Installation Guide



QCI0280 Page5 Cerfied6/27/14
Note: It is critical that the
threshold U-Channel is
centered on the center-
line.
1If a continuous unit centerline does not exist from the
original measuring process, it will be necessary to create one.
Lightly mark a continuous unit centerline on the threshold.
Next, mark a continuous unit centerline on each wall, starting
where the threshold centerline meets the wall. Use a level to
ensure the wall centerline is plumb and straight. The wall
centerlines should be a minimum of the unit height from the
threshold.
This unit requires the use of a Door Guide [11] that mounts 1
1/2” away from the inside of the horizontal u-channel. Be sure
that the curb is wide enough before drawing centerline for the
u-channel. See example.
Note: Centerline (CL) is a term used to describe the center or mid-point of the unit. The position of
the unit centerline can be located anywhere within the width of the threshold, as long as adequate
structure exists beneath the centerline for fastening and the outer edges of the unit will not over-
hang the threshold. The most common unit centerline position is the middle of the threshold.
2Verify that the U-channels is cut to the appropriate size. This piece of U-channel will
be equal to the opening width. Next drill three 3/16” diameter holes in the center of U-
channel (centerline groove provided for convenience), two holes approximately 2-1/2”
from each end and one in the middle. Place the U-channel in its correct position with the
u-channel centerline over the threshold centerline as marked in step one.
With a pencil carefully mark each hole position on the threshold centerline. Remove the
u-channel and drill a 3/16” diameter hole, approximately 1” deep, directly on the thresh-
old centerline at the marked
locations.
3” Minimum Curb
1 1/2”