Daily Code Talk #29 — IMC 306: Roof / Elevated Access (Part 3)

Refs: IMC 306.5–306.5.2; IBC (guards/platforms); NFPA 70.🧠 Plain English Highlights•306.5 Trigger: If reaching the unit means climbing higher than 16 ft above grade, provide a fixed interior/exterior access. No portable ladders. Route cannot require going over obstructions taller than 30 in or walking on roofs steeper than 4:12.•Fixed ladder (key dims): Rails 42 in above roof/hatch/landing; rungs 10–14 in o.c.; top rung ≤24 in below roof/hatch/parapet; toe space 7–12 in; rail spacing ≥16 in; rung ≥3/4 in dia, 300-lb load. Climbs >30 ft:offset sections + landings (≥18 in and ≥ ladder width, 100 psf, with guards). Clearances:30 in climbing clearance from rung centerline; 15 in clear each side; bottom landing 30×30; top landing 30 in deep (hatch width).•Catwalks: ≥24 in wide with rails (service-platform criteria).•Exception: Group R-3 occupancies are exempt from 306.5.•306.5.1 Sloped roofs: For roofs 3:12 or steeper with edges >30 in above grade, provide a level platform on each serviced side (≥30 in any direction) with 42 in guards (21-in sphere rule; IBC loading). Do not require walking on roofs steeper than 4:12. Obstructions >30 in along the path require a code ladder or IBC stair.•306.5.2 Electrical: Provide a receptacle at or near the equipment per NFPA 70.🏗️ Why It MattersNoncompliant ladders, missing landings/guards, or no service receptacle are fast inspection holds and fall-risk liabilities. Coordinating ladder type, landings, parapets, and power early avoids rework at TCO.🧾 Where To Show It (sheet map)•M-001: “Roof/elevated access per IMC 306.5; no portable ladders; no route over obstructions >30 in; no walking on slopes >4:12. Fixed ladder and landing dimensions as scheduled; catwalks 24 in min; receptacle per NFPA 70.”•M-101/…: Plot access path, ladder location, 30×30 bottom landing, 30-in-deep top landing, catwalk widths, sloped-roof platforms, and nearest service receptacle.•M-501/502: Fixed-ladder detail (rails/rungs/clearances), parapet walk-through, offset landing (>30 ft climbs), 30-in platform with 42-in guards for 3:12+ roofs, catwalk section, receptacle note.•M-601: Columns: Access Type | Climb Height (ft) | Ladder Spec | Landings (Y/N, size) | Catwalk (in) | Platform/Guards (Y/N) | Receptacle (Y/N).🔧 Quick Field TipPlace the hatch so the top rung is within 24 in of the step-off; verify 30 in climbing clearance and the 30×30 bottom landing. On 3:12+ roofs, draw the 30-in platforms with 42-in guards at each service side. Tag the service receptacle on the roof plan.Comment “IMC306” for the Roof/Elevated Access Kit (ladder/landing checklist, sloped-roof platform detail, receptacle note).DM “ADVISORY” for a quick plan-review sweep.