Question: how gypsum ceiling is installed?
Answer: Step 1 - Important Measurements. To begin, use your tape measure to measure the ceiling by using a wall that is perpendicular to the joists. ... 
Step 2 - Custom Gypsum Boards. Take your razor knife and shorten a piece of gypsum board to this exact length. ... 
Step 3 - Screwing Them Up. ... 
Step 4 - Seams Simple Enough.