Back9.4.2.2.(2)

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

Objective:

OS2.1

 

APPLICATION:

Minimum snow loads to be taken into consideration for light-frame constructions where wall, floor and roof planes are generally comprised of frames of small repetitive structural members, and where
  • roof and wall planes are clad, sheathed or braced on at least one side,
  • the small repetitive structural members are spaced not more than 600 mm o.c.,
  • the span of any structural member does not exceed 12.20 m,
  • the maximum deflection of the structural roof members conforms to Article 9.4.3.1.,
  • the maximum total roof area, notwithstanding any separation of adjoining buildings by firewalls, is 4 550 m2, and
  • for flat roofs, there are no significant obstructions on the roof, such as parapet walls, spaced closer than the distance calculated by: Do=10Ho-0.8 Ss/g where Do = minimum distance between obstructions, m, Ho = height of the obstruction above the roof, m, Ss = ground snow load, kPa, and γ = unit weight of snow, kN/m3.
This applies to 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 the design live load for the roof will be less than the anticipated load from maintenance workers and their equipment, which could lead to the collapse of the roof, which could lead to harm to persons.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

Objective:

OP2.1

 

APPLICATION:

Minimum snow loads to be taken into consideration for light-frame constructions where wall, floor and roof planes are generally comprised of frames of small repetitive structural members, and where
  • roof and wall planes are clad, sheathed or braced on at least one side,
  • the small repetitive structural members are spaced not more than 600 mm o.c.,
  • the span of any structural member does not exceed 12.20 m,
  • the maximum deflection of the structural roof members conforms to Article 9.4.3.1.,
  • the maximum total roof area, notwithstanding any separation of adjoining buildings by firewalls, is 4 550 m2, and
  • for flat roofs, there are no significant obstructions on the roof, such as parapet walls, spaced closer than the distance calculated by: Do=10Ho-0.8 Ss/g where Do = minimum distance between obstructions, m, Ho = height of the obstruction above the roof, m, Ss = ground snow load, kPa, and γ = unit weight of snow, kN/m3.
This applies to 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 the design live load for the roof will be less than the anticipated load from maintenance workers and their equipment, which could lead to the collapse of the roof, which could lead to damage to the building.