1314.1 Building Envelope: The requirements of this section
shall apply to building elements separating conditioned from
unconditioned spaces. Exterior joints around windows and door
frames, openings between walls and foundation, between walls
and roof and wall panels; openings at penetrations of
utility services through walls, floors, and roofs; and all
other openings in the building envelope shall be sealed,
caulked, gasketed, or weatherstripped to limit air leakage.
1314.2 Glazing and Doors: Doors and operable glazing
separating conditioned from unconditioned space shall be
weatherstripped. Fixed windows shall be tight fitting with
glass retained by stops with sealant or caulking all around.
EXCEPTION:
Openings that are required to be fire resistant.
1314.3 Building Assemblies Used as Ducts or Plenums: Building
assemblies used as ducts or plenums shall be sealed, caulked,
and gasketed to limit air leakage.
1314.4 Recessed Lighting Fixtures: When installed in the
building envelope, recessed lighting fixtures shall be Type IC
rated, and certified under ASTM E283 to have no more than 2.0
cfm air movement from the conditioned space to the ceiling
cavity. The lighting fixture shall be tested at 75 Pascals or
1.57 lbs/ft2 pressure difference and have a label attached,
showing compliance with this test method. Recessed lighting
fixtures shall be installed with a gasket or caulk between the
fixture and ceiling to prevent air leakage.