McNICHOLS Trench Drain System: Retrofit Installation

There are 6 steps to the Retrofit installation process. See below for details.

Main Installation Diagram
   Trench Drain System Retrofit

Note: All reinforcement bar details and expansion joints are to be developed by the slab designer. Trench drain must not be used as an expansion joint, construction joint, or control joint.

Kit Contents
Kit Contents
Kit Number 1 2
Run Length (Feet) 20 40
# of Channels 5 10
# of Grates 10 20
# of Locking Devices 11 21
# of Installation Chairs 7 12
# of End Caps 2 2
# of Grate Bags 10 20

Tools Required
· 1/2" Wrench or Socket   · 9/16" Wrench or Socket   · Hammer
· Level   · String Line   · Duct Tape
· Tin Snips

McNICHOLS Standard Chair Installation
(Secure chair in bottom dimples on the channels)

Trench Drain System Retrofit

Step 1
Excavate site leaving a minimum of 4 inch clearance (or an amount equal to the slab thickness, which ever is greater) around sides and underneath. Once excavations are complete, place all of the required components (in descending numerical order starting at discharge end of run) next to excavation.

TIP: Use a "string line" as a guide for the finish grade.

Note: Length of rebar to be determined by soil conditions on site. Rebar needs to be long enough to provide stability for the installation.
  Trench Drain System Retrofit Step 1

Step 2
Begin the installation of the channels at the discharge end of the drain run.

(Skip to Step 3, unless using bottom cutout.)

Drill out the appropriate opening and install the channel over the outlet pipe.

Trench Drain System Retrofit Step 2

Step 3
Pre-attach an installation chair to the outlet end of each channel, by tightening the bolts into the dimples. Loosen all rebar straps and begin sequence of installing the channels. Place precut #4 rebar through the installation chairs. Drive rebar into the ground, enough to provide stability and prevent "floating". Adjust the chair, raising or lowering the channel to the final grade and secure the alignment bolts. The top of the rebar should be a minimum of 2 inches below top of channel.

Note: If the heavy duty hardnose frame is used, final grade is to the top of the frame.

TIP: If local code requires joint sealant, use one part Urethane sealer for water or use appropriate epoxy for chemicals (not included).

Trench Drain System Retrofit Step 3

Step 4
Cut end caps to proper size using Tin Snips. If using drain end caps, remove center diaphragm and attach to channel where needed.

TIP: Use duct tape (not included) to hold end cap onto channel while concrete is being poured.
  Trench Drain System Retrofit Step 4

Step 5
Place grates in grate bags provided and place in channel. Install locking device by pushing through plastic and securing.

Trench Drain System Retrofit Step 5

Step 6
Pour concrete after the system is in place and rebar chairs are properly tightened. After concrete has set up, remove grates and properly dispose of plastic bags. Finally, replace all grates and locking devices and secure.

Note: Do not tool finish or radius the edge of the concrete along the drain channels. Finish-trowel or broom only to the top edge of the drain channels.
  Trench Drain System Retrofit Step 6