1. taken as the exterior wall area facing in one direction on any side of a building, and
2. calculated as
   1. the total area measured from the finished ground level to the uppermost ceiling, or
   2. the area for each fire compartment, where a building is divided into fire compartments by fire separations with fire-resistance ratings not less than 45 min.

1. the location of the exposing building face shall be taken as a vertical plane located so that no portion of the actual exposing building face is between the vertical plane and the line to which the limiting distance is measured, and
2. the value for the maximum area of unprotected openings (see second column of Table 9.10.14.5.-A) shall be determined using the limiting distance measured from the location described in Clause (a). (See Note A-3.2.3.1.(4).)

1. the time from receipt of notification of a fire by the fire department until the first fire department vehicle arrives at the building exceeds 10 min in 10% or more of all calls to the building, and
2. any storey in the building is not sprinklered. (See Notes A-3.2.3. and A-3.2.3.1.(8).)

1. conform to Table 9.10.14.4.-A,
2. conform to Subsection 3.2.3., or
3. where the limiting distance is not less than 1.2 m, be equal to or less than
   1. the limiting distance squared, for residential occupancies, business and personal services occupancies and low-hazard industrial occupancies, and
   2. half the limiting distance squared, for mercantile occupancies and medium-hazard industrial occupancies.
      

      Table 9.10.14.4.-A
      Maximum Aggregate Area of Unprotected Openings in Exterior Walls⁽¹⁾
      Forming Part of Sentence 9.10.14.4.(1)

      

      
      Notes to Table 9.10.14.4.-A:
      (1) See also Sentences (6) and (7) to calculate the maximum permitted area of unprotected openings in sprinklered buildings or where wired glass or glass blocks are used.

1. the area stated in Table 9.10.14.4.-B, or
2. where the limiting distance is equal to or greater than 1.2 m, the area calculated by

   where
   Area = area of the unprotected opening, and
   LD = limiting distance.
   

   Table 9.10.14.4.-B
   Maximum Concentrated Area of Unprotected Openings
   Forming Part of Sentence 9.10.14.4.(3)
   

   

1. 2 m horizontally of another unprotected opening that is on the same exposing building face and serves the single room or space, or
2. 2 m vertically of another unprotected opening that serves the single room or space, or another room or space on the same storey.

1. two or more adjacent spaces having a full-height separating wall extending less than 1.5 m from the interior face of the exterior wall, or
2. two or more stacked spaces that are on the same storey.

1. wired glass in steel frames, as described in Article 9.10.13.5., or
2. glass blocks, as described in Article 9.10.13.7.

1. all storeys are constructed as open-air storeys, and
2. the storage garage has a limiting distance of not less than 3 m.

1. the detached garage or accessory building serves only one dwelling unit,
2. the detached garage or accessory building is located on the same property as that dwelling unit, and
3. the dwelling unit served by the detached garage or accessory building is the only major occupancy on the property.

Table 9.10.14.5.-A
Minimum Construction Requirements for Exposing Building Faces
Forming Part of Sentence 9.10.14.5.(1)

1. the limiting distance is greater than 5.0 m,
2. the limiting distance is greater than 2.5 m where the area and width-to-height ratio of the exposing building face conform to Table 9.10.14.5.-B,
3. the building or fire compartment is sprinklered,
4. the cladding
   1. conforms to Subsections 9.27.6., 9.27.7., 9.27.8. or 9.27.9.,
   2. is installed without furring members, or on furring not more than 25 mm thick, over gypsum sheathing at least 12.7 mm thick or over masonry, and
   3. after conditioning in conformance with ASTM D 2898, "Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing," has a flame-spread rating not greater than 25 when tested in accordance with Sentence 3.1.12.1.(2), or
5. the cladding
   1. conforms to Subsection 9.27.12.,
   2. is installed with or without furring members over a gypsum sheathing at least 12.7 mm thick or over masonry,
   3. has a flame-spread rating not greater than 25 when tested in accordance with Sentence 3.1.12.1.(2), and
   4. does not exceed 2 mm in thickness exclusive of fasteners, joints and local reinforcements.
      

      Table 9.10.14.5.-B
      Maximum Allowable Area and Ratio of Width to Height of Exposing Building Face
      Forming Part of Sentence 9.10.14.5.(3)

      

1. need not conform to the minimum required fire-resistance rating stated in Table 9.10.14.5.-A, where the limiting distance is 0.6 m or more,
2. shall have a fire-resistance rating of not less than 45 min, where the limiting distance is less than 0.6 m, and
3. need not conform to the type of cladding required by Table 9.10.14.5.-A, regardless of the limiting distance.

1. the detached garage or accessory building serves only one dwelling unit,
2. the detached garage or accessory building is located on the same property as that dwelling unit, and
3. the dwelling unit served by the detached garage or accessory building is the only major occupancy on the property.

1. 1.2 m of a property line or the centre line of a public way, or
2. 2.4 m of a combustible projection on another building on the same property.

1. buildings containing 1 or 2 dwelling units only, and
2. detached garages or accessory buildings, where
   1. the detached garage or accessory building serves only one dwelling unit,
   2. the detached garage or accessory building is located on the same property as that dwelling unit, and
   3. the dwelling unit served by the detached garage or accessory building is the only major occupancy on the property. (See Note A-9.10.14.5.(7).)

1. the construction of the face and sides of the projection shall comply with the corresponding requirements for exposing building faces for limiting distances less than 1.2 m as stated in Sentence (2) or (3), and
2. where the underside of the projection is more than 0.6 m above finished ground level, it shall be protected by
   1. not less than 0.38 mm thick noncombustible material,
   2. unvented aluminum conforming to CAN/CGSB-93.2-M, "Prefinished Aluminum Siding, Soffits, and Fascia, for Residential Use,"
   3. not less than 12.7 mm thick gypsum soffit board or gypsum ceiling board installed according to CSA A82.31-M, "Gypsum Board Application,"
   4. not less than 11 mm thick plywood,
   5. not less than 12.5 mm thick OSB or waferboard, or
   6. not less than 11 mm thick lumber. (See Note A-9.10.14.5.(8).)

1. have no openings, and
2. be protected by
   1. not less than 0.38 mm thick sheet steel,
   2. unvented aluminum conforming to CAN/CGSB-93.2-M, "Prefinished Aluminum Siding, Soffits, and Fascia, for Residential Use,"
   3. not less than 12.7 mm thick gypsum soffit board or gypsum ceiling board installed according to CSA A82.31-M, "Gypsum Board Application,"
   4. not less than 11 mm thick plywood,
   5. not less than 12.5 mm thick OSB or waferboard, or
   6. not less than 11 mm thick lumber. (See Note A-3.2.3.6.(2).)

1. is 1 storey in building height,
2. is of noncombustible construction,
3. is classified as a low-hazard industrial occupancy and used only for low fire load occupancies, such as power-generating plants or plants for the manufacture or storage of noncombustible materials, and
4. has a limiting distance of 3 m or more.