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6. PREPARATION FOR INSTALLATION
6.1. NEW CONCRETE CHANNEL WITH BOXOUTS
Verify the straightness of the channel and boxouts where the frame will be installed. A plumb line, a laser
and/or a straight edge can be used.
1. First verify the channel depth (height) against the submittal drawing. A variation of ± 25mm (1’’) is
acceptable and will not impact the installation or operation.
2. Verify the position of the boxouts. They must be aligned and face to face within ± 6mm (1/4’’).
3. Measure the boxout width, making sure they are at least 50mm (2") larger than the frame.
4. Measure the channel width at the bottom and mark the channel center on both the upstream and
downstream sides of the boxout, on the channel bottom slab. The channel width should be the
same as the gate clear opening inside the frame.
5. Measure the overall width of the frame. From the channel center previously marked, place
another mark in the boxouts equivalent to half of the frame overall width. Repeat the other side.
The outside limits of the frame will be positioned to those marks.
6. Drop a plumb line into the boxout, centered on the mark indicating the outside limit of the frame.
There should be a gap of at least 16mm (5/8"), for the whole channel depth. (see Figure 2)
Figure 2
7. Make sure the boxout is straight and vertical within ± 20mm (3/4") for the whole channel depth.
8. Repeat points 6 & 7 on the other side of the channel.
If corrective work is needed, have it done by a skilled professional.
6.2. EXISTING CONCRETE CHANNEL (SURFACE MOUNT)
Verify the straightness of the channel walls and floor where the gates will be installed. A plumb line, a
laser and/or a straight edge can be used.
