Proactive Audit — Codex (David)
Compiled after reading the Barndo LDD set, Claude's proactive audit, the watercooler, and current public code/research anchors. This is not a replacement for licensed design review. It is a pre-bid risk-control plan: questions to force into writing before the project turns into steel, slab, and invoices.
Executive take
I score the packet 7.8 / 10 today, slightly above Claude's 7.5, but not because the design is magically closer to finished. My rubric weights decision discipline and testability higher than Claude's. The design has unusually strong rules, clean geometry, and explicit operating priorities. The missing piece is not more taste. It is a permit/commissioning/control matrix that makes the AHJ, engineers, GC, and owner prove the same version of the building.
Path to 8.5
AHJ code basis in writing · fire/life-safety separation plan · egress and rescue audit · moisture/condensation control sequence · MEP commissioning requirements · GC bid alternates tied to real choices.1. Missing master document: code basis + AHJ decision log
The project asks many good AHJ questions, but it still needs one controlled document that says which code family governs which subsystem.
- New Castle County adopted the 2024 IBC + IRC effective January 1, 2026 (per NCC Code Chapter 6). The set previously assumed Sussex County's 2021 IBC/IRC; that was an error — see Location details.
- Delaware plumbing is state-administered around the 2021 IPC with state amendments.
- Delaware energy guidance still points builders to the 2018 IECC / ASHRAE 90.1-2016 baseline while also publishing 2021 IECC change materials.
- The building mixes dwelling, ILS, gym, workshop, garage, storage, material movement, and Asgard Press operations. That may land cleanly as residential with accessory uses, but it should not be left to a plan-review surprise.
| Item | Owner | Required written answer |
|---|---|---|
| AHJ | David / Peter | County, municipality if applicable, floodplain administrator |
| Building code | AHJ | IRC vs IBC basis, occupancy classification, accessory-use treatment |
| Sprinkler trigger | AHJ | Explicit yes/no and why |
| Garage/workshop separation | Architect / AHJ | Required separations, protected openings, penetrations |
| Kitchen ventilation | AHJ / Mechanical | Residential hood vs commercial Type I, makeup-air trigger, inspection path |
| Plumbing code | Plumbing designer | 2021 Delaware Plumbing Code / IPC amendments and permit path |
| Energy code | Energy reviewer | Applicable IECC/ASHRAE path, blower-door target, ventilation standard |
| Electrical code | Electrical engineer | NEC edition and utility service constraints |
Codex opinion: if this document is missing, every "locked" LDD is only emotionally locked. Claude can keep the chair emoji; this is the chair the project actually needs to sit in.
2. Fire separation is under-owned
The south bay is not just a garage in the everyday sense. It is garage + workshop + inventory movement + possible equipment storage next to a residence. That does not make the design wrong, but it makes the separation strategy a first-order drawing issue.
Lock before bidding
Garage/workshop to dwelling assemblies · door ratings and smoke/CO sealing · penetrations for lift, ducts, conduits, plumbing, and low-voltage · whether the material lift creates a protected shaft or special opening condition · CO detection strategy · battery/PV/inverter room separation if batteries enter the project.Action: create a one-page Fire + Separation Plan before bidding. It should be drawn over the first-floor plan, not described in prose. Every opening between south bay, living, ILS, mechanical, and upstairs should have a tag.
3. Egress and rescue openings need their own audit
The packet has strong big-picture circulation, but I did not see a systematic egress/rescue matrix for BR3, BR4, ILS bedrooms, the UCR, stair geometry, exterior thresholds, and emergency access around the footprint.
| Space | Sleeping? | Rescue opening / exit path | Threshold | Notes |
|---|---|---|---|---|
| ILS bedroom 1 | yes | TBD | zero-step required | confirm window/door dimensions |
| BR3 | yes | TBD | stair-dependent | confirm rescue opening and sill height |
| BR4 | yes | TBD | stair-dependent | confirm rescue opening and sill height |
| UCR | maybe | TBD | stair-dependent | decide if it can become sleeping space |
| South bay | no | overhead/service doors | slab/apron | confirm person-door path |
Codex opinion: the aging-in-place score should not move above 7.5 until this matrix exists. A flush spine threshold is good. A whole-building threshold audit is better.
4. Moisture control needs a sequence
IMP can be an excellent wall/roof strategy, but metal buildings punish vague vapor control. The documents mention airtightness and IMP logic, but the sequence needs to be explicit: humidity range, dehumidification during shoulder seasons, ERV frost/defrost behavior, steel penetration condensation risk, blower-door timing, and smoke/thermal testing before finishes hide leaks.
Add to LDD-11
- Pre-IMP: verify all penetrations are planned, not field-routed.
- Post-IMP / pre-finish: blower-door test and smoke pencil on major joints.
- Pre-occupancy: HVAC dehumidification test during low-load conditions.
- Owner manual: humidity setpoints, filter changes, ERV maintenance, condensation watch points.
This is where the metal-shell choice either becomes elegant or becomes a lifetime of "why is that joint sweating?"
5. Kitchen ventilation needs acceptance criteria
Claude is right that the mockup matters. I would make the mockup less theatrical and more contractual. The problem is not just "does smoke look contained?" The problem is "what pass/fail criteria tells the owner, mechanical designer, and GC that the design is approved?"
- actual cooktop/griddle geometry or a true dimensional surrogate
- capture height at 8' AFF
- target exhaust CFM range and noise reading at seated/standing positions
- makeup-air path active during test
- smoke pen plus real grease/smoke cooking load
- visible escape limit at perimeter of capture zone
- odor migration check 30 minutes after shutdown
- cleaning access test for filters, duct entry, and grease surfaces
Codex position: split ERV + dedicated MUA is operationally cleaner. A dual-duty ERV can be defended only if the manufacturer-published boost airflow, controls, defrost behavior, and service access are all documented. "Elegant" is not a CFM rating.
6. Budget needs bid alternates
The budget analysis has useful ranges, but the next document should be written in a form a GC can price directly.
| Alternate | Base bid | Add/deduct | Decision owner |
|---|---|---|---|
| Exterior IMP finish | SMP | PVDF/Kynar upgrade | David/Peter |
| ERV/MUA | split ERV + MUA | dual-duty high-CFM ERV | Mechanical |
| Upstairs radiant | dry panel | gypcrete | Peter |
| Lift | rough-in only | install material lift | Peter |
| Solar | conduit + panel capacity | full 30kW PV + inverter | David/Peter |
| Lighting controls | consolidated low-voltage | premium scene package | David |
| BBQ vent | mockup-approved custom | conventional hood fallback | Peter/David |
This turns the $120K vs $480K argument into priced choices. Until then, everyone is just doing arithmetic with different levels of confidence and swagger.
7. Commissioning should be a deliverable
This building has too many integrated systems to treat final inspection as completion.
- radiant loop map, pressure test, and manifold labels
- HVAC balancing report by zone
- ERV/MUA airflow measurements
- BBQ capture test results
- lighting scene file and driver map
- electrical panel schedule with spare capacity notes
- PV/battery/generator readiness diagram
- plumbing shutoff map
- lift service manual and vendor contact
- photo archive keyed to LDD numbers
- owner maintenance calendar
Action: add LDD-26 Commissioning + Owner Manual. Require it in the GC scope. Pay retainage against it.
8. One design push: protect a future first-floor sleeping suite
This is a 30+ year building. The ILS is part of the premise, but the main family side should also preserve a future first-floor sleeping option that does not depend on stairs or the lift.
Optionality rule
Pick one first-floor room or zone that can become a private sleeping suite later. Confirm nearby full bath or convertible bath, zero-step exterior path, privacy from gym/social counter, rescue opening or compliant exit, and acoustic separation from south bay and gym.Research anchors used
- NCC Code of Ordinances · Chapter 6 (Building Code) — adopted IBC/IRC versions + local amendments
- NCC Permits & Inspections — AHJ contact + ePlans/eApply submission portals
- FEMA Map Service Center
- FEMA flood map FAQ and BFE guidance
- Delaware Plumbing Code / 2021 IPC adoption
- DNREC building energy codes
- ICC 2021 IRC mechanical proposal text, M1503.6
- ASHRAE 62.2-2022 Addendum l
Net effect
If the project adds the code-basis log, fire plan, egress/zero-step matrix, bid alternates, and commissioning LDD, I would move it from 7.8 to 8.4 before bids. With stamped engineering, AHJ classification in writing, and line-item GC bids, it can credibly reach 8.7-9.0.
Without those, it is a highly disciplined design package with several unresolved institutional risks. Pretty good. Not immortal.