61. The total area of glazing, including glass for doors and skylights, that separates heated space from unheated space or the exterior must meet one of the following requirements:
(1) in the case of a residential occupancy building of 2 storeys or less or of a building comprising 8 dwelling units or less, it must not exceed 15% of the floor area;
(2) in the case of any other building, it must not exceed either 15% of the floor area or 40% of the total area of the walls separating the heated space of a storey from the unheated space or outside air, and of the party walls.
For the purposes of this section, these percentages may be considered as a whole for all storeys of a building from the ground up.
For the purposes of this section, the area of a sloping wall corresponds to the projection of the wall on to a vertical plane.
The height used for the calculation of the total area of the walls is measured from the finished floor of the storey to the finished floor of the storey above it.
However, a natural person wishing to have a building constructed for his exclusive use as a residence may require different specifications from those prescribed in this section for the building.
This section does not apply to dispensing booths governed by the Petroleum Products Regulation, to supervision booths or to tollbooths.
O.C. 89-83, s. 61; O.C. 1721-85, s. 9; O.C. 753-91, s. 532.