Exterior Stair Riser Height Code
Stair Riser Height.
Exterior stair riser height code. - The stair treads should be at least 36 inches wide. Commercial Stair Riser Height. There is currently no specified minimum width in the Building Code.
Minimum 130mm maximum 225mm. Maximum Height of Stairs 1The vertical height of any flight of stairs shall not exceed 37 m. Note that dimensions here should be taken excluding carpets rugs or runners.
The International Building Code sets the commercial building code for stairs. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum. All rises R and all goings G in the same flight of stairs shall be of uniform dimensions within a tolerance of -5mm.
2018 IRC code for exterior stairs. The 2018 IRC code for exterior stairs is found in Section R311 Means of Egress. The largest tread width or riser height in any flight of stairs shall not exceed the smallest by more than 38 inch.
IBC 101110 requires that spiral stair riser height shall not be more than 9 12 inches 241 mm. International Building Code for Stair treads and risers 10093 Stair treads and risers. Each situation has unique conditions so please call or visit the Development Services Center with any questions.
Step riser nosing 1. Any variation of risers within a flight of stairs should not be more than ⅜ inch of tolerance. This quote is from he CBC 100333 Stairways and Landings model code.