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Treads shall have an unobstructed horizontal depth of not less than 11 inches (279 mm).
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R311.7.11.1 Building Planning, Treads of Alternating Tread Devices
edges of adjacent treads. The riser height and tread depth provided shall result in an angle of ascent from the horizontal of between 50 and 70 degrees ...
R311.7.11.1 Building Planning, Treads of Alternating Tread Devices
edges of adjacent treads. The riser height and tread depth provided shall result in an angle of ascent from the horizontal of between 50 and 70 degrees ...
1011.14.2 Means of Egress, Treads of Alternating Tread Devices
tread width of 7 inches (178 mm) and a maximum riser height of 91/2 inches (241 mm). The tread depth shall be measured horizontally between ...