Unusually Tight Construction

is construction where:

(1) Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one (1) perm or less with any openings gasketed or sealed;
(2) Weatherstripping is on openable windows and doors; and
(3) Caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, and at penetrations for plumbing, electrical, and gas lines and at other openings.