The 4 1/2-inch-wide jamb on the pre-hung door is made to accommodate 1/2-inch drywall on each face for a total wall thickness of 4 1/2 inches. So no 1/4-inch drywall for you.

Did you know that two-by-four boards are not 2 inches by 4 inches? Their real dimensions measure a half-inch shorter on both sides. In fact, all dimensional lumber is smaller than advertised. This ...

Did you know that two-by-four boards are not 2 inches by 4 inches? Their real dimensions measure a half-inch shorter on both sides. In fact, all dimensional lumber is smaller than advertised. This ...