1. by one of the interior finishes described in Subsections 9.29.4. to 9.29.9.,
2. provided the building does not contain a Group A, Group B or Group C major occupancy, by sheet metal
   1. mechanically fastened to the supporting assembly independent of the insulation,
   2. not less than 0.38 mm thick, and
   3. with a melting point not below 650°C, or
3. by any thermal barrier that meets the requirements of Sentence 3.1.5.15.(2) (see Note A-3.1.4.2.(1)(c)).
   (See Note A-3.1.4.2.(1).)

1. are protected on both sides by sheet metal not less than 0.38 mm thick having a melting point not less than 650°C,
2. do not contain an air space, and
3. when a sample panel with an assembled joint typical of field installation is subjected to the applicable test described in Subsection 3.1.12., have a flame-spread rating not more than that permitted for the space in which they are located or the space that they bound, as applicable. (See Note A-3.1.4.2.(2) and 3.1.5.7.(3).)

1. not convey flame or continue to burn for more than 1 min when tested in conformance with the Vertical Flame Test (FT1 rating) in CSA C22.2 No. 0.3, "Test Methods for Electrical Wires and Cables," or
2. be located in
   1. totally enclosed noncombustible raceways (see Note A-3.1.4.3.(1)(b)(i)),
   2. masonry walls,
   3. concrete slabs, or
   4. totally enclosed non-metallic raceways conforming to Clause 3.1.5.23.(1)(b).
      (See Note A-3.1.4.3.(1).)
      (See also Sentence 3.6.4.3.(1).)

1. a horizontal flame distance of not more than 1.5 m,
2. an average optical smoke density of not more than 0.15, and
3. a peak optical smoke density of not more than 0.5.

1. be pressure impregnated with fire-retardant chemicals in conformance with CAN/CSA-O80 Series, "Wood Preservation," and
2. have a flame-spread rating not more than 25.

Table 3.1.4.7.
Heavy Timber Dimensions
Forming Part of Sentence 3.1.4.7.(2)

1. 64 mm thick, splined or tongued and grooved, or
2. 38 mm wide and 89 mm deep set on edge and well spiked together.

1. so that no continuous line of end joints will occur except at points of support, and covered with
   1. tongued and grooved flooring not less than 19 mm thick laid crosswise or diagonally, or
   2. tongued and grooved phenolic-bonded plywood, strandboard or waferboard not less than 12.5 mm thick, and
2. not closer than 15 mm to the walls to provide for expansion, with the gap covered at the top or bottom.

1. not less than 38 mm thick, splined or tongued and grooved, or
2. not less than 38 mm wide and 64 mm deep set on edge and laid so that no continuous line of end joints will occur except at the points of support.

1. reinforced concrete or metal caps with brackets,
2. steel or iron capswith pintles and base plates, or
3. timber splice plates fastened to the columns by metal connectors housed within the contact faces.

1. where two or more spaced members are used, the intervening spaces are
   1. blocked solidly throughout, or
   2. tightly closed by a continuous wood cover plate not less than 38 mm thick secured to the underside of the members,
      or
2. the underneath of the roof deck or sheathing is sprinklered.

1. noncombustible cladding, or
2. a wall assembly that satisfies the criteria of Clause 3.1.5.5.(1)(b).
   (See Note A-3.1.4.8.(1).) (See also Notes A-3.1.5.5.(1)(b)(i) and A-3.1.5.5.(1)(b)(ii).)