Intent 1:
To limit the probability that inappropriate grades
of visually graded lumber will be used, which could lead to compromised
structural integrity of the visually graded lumber or of elements
supported by the visually graded lumber, which could lead to excessive
movement, deformation or failure under expected lateral, gravity or
wind uplift loads.
This is to limit the probability
of:
- compromised structural integrity, or
- where lumber supports or is used in an environmental
separator, the displacement or failure of required environmental separation
elements, which could lead to the deterioration of building elements,
which could lead to compromised structural integrity, or
- an inability to resist expected loads, which could lead
to
- the excessive deformation or deflection of walls, or
- the excessive deflection or vibration of floors.
This is to limit the probability of:
- a loss of balance, tripping or falling,
- the compromised operation of doors or windows required
for egress in an emergency.
This is to limit the probability of harm to persons.