Back9.4.3.1.(1)

ATTRIBUTION:

Functional Statement:

F22

To limit movement under expected loads and forces.

Objective:

OS2.3

 

APPLICATION:

Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of the excessive deflection of structural members.
This is to limit the probability of:
  • for roof framing, rainwater ingress, and
  • for roof framing, ceiling joists or floor framing supporting air barrier materials, vapour barriers or insulation, the displacement or failure of these elements, which could lead to condensation.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of roofs, walls or floors, or of elements supported or protected by roofs, walls and floors, which could lead to structural failure, which could lead to harm to persons.

ATTRIBUTION:

Functional Statement:

F22

To limit movement under expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OP2.1, OP2.4, OP2.3

 

APPLICATION:

Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of the excessive deflection of structural members.
This is to limit the probability of:
  • compromised integrity of non-structural and structural components of the building, including ceiling membranes,
  • for roof framing, rainwater ingress into or through assemblies, which could lead to deterioration, which could lead to compromised structural integrity of roofs or of building elements protected by roofs,
  • for roof framing, ceiling joists or floor framing supporting air barrier materials, vapour barriers or insulation, condensation on interior surfaces or within assemblies or condensation of moisture from interior spaces, which could lead to deterioration, which could lead to compromised structural integrity of the roof, ceiling or floor or assemblies supported or protected by these assemblies, and
  • excessive springiness or deflection of floor and roof systems,
This is to limit the probability of:
  • the space being unsuitable for its intended use, or
  • damage to the building.

ATTRIBUTION:

Functional Statement:

F22

To limit movement under expected loads and forces.

Objective:

OH4

 

APPLICATION:

Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability that floor and roof systems will be excessively springy, or will become noticeably deformed, which could lead to negative effects on the psychological well-being of persons.

ATTRIBUTION:

Functional Statement:

F22

To limit movement under expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OS3.1, OS3.7

 

APPLICATION:

Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of excessive deflection of structural members.
This is to limit the probability of:
  • the excessive deflection or vibration of directly or indirectly supported floors, which could lead to persons losing their balance, tripping or falling; and
  • the excessive movement or deformation of directly or indirectly supported walls with windows or doors, which could lead to compromised operation of doors or windows required for egress in an emergency.
This is to limit the probability of harm to persons.

ATTRIBUTION:

Functional Statement:

F22

To limit movement under expected loads and forces.

Objective:

OH1.1, OH1.2, OH1.3

 

APPLICATION:

Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of the excessive deflection of structural members.
Where framing supports or is part of an environmental separator, this is to limit the probability of the excessive deflection, deformation, displacement or failure of required environmental separation elements, which could lead to:
  • precipitation ingress,
  • air leakage, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures of interior spaces, drafts, relative humidity, or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of environmental separators or of elements protected by such separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.