Standard spacing schedule
Walls: 12 inches on center in the field (middle of sheet), 8 inches along tapered edges and butts, screws 3/8–3/4 inch from paper edge. Ceilings: 8 inches on center in field and edges on 1/2 inch board.
Some jurisdictions require 7 inches on ceiling edges — always confirm local amendments. Over-driving screws breaks paper and loses holding power; use a dimpler bit.
Stud alignment and missed fasteners
Screws must hit framing. A line of missed screws along a stud bay causes flex and cracked mud later. Snap chalk lines on face paper for ceiling joists before hanging, or use a stud finder on each course.
Estimating screw count
Rule of thumb: one 1-lb box (about 350 screws) per 500 sq ft of drywall on walls. Ceilings use more fasteners — plan 1 box per 400 sq ft. Our calculator outputs total screw count with your sheet estimate.