Anonymised, illustrative composite. An Alberta mechanical sub invoiced for 14,200 square feet of fireproofing on structural steel. The GC’s own recollection of the punch walk supported closer to 12,000. The ceiling grid was already closed in, and nobody wanted to open it to find out who was right.
At a glance
Fireproofing is exactly the kind of scope that becomes unverifiable the moment the next trade closes over it — a ceiling grid goes in, and what is behind it becomes a matter of record rather than something anyone can walk out and look at. The GC’s site team had done a punch walk before the ceiling closed in, as it did on every floor, but a walk is not a measurement, and nobody had run tape on the coverage at the time.
When the sub’s invoice came in at 14,200 square feet, the GC’s recollection of that walk put the real number closer to 12,000 — a gap worth $6,270 at the contract rate, and one neither side could resolve from memory alone.
Both sides had reasons to believe their own number. The sub had crew timesheets and material draw-downs that were consistent with 14,200 square feet, though timesheets alone do not prove where the material actually went. The GC’s site team had walked the floors before the ceiling closed and genuinely believed the coverage looked lighter than that — a judgment call made quickly, on a walk covering several other trades’ work at the same time, not a measurement.
Reopening two floors of finished ceiling to physically re-verify coverage was the obvious fallback, and the obviously expensive one — an estimated $8,400 in demolition and patch-back, plus roughly six working days of schedule float neither floor had to spare. The alternative was whatever record already existed from before the ceiling closed. Procore’s Daily Log tool runs a defined set of entry types — Inspection Entries among them — and “supports photo uploads and attachments across all entry types.” The site team had been photographing inspection walks as a routine step long before this dispute existed, not because anyone anticipated needing to prove a quantity months later.
Pulled from the log, the Inspection Entry photos for both disputed floors were dated and time-stamped from the days immediately before each ceiling section closed in. Laid against the floor plan, the photographed coverage extents came out within about 3% of the sub’s invoiced 14,200 square feet — close enough that the GC’s from-memory estimate, not the invoice, was the figure that turned out to be off.
What made the photos persuasive was not that they were photos — it was that they were routine. They existed because photographing an inspection walk was already a defined Daily Log step on this site, applied to every floor whether or not a dispute was ever going to follow. A photo taken specifically to win an argument, after the argument has started, invites the obvious question of what it was pointed at and why. A dated entry sitting in the log months before anyone disagreed about anything does not carry that problem.
That distinction matters because either side could, in principle, have gone back and photographed the closed ceiling from outside for their own case — and neither photo would have proven anything about what was actually behind the drywall. Only a record made before the cover-up, tied to the moment the work was still visible, could actually answer the question in dispute.
Had the two sides not settled it from the log, Alberta’s Prompt Payment and Construction Lien Act adjudication process exists for exactly this kind of disagreement: a contractor or subcontractor may seek an adjudicator’s determination on the “valuation of services or materials provided under the contract or subcontract” without going to court.
The sub was paid the full $40,470. The GC made photographing concealed work — fireproofing, waterproofing, rough-in before drywall — a mandatory Daily Log step rather than an individual habit, specifically so the next scope argument has the same record to settle it. See what a daily site log is expected to contain, and for a related case on documentation carrying an investigation rather than a payment dispute, see how a site diary became the evidence that mattered.
For how firms are extending photo-based site documentation with AI tools, see AI-assisted site photo and camera tools.
A 30-minute call is enough to tell you whether AI pays for itself here.
