Repair, Wind, Flood, Rodentproofing, Seismic (301.14-301.18)
Plain English:
301.14 Repair-Fix/replace so the original listing/approval stays intact. No field mods that void MI.
301.15 Wind-Rooftop/yard gear + supports must resist IBC wind pressures (overturning/uplift/sliding).
301.16 Flood-In flood zones, place mechanical systems at/above the design flood elevation (DFE). If below DFE, they must resist water entry, buoyancy, and hydrostatic/hydrodynamic loads.
301.16.1 Coastal-Don't mount on or penetrate breakaway walls.
301.17 Rodent proofing-Seal buildings/penetrations to block entry (coord. with mechanical openings).
301.18 Seismic-Where seismic applies, supports/anchorage/bracing per IBC Ch.16.
On Plans: Why It Matters
Most late-cycle redlines on Chapter 3 are about lost listings during "repairs," missing wind/flood/seismic declarations, and unprotected openings. If the plan set doesn't show how the installed system meets the site hazards, reviewers pause.
Field Tip: Show It in the Mechanical Set
M-001 (General): "Repairs shall maintain original listing/approval per MI."
"Wind/flood/seismic design per project IBC criteria."
M-101/102... (Plans): Call out equipment elevations relative to FFE/DFE where applicable. Identify non-breakaway mounting locations in coastal zones.
M-501/502 (Details): Wind/seismic anchorage details (curb/rail bolt patterns, uplift clips, snubbers, limit cables); flood anchorage for tanks/equipment below DFE (anti-buoyancy calcs reference); penetration seals at walls/roofs to maintain rodent protection and water tightness. Include MI page refs so the listing isn't compromised.
M-601 (Schedules): Include Basis of Design, Model, Unit/Operating Weight, Mounting/Restraint Type, Location Elevation (flood check).
M-003 (Life Safety/Declarations): Note stating no mechanical equipment on/through breakaway walls in Coastal High-Hazard/Coastal A Zones (when applicable). "All exterior intakes/exhausts protected against pest entry; penetrations sealed."
Code Path: Wind, Flood, Seismic, and Repair Documentation
M-001 (General Notes): 'Repairs shall maintain original listing/approval per MI.' 'Wind/flood/seismic design per project IBC criteria.'
M-101/M-102 (Plans): Call out equipment elevations relative to FFE/DFE for flood zone equipment; identify rooftop equipment subject to IBC wind requirements.
M-501/M-502 (Details): Wind/seismic anchorage details with curb/rail bolt patterns, uplift clips, and snubbers referenced to IBC Ch. 16 and the project SE.
Check: 60-Second Plan-Review Sweep
Repair notes explicitly state "maintain listing/MI; no field mods that void certification."
Anchorage details align with IBC wind/seismic criteria.
Flood elevations/protection shown; coastal breakaway wall note present.
Schedules show weights/mounting/restraint; penetrations/intakes sealed and screened.
Review Risk:
Exposed equipment without the applicable wind-design basis, support reactions, and structural/anchorage coordination is incomplete where wind loads apply.
Mechanical equipment in a flood zone without elevation documentation relative to the design flood elevation (DFE) is a plan review and inspection risk.
Repairs that modify the equipment beyond the original listing/approval scope void the certification and require a new listing - flag any repair that changes capacity, fuel type, or installation configuration.
Masterbuild QA Lens
Wind, flood, and seismic are infrastructure-level risks - the reviewer sees them first on the site plan and structural notes, not the mechanical sheets. Confirm that rooftop equipment has IBC wind calculations or a structural engineer of record reference, flood-zone equipment is at or above the DFE shown on the civil drawings, and rodent-proofing is noted at all mechanical penetrations.
Drawing / Submittal Check
For 301.14-301.17: confirm the permit set shows (1) repair scope limited to preserving the original listing/approval - no field modifications that void MI noted on M-001; (2) IBC wind calculations or SE of record reference for rooftop equipment; (3) equipment elevation relative to DFE matching the civil drawings for flood-zone equipment; (4) penetration sealing notation at all mechanical openings for rodent proofing.
Common Review Risk
Wind, flood, seismic, and rodent-protection requirements cross several disciplines. Resolve equipment design loads and anchorage, flood elevation/protection, coastal breakaway-wall restrictions, and opening protection in the responsible project documents.
When To Escalate
Escalate when the project involves a change of occupancy that affects the mechanical system requirements - when a building that was a warehouse becomes a school, or when a residential building gains a commercial kitchen. Occupancy changes trigger mechanical system compliance requirements that can significantly increase the mechanical scope.
Load Assumption Check
Approved methods for mechanical systems must be backed by a calculation basis. Confirm that the load method - Manual J, ASHRAE, or equivalent - is stated on the drawings and that the selected method is appropriate for the building type.
Ventilation Coordination
For projects with occupancy changes (IMC 301 Part 3): confirm that the ventilation system for the new occupancy is sized to the new occupancy load and the new occupancy type - not carried over from the previous use. Occupancy changes that increase the occupant load or change the hazard classification frequently require ventilation upgrades that are discovered late when they should have been identified at the outset.