NCCER Interior Finishing & Drywall

Question 1

What is the standard thickness of drywall used for interior walls in residential construction?

Accepted Answer

1/2 inch

Answer

1/2-inch drywall is the standard thickness for interior walls in most residential construction applications.

Question 2

When installing drywall on ceilings, what is the maximum recommended screw spacing in the field?

Accepted Answer

12 inches

Answer

Ceiling drywall screws should be spaced no more than 12 inches apart in the field to prevent sagging over time.

Question 3

What type of drywall is specifically designed for use in high-moisture areas such as bathrooms?

Accepted Answer

Moisture-resistant drywall (green board)

Answer

Moisture-resistant drywall, commonly called green board, is manufactured to resist moisture damage in high-humidity environments.

Question 4

What is the primary purpose of Type X (fire-rated) drywall?

Accepted Answer

To provide fire resistance in walls and ceilings

Answer

Type X drywall contains glass fibers in its gypsum core that slow combustion and provide code-required fire-resistance ratings.

Question 5

What is the correct technique for cutting drywall with a utility knife?

Accepted Answer

Score the face paper, snap the panel, then cut the back paper

Answer

The score-and-snap method—scoring the face, snapping at the score, then slicing the back paper—is the standard technique requiring no power tools.

(NCCER) National Center for Construction Education and Research Certified Handyman Practice Test