Code
Dimensions of stair treads for other types of stairs shall conform to requirements of
1) MAHC Table 4.5.4.5,
2) MAHC Figure 4.5.4.5.1,
3) MAHC Figure 4.5.4.5.2, and
4) MAHC Figure 4.5.4.5.3.
Table 4.5.4.5: Required Dimensions for Stair Treads and Risers
DimensionsT-1 StandardT-1 Convex, Concave, TriangularT-2W-1H-1Minimum12 inches
(30.5 cm)21 inches
(53.3 cm)12 inches
(30.5 cm)24 inches
(61.0 cm)6 inches
(15.2 cm)Maximum18 inches
(45.7 cm)24 inches
(61.0 cm)16 inches
(40.6 cm)N/A12 inches
(30.5 cm)
Figure 4.5.4.5.1: Stair Treads and Risers
Figure 4.5.4.5.2: Stair Treads
Figure 4.5.4.5.3: Unique Stair Treads
Annex
Dimensions of stair treads for other types of stairs should conform to requirements of
* MAHC Table 4.5.4.5,
* MAHC Figure 4.5.4.5.1,
* MAHC Figure 4.5.4.5.2, and
* MAHC Figure 4.5.4.5.3.
Table 4.5.4.5: Required Dimensions for Stair Treads and Risers
Dimensions
T-1 Standard
T-1 Convex, Concave, Triangular
T-2
W-1
H-1
Minimum
12 inches
(30.5 cm)
21 inches
(53.3 cm)
12 inches
(30.5 cm)
24 inches
(61.0 cm)
6 inches
(15.2 cm)
Maximum
18 inches
(45.7 cm)
24 inches
(61.0 cm)
16 inches
(40.6 cm)
N/A
12 inches
(30.5 cm)
Figure 4.5.4.5.1: Stair Treads and Risers
Figure 4.5.4.5.2: Stair Treads
4.5.4.5.3: Unique Stair Treads