The pre-pour inspection is the highest-stakes milestone inspection in concrete construction. Once the concrete is placed, any problems with formwork, reinforcement, or embedded hardware are either invisible or prohibitively expensive to fix. A thorough pre-pour inspection — properly documented — is the last line of defence against costly rework.
Here's exactly what to check, why documentation matters, and how to make the process fast enough that crews actually do it.
The complete pre-pour checklist
Formwork
- Formwork is correctly positioned and dimensionally accurate (verify against drawings)
- Forms are plumb and square — check with a level
- All joints are sealed or properly formed to prevent paste leakage
- Formwork is adequately braced and shored for the concrete load
- Formwork surface is clean and form release agent has been applied
- Temporary openings for concrete placement are correctly positioned
Reinforcement
- Rebar size and spacing matches design drawings
- All required laps and hooks are present and correctly formed
- Rebar is clean — no loose rust, oil, mud, or excessive scale
- Cover depth is correct — verify with cover spacers or chairs, minimum cover maintained throughout
- All bars are tied securely and won't shift during placement
- Additional reinforcement at openings, corners, and reentrant angles is installed
Embedded hardware
- All embedded plates, anchors, sleeves, and conduit are in correct position
- Embedded items are securely fixed and won't move during placement
- Pipe sleeves and conduit are capped or plugged to prevent concrete ingress
- Anchor bolts are correctly positioned and plumb — check against column layout
Subgrade (slabs on grade)
- Subgrade is compacted to spec and at correct elevation
- Vapour barrier is installed, lapped, and sealed at joints and penetrations
- Drainage and underslab services are complete and approved
General
- Required inspections and approvals have been obtained (structural, municipal)
- Concrete mix design and delivery schedule are confirmed
- Placement and vibration equipment is on site and operational
- Curing materials and procedures are planned
Why photo documentation matters
Rebar cover depth disputes, reinforcement placement claims, and formwork compliance arguments are common in concrete construction. The only way to resolve them quickly is with photographic evidence taken before the pour.
GPS-tagged, timestamped photos tied to specific checklist items create a clear record: this item was inspected, by this person, at this location, at this time, and it looked like this. That's not just good practice — it's protection when a dispute arises months or years later.
Making the inspection fast enough to actually do
The problem with paper pre-pour checklists is that they slow the crew down enough that people start cutting corners. A digital checklist on a phone is faster: tap to open the item, take the photo, next item. The whole inspection for a typical residential slab takes 10–15 minutes on a phone versus 25–30 on paper.
Manifold's photo-linked checklists work fully offline — no signal required at the pour site. Complete the inspection, export the PDF, and share it with your engineer or GC before you leave the site.
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