Modular mezzanines. Bolt-together, relocatable, fully engineered.
When the same mezzanine geometry repeats across multiple sites — or when a fit-up may need to move with the tenant — a bolt-together kit is faster to install, easier to relocate, and engineered to the same OBC standards as a welded mezzanine. Same drawings, same load class, different connection detail.
Where it fits
Same engineering, different connections.
"Modular" means the connections — beam-to-column, brace-to-frame, deck-to-beam — are bolted instead of welded. The structural design is no different; the steel sizes, the load capacities, the deck options are all the same as fully welded work. What changes: site time drops from days to hours, the install crew doesn't need a welder, and the mezzanine can be unbolted and moved if the operation does.
When modular wins
- Multi-site fit-ups — same geometry repeated across multiple buildings; one engineering package, multiple installs.
- Tenant fit-ups — when the lease has a defined end and the tenant may want to take the mezzanine with them.
- Tight shutdown windows — bolt-together installs don't need hot-work permits, fume extraction, or fire-watch.
- Restricted-access sites — food-grade, clean-room, or occupied tenant spaces where welding fumes are problematic.
- Future expansion — easier to extend a bolted mezzanine into adjacent space than a welded one.
When fully welded wins
- One-off geometry — single-mezzanine projects rarely justify the modular shop tooling.
- Heavy-load applications — > 250 psf with concentrated point loads is cleaner with welded moment connections.
- Architectural visibility — bolted connections are visible; welded mezzanines are smoother.
Detail decisions
- Beam-to-column — A325 structural bolts in shear and tension; engineered as moment-resisting at corners.
- Decking — bolted bar-grate or B-deck per the load class; field-installed without site welding.
- Bracing — diagonal bracing or moment-frame; bolted to the column with flange plates.
- Stair connection — bolted stair-to-mezzanine attachment; matches our modular stair approach.
- Footings — same as welded; concrete pads sized to column load.
Typical parameters
- Live load125 – 250 psf typical (heavy classes possible)
- ConnectionA325 structural bolts (primary frame)
- Site assembly time~50% of welded install
- Component weighteach piece < 200 lbs (forklift-installable)
- Deckbar-grate / B-deck + concrete (post-install pour)
- Finishpowder-coat or galvanized (shop-applied)
- Lead time5 – 7 weeks from sign-off
Related
- All mezzanines & work platforms
- Storage mezzanines — most common modular application
- Modular stairs — same approach for stair access