Weather-tight Elements

(A) An exterior openable window shall be considered weathertight only when: (1) All panes of glass are in place, unbroken and properly sealed; (2) The window sash opens and closes fully without excessive effort; and (3) One of the following conditions is met: (a) The window sash is sufficiently well-fitted such that it minimizes the infiltration of air or moisture and the space between the window sash and the prime window frame is no larger than c inch at any point on the perimeter of the sash in the case of double hung windows and 1/16 inch in the case of casement windows; or (b) A storm window is affixed to the prime window frame in such a way as to minimize the infiltration of air or moisture. (B) A door leading from a residence or dwelling unit to the exterior shall be considered to be weathertight only if: (1) All panes of glass are in place, unbroken and properly sealed; (2) The door opens and closes fully without excessive effort; and (3) One of the following conditions is met: (a) The door is sufficiently well-fitted so that it minimizes the infiltration of air or moisture and the space between the door and the prime door frame is no larger than c inch at any point on the sides of the door; or (b) storm door is affixed to the prime door frame in such a way as to minimize the infiltration of air or moisture. (C) Building and structural elements shall be considered weather-tight when all cracks and spaces not part of heating, ventilating, or air conditioning systems are sealed to prevent infiltration of exterior air or moisture.