1. PURPOSE
The purpose of this code is to provide minimum requirements for the energy-efficient design of residential commercial and government buildings.
2. SCOPE
2.1 This code provides minimum energy-efficient requirements for the design and construction of (a) new buildings and their systems; (b) new portions of buildings and their systems, (c) new systems and equipment in existing buildings, and (d) major renovations. Major renovations are defined as projects where the estimated cost of construction is more than 50% of the appraised value of the structure.
3. ADMINISTRATION AND ENFORCEMENT
3.1.1 New Buildings. New buildings shall comply with either the provisions of § 4 through § 7 of this code or the energy cost budget method in Section 13 of ASHRAE/IESNA Standard 90.1-1989.
3.1.2 Additions to Existing Buildings. Additions shall comply with the provisions of § 4 through § 7 applicable to building envelope, heating, ventilating, air-conditioning, service water heating, power, lighting, and other systems and equipment. Compliance may be demonstrated in one of three ways:
a. The addition alone shall comply with the applicable requirements;
b. The addition, together with the entire existing building, shall comply with the requirements of this code that would apply to the entire building, as if it were a new building; or,
c. The addition, together with the existing building, shall use no more energy than the existing building together with an addition which complies with the literal requirements of the code.
Exception: When space conditioning or service water heating to an addition are provided by existing systems, the existing systems and equipment for such space conditioning and service water heating need not comply with this code. However, any new equipment installed must comply with specific requirements applicable to that equipment.
3.1.3 Alterations to Existing Buildings. Portions of a building and its systems that are being altered shall meet the provisions of § 4 through § 7. The specific requirements for alterations are described in the following subsections.
3.1.3.1 Envelope. Alterations to the building envelope shall comply with the requirements of § 4 for insulation, moisture control, air leakage, and glazing applicable to the portions of the buildings and its systems being altered.
Exceptions: The following alterations need not comply with these requirements provided such alterations do not increase the energy usage of the building:
a. replacement of glass in existing sash and frame, provided the area-weighted solar heat gain coefficient (SHGC) will be equal to or lower than before the glass replacement,
b. modifications to roof/ceiling, wall, or floor cavities, which are insulated to full depth with insulation having a minimum nominal value of R-3.0/in.,
c. modifications to walls and floors without framing cavities, and
d. replacement of a roof membrane where either the roof sheathing or roof insulation is not exposed or, if there is existing roof insulation, below the roof deck.
3.1.3.2 Ventilation and Air Conditioning. Alterations to building ventilating, and air-conditioning equipment or systems shall comply with the requirements of § 5 applicable to the portions of the building and its systems being altered. Any new equipment or control devices installed in conjunction with the alteration shall comply with the specific requirements applicable to that equipment or control device.
3.1.3.3 Service Water Heating. Alterations to building service water heating equipment or systems shall comply with the requirements of § 6 applicable to the portions of the building and its systems being altered. Any new equipment or control devices installed in conjunction with the alteration shall comply with the specific requirements applicable to that equipment or control device.
Exception to § 3.1.3.4: Alterations that replace less than 50% of the luminaires in a space need not comply with these requirements provided such alterations do not increase the connected lighting load.
3.2 Administrative Requirements
Administrative requirements relating to permit requirements, enforcement, interpretations, claims of exemption, approved calculation methods, and rights of appeal are specified by the building official.
3.3.1 General. Plans, specifications, engineering calculations, diagrams, reports, and other data shall constitute the compliance documents.
3.3.2 Construction Details. Compliance documents shall show all pertinent data and features of the building, equipment, and systems in sufficient detail to permit an evaluation by the building official relative to this code.
3.3.3 Supplemental Information. The building official may require supplemental information necessary to verify compliance with this code, such as calculations, worksheets, compliance forms, vendor literature, or other data.