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// CODE SNIPPET

1009.4.5 Profile

Building Code 2009 of Alabama > 10 Means of Egress > 1009 Stairways > 1009.4 Stair Treads and Risers > 1009.4.5 Profile
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The radius of curvature at the leading edge of the tread shall be not greater than 9/16 inch (14.3 mm). Beveling of nosings shall not exceed 9/16 inch (14.3 mm). Risers shall be solid and vertical or sloped under the tread above from the underside of the nosing above at an angle not more than 30 degrees (0.52 rad) from the vertical. The leading edge (nosings) of treads shall project not more than 11/4 inches (32 mm) beyond the tread below and all projections of the leading edges shall be of uniform size, including the leading edge of the floor at the top of a flight.
Exceptions:
  1. Solid risers are not required for stairways that are not required to comply with Section 1007.3, provided that the opening between treads does not permit the passage of a sphere with a diameter of 4 inches (102 mm).
  2. Solid risers are not required for occupancies in Group I-3 or in Group F, H and S occupancies other than areas accessible to the public. There are no restrictions on the size of the opening in the riser.
  3. Solid risers are not required for spiral stairways constructed in accordance with Section 1009.9.
  4. Solid risers are not required for alternating tread devices constructed in accordance with Section 1009.10.

Related Code Sections


1009.4.5 Means of Egress, Profile
The radius of curvature at the leading edge of the tread shall be not greater than 9 / 16 inch (14.3 mm). Beveling of nosings shall not exceed 9 ...
Fire Code 2009 of Alabama > 10 Means of Egress > 1009 Stairways > 1009.4 Stair Treads and Risers > 1009.4.5 Profile
1009.4.5 Means of Egress, Profile
The radius of curvature at the leading edge of the tread shall be not greater than 9 / 16 inch (14.3 mm). Beveling of nosings shall not exceed 9 ...
Building Code 2009 of Alabama > 10 Means of Egress > 1009 Stairways > 1009.4 Stair Treads and Risers > 1009.4.5 Profile
1029.13.2.4 Means of Egress, Nosing and Profile
Nosing and riser profile shall comply with Sections 1011.5.5 through 1011.5.5.3 ...
Building Code 2015 of Alabama > 10 Means of Egress > 1029 Assembly > 1029.13 Assembly Aisle Walking Surfaces > 1029.13.2 Stepped Aisles > 1029.13.2.4 Nosing and Profile
1029.13.2.4 Means of Egress, Nosing and Profile
Nosing and riser profile shall comply with Sections 1011.5.5 through 1011.5.5.3 ...
Fire Code 2015 of Alabama > 10 Means of Egress > 1029 Assembly > 1029.13 Assembly Aisle Walking Surfaces > 1029.13.2 Stepped Aisles > 1029.13.2.4 Nosing and Profile
1030.14.2.4 Means of Egress, Nosing and Profile
Nosing and riser profile shall comply with Sections 1011.5.5 through 1011.5.5.3 ...
Building Code 2021 of Alabama > 10 Means of Egress > 1030 Assembly > 1030.14 Assembly Aisle Walking Surfaces > 1030.14.2 Stepped Aisles > 1030.14.2.4 Nosing and Profile
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