How Should MEP Be Designed for Warehouse Mezzanine Levels?

I give the mezzanine deck its own HVAC zone at minimum — dedicated equipment for enclosed offices, targeted supply and return for open pick modules — with controls sensing at the deck's occupied level where the stratified heat actually lives. Lighting follows the upstairs task: office-grade with controls for enclosed areas, high-output task lighting for pick modules, each on its own switching. Power comes from a subpanel serving the deck, with receptacles, equipment circuits, and data for the WMS stations and scanners upstairs. Every system gets zoned so the mezzanine can run its own schedule without dragging the warehouse system along.

Sprinklers protect both faces of the mezzanine: above for the occupied deck, below for whatever the deck covers — storage, work areas, or circulation. I design the below-deck system for the hazard underneath, coordinate both with the base building hydraulics, and keep structure, lighting, and tray clear of every head's discharge pattern. Smoke detection goes above for the occupied space, with the below-deck area evaluated for detection needs based on its use. Egress lighting, exit signage, and the exit paths down the stairs get verified against the deck's occupant load and travel distances. The deck's fire rating and every penetration through it are detailed with the architect and structural engineer together.

A mezzanine MEP design is ready when it clears this checklist. Mezzanines fail on heat, unprotected undersides, and uncoordinated structure — these items guard all three. • Mezzanine HVAC zoned separately with sensing at the deck's occupied level • Sprinklers designed for above the deck and below it, hydraulically coordinated • Egress lighting, exit signage, and stair paths verified for the deck's occupant load • Lighting, power, and data serving the upstairs task on the mezzanine's own controls • All MEP loads and deck penetrations coordinated with the structural engineer in writing