Structural Coordination / Slab Design
STRUCTURAL COORDINATION & SLAB DESIGN GUIDE
Anchoring details, slab thickness, post-tension coordination, and footing requirements, get these right before concrete is poured or pay for it later.
The three failures
that cause change orders.
The three most common, and most costly, coordination failures happen around slab thickness, post-tension cable conflicts, and footing rebar density. Each one is preventable with early planning.
Slab Thickness
01
7″ minimum. No exceptions on doubles.
M12 × 160mm anchors embed 5″. A 7″ slab leaves 2″ of concrete below the bolt. Enough to resist shear under an 8,425 lb load. A 6″ slab leaves 1″. The math doesn't bend.
- Anchor
- M12 × 160mm
- Embed
- 5″ deep
- Load
- 8,425 lb
- Slab
- ≥ 7″
Post-Tension
02
Map PT cables before they're placed.
Drilling 5″ into a post-tension slab without a cable map is how you sever a tendon. That's a slab replacement, not a repair. Coordinate stacker anchor zones with the SE during PT layout. Do this before placement, not after.
- Cable Depth
- varies
- Tolerance
- ± 0″
- Repair Cost
- $$$$
- Schedule Hit
- 2–4 wks
Footing Rebar
03
Triples & quads: don't over-cage the footings.
Deep footings need rebar. Full-density cages without coordination mean crews fight steel for every anchor. Result: 2× install time, longer cure, more labor. Coordinate density with us before the footing design is finalized.
- Applies To
- Triple / Quad
- Install Delta
- +100%
- Cause
- Rebar density
- Fix
- Pre-coord
Early coordination checklist
-
Confirm slab thickness ≥ 7″ in all stacker zones before pouring. No exceptions for double-high units.
-
Map all PT cable paths and provide anchor layouts to structural engineer before cable placement.
-
Coordinate footing rebar density for triples/quads with stacker vendor before footing design is finalized.
-
Concrete grade C30 minimum (or per structural engineer). Verify compressive strength meets anchor pull-out requirements.
-
Anchor bolt spec: M12 × 160mm. Drill depth ≥ 4″. Verify no rebar conflicts at each anchor point.
-
Weight distribution plan: 4,212.5 lbs per baseplate. Confirm slab can handle point loads at stacker locations.
Send us your slab plans. We'll flag the change orders before they happen.
Our engineering team reviews structural drawings against stacker spec and returns annotated red-lines, typically within 3 business days. No charge, no obligation.
