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BCC Ruling No. 93-21-377

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IN THE MATTER OF BUT NOT LIMITED TO: Ontario Building Code, O/Reg. 413/90, as amended



Requirements for fire stopping in wall assemblies.


In favour of the Applicant.

Regarding the fire stopping in wall assemblies where the insulation within the wall space has a flame-spread rating greater than 25 at Providence Tower, 7900 McLaughlin Road South, Part of East Half of Lot 15, Concession 2, West of Hurontario Street, Brampton, Ontario.

It is the decision of the Building Code Commission that insulation in excess of a 25 flame spread rating within the wall space of a non-combustible building with no fire stopping, provided that there is only one concealed air space that is no more than 25 mm thick, shows sufficiency of compliance with the Ontario Building Code.


  1. Test data indicates that the thickness of the air space in the wall cavity is the critical factor to predicting the spread of fire vertically.

  1. The foam plastic insulation will be sandwiched between 2 layers of masonry.

  1. The National Building Code have permitted this proposal in an interim Code change.

Dated at Toronto this 20 day in the month of December in the year 1993 for application number A93-23-379.