Interior Stairs Building Code, Building Regulations Explained

Measure railing height from the bottom of the ground at each step to the top of where the handrail will be located.

Spiral staircase design plan. The ontario building code stairs 3475. Codes require railings against a wall to be between 30 inches and 38 inches high while handrails on open stairs must be 34 to 38 inches high. Maximum 4 12 inch handrail projection into stairway width on either side.

So this basically sums up the basic code requirements for residential stairs and their dimensions. The michigan residential building code specifies that a riser be a maximum height of 825 inches as measured vertically between the leading edges of the adjacent treads. Stair railing guardrail handrail landing platform building design build specifications.

Michigans residential building code for interior stair risers by aurelio locsin. The amendment also reduces the maximum rise for stairs from 200 mm to 180 mm. A new provision has been added to the tread and riser requirements to restrict open stair risers.

Staircase code states that stairs must be 3 feet wide or wider. Summaries of stair and railing code design specifications quoted from model building codes. A prime example is the standard stair width.

The riser measurements must be equal across an entire flight of stairs. This article series lists all major building code specifications for stairs railings. Stairs 1 stairs shall be inclined at an angle of not more than 450 with the horizontal and their steps shall have risers not more than 210 mm high and treads not less than 220 mm wide exclusive of nosing.

The international residential code for one and two family dwellings irc and the international building code ibc address staircase railings. The capacity of interior stairs shall be as listed in table 6 1. Stair tread depths shall be 11 inches 279 mm minimum.

At the same time staircase code measurements do allow for some flexibility since most measurements are accompanied by minimums or maximums. Uprogressdanapolicystair treadsinternational building code stair treads and risersdoc 06232014 international building code for stair treads and risers 10093 stair treads and risers. Interior stairs shall comply with the following requirements.

Therefore let us recap on the residential stair code requirements. Nyc building code 2008 8 interior finishes 804 interior floor finish 8045 interior floor finish limitations. 1008187 means of egress stairway doors.

These are two model codes and are offered as suggested guidelines for local code authorities to follow at their discretion. Minimum 36 inch clear width for stairway. As long as the 3 foot width standard is met you can expand the stairs width as far as you wish.

Irc stair railing code. This article was revised to clarify the permitted stair configurations for part 3 building exit stairs. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum.

2 stairway headroom shall be not less than 1 950 mm plus the height of one riser measured vertically above the nosing of any tread or platform.