3.2.3.7.Construction of Exposing Building Face

(1) Except as provided by Sentences (3) and (4) 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 of Group A, B, C, D or Group F, Division 3 occupancy classification shall comply with Table 3.2.3.7. 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) to (4) Occupancy Classification Maximum Area of Unprotected Minimum Required of Building or Fire Openings Permitted, % of Fire-Resistance Type of Construction Required Type of Cladding Required Compartment Exposing Building Face Area Rating 0 to 10 1h Noncombustible Noncombustible Combustible, Encapsulated Mass Timber > 10 to 25 1h Noncombustible Group A, B, C, D, or Construction, or Noncombustible Group F, Division 3 Combustible, Encapsulated Mass Timber > 25 to 50 45 min Noncombustible Construction, or Noncombustible Combustible, Encapsulated Mass Timber Combustible or > 50 to < 100 45 min Construction, or Noncombustible Noncombustible(1)(2) 0 to 10 2h Noncombustible Noncombustible Combustible, Encapsulated Mass Timber > 10 to 25 2h Noncombustible Group E, or Construction, or Noncombustible Group F, Division 1 or 2 Combustible, Encapsulated Mass Timber > 25 to 50 1h Noncombustible Construction, or Noncombustible Combustible, Encapsulated Mass Timber Combustible or > 50 to < 100 1h Construction, or Noncombustible Noncombustible Notes to Table 3.2.3.7.: (1) The cladding on Group C buildings within the scope of Article 3.2.2.51. and on Group D buildings within the scope of Article 3.2.2.60. shall be noncombustible or consist of a wall that satisfies the requirements of Article 3.1.4.8. r1 (2) The cladding on buildings or parts thereof conforming to Article 3.2.2.48., 3.2.2.57. or 3.2.2.93. shall conform to Article 3.1.6.9. or be noncombustible. (2) Except as provided in Sentences (3) and (4) and Article 3.2.3.10., the fire-resistance rating, construction and cladding for exposing building faces of buildings or fire compartments of Group E or Group F, Division 1 or 2 occupancy classification shall comply with Table 3.2.3.7. (3) Except as provided in Articles 3.1.4.8. and 3.1.6.9., the requirement in Table 3.2.3.7. for noncombustible cladding for buildings or fire compartments where the maximum permitted area of unprotected openings is more than 10% of the exposing building face is permitted to be waived for exterior wall assemblies that comply with Article 3.1.5.5. or 3.1.5.6. (4) Except as provided by Articles 3.1.4.8. and 3.1.6.9., the requirement in Table 3.2.3.7. for noncombustible 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 is permitted to be waived 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 throughout, (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, “Standard Practice for 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 (See Note A- 3.2.3.7.(4)(d)(iv)) (e) the exterior wall assembly complies with Article 3.1.5.5. or 3.1.5.6. (5) The construction requirements for the exposing building face stated in Sentences (1) and (2) shall be satisfied before increasing the unprotected opening area as permitted by Sentence 3.2.3.12.(1).