When installing drywall on walls, how much gap should typically be left between the bottom edge of a drywall sheet and the subfloor or finished floor?

Question: When installing drywall on walls, how much gap should typically be left between the bottom edge of a drywall sheet and the subfloor or finished floor?

Answer options:

• 5 mm (3/16 inch) ✅ 10 mm (3/8 inch)
• 2 mm (1/16 inch)
• 0 mm (resting directly on the floor)

Correct answer: 10 mm (3/8 inch)

Explanation: Leaving a gap of approximately 10 mm (3/8 inch) between the bottom of the drywall and the subfloor/finished floor is standard practice. This prevents moisture wicking from the floor, prevents damage from accidental kicks, and allows for minor building settlement without cracking the drywall. A smaller gap won't provide adequate protection, and resting directly on the floor can lead to moisture damage and cracking.