9.8.2. Stair Dimensions

9.8.2. Stair Dimensions
9.8.2.1. Stair Width
  1. Except as provided in Sentence (2) and Article 9.8.4.7., required exit stairs and public stairs serving buildings of residential occupancy shall have a width of not less than 900 mm.
  2. Exit stairs serving a single dwelling unit or a house with a secondary suite including their common spaces shall have a width of not less than 860 mm.
  3. Except as provided in Article 9.8.4.7., required exit stairs and public stairs serving buildings of other than residential occupancy shall have a width of not less than the greater of
    1. 900 mm, or
    2. 8 mm per person based on the occupant load limits specified in Table 3.1.17.1.
  4. Except as provided in Article 9.8.4.7., at least one stair between each floor level within a dwelling unit, and exterior stairs serving a single dwelling unit except required exit stairs, shall have a width of not less than 860 mm.
9.8.2.2. Height over Stairs
  1. The clear height over stairs shall be measured vertically, over the clear width of the stair, from a straight line tangent to the tread and landing nosings to the lowest point above. (See Note A-3.4.3.4.)
  2. Except as provided in Sentences (3) and (4) and Article 9.8.4.7., the clear height over stairs shall not be less than 2 050 mm.
  3. Except as provided in Article 9.8.4.7., the clear height over stairs serving a single dwelling unit or a house with a secondary suite including their common spaces shall not be less than 1 950 mm.
  4. The clear height over stairs that are located under beams and ducting in secondary suites shall not be less than 1 850 mm.

Previous page
« 9.8.1. Application

Next page
9.8.3. Stair Configurations »