Jamb Width Exterior Door at Exterior

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Jamb Width Exterior Door. Add 3/4 to unit width measurement. Many people measure the inside jamb of the door and decide that this is the jamb width;

Masonite 36in x 80ft Pine Exterior Door Jamb Extender
Masonite 36in x 80ft Pine Exterior Door Jamb Extender from www.lowes.com

Our extensive inventory selection allows us to fill. Use a measuring tape to measure the width from one end of the door jamb to the opposite side jamb's exterior edge. Discussion starter · #1 · mar 25, 2014.

Masonite 36in x 80ft Pine Exterior Door Jamb Extender

I'm not sure which material you are using for walls but let's say you are using 1/2″ drywall on both sides of the wall so you're total thickness is 6 1/2″. Measure across the top of the door jamb. When measuring door trim, always take this into consideration. For example a 12″ wide jamb with two inches’ worth of trim (or casing) would have an outside measurement of 11″.