Door Frame

A door frame is the wood or steel surround that finishes the inside of a garage door opening. It consists of two vertical members called jambs, one on each side, and a horizontal member called the header across the top. Together these three pieces form the rectangle that the door sits in when closed.

The door frame is different from the rough opening. The rough opening is the framed hole in the wall before any finish work. The door frame is installed inside that hole. It provides flat, plumb, and level surfaces for attaching the door's vertical track, stop molding, and weatherstrip.

What attaches to the door frame:

• The vertical track is lag-bolted to each jamb, one track on each side.
• Stop molding is nailed to the jamb face, giving the door panels a surface to close against.
• Jamb weatherstrip compresses against the door edges to block air and water.
• Flag brackets at the top of each jamb connect the vertical track to the horizontal track.

Frame width matters. A standard 9-foot door requires 10-inch wide jambs in most setups. Narrower jambs leave too little bearing surface for the track lag bolts. Most residential frames use 2x6 or 2x8 lumber, giving a net width of 5.5 or 7.25 inches.

For example, a concrete block garage often lacks a wood frame entirely. An installer will attach treated lumber jambs directly to the block with masonry anchors to create a door frame before the track goes up.

The door frame is closely related to low headroom hardware situations, where the header height sets a tight limit on the horizontal track position and spring assembly clearance.