Intent 1:
To limit the probability of columns having inadequate
moisture protection, which could lead to the entry of moisture into
the end grain of wood columns, which could lead to rotting, which
could lead to structural failure of columns.
For
columns that support exterior walls or roofs, this is to limit the
probability of excessive deformation or deflection, or compromised
air barrier systems, which could lead to:
- condensation,
- precipitation ingress, 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 in interior spaces,
relative humidity, or water accumulation,
- the generation of pollutants from biological growth
or from materials that become unstable on wetting, or
- further compromised integrity of environmental separators,
which could lead to the deterioration of building elements.
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.