Non-Conforming Chases or Recesses

(1)  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.

Article 9.20.7.4 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.