Rooftop PV: structural design for snow + dead, fire classification matches roof, emergency-access pathways

Description

Rooftop-mounted PV systems must be structurally designed to support: (1) panel dead load + snow load (Table R301.2), and (2) panel-removed dead load + roof live or snow load whichever is greater. PV systems must match the roof's fire classification (Section R902). Roof penetrations must be flashed + sealed per Chapter 9. Emergency-access pathways and setbacks are required so the fire service can cut access if the building is on fire (R329.6).

Why this exists

PV is now common enough that the structural + fire-service implications must be part of every roof design. Architects specifying PV should coordinate with the structural engineer on the snow + PV load case AND with the roofing spec on a Class-A-compatible PV system.

Categories

Applies to

• Jurisdiction: New York State

Source

Solver enforcement

Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.

Related directives

• Garage / dwelling fire separation · IRC R302.6
• Habitable space minimum ceiling height · IRC R305.1
• Egress window net opening dimensions · IRC R310.2
• Stair riser, tread, and headroom · IRC R311.7
• Smoke alarms required throughout dwelling · IRC R314