Operable windows >72 in above outside grade w/ sill <24 in above floor: opening control device required
2025 RCNYS §R321.2 Window fall protectionDescription
Where an operable window's clear opening is less than 24 in above the finished floor AND more than 72 in above the outside grade or surface, the window must either (a) not allow a 4-in sphere through at its largest opening, or (b) be fitted with an ASTM F2090 opening control device or fall-prevention device. When the window also serves as an emergency egress, releasing the control device must restore the full clear opening area required by R319.
Why this exists
Children fall out of operable windows every year. The 24 in / 72 in trigger captures most upper-story bedroom windows. Architects should default to ASTM F2090 opening-control hardware on every upper-story window — the cost is minimal and the egress is preserved.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
sillTrigger | max | 24 | in | Sill height above floor below which protection required |
gradeTrigger | min | 72 | in | Exterior grade drop above which protection required |
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
Last reviewed 2026-05-15.