NASCLA Commercial General Building Contractor Exam — All Questions

A wall is scheduled to receive gypsum board with a smooth painted finish under critical lighting. Which describes the correct sequence of finishing the board?

• a.Apply mortar to the joints
• b.Tape the joints, then apply successive coats of joint compound and sand to a smooth, uniform surface before priming and painting✓
• c.Leave the joints untaped because paint will hide them
• d.Paint the board first, then tape the joints

Gypsum board joints are taped and then covered with successive coats of joint compound, each sanded smooth, to produce a flat surface. Higher finish levels (needed under critical lighting) require more coats and careful sanding, followed by priming before the finish paint.Gypsum board finish levels (finishes)