How to Measure a Door Opening

• DOOR WIDTH - Measure the distance between the inside point at the jamb of one side of the opening to the other. Take this measurement at several places along the jamb to insure a square opening. Do not allow for more than 2 inches of overlap for the door sections, because a panel design may run inside the door jamb and distort the overall door appearance.
• DOOR HEIGHT - Measure the distance from the floor to the underside of the header at several places to insure a correct reading.
• SIDE ROOM - The minimum side room (door jamb to wall) should be 4 inches. This space is needed to secure the vertical track brackets to the jambs.
• JAMB SPECIFICATIONS - Side jambs should be constructed of 2x4 or 2x6 lumber. Check the condition of the existing jambs for cracking or rotting that will compromise the bracket attachments.
• CHECK THE FLOOR AT THE OPENING - A full width bulb type weatherstrip is attached with an aluminum retainer to the bottom of the door that will rectify variances up to 1" in the garage floor.