Service / Commercial Plumbing
Every walk-in makes water. The evaporator sheds condensate on each defrost, a freezer drain freezes solid if nobody heat-traces it, and a process room needs floor drains that survive a nightly hose-down. WFE runs that plumbing as part of the build: drains, traps, air gaps, washdown stations, and the gas line to a heated dock, installed by 306A plumbers and G1 and G2 gas fitters on our own crew. Commercial and industrial sites only.
Scope
Small scope, big consequences. A drain done wrong floods a freezer floor or fails a health inspection.
A walk-in cooler condensate drain runs from the evaporator pan, through a trap, to an indirect connection with an air gap at the floor drain, so a sewer backup can never reach food storage. In a walk-in freezer the drain line is heat-traced and insulated to the wall, because a frozen drain floods the floor on the next defrost.
Walk-in freezer buildsProcess rooms, meat cutting rooms, and produce coolers get hosed down. We set floor drains and trench drains to the slab slope, run hose bibs and washdown stations with backflow prevention, and coordinate the coved floor-to-wall trim so water goes to the drain, not under the panels.
Food processing buildsHeated loading docks, unit heaters on a freezer receiving bay, and gas-fired make-up air all need a gas line run, tested, and inspected. G1 and G2 licensed gas fitters on the crew do that work. Water supply to prep sinks and washdown stations beside the walk-in is run on the same visit.
Commercial HVAC scopeDrain spec by box
The details that separate a drain that runs for fifteen years from one that floods the floor in February. Five boxes, from one drain to a manifold.
Walk-in cooler
Evaporator pan to trapped indirect drain, air gap at floor drain
Pitched 1/4 inch per foot, PVC or copper
Walk-in freezer
Heat-traced and insulated drain line to the wall penetration
Trap outside the box, never inside
Blast-freeze zone
Heat-traced high-capacity drain sized to the defrost volume
Built into a custom freezer, not a cabinet
Process or cutting room
Floor drains or trench drain on a sloped slab, washdown station
Backflow preventer on the hose bib
Refrigerated warehouse
Multiple evaporator drains manifolded to a common heat-traced run
Drain routing planned around racking
By room
Who, what, and the paper
What the building inspector, the health unit, and your insurer want to see on the plumbing side of a cold-storage build.
Why WFE for the plumbing
On site
Real WFE installs across Ontario. No renders on this page.
Drain from the evaporator pan, insulated, pitched to the wall, trapped outside the box.
Heat-traced and insulated to the penetration. A freezer drain that is not traced floods the floor on the first defrost.
Gas piping run, tested, and inspected by licensed gas fitters. Heated docks and make-up air units get the same treatment.
Deep Dive
Every defrost cycle melts frost off the evaporator coil and sends it to the drain pan. From there a walk-in cooler drain runs downhill, through a trap that stops sewer gas and warm air from climbing back into the box, and ends at an indirect connection with an air gap above a floor drain. That air gap is what keeps a blocked building drain from ever backing up into food storage.
Common mistakes we fix on boxes built by others: a drain with no pitch, a trap inside the freezer where it freezes, and a line dumped straight into a sanitary drain. The walk-in cooler page covers the rest of the build.
A walk-in freezer drain carries water through a room held at −18°C. Without heat trace and insulation it freezes in the line, the pan overflows on the next defrost, and the floor turns to ice at the door. We wrap the drain in self-regulating heat trace, insulate it, keep the trap outside the box, and confirm flow on the first commissioning defrost.
Heated floors, heated door frames, and heated drains are all standard on a WFE walk-in freezer; the plumbing and the electrical for the heat trace are installed by the same crew.
A meat cutting room or produce cooler that gets hosed down every night needs floor drains set to the slab slope, a trench drain where volume is high, hose stations with backflow prevention, and coved floor-to-wall trim so water runs to the drain instead of under the panels. We plan the drain layout with the racking and the equipment, not after them.
The food processing page covers the CFIA and HACCP side of those rooms; the custom cold storage page covers the envelope. This page covers the water.
FAQ
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