| 9.20.7. |
Chases and Recesses |
| 9.20.7.1. |
Maximum Dimensions
- Except as permitted in Sentence 9.20.7.2.(2) and Article 9.20.7.4., the depth of any chase or recess shall not exceed one third the thickness of the wall, and the width of the chase or recess shall not exceed 500 mm.
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| 9.20.7.2. |
Minimum Wall Thickness
- Except as permitted in Sentence (2) and Article 9.20.7.4., no chase or recess shall be constructed in any wall 190 mm or less in thickness.
- Recesses may be constructed in 190 mm walls provided they do not exceed 100 mm in depth, 750 mm in height and 500 mm in width.
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| 9.20.7.3. |
Separation of Chases or Recesses
- Chases and recesses shall be not less than
- 4 times the wall thickness apart, and
- 600 mm away from any pilaster, cross wall, buttress or other vertical element providing required lateral support for the wall.
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| 9.20.7.4. |
Non-Conforming Chases or Recesses
- Chases or recesses that do not conform to the limits specified in Articles 9.20.7.1. to 9.20.7.3. shall be considered as openings, and any masonry supported above such a chase or recess shall be supported by a lintel or arch as provided in Article 9.20.5.2.
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| 9.20.7.5. |
Chases or Recesses Cut into Walls
- Chases and recesses shall not be cut into walls made with hollow units after the masonry units are in place.
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