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Tag group keeps minimum half‑hour corridor and 20‑foot maximum travel recommendation for single‑exit units
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Summary
The council endorsed retaining a minimum one‑half‑hour fire‑resistance rating for exit access corridors in single‑exit residential buildings and reaffirmed a recommended 20‑foot maximum travel distance from unit door to stair to limit exposure during egress.
Tag group members said they would require a minimum 1/2‑hour fire‑resistance rating for exit access corridors serving single‑exit R‑2 buildings, instead of permitting a reduction to zero in some sprinkled buildings under base code. The change was described as an enhancement to protect the single stair and help ensure a protected path from units to the stair.
John noted that model code Table 1020.2 and related footnotes allow reductions for certain sprinklered conditions but the proposal would standardize a half‑hour corridor for the single‑exit allowance. ‘‘That is saying that you should always have at least a half hour rated corridor where the model code would allow you to go to 0,’’ he said.
On travel distance, the group discussed a 20‑foot maximum from a unit door to the stair. Members said the shorter dead‑end travel distance reduces exposure time while egress begins and that 20 feet is based on legacy code language; some members asked whether typical stair landings and switchback stairs would make the limit too restrictive for certain designs. No change was made; the 20‑foot figure remains highlighted as accepted for the draft.
