This chapter governs the design and construction of buildings for energy efficiency. The following amendments shall supersede the requirements of the 2012 International Energy Conservation Code.
Buildings shall be designed and constructed in accordance with the 2012 International Energy Conservation Code.
- Group R-2, R-3, and R-4 buildings that are three stories or less in height above grade plane shall comply with Chapter 4 of the 2009 International Energy Conservation Code.
Walls associated with basements and that make up the building's thermal envelope shall be insulated from the inside or outside of the basement wall from the top of the basement wall down below grade to the design frost depth in accordance with Table 1809.5.
Building entrances shall be protected with an enclosed vestibule, with all doors opening into and out of the vestibule equipped with self-closing devices. Vestibules shall be designed so that in passing through the vestibule it is not necessary for the interior and exterior doors to open at the same time. The installation of one or more revolving doors in the building entrance shall not eliminate the requirement that a vestibule be provided on any doors adjacent to revolving doors. This section replaces Section C402.4.7 of the International Energy Conservation Code.
Exceptions: Vestibules are not required for the following:
- Doors that have an air curtain with a velocity of not less than 6.56 feet per second (2 m/s) at the floor that have been tested in accordance with ANSI/AMCA 220 and installed in accordance with the manufacturer’s instructions. Manual or automatic controls shall be provided that will operate the air curtain with the opening and closing of the door. Air curtains and their controls shall comply with Section C408.2.3.
- Doors not intended to be used by the public, such as doors to mechanical or electrical equipment rooms, or intended solely for employee use.
- Doors opening directly from a sleeping unit or dwelling unit.
- Doors that open directly from a space less than 3,000 square feet (298 m2) in area.
- Revolving doors.
- Doors used primarily to facilitate vehicular movement or material handling and adjacent personnel doors.
The following low energy buildings, or portion thereof separated from the remainder of the building by building thermal envelope assemblies complying with this section, shall be exempt from the building thermal envelope provisions of Section C402. This section replaces Section C101.5.2 of the International Energy Conservation Code.
- Those with a peak design rate of energy usage less than 3.4 Btu/h • ft2 (10.7W/m2) or 1.0 watt per square foot (10.7 W/m2) of floor area for space conditioning purposes.
- Those that do not contain conditioned space.
- Production Greenhouses and Commercial Greenhouses.
- Factory/ or industrial buildings where ventilation is required for equipment cooling purposes only.