Notes to Table 3.2.3.1.C.:
3.2.3.7. Construction of Exposing Building Face (1) Except as provided by Sentences (3) to (5) and Articles 3.2.3.10. and 3.2.3.11, the fire-resistance rating, construction and cladding for exposing building faces of buildings or fire compartments
shall comply with Table 3.2.3.7. (2) Reserved (3) Except as provided by Sentences (4) and (5) and Articles 3.1.4.8. and 3.1.6.9., cladding for buildings or fire compartments where the maximum permitted area of unprotected openings is more than 10% of the exposing building face need not be noncombustible
where the wall assembly complies with the requirements of Sentence 3.1.5.5.(1) when tested in conformance with CAN/ULC-S134, “Fire Test of Exterior Wall Assemblies”. Note: On July 1, 2022, Sentence 3.2.3.7.(3) of Division B of the Regulation is amended by striking out “Except as provided by Sentences (4) to (6) and Articles 3.2.3.10. and 3.2.3.11.” at the beginning and substituting “Except as provided by Sentences (4) to (6) and Articles 3.1.6.9., 3.2.3.10. and 3.2.3.11.”. (See: O. Reg. 451/22, s. 17 (1)) (4) Except as provided by Articles 3.1.4.8. and 3.1.6.9., cladding for buildings
or fire compartments where the maximum permitted area of unprotected openings is more than 10% but not more than 25% of the exposing building face
need not be noncombustible where the wall assembly complies with Article 3.1.5.5. (5) Except as provided by Articles 3.1.4.8. and 3.1.6.9., cladding for buildings
or fire compartments where the maximum permitted area of unprotected openings is more than 25% but not more than 50% of the exposing building face need not be noncombustible where, (a) the limiting distance is greater than 5 m, (b) the building
or fire compartment and all combustible attic or roof spaces are sprinklered, (c) the cladding, (i) conforms to Subsection 9.27.6., 9.27.7., 9.27.8., 9.27.9. or 9.27.10., (ii) 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 (iii) after conditioning in conformance with ASTM D2898, “Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing”, has a flame-spread rating
not greater than 25 on the exterior face when tested in accordance with Sentence 3.1.12.1.(1), (d) the cladding, (i) conforms to Subsection 9.27.12., (ii) is installed with or without furring members over gypsum sheathing at least 12.7 mm thick or over masonry, (iii) has a flame-spread rating not greater than 25 when tested in accordance with Sentence 3.1.12.1.(2), and (iv) does not exceed 2 mm in thickness exclusive of fasteners, joints and local reinforcements, or (e) the wall assembly complies with Article 3.1.5.5. (6), (7) Revoked: O. Reg. 89/23, s. 9 (5). (8) The construction requirements for the exposing building face
that are listed in Table 3.2.3.7. shall be satisfied before the area of unprotected openings may be increased as permitted by Sentence 3.2.3.12.(1). Table 3.2.3.7.   Minimum Construction Requirements for Exposing Building Faces Forming Part of Sentences 3.1.6.9.(5) and 3.2.3.7.(1) and (8)  Column 1   Item   Column 2  Occupancy Classification of Building or Fire Compartment   Column 3   Maximum Area of Unprotected Openings Permitted, % of Exposing Building Face Area   Column 4   Minimum Required Fire-Resistance Rating   Column 5   Type of Construction Required   Column 6   Type of Cladding Required 

  1.   Group A, B, C, D, or Group F, Division 3   0 to 10   1h   Noncombustible   Noncombustible 

  2.   Group A, B, C, D, or Group F, Division 3   > 10 to 25   1h   Combustible, Encapsulated Mass Timber Construction, or Noncombustible    Noncombustible 

  3.   Group A, B, C, D, or Group F, Division 3   > 25 to 50   45 min   Combustible, Encapsulated Mass Timber Construction, or Noncombustible   Noncombustible 

  4.   Group A, B, C, D, or Group F, Division 3   > 50 to < 100   45 min   Combustible, Encapsulated Mass Timber Construction, or Noncombustible   Combustible or Noncombustible(1)(2) 

  5.   Group E, or Group F, Division 1 or 2   0 to 10   2 h   Noncombustible   Noncombustible 

  6.   Group E, or Group F, Division 1 or 2   > 10 to 25   2 h   Combustible, Encapsulated Mass Timber Construction, or Noncombustible   Noncombustible 

  7.   Group E, or Group F, Division 1 or 2   > 25 to 50   1 h   Combustible, Encapsulated Mass Timber Construction, or Noncombustible   Noncombustible 

  8.   Group E, or Group F, Division 1 or 2   > 50 to < 100   1 h   Combustible, Encapsulated Mass Timber Construction, or Noncombustible   Combustible or Noncombustible(1)(2)