![]() Notwithstanding subsection 1 of Section 9.8.4.3. the stairway serves not more than 2 dwelling units per floor area.Ģ9.4.the stairway serves only dwelling units.of Division B of the Code, where a dwelling unit has 2 or more means of egress, one of the means of egress may be an exterior stairway with a minimum clear width of 760 mm, provided that: Notwithstanding subsection 1 of section 9.8.2.1. Rotatable in its entirety or be rotatable in one or more parts whereĮach rotating part permits rotation of at least 180 degrees.Ģ9.3. ![]() of Divisionī of the Code, a spiral staircase authorized under paragraph 3 or 4 of the rotation between 2 levels is in the same direction.Ģ9.2.it has equal treads of not less than 225 mm when measured at 500 mm from the narrowest end.it serves not more than 2 dwelling units per.it serves a level not more than one story above.Is not their only means of egress may turnin its entirety or turn in one or more parts if: of Divisionī of the Code, an exterior stairway that serves only dwelling units and Anywhere else in Canada - including in Laval and Brossard (directly adjacent to Montreal) - such designs are not permitted and municipalities do not have the legal authority to create an exemption from the provincial building codes that prohibit them.Ģ9.1. Modern infill projects, like ‘Les Quatres Arbres’ at 4878 Avenue Henri-Julien in the Plateau neighbourhood, are feasible precisely because of this particular code exception. The economy of scale that results from this exception to the building code is one of the reasons why Montreal’s density and mix of housing options is so distinct within Canada. ![]() However, Article 29 of Montreal bylaw 11-018 includes an exception to the National Building Code to allow for tight-radius spiral stairs as a shared means of egress for two dwelling units per storey in buildings of up to three storeys. The National Building Code requires any curved or spiral stair that serves more than one dwelling unit to have “an inside radius that is not less than twice the stair width,” which translates to such stairs being so inefficient as a measure of floor area that they are only used for monumental and processional spaces like a theatre or grand entrance. The “Montreal triplex” is a form of missing-middle housing made possible by these powers: it consists of three or more stacked dwelling units that share a curved exterior staircase on the front and a spiral stair at the rear of the building. ![]() If you have doubts, please contact your local building authority.An exception in North America, Montreal offers an alternative history of medium-density housing encouraged by the city’s distinct regulations allowing curved and spiral stairs to serve as exits.Īlong with Saint John, Winnipeg, Vancouver, and Lloydminster, Montreal is one of the few chartered cities in Canada with the power to draft municipal bylaws that contravene provincial and federal regulations. IMPORTANT: It is your responsibility to ensure that spiral staircase, handrail and landing banister are safe. The individual tread rises measures no more than 22 cm.ģ) Spiral staircases may also need a minimum clear stair width of 60 cm.Īll these aspects covered are just guidance and it will be the decision of the building inspectors to judge whether your spiral stair meets the regulations. Riser bars (child guards) can be fitted between the treads to reduce these gaps.Ģ) It is also essential that all steps/treads have the same rise. ![]() To avoid the gaps of more than 10 cm e.g., in-between treads. This means that at no point there is a gap bigger than 99mm between the balusters or the individual treads. A spiral staircase must live up to the following regulations.ġ) 100mm sphere gap rule. Yes, spiral staircase are legal in the UK as long they live up to the regulations in the UK Building Regulation for primary use. Spiral staircases are very popular in the UK, not just for loft conversion. ![]()
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