Preqonn AI
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WALLS & CEILINGS · DIVISION 9

Every soffit, measured.
Every UL assembly, verified.

Preqonn AI reads the RCP, quantifies bulkheads, light coves, and stepped ceilings, then checks every rated floor/ceiling assembly against UL listings and MEP penetrations. Signed by a senior estimator.

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RCP · sections · UL refs SF flat + SF soffit + LF bulkhead Penetration BOM
SOFFIT · 412 SF STEPPED · 38 LF BLK LIGHT COVE · 64 LF UL L518 · 2-HR · 4 PEN LOBBY CONF OPEN OFFICE RATED CORRIDOR
Section 02 · Where bids leak

The four numbers nobody writes on the RCP.

A ceiling estimator runs takeoff against three plans at once: the RCP, the building section, and the life-safety plan. Then re-runs it on every addendum. This is where good ceiling bids die.

01 / SOFFIT GEOMETRY
The pain

Bulkheads and light coves don't exist as a single number on the drawings.

SF, LF, and framing live in the RCP, the section, and the lighting layout. You rebuild the geometry by hand. Stepped ceilings cost twice and one slip eats the margin.

Preqonn AI

Soffit geometry, quantified.

Reads the RCP against the section. Outputs SF of flat ceiling vs. SF of soffit, LF of bulkhead by height step, and framing BOM, all keyed to the same drawing reference.

02 / RATED ASSEMBLY
The pain

Treating a rated assembly as non-rated.

Missing the resilient channel, the second layer, or the UL-listed light fixture protection compromises the listing. The assembly fails inspection and the corridor stops rated.

Preqonn AI

UL listing verified per area.

Cross-checks the life-safety plan against the partition schedule. Flags every rated zone, names the UL number (L518, G540, etc.), and itemizes RC, second layer, and fixture protection in the BOM.

03 / MEP PENETRATIONS
The pain

Penetration count is the last thing anyone gets right.

Mechanical, electrical, plumbing, fire protection all puncture the rated ceiling. Coordinating firestop SKUs against the MEP plans is the most-skipped step before bid.

Preqonn AI

Every penetration counted, sized, sealed.

Overlays MEP penetrations onto the rated zone. Outputs a penetration count by size and trade, picks the UL-classified firestop system, and writes the priced firestopping BOM.

04 / ADDENDA
The pain

The RCP changes three times before bid day.

A new conference room means a new soffit, a new cove, two new light fixtures, and three new penetrations. The takeoff has to be redone, but it never is.

Preqonn AI

Re-quantified on every addendum.

Diffs the new RCP against the old. Updates SF, LF, framing, and penetration counts in place. Highlights what moved so your senior estimator can verify the delta in minutes.

Section 03 · The signature moment

From RCP outline to firestop BOM, in four passes.

Scroll. Watch the agent walk the same drawing a senior estimator walks. Geometry. Zones. Listings. Penetrations.

Signature moment

The agent walks the drawing before you do.

  1. 01RCP outline. Detects rooms, walls, ceiling heights.
  2. 02Ceiling zones. Color-codes flat, soffit, stepped, light cove.
  3. 03Rated assembly callouts. Names UL L518, L546, G540 per area.
  4. 04Penetrations + firestop BOM. Counts MEP punctures, picks UL system.
RCP READOUT STEP 2
Flat SF0
Soffit SF0
Bulkhead LF0
UL L546 corridor2-HR
Pen. count0
Firestop SKUs0
RATED CEILING SF / BID
0sf
Average rated horizontal-assembly square footage on a typical mid-rise commercial bid. UL-keyed, not guessed.
PENETRATIONS COORDINATED
0%
Of MEP penetrations through rated assemblies matched to a UL-classified firestop SKU. Coordinated, not implied.
RE-QUANT ON ADDENDA
minutes
Time to re-quantify SF, LF, framing, and penetrations against a new RCP revision. Not days.
Section 05 · What the AI auto-checks

Every rated ceiling, traced back to the listing.

Code citations on every assembly. Section, paragraph, listing number. Your inspector won't ask twice.

UL Fire-Resistance Directory L-, G-, and D-series floor/ceiling listings matched to plan, with required gypsum layers, RC, and fixture protection itemized.
UL L501 · L518 · L546
ASTM C645 / C754 Cold-formed steel framing for nonstructural members. Stud gauge, spacing, and member sizes auto-derived from the partition schedule.
ASTM C645 · C754
GA-216 Application & Finishing Gypsum Association recommended specifications, including levels of finish (L1–L5) per room function and lighting.
GA-216-2024
IBC §711 Floor/Ceiling Assemblies Horizontal-assembly fire-resistance per occupancy and construction type, cross-referenced against the life-safety plan.
IBC §711.2 · §711.3
ASTM E119 Fire Tests Test method for building construction and materials. Every called-out assembly traced to a tested system, not a generic rating.
ASTM E119
IBC §714 Penetrations F- and T-rated penetration firestopping for MEP passing through rated horizontal assemblies. UL-classified systems only.
IBC §714.4 · ASTM E814
Section 06 · FAQ

The questions before the demo.

The four things every ceiling estimator asks on the first call.

Yes. The agent cross-references the RCP, the building section, and the ceiling-height schedule. Soffit and bulkhead boundaries come from the RCP, vertical face heights come from the section, and the framing BOM is derived from both. We output SF flat, SF soffit, LF bulkhead by height step, and a framing BOM.
The full UL Fire-Resistance Directory is indexed. When the plan calls a non-standard listing, the agent surfaces the listing detail with required components (layers, RC, fixture protection, fastener pattern) and flags any missing detail in the partition schedule. Your senior estimator gets the listing summary, not a guess.
Penetrations are pulled from the MEP plans, not assumed from the architectural set. The agent overlays mechanical, electrical, plumbing, and fire-protection layers onto every rated horizontal assembly and outputs penetration count by size and trade. Each one gets a UL-classified firestop system match for the priced BOM.
Drop the new addendum in. The agent diffs the new RCP against the previous version, updates SF, LF, framing, and penetration counts in place, and highlights only what moved. Your senior estimator verifies the delta. No re-running the whole takeoff.
Try it

See it work on your live RCP.

20-minute demo. Bring a real RCP and partition schedule. We'll run it through Preqonn AI and walk the output, line by line.

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Bring a real PDF Output stays yours 20-minute walkthrough
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