Chamberlain 1280 - 1/2 HP - Manual (Page 21)

Horizontal and vertical
reinforcement is needed for
lightweight garage doors
(fiberglass, aluminum, steel,
door with glass panel, etc.).
Header Wall
Vertical
Centerline of
Garage Door
— Finished Ceiling —
Optional
Placement
of Door
Bracket
Header
Bracket
2x4 Support
Door
Bracket
For a door with no
exposed framing or for
the optional installation,
use 5/16"x1-1/2" lag
screws (not supplied) to
fasten door bracket.
Door
Bracket
Top of Door
(Inside Garage)
Carriage Bolt
5/16"-18x2-1/2"
Optional
Placement
Lock Washer
5/16"
Nut
5/16"-18
Top Edge
of Door
All ONE-PIECE Door Installation Procedure
• Center the bracket on the top of the door, in line
with the header bracket as shown. Mark holes.
• Drill 5/16" pilot holes and fasten the door bracket
with hardware supplied.
If the door has no exposed framing, drill 3/16" pilot
holes and fasten the bracket with 5/16"x1-1/2" lag
screws (not supplied) to the top of the door.
The door bracket may be installed on the top
edge of the door if required for your installation.
(Refer to the dotted line optional placement
drawing.) Drill 3/16" pilot holes and substitute
5/16"x1-1/2" lag screws (not supplied) to fasten
the bracket to the door.
21
Please read and comply with the warnings and reinforcement instructions on page 20.
They apply to one-piece doors also.
Carriage Bolt
5/16"-18 x 2-1/2"
Nut 5/16" - 18 Lockwasher 5/16"
Hardware Shown Actual Size