Intent 1:
To limit the probability of excessively long spans
of beams or joists, which could lead to beams being unable to resist
the additional weight of a concrete topping, which could lead to excessive
deflection or failure.
Where wood-frame construction
supports or is part of an environmental separator, this is to limit
the probability of the displacement or failure of required environmental
separation elements, which could lead to:
- condensation,
- precipitation ingress,
- excessive heat transfer,
- pollutant ingress, or
- compromised thermal performance of components intended
to resist 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 further compromised
integrity of environmental 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.