Loads and Procedures

(1)Above ground climatic loads shall be determined according to MMAH Supplementary Standard SB-1, "Climatic and Seismic Data."

(2)Except as provided in Sentence (3), below ground exterior environmental loads not described in MMAH Supplementary Standard SB-1, "Climatic and Seismic Data," shall be determined from existing geological and hydrological data or from site tests.

(3)Where local design and construction practice has shown soil temperature analysis to be unnecessary, soil temperatures need not be determined.

(1)Interior environmental loads shall be determined in accordance with good engineering practice as described in Sentence 6.2.1.1.(1) based on the intended use of the space.

(1)Calculations related to the transfer of heat, air and moisture and the transmission of sound shall conform to good engineering practice such as that described in the ASHRAE Handbooks.

(2)For the purposes of any analysis conducted to indicate conformance to the thermal resistance levels required in Article 5.3.1.2., soil temperatures shall be determined based on annual average soil temperature, seasonal amplitude of variation and attenuation of variation with depth.

(3)Wind load calculations shall conform to Subsection 4.1.7.

(1)Where materials, components or assemblies that separate dissimilar environments or are exposed to the exterior, or their connections, are required to be designed for structural loads, these loads shall be determined in accordance with Part 4.

(2)Except as provided in Article 4.1.8.18., the structural loads referred to in Sentence (1) and their related effects shall include,

• (a) dead loads transferred from structural elements,
• (b) wind, snow, rain, hydrostatic and earth pressures,
• (c) earthquake effects for post-disaster buildings, depending on their intended function,
• (d) live loads due to use and occupancy, and
• (e) loads due to thermal or moisture-related expansion and contraction, deflection, deformation, creep, shrinkage, settlement, and differential movement.

(3)Where materials, components or assemblies that separate dissimilar environments or are exposed to the exterior, or their connections, can be expected to be subject to loads or other effects not otherwise described in this Subsection or in Part 4, such loads or other effects shall be taken into account in the design based on the most current and applicable information available.

(1)This Article applies to the determination of wind load to be used in the design of materials, components and assemblies, including their connections, that separate dissimilar environments or are exposed to the exterior, where these are,

• (a) subject to wind load, and
• (b) required to be designed to resist wind load.

(2)Except as provided in Sentence (3), the wind load referred to in Sentence (1) shall be 100% of the specified wind load determined in accordance with Article 4.1.7.1.

(3)Where it can be shown by test or analysis that a material, component, assembly or connection referred to in Sentence (1) will be subject to less than 100% of the specified wind load, the wind load referred to in Sentence (1) shall be not less than the load determined by test or analysis.

(4)Except as provided in Sentence (5), the wind uplift resistance of membrane roofing assemblies shall be determined in accordance with the requirements of CAN/CSA A123.21, "Standard test method for the dynamic wind uplift resistance of membrane-roofing systems."

(5)Membrane roofing assemblies with proven past performance for the anticipated wind loads need not comply with Sentence (4).

(1)Structural design shall be carried out in accordance with Subsection 4.1.3. and other applicable requirements in Part 4.