Addition
Extension of or increase in conditioned floor area
and volume of a building, which can be new construction or adding
space conditioning to an existing space
Alteration
Any change to a building's water-heating system, space-conditioning system, lighting system, or
envelope that is not an addition
ASHRAE
American Society of Heating, Refrigerating, and Air-conditioning Engineers
Conditioned Floor Area (CFA)
Floor area (in square feet) of enclosed conditioned space on all floors of a
building, as measured at the floor level of the exterior surfaces of exterior walls enclosing the conditioned space
Conditioned Space
Space in a building that is either directly conditioned or indirectly conditioned
Conditioned Space, Directly
An enclosed space that is provided with wood heating, is provided with
mechanical heating that has a capacity exceeding 10 Btu/hr-ft²), or is provided with mechanical cooling that has a capacity
exceeding 5 Btu/hr-ft², unless the space-conditioning system is designed for a process space
Conditioned Space, Indirectly
An enclosed space, including, but not limited to, unconditioned volume in
atria, that (1) is not directly conditioned space; and (2) either (a) has a thermal transmittance area product (UA) to directly
conditioned space exceeding that to the outdoors or to unconditioned space and does not have fixed vents or openings to
the outdoors or to unconditioned space, or (b) is a space through which air from directly conditioned spaces is transferred
at a rate exceeding three air changes per hour
Daylight Area
Floor area under skylights or next to windows. The daylight area includes Primary Side-lit
Daylight Area, Secondary Side-lit Daylight Area, and Sky-lit Daylight Area
Fenestration
In simplest terms, windows or glass doors. Technically fenestration is described as any transparent or translucent material plus any sash, frame, mullion or divider. This includes windows, sliding glass doors, French doors, skylights, curtain walls and garden windows
Glazing
A covering of transparent or translucent material (typically glass or plastic) used for admitting light
Heating, Ventilating and Air Conditioning (HVAC)
A system that provides heating, ventilation and/or cooling within or associated with a building
Low-Rise Residential Building
All low-rise residential occupancies including
single family homes, duplexes, garden
apartments and other housing types with
three or fewer habitable stories:
• All single family dwellings of any number of stories (Group R-3)
• All duplex (two-dwelling) buildings of any number of stories (Group R-3)
• All multifamily buildings with three or fewer habitable stories (Groups R-1 and R-2)
• Additions and alterations to all of the above buildings
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