3.2.3.7. Construction of Exposing Building Face (1) Except as permitted by Articles 3.2.3.9. and 3.2.3.10., if a limiting distance shown in Table 3.2.3.1.A. or Table 3.2.3.1.C. for a Group A, B, C, D or Group F, Division 3 occupancy classification permits an exposing building face to have unprotected openings not more than 10% of the exposing building face, the exposing building face shall be (a) of noncombustible construction having a fire-resistance rating not less than 1 h, and (b) clad with noncombustible cladding. (2) Except as permitted by Sentence (9) and Articles 3.2.3.9. and 3.2.3.10., if a limiting distance shown in Table 3.2.3.1.A. or Table 3.2.3.1.C. for a Group A, B, C, D or Group F, Division 3 occupancy classification permits an exposing building face to have unprotected openings more than 10% but not more than 25% of the exposing building face, the exposing building face shall (a) have a fire-resistance rating not less than 1 h, and (b) be clad with noncombustible cladding. (3) Except as permitted by Articles 3.2.3.9. and 3.2.3.10., if a limiting distance shown in Table 3.2.3.1.A. or Table 3.2.3.1.C. for a Group A, B, C, D or Group F, Division 3 occupancy classification permits an exposing building face to have unprotected openings more than 25% but less than 100% of the exposing building face, the exposing building face shall have a fire-resistance rating not less than 45 min. (4) Except as permitted by Article 3.2.3.9., if a limiting distance shown in Table 3.2.3.1.B. or Table 3.2.3.1.D. for a Group E, or Group F, Division 1 or 2 occupancy classification permits an exposing building face to have unprotected openings not more than 10% of the exposing building face, the exposing building face shall be (a) of noncombustible construction having a fire-resistance rating not less than 2 h, and (b) clad with noncombustible cladding. (5) Except as permitted by Sentence (9) and Article 3.2.3.9., if a limiting distance shown in Table 3.2.3.1.B. or Table 3.2.3.1.D. for a Group E, or Group F, Division 1 or 2 occupancy classification permits an exposing building face to have unprotected openings more than 10% but not more than 25% of the exposing building face, the exposing building face shall (a) have a fire-resistance rating not less than 2 h, and (b) be clad with noncombustible cladding. (6) Except as permitted by Article 3.2.3.9., if a limiting distance shown in Table 3.2.3.1.B. or Table 3.2.3.1.D. for a Group E, or Group F, Division 1 or 2 occupancy classification permits an exposing building face to have unprotected openings more than 25% but less than 100% of the exposing building face, the exposing building face shall have a fire-resistance rating not less than 1 h. (7) Except as permitted by Sentence (9), in addition to the requirements of Sentences (2), (3), (5) and (6), foamed plastic insulation used in an exterior wall of a building more than 3 storeys in building height shall be protected on its exterior surface by (a) concrete or masonry not less than 25 mm thick, or (b) noncombustible material that complies with the criteria for testing and conditions of acceptance of Sentence (8) when tested in conformance with CAN/ULC-S101-M, “Standard Methods of Fire Endurance Tests of Building Construction and Materials”. (8) The criteria for testing and the conditions of acceptance for a wall assembly to satisfy the requirements of Clause (7)(b) are that (a) the fire exposed area of the wall assembly shall be not less than 9.3 m2 and have no dimension less than 2 750 mm, (b) the exposed surface will include typical vertical and horizontal joints, (c) the test shall be continued for not less than 15 min and the standard time/temperature curve of the referenced standard shall be followed, (d) the noncombustible protective material will remain in place and no through openings will develop that are visible when viewed normal to the face of the material, and (e) the noncombustible protective material will not disintegrate in a manner that would permit fire to propagate along the surface of the test assembly. (9) The requirements of Clauses (2) (b) and (5) (b) and Sentence (7) are waived for a wall assembly that complies with the requirements of Article 3.1.5.5.