9.23.3. Fasteners

9.23.3. Fasteners
9.23.3.1. Standards for Nails and Screws
  1. Except as provided in Sentence (2) and unless otherwise indicated, nails specified in this Section shall be common steel wire nails or common spiral nails conforming to
    1. ASTM F 1667, "Driven Fasteners: Nails, Spikes, and Staples," or
    2. CSA B111, "Wire Nails, Spikes and Staples."
  2. Nails used to comply with Table 9.23.3.4. shall have a diameter not less than that stated in Table 9.23.3.1. (See Note A-9.23.3.1.(2).)

    Table 9.23.3.1.
    Diameter of Nails
    Forming Part of Sentence 9.23.3.1.(2)

    Table 9.23.3.1. Diameter of Nails

  3. Wood screws specified in this Section shall conform to ASME B18.6.1, "Wood Screws (Inch Series)." (See Note A-9.23.3.1.(3).)
9.23.3.2. Length of Nails
  1. All nails shall be long enough so that not less than half their required length penetrates into the second member.
9.23.3.3. Prevention of Splitting
  1. Splitting of wood members shall be minimized by staggering the nails in the direction of the grain and by keeping nails well in from the edges. (See Note A-9.23.3.3.(1).)
9.23.3.4. Nailing of Framing
  1. Except as provided in Sentence (2), nailing of framing shall conform to Table 9.23.3.4.
  2. Where the bottom wall plate or sole plate of an exterior wall is not nailed to floor joists, rim joists or blocking in conformance with Table 9.23.3.4., the exterior wall is permitted to be fastened to the floor framing by
    1. having plywood, OSB or waferboard sheathing extend down over floor framing and fastened to the floor framing by nails or staples conforming to Article 9.23.3.5., or
    2. tying the wall framing to the floor framing by galvanized-metal strips
      1. 50 mm wide,
      2. not less than 0.41 mm thick,
      3. spaced not more than 1.2 m apart, and
      4. fastened at each end with at least two 63 mm nails.

        Table 9.23.3.4.
        Nailing for Framing
        Forming Part of Sentence 9.23.3.4.(1)

        Table 9.23.3.4. Nailing for Framing

        Notes to Table 9.23.3.4.:
        (1) See Article 9.23.11.4. for requirements on the nailing of top plates in braced wall bands.
        (2) See Sentence 9.23.3.4.(2).
        (3) See Sentence 9.23.3.4.(3).

  3. Where the 1-in-50 hourly wind pressure is equal to or greater than 0.8 kPa, roof rafters, joists or trusses shall be tied to the wall framing with connectors that will resist a factored uplift load of 3 kN.
  4. 4) Galvanized-steel straps are deemed to comply with Sentence (3), provided they are
    1. 50 mm wide,
    2. not less than 0.91 mm thick, and
    3. fastened at each end with at least four 63 mm nails.
9.23.3.5. Fasteners for Sheathing or Subflooring
  1. Except as provided in Sentences (2) to (4), fastening of sheathing and subflooring shall conform to Table 9.23.3.5.-A.

    Table 9.23.3.5.-A
    Fasteners for Subflooring and for Sheathing where the 1-in-50 HWP < 0.8 kPa and Sa(0.2) ≤ 0.70
    Forming Part of Sentence 9.23.3.5.(1)

    Table 9.23.3.5.-A Fasteners for Subflooring and for Sheathing where the 1-in-50 HWP < 0.8 kPa and Sa(0.2) ≤ 0.70

  2. Fastening of roof sheathing and sheathing in required braced wall panels shall conform to Table 9.23.3.5.-B, where
    1. the 1-in-50 hourly wind pressure (HWP) is equal to or greater than 0.8 kPa and less than 1.2 kPa and the seismic spectral response acceleration, Sa(0.2), is not more than 0.90, or
    2. the seismic spectral response acceleration, Sa(0.2), is greater than 0.70 and not more than 0.90.

      Table 9.23.3.5.-B
      Fasteners for Sheathing where 0.8 kPa ≤ 1-in-50 HWP < 1.2 kPa and Sa(0.2) ≤ 0.90 or where 0.70 < Sa(0.2) ≤ 0.90
      Forming Part of Sentence 9.23.3.5.(2)

      Table 9.23.3.5.-B Fasteners for Sheathing where 0.8 kPa ≤ 1-in-50 HWP < 1.2 kPa and Sa(0.2) ≤ 0.90 or where 0.70 < Sa(0.2) ≤ 0.90


      Notes to Table 9.23.3.5.-B:
      (1) See Note A-Table 9.23.3.5.-B.

  3. Fastening of roof sheathing and sheathing in required braced wall panels shall conform to Table 9.23.3.5.-C, where
    1. the 1-in-50 hourly wind pressure (HWP) is equal to or greater than 0.8 kPa and less than 1.2 kPa and the spectral response acceleration, Sa(0.2), is not more than 1.8, or
    2. the seismic spectral response acceleration, Sa(0.2), is greater than 0.90 and not more than 1.8.

      Table 9.23.3.5.-C
      Fasteners for Sheathing where 0.8 kPa ≤ 1-in-50 HWP < 1.2 kPa and Sa(0.2) ≤ 1.8 or where 0.90 < Sa(0.2) ≤ 1.8
      Forming Part of Sentence 9.23.3.5.(3)

      Table 9.23.3.5.-C Fasteners for Sheathing where 0.8 kPa ≤ 1-in-50 HWP < 1.2 kPa and Sa(0.2) ≤ 1.8 or where 0.90 < Sa(0.2) ≤ 1.8


      Notes to Table 9.23.3.5.-C:
      (1) See Note A-Table 9.23.3.5.-B.

  4. 4) Fastening of sheathing shall conform to Part 4,
    1. where the 1-in-50 hourly wind pressure is equal to or greater than 1.2 kPa, or
    2. for required braced wall panels, where the seismic spectral response acceleration, Sa(0.2), is greater than 1.8.
  5. Staples shall not be less than 1.6 mm in diameter or thickness, with not less than a 9.5 mm crown driven with the crown parallel to framing.
  6. Roofing nails for the attachment of fibreboard or gypsum sheathing shall not be less than 3.2 mm in diameter with a minimum head diameter of 11.1 mm.
  7. Flooring screws shall not be less than 3.2 mm in diameter.
  8. The edges of sheathing in a braced wall panel shall be supported and fastened to wood blocking where
    1. the seismic spectral response acceleration, Sa(0.2), is greater than 1.2, or
    2. the braced wall panel supports more than a roof of lightweight construction.

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