Head casing length is a little more than the door width plus two casing widths.

Question

Quizplus · Accepted Answer

This statement is true. The head casing length refers to the horizontal piece of trim that is installed above a door or window. To determine the length of the head casing, you can measure the width of the door and add two casing widths to account for the width of the side casings. This will ensure that the head casing fully covers the top of the door and matches the width of the side casings.

Head Casing Length Is a Little More Than the Door