| 9.20.6. |
Thickness and Height |
| 9.20.6.1. |
Thickness of Exterior Walls
- Masonry exterior walls, other than cavity walls, in 1-storey buildings and the top storeys of 2- and 3-storey buildings shall be not less than 140 mm thick, provided the walls are not more than 2.8 m high at the eaves and 4.6 m high at the peaks of gable ends.
- The exterior walls of the bottom storeys of 2-storey buildings, and exterior walls of the bottom 2 storeys of 3-storey buildings shall be not less than 190 mm thick.
- In exterior walls composed of more than one wythe, each wythe shall be not less than 90 mm thick.
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| 9.20.6.2. |
Cavity Walls
- Cavity walls shall be made with not less than 90 mm wide units if the joints are raked and not less than 75 mm wide units if the joints are not raked.
- The width of a cavity in a cavity wall shall be not less than 50 mm and not greater than 150 mm.
- The minimum thickness of cavity walls above the supporting base shall be 230 mm for the top 7.6 m and 330 mm for the remaining portion, except that where 75 mm wide units are used, the wall height above the top of the foundation wall shall not exceed 6 m.
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| 9.20.6.3. |
Thickness of Interior Walls
- The thickness of loadbearing interior walls shall be determined on the basis of the maximum lateral support spacing as provided in Sentences 9.20.10.1.(2) and (3).
- The thickness of interior non-loadbearing walls shall be
- determined on the basis of the maximum lateral support spacing as provided in Sentences 9.20.10.1.(2) and (3), and
- in any case, not less than 65 mm.
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| 9.20.6.4. |
Masonry Veneer
- Except for masonry veneer where each masonry unit is supported individually by the structural backing, masonry veneer shall consist of solid masonry units not less than 75 mm thick.
- Veneer described in Sentence (1) over wood-frame walls shall have not less than a 25 mm air space behind the veneer.
- Masonry veneer less than 90 mm thick shall have unraked joints.
- Masonry veneer shall conform to Subsection 4.3.2., where the masonry units are required to be individually supported by the structural backing.
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| 9.20.6.5. |
Parapet Walls
- The height of parapet walls above the adjacent roof surface shall be not more than 3 times the parapet wall thickness.
- Parapet walls shall be solid masonry
- with the cells of hollow or semi-solid units filled with mortar, grout, or concrete, and
- that extends from the top of the parapet to not less than 300 mm below the adjacent roof level.
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| 9.20.6.6. |
Stone or Concrete Facings
- Slab and panel facings of precast concrete and natural or artificial stone shall conform to Subsection 4.3.2.
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