Leakage, drafts and infestation. All exterior walls, roofs, windows,
window frames, doors, door frames, skylights, foundations and other
parts of the structure shall be maintained as to keep water from entering
the structure, to prevent excessive drafts or heat loss during cold
or inclement weather and to provide a barrier against infestation.
Damaged or badly worn material shall be repaired or replaced, and
places showing signs of rot, leakage, deterioration or corrosion shall
be treated or restored to prevent weathering or seepage.