Decking + flooring.
B-deck + concrete, resin board, bar grating, or diamond plate. The right deck depends on your live load, your fire rating, and what's happening above and below it. 416 spec's it per use, not per catalog.
Pick the deck that matches the use.
The mezzanine deck does three things at once: carries the live load, defines the fire rating between levels, and decides whether sprinkler water can pass through to the floor below. Wrong deck = code violation, sprinkler shadow, or under-spec capacity.
416 picks the deck per use. Storage at 250 psf with sprinkler coverage above + below gets one answer. An open office floor with low live load gets another. A maintenance platform with chemical exposure gets a third.
Every deck choice is reflected on the engineer-stamped drawing — load capacity, deflection limit, fire rating, finish.
Four standard finishes.
Storage mezzanine standard
22-20ga B-deck with 2-3" concrete topping. 250 psf+. Hard-wearing, fire-resistant. Most common storage choice. Sprinkler water doesn't pass through.
Office + light pick
Engineered wood + resin top. Quiet, level, dry. Painted or sealed. 125 psf typical for offices + pick mezzanines.
Sprinkler + light pass-through
Open serrated steel grate. Lets sprinkler water + light reach below. Required for cold-storage + some hazardous occupancies.
Maintenance + equipment platforms
Solid steel raised-pattern deck. Slip-resistant. Best for mechanical decks, chemical exposure, frequent wash-down.
Engineered to your live load.
| Spec | Range | Notes |
|---|---|---|
| B-deck + concrete | 250+ psf live load | 22-20ga deck, 2–3" topping · most common storage deck |
| Resin board | 125 psf typical | Engineered wood + resin · office + light pick |
| Deflection limit | L/360 office · L/240 storage | Per OBC, recorded on the drawing |
| Fire rating | 1-hr + 2-hr assemblies | Per OBC where occupancy requires · ULC certification |
| Standards | CSA A344-17 · ANSI MH16.1 | Engineer-stamped drawings included |
Load + fire + sprinkler, checked.
Live load checked + stamped
Every deck assembly is checked against expected live load + impact factor. Deflection limit L/360 per OBC for office, L/240 for storage. Recorded on the drawing.
OBC fire-rating compliant
Where occupancy or building separations require a rated floor, the deck assembly is spec'd to ULC certification. Documentation included in the submittal.
Sprinkler coverage verified
If your sprinkler system covers below the mezzanine, the deck choice has to let water through (grate) — or coverage above + below must be added. 416 coordinates with your sprinkler trade.
Tight, plumb, level
All deck panels mechanically fastened to the mezzanine frame. Edges sealed. Level checked corner-to-corner before turnover.
Decking is one part of the platform.
Where the right deck earns its keep.
Storage mezzanines carrying pallet or carton load want B-deck + concrete at 250 psf+. Office or light-pick floors above storage want a quiet, level resin board. Cold-storage and some hazardous occupancies need bar grating so sprinkler water reaches the floor below. Maintenance and equipment platforms want diamond plate for grip and wash-down. Send the use, and 416 matches the deck on the engineer-stamped drawing — load capacity, deflection limit, fire rating, and finish all recorded.
Spec'ing a mezzanine deck?
Send your intended live load + sprinkler context + fire-rating constraint. We'll match the deck on the drawing.
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