Installation

PolyClips are installed at the channel joints. Height adjustment is made by loosening the wingnut and sliding brackets up or down the U-legs. Tightening the wingnut fixes the height while, at the same time, drawing the channels together for a tight joint. Channels can then be secured to the subgrade either by pouring a non-structural anchor slab or by driving two rebar stakes (#3 or #4) through preformed holes in the U-leg.

This method is best suited for retrofit installations where an existing surface can serve to suspend the channel sections or in new construction where forming lumber is in place.

Secure 2"x4" boards across channel using bolts or threaded rod and PolyDrain lock toggles, one assembly at each red dot. Mask the grate openings to prevent concrete from entering the channels during placement.

Insert anchor lugs into all four corners of each frame. With channels properly positioned, secure 2"x4" to supporting surface to prevent lift during concrete placement. Place and consolidate concrete under and around channels, then finish to proper grade. 2"x4" boards can be removed once concrete has become stiff enough to finish.

Place a low-slump (1"-2") concrete in the trench to a depth that will ensure at least 4" of concrete under the channels. (Patties of stiff concrete can be substituted for continuous slurry.) Position channels in the slurry, ensuring that the concrete comes above the anchoring ribs. Set top of channel 30 mm (1.2 in) below finished grate to compensate for the thickness of grates which will be installed later. Re-check channel alignment and grade before the concrete stiffens.

After the bedding slurry sets, place grates on channels and mask grate openings to prevent concrete from entering the channel. Install anchoring lugs. Concrete can then be placed and consolidated around the channels and finished to the proper grade.