Watts Dead Level P - Manual

Excavation
The excavation must be sufficient to allow a minimum 4" concrete
pour below, and on both sides of the trench drain.
Excavation for a catch basin must allow for 4" of concrete below the
basin.
Layout
Dead Level trench drains are generally shipped with channels as-
sembled to the corresponding frames. A channel can be disengaged
from the frame by sliding it approximately 4" in either direction, and
pulling the channel and frame in opposite directions (Fig. A).
Working from the deepest outlet connection(s) back upstream, lay
the trench drain sections in order of installation along side the open
trench. Each channel and frame section is marked with arrows, indi-
cating the direction of flow. The installer may wish to run a string line
along the trench to indicate the desired finished grade.
Catch Basins & Piping Connections
Catch basins, if used, should be set first. Using a reciprocating or
hole saw, remove the circular pipe connection cut-out(s) where the
basin will connect to discharge piping. Invert the catch basin on a flat
surface, and butt the corresponding channels against the pattern on
the basin. Use a reciprocating saw to remove the cutout on the basin.
With the cutout correctly removed, the channel tongue should slide in-
side the hole in the basin, with the channel flange flush against basin’s
exterior wall (Fig. B).
If a catch basin is not used, pipe connections are made to the bottom
of the channel, or to an end cap. Drill through the molded pipe hub
with a 4" hole saw or reciprocating saw, taking care not to rake the
inside wall of the hub. Make No Hub pipe connections with a suitable
coupling (by others).
FIG. B
FIG. A
Frame
Channel
Lift
Slide
Slide
Rebar Anchoring & Leveling
Starting from the outlet or catch basin, align the structural frames
along the excavated trench. Drive a minimum of 4 pieces 1/2" #4 rebar
to support each frame section. The rebar should reach a depth suf-
ficient to provide stability for the system, and prevent floating during
the concrete pour. Level the system by sliding the frame ears along
the rebar. Secure the frame to the rebar using 3/8" hex bolts (Fig. C).
Joint Connections
Making sure all sections are aligned with flow arrows pointing towards
the outlet, connect channels and end caps through the flanges using
1" flanged hex bolts (Fig. D). Using frame connectors F-L, join the
frames from the top using 3/8" hex bolts (Fig. E).
It is usually unnecessary to seal channel joints in on-grade installa-
tions. If corrosive solutions are present, or sealed joints are otherwise
desired, use a small bead of silicone caulk to seal each channel joint.
FIG. C
FRAME
1/4-20x3/8" Hex Bolt
1/2" #4 REBAR
FIG. D
FIG. E
1/4 x 1" SELF-TAPPING
HEX BOLTS
Dead Level Trench Drain Installation