When measuring to replace a slab door, measure the width, height, and thickness of the door.

Door jamb width. However, some manufacturers design bifold doors with three, five, or six door options of varying widths. Focus on these two equations, 2 side jamb length = door height + jamb stock thickness + ¾ inches + ½ inches + 3/32 inches. The jamb width is the width of the jamb as it meets the wall stud of your house.

Exterior door jambs are usually. Many people measure the inside jamb of the door and decide that this is the jamb width; The width of door panels of standard bifold doors meant for internal installation.

Wall thickness includes the wall stud plus the sheetrock thickness. This is the ideal thickness. To measure a door jamb, you’ll measure from the visible edges of the jamb, which is why it’s important to remove the casing first.

Measure from the door frame to where the drywall starts, this is your casing, the measurement of the size trim you will put around the door. Door jamb thickness interior door jamb:. Door jambs must cover the entire thickness of the wall where the door will be placed.

Top jamb length = door width + 3/16 inch +. The door jamb is the frame that installs in the wall and supports the door via hinges. You may find that the measurements above are too large, or too small, for your opening.