Ibc Stairway Roof

Handrail height measured above stair tread nosing s or finish surface of ramp slope shall be uniform not less than 34 and not more than 38.

Ibc stairway roof.

Stair riser heights shall be 7 inches 178mm maximum and 4 inches 102mm minimum. Stairway rise ibc 1011 8 every 12 feet of vertical rise the stairway must have a landing. According to the ibc stairways with an occupant load of fewer than 50 people must be at least 36 inches wide. Note that when looking for commercial stair standards one must look at the international building code ibc.

Stairs that are higher than 12 feet tall require an intermediate landing in the middle of the stairway. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. These landings should be the same width as the stairway and extend at least three feet in length. Walking surface ibc 1011 7 1 the slope of the walking surface cannot be greater than 1 48 in any direction.

Rectangular tread depths shall be 11 inches 279 mm minimum measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread s nosing. The riser height shall be measured vertically between the nosing s of adjacent treads. Often the same roof access is accomplished from the highest stairway landing by means of a ladder and scuttle hatch. In buildings four or more stories or more than 40 feet 12 192 mm in height above grade one stairway shall extend to the roof surface through a stairway bulkhead complying with section 1509 2 unless the roof has a slope steeper than 20 degrees 0 35 rad.

Access to setback roof areas may be through a door or window opening to the roof. The only apparent purpose of the stair is not to provide a means of egress to the roof level but to provide access to the roof for the maintenance of equipment.