02/12/2014 I received an email today from an individual who’s contractor had built an exterior concrete stair for them. Each tread sloped 3/4″ down from back to front. I quickly emailed them back to let them know that isn’t up to code and in fact is quite dangerous. If those treads …
10/01/2014 For outdoor stairways treads must be slightly sloped so water will not accumulate on the stairs. Install a 1% slope (1/8 inch per foot) to ensure water runoff but do not exceed the maximum allowable slope of 2% (1/4 inch per foot) in any direction. Tread slopes can be sloped either to the front back or perpendicular to the direction of travel.
13/03/2021 Exterior stair treads must comply with all the general stair tread requirements found in IBC section 1011.5 Stair treads and risers. The minimum tread depth shall be 11 inches. Additionally as a part of an outdoor stair walking surface exterior stair treads must also comply with IBC Section 1011.7.2 for stair walking surface for outdoor use.
Normally a stairway walking surface for treads and landings is expected to be close to level. R311.5.3 excerpt from Treads Risers: The walking surface of treads and landings of a stairway shall be sloped no steeper than one unit vertical in 48 units horizontal (2% slope).
mm) minimum. Stair tread depths shall be 11 inches (279 mm) minimum. The riser height shall be measured vertically between the leading edges of adjacent treads. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’s leading edge.
31/12/2011 A nosing is not required where the tread depth is a minimum of 11 inches (279 mm). From: http://publicecodes.citation.com/icod/irc/2009/icod_irc_2009_3_sec011_par012.htm R311.7.6 Stairway walking surface. The walking surface of treads and landings of stairways shall be sloped no steeper than one unit vertical in 48 inches horizontal (2-percent slope).
08/01/2021 For treads and riser of alternating tread stairs OSHA requires that alternating tread stairs have a series of treads installed at a slope of 50 to 70 degrees from the horizontal and that they have a minimum tread depth of 8.5 inches (22 cm).
Stairway Slope or Angle Stair Tread Slope Allowed Recommended Code-Specified Stairway Angle or Slope Stair codes and guidelines prefer an angle of around 37° for normal stairways (the green area in our illustration) and around 7° for ramps (the yellow area in our illustration).
28/03/2017 The standard acceptable range of dimensions for exterior Treads is 11 to 18 inches. In order to provide the most ergonomic flow Tread length should be determined based on the following formula whenever possible: