ABT, Inc. • PO Box 837 • 259 Murdock Road • Troutman, NC 28166
(800) 438-6057 • (704) 528-9806 • Fax: (704) 528-5478

Concreting

Note: Concrete used to encapsulate PolyDrain products must be equal to a or greater than the strength, thickness and reinforcement of the concrete used for the adjacent floor structure. The 4" minimum is sufficient only in benign applications.

Reminder: Concrete should be placed in the trench in a manner so as not to disturb the properly aligned channel system. Do not chute concrete directly against channels!

Work concrete under channels and vibrate with a finger-type vibrator.

The top edge of the channels or sidewalls may be used as a screed rail during concrete placement. If a light, motorized vibratory screed is used, it is necessary to first make a placement of concrete to a height of approximately 1/2" above the lower anchoring rib of the channel or , when installing sidewalls, above the lower anchoring rib of the sidewall. Then allow concrete to set up before placing next layer and placing screed on channel/sidewall edge. The final pour must be keyed or dowled to the previous pour or thermal expansion or contraction may break channel side walls.

Note: When placing concrete in multiple layers (one, to fill just above lower anchoring rib, and two more, to fill in the remainder), be sure that the last placement will be at least 6" thick to avoid cracking at the top layer.

It is recommended the finished level of the concrete be between 1/8" above the top edge of the channel or sidewall to level with the top edge of the channel or sidewall. This will help protect the exposed edges of the channel/sidewall.

A finished slope of 1/8" per foot for two feet on each side of the trench is also recommended. This will provide a positive drainage flow into the channel system.