypsum board need a strong, straight edge to resist damage and cracking, and corner bead provides exactly that reinforcement. This metal or plastic strip has flanges that wrap over the edge on both faces, creating a rigid, square corner. It’s fastened to the framing and then finished with joint compound so the corner remains durable and paint-ready. Tape and joint compound alone cover seams and help smooth surfaces but don’t reinforce or protect the corner edge. J-channel pieces are used for other edge finishes and transitions, not to protect or reinforce outside drywall corners.