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9.20.17.6.(1)
OS2OP2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Anchorage of top plates supporting roof framing supported on the top of flat insulating concrete form walls not in contact with the ground, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the floor-to-floor height is not greater than 3 m,
  • the buildings are not more than 2 storeys in building height and they contain only a single dwelling unit, and
  • the buildings are erected in locations where the seismic spectral response acceleration, Sa(0.2), is not greater than 0.4.
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to insulating concrete form walls other than those described above, or where the walls are designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability that anchor bolts of insufficient size will be used and spaced too far apart, which could lead to the roof framing becoming detached from the insulating concrete form walls, which could lead to an inability to resist expected gravity and lateral loads.
This is to limit the probability of compromised structural integrity, which could lead to:
  • elements falling from the building,
  • structural failure, or
  • where elements support or are part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.
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