Introduction
The morning of the pour is the last moment every reinforcement decision is still fixable — and the first moment none of them are. Once concrete covers the grid, spacing errors, missing chairs, and short laps become permanent residents of your slab. A structured final check, done before the truck arrives, is the cheapest quality control in the entire project.
The Concrete Reinforcement Calculator gave you the quantities; the pro tips guide showed you how to build the grid. This checklist is the verification pass: everything to confirm, in order, before concrete is placed. Print it, walk the slab with it, and don’t pour until every box is checked.
Phase 1: Design and Paperwork (Days Before)
- ☐ Structural drawings on site showing bar size, grade, spacing, laps, and cover — or the building department’s prescriptive detail if that’s what governs your project
- ☐ Permit in hand (where required) and reinforcement inspection scheduled — see the code compliance guide
- ☐ Cut list written from the calculator quantities: every bar length, quantity, and splice plan — per the estimating workflow
- ☐ Any field changes to size, spacing, or laps approved by the engineer in writing — never redesign verbally on site
Phase 2: Material Verification (Delivery Day)
- ☐ Stick count matches the order (count at the truck, not after unloading)
- ☐ Bar size verified — check the mill markings rolled into the bars, not just the bundle tags
- ☐ Grade tags match the drawings (Grade 40 vs 60 — they’re not interchangeable without approval)
- ☐ Steel condition acceptable: light surface rust is fine; reject pitted, flaking, or heavily scaled bars
- ☐ Chairs, tying wire, and ties on site in the planned quantities (~1 chair per 16–25 ft² of grid)
- ☐ Steel stored off the ground on dunnage, covered if rain threatens
Phase 3: Grid Layout and Tying
- ☐ Bar positions marked on the formwork with a tape measure — every position, both edges, not just the first few
- ☐ Bars cut to layout length (slab dimension minus cover both ends — 23.5 ft bars for a 24-ft slab at 3-in cover)
- ☐ Spacing verified by measurement across the full slab — no drift; no gap wider than specified
- ☐ Lap splices at the specified length (commonly ~40 bar diameters — confirm against the drawings), staggered so adjacent splices don’t align
- ☐ Every splice tied in at least two places (both ends of the lap)
- ☐ Every other intersection tied for flatwork; every intersection at laps, edges, and corners
- ☐ Wire tails twisted tight and cut — nothing poking up toward the finished surface
Phase 4: Supports and Position
- ☐ Chairs in place at 4–6 ft spacing in both directions — no bar resting on the ground or vapor barrier
- ☐ Grid height correct: steel in the designed position (upper third for slab-on-grade per the drawings), verified with a tape from the subgrade
- ☐ Edge cover confirmed: bar ends the specified distance (commonly 3 in / 75 mm) from the formwork all around
- ☐ Grid walked and bounce-tested — any intersection that springs back gets tied; any sagging span gets another chair
- ☐ Penetrations (plumbing, electrical) sleeved and the grid adjusted around them per the drawings
Phase 5: Pre-Pour Final Pass (Pour Morning)
- ☐ Overnight damage check: wind, deliveries, or foot traffic can shift bars and knock chairs — re-verify spacing and supports
- ☐ Grid clean: no mud, oil, standing water, or debris on the steel (bond breakers become delamination)
- ☐ Formwork still true: re-measure inside dimensions at two points per side — forms move
- ☐ Inspection passed (where required) — never pour before a required inspection
- ☐ Photograph the complete grid: spacing, laps, chairs, measurements — the permanent record of what’s inside the slab
- ☐ One person assigned to steel watch during the pour, with authority to stop and re-tie
- ☐ Concrete order confirmed: volume, mix, slump, and arrival time — the Concrete Calculator covers the volume side
Common Last-Minute Failures This Checklist Catches
| What you find | What it means | Fix |
|---|---|---|
| Bars on the ground, no chairs | Grid will end up at the slab bottom | Install chairs before the truck arrives — non-negotiable |
| Spacing drifted to 24 in at the far end | Half the slab is under-reinforced | Re-mark with a tape and re-tie the drifted bars |
| Splice laps visibly short | Load can’t transfer between bars | Re-lap to the specified length and re-tie |
| Bar ends touching the forms | No edge cover — corrosion path | Trim or reposition bars to restore cover |
| Mud caked on the bars | Broken concrete-to-steel bond | Wire-brush clean before pouring |
Every one of these is a ten-minute fix at 7 AM and a permanent defect at 9 AM. That’s the entire argument for the checklist. The common mistakes guide explains why each of these matters structurally.
Related Guides
- Pro Tips — the techniques this checklist verifies.
- Complete Guide — the full how-to with a worked example.
- Code Compliance — inspections and when stamped drawings are needed.
- How to Estimate — the cut list behind Phase 1.
- FAQ — quick answers on spacing, laps, and sizing.
Frequently Asked Questions
When should I do the final reinforcement check?
The morning of the pour, after the grid is complete — overnight wind, deliveries, or foot traffic can shift bars and knock chairs. Re-verify spacing and supports even if everything was right yesterday.
What should I photograph before the pour?
The complete grid: overall layout, close-ups of lap splices with a tape showing the lap length, chair spacing and grid height, and edge cover at the forms. It’s the permanent record of what’s inside the slab.
Can the pour proceed if the inspection hasn’t happened?
No — never pour before a required inspection. Concrete over uninspected steel can mean stop-work orders or demolition for verification.
How do I know the chairs are holding the right height?
Measure from the subgrade (or vapor barrier) to the steel with a tape at several points and compare to the drawings. The grid should sit in the designed position — upper third for slab-on-grade — not wherever gravity left it.
Check It, Photograph It, Pour It
Five phases, one walk-through, zero surprises: paperwork, materials, grid, supports, final pass. Run your quantities through the Concrete Reinforcement Calculator before you order, build to the drawings, and let this checklist be the last thing you complete before the truck backs in. The slab will hide everything — make sure what’s hidden is right.
Disclaimer: This checklist is a verification aid, not a substitute for structural design or code compliance. Spacing, bar size, lap lengths, cover, grades, permits, and inspections are governed by the structural drawings and local building code. Consult a licensed engineer or your local building authority for your project.
