Building Codes For Interior Stairs, Https Www Bchousing Org Publications Builder Insight 17 Bc Building Code Changes 2018 Pdf

Minimum 36 inch clear width for stairway.

Stairs guardrail ideas. Maximum 4 12 inch handrail projection into stairway width on either side. Stair tread depths shall be 11 inches 279 mm minimum. The riser measurements must be equal across an entire flight of stairs.

These are two model codes and are offered as suggested guidelines for local code authorities to follow at their discretion. 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. Therefore let us recap on the residential stair code requirements.

Distance from wall to ensure your hand has enough room to slide down the rail the rail must be at least 15 inches from the wall. 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. 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.

At the same time staircase code measurements do allow for some flexibility since most measurements are accompanied by minimums or maximums. As long as the 3 foot width standard is met you can expand the stairs width as far as you wish. So this basically sums up the basic code requirements for residential stairs and their dimensions.

1 interior stairs may be not less than thirty six inches wide when serving not more than thirty occupants per stair on any floor in buildings classified in occupancy groups j 1 and j 2 or when serving buildings classified in occupancy group j 3 and exceeding four stories in height or when serving not more than sixty occupants per stair on any floor in buildings classified in occupancy groups e b and d. International building code for stair treads and risers 10093 stair treads and risers. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum.

Staircase code states that stairs must be 3 feet wide or wider. Interior stairs shall be at least forty four inches wide except as follows. Irc stair railing code.

Summary of code requirements for residential stairs. The tallest riser cannot differ from the smallest by more than 037 inch. The international residential code for one and two family dwellings irc and the international building code ibc address staircase railings.

For residential stairs the code specifies the minimum stair head height stair width and landing dimensions as well as the maximum size of risers treads and handrails. Building codes protect the health safety and welfare of the homeowner.