Every foundation wall, exterior wall, and exterior roof shall be substantially weathertight, watertight, and rodent proof; all exterior walls shall be made impervious to the adverse effects of weather by periodic application of paint or a similar protective coating and shall be kept in a sound condition an good repair. All foundation walls and exterior roofs shall be maintained in a safe manner, and capable of supporting the loads which normal use may cause to be placed thereon.
(1976 Code)