9.20.9. Bonding and Tying

9.20.9. Bonding and Tying
9.20.9.1. Joints to be Offset or Reinforced
  1. Vertical joints in adjacent masonry courses shall be offset unless each wythe of masonry is reinforced with the equivalent of not less than 2 corrosion-resistant steel bars of 3.76 mm diam placed in the horizontal joints at vertical intervals not exceeding 460 mm.
  2. Where joints in the reinforcing referred to in Sentence (1) occur, the bars shall be lapped not less than 150 mm.
9.20.9.2. Bonding or Tying of Other than Masonry Veneer
  1. Except as provided in Article 9.20.9.5. regarding masonry veneer, masonry walls that consist of 2 or more wythes shall have the wythes bonded or tied together with masonry bonding units as described in Article 9.20.9.3. or with metal ties as described in Article 9.20.9.4.
9.20.9.3. Bonding
  1. Where wythes are bonded together with masonry units, the bonding units shall comprise not less than 4% of the wall surface area.
  2. Bonding units described in Sentence (1) shall be spaced not more than 600 mm vertically and horizontally in the case of brick masonry and 900 mm o.c. in the case of block or tile.
  3. Units described in Sentence (1) shall extend not less than 90 mm into adjacent wythes.
9.20.9.4. Tying
  1. Where 2 or more wythes are tied together with metal ties of the individual rod type, the ties shall conform to the requirements in Sentences (3) to (6).
  2. Other ties may be used where it can be shown that such ties provide walls that are at least as strong and as durable as those made with the individual rod type.
  3. Metal ties of the individual rod type shall
    1. be corrosion-resistant,
    2. have a minimum cross-sectional area of not less than 17.8 mm2, and
    3. have not less than a 50 mm portion bent at right angles at each end.
  4. Metal ties of the individual rod type shall
    1. extend from within 25 mm of the outer face of the wall to within 25 mm of the inner face of the wall,
    2. be completely embedded in mortar except for the portion exposed in cavity walls, and
    3. be staggered from course to course.
  5. Where 2 or more wythes in walls other than cavity walls and masonry veneer/masonry backing walls are tied together with metal ties of the individual rod type, the space between wythes shall be completely filled with mortar.
  6. Ties described in Sentence (5) shall be
    1. located within 300 mm of openings and spaced not more than 900 mm apart around openings, and
    2. spaced not more than 900 mm apart horizontally and 460 mm apart vertically at other locations.
  7. Except as required in Sentences (8) and (9), where the inner and outer wythes of cavity walls are tied with individual wire ties, the ties shall be spaced not more than 900 mm apart horizontally and 400 mm apart vertically.
  8. Within 100 mm of the bottom of each floor or roof assembly where the cavity extends below the assemblies, the ties described in Sentence (7) shall be spaced not more than 600 mm apart horizontally.
  9. Within 300 mm of any openings, the ties described in Sentence (7) shall be spaced not more than 900 mm apart.
9.20.9.5. Ties for Masonry Veneer
  1. Masonry veneer 75 mm or more in thickness and resting on a bearing support shall be tied to masonry backing or to wood framing members with straps that are
    1. corrosion-resistant,
    2. not less than 0.76 mm thick,
    3. not less than 22 mm wide,
    4. shaped to provide a key with the mortar, and
    5. spaced in accordance with Table 9.20.9.5.

      Table 9.20.9.5.
      Veneer Tie Spacing
      Forming Part of Sentence 9.20.9.5.(1)

      Table 9.20.9.5. Veneer Tie Spacing

  2. Straps described in Sentence (1) that are fastened to wood framing members shall be
    1. bent at a right angle within 6 mm from the fastener, and
    2. fastened with corrosion-resistant 3.18 mm diam screws or spiral nails having a wood penetration of not less than 63 mm.
  3. Masonry veneer individually supported by masonry or wood-frame backing shall be secured to the backing in conformance with Subsection 4.3.2.
9.20.9.6. Reinforcing for Glass Block
  1. Glass block shall have horizontal joint reinforcement of 2 corrosion-resistant bars of not less than 3.76 mm diam or expanded metal strips not less than 75 mm wide
    1. spaced at vertical intervals of not more than 600 mm for units 200 mm or less in height, and
    2. installed in every horizontal joint for units higher than 200 mm.
  2. Reinforcement required in Sentence (1) shall be lapped not less than 150 mm.

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