How Drawing Review Caught an Unsupported Roof Condenser
- A 5,000-lb roof condenser array had no structural support detail, the condensing unit clashed with the electrical gear, and the emergency-generator pad was undersized.
- Helonic checked the hotel PDF sets for structure, electrical, and equipment pads before CD.
- Those three findings are the kind that become $50,000 to $300,000 change orders once the equipment is on site.
Nashville, TN. 286 issues on 372 pages.
Issues Detected
286 on 372 pages
Field Cost
$50K to $300K each
Key Findings
Condenser, power, generator
A 5,000-lb Roof Condenser With No Support Detail
An owner's rep was reviewing construction documents for two hotels in Nashville. The roof carried a condensing-unit array the mechanical sheets sized at about 5,000 lb. The structural sheets had no support detail under it.
The same condensing unit sat on the electrical plan where the gear and the feeder could not both fit. The emergency generator pad on the civil sheet was smaller than the generator the electrical one-line called for.
Each of those is a field change once the unit is ordered. The owner's rep wanted them on the drawings before CD.
Helonic Flagged the Condenser, the Electrical Clash, and the Generator Pad
They uploaded both PDF sets, 372 pages. Helonic compared the roof equipment weight with the structural details, the condensing unit with the electrical room, and the generator with its pad.
The list was 286 issues. The three that mattered first were the 5,000-lb roof condenser array with no structural support detail, the condensing-unit electrical conflict, and the undersized emergency-generator pad.
The design team added the roof support, moved the electrical gear, and resized the generator pad before CD.
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286 Issues on 372 Pages, $50,000 to $300,000 Kept Out of the Field
The owner's rep treated those three as field change orders in the $50,000 to $300,000 range: a new roof frame after the condenser is set, a rework of the electrical room, and a pad pour that has to be broken out.
Catching them on the PDF set kept that work in the drawings. The rest of the 286 issues were smaller coordination items on the same pages.
CD went out with the support detail, the electrical clearance, and a pad that matched the generator.
“The 5,000-lb condenser had no steel under it, the condensing unit fought the electrical gear, and the generator pad was too small. Those are $50,000 to $300,000 change orders if they wait for the field.”
Frequently asked questions
What did the Nashville hotel check cover?
Roof equipment support, the condensing-unit electrical conflict, and the emergency-generator pad, plus the rest of the coordination list on the PDF set.
How many issues were on the set?
286 issues on 372 pages, across two Nashville hotels.
What do those three findings cost in the field?
The owner's rep priced each one as a $50,000 to $300,000 change order if it is found after the equipment is set.
How is this different from the Charleston hotel story?
Nashville was a roof condenser, a condensing-unit electrical conflict, and an undersized generator pad. Charleston was ducts in the wrong bay and rooms the schedule counted that the plan did not draw.
Milind Sagaram
Co-founder & CEO, HelonicMilind is the co-founder and CEO of Helonic, where he leads product and go-to-market for AI-powered construction drawing analysis. He works closely with general contractors, project managers, estimators, and owners to understand how drawing quality drives project outcomes - and where AI can reduce RFIs, change orders, and rework. Milind has interviewed hundreds of construction professionals across project delivery roles, from preconstruction estimators at ENR top-400 contractors to facilities directors at institutional owners, and uses those conversations to shape both product direction and the way Helonic talks about the work.
- Construction project delivery and preconstruction
- RFI and change order economics
- Owner and GC workflows for drawing QA/QC
- Estimating risk and bid-stage scope assessment
How this page was researched: Reviewed against Helonic's 2026 drawing-analysis categories, RFI workflow, and product capabilities.
Last reviewed by Milind Sagaram · September 20, 2026