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The provisions of Chapter 5 [CE] of the International Energy Conservation Code are hereby adopted by reference and shall apply with the following modifications:
1. C501.4 Compliance. Delete existing text. Revise to read:
C501.4 [Reserved].
2. [Reserved].
3. C502.1 General. Revise to read:
C502.1 General. Additions to an existing building, building system or portion thereof shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this code. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code if the addition alone complies or if the existing building and addition comply with this code as a single building, or if the building with the addition uses no more energy than the existing building. Additions shall comply with C502.2 and C402.3.
Additions complying with ANSI/ASHRAE/IESNA 90.1 need not comply with C402, C403, C404, and C405, but shall comply with C402.3.
4. C503 Alterations. Revise to read:
C503.1 General.Alterations to any building or structure shall comply with the requirements of the code for new construction. Alterations shall be such that the existing building or structure is no less conforming to the provisions of this code than the existing building or structure was prior to the alteration. Alterations to an existing building, building system or portion thereof shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this code. Alterations shall not create an unsafe or hazardous condition or overload existing building systems.
Alterations complying with ANSI/ASHRAE/IESNA 90.1 need not comply with Sections C402, C403, C404 and C405, but shall comply with C402.3.
Exception: The following alterations need not comply with the requirements for new construction, provided the energy use of the building is not increased:
1. Storm windows installed over existing fenestration.
2. Surface-applied window film installed on existing single-pane fenestration assemblies reducing solar heat gain provided the code does not require the glazing or fenestration to be replaced.
3. Existing ceiling, wall or floor cavities exposed during construction, provided that these cavities are filled with insulation.
4. Construction where the existing roof, wall or floor cavity is not exposed.
5. Roof recover, except for the urban heat island provisions in C503.3.1.
6. Air barriers shall not be required for roof recover and roof replacement where the alterations or renovations to the building do not include alterations, renovations or repairs to the remainder of the building envelope.
7. [Reserved].
8. For roof replacement on existing buildings with a roof slope of less than 2 units vertical in 12 units horizontal (2:12), and where the roof covering is removed and insulation remains, and where the required R-value cannot be provided due to thickness limitations presented by existing rooftop conditions (including heating, ventilating and air-conditioning equipment, low door or glazing heights, parapet heights, weep holes, and roof flashing heights not meeting the manufacturer's specifications), the maximum thickness of insulation compatible with the available space and existing uses shall be installed. Insulation used shall be minimum R-5 per inch. In areas where flashing may be terminated a minimum of 8 inches above the roof covering (including required insulation) insulation shall be a minimum of R-30ci.
9. R-value for roof assemblies with tapered insulation above deck with slope greater than 1/8 units vertical in 12 units horizontal (1/8:12) shall average R-30ci.
5. C503.3.1.1 Roof reflectance – Low slope roofs. Insert a new C503.3.1.1:
C503.3.1.1 Roof reflectance – Low slope roof. Full or partial replacements or retrofits of existing low-sloped roofs originally permitted prior to April 22, 2009 by substituting the original materials or roofing system with new materials shall utilize roofing products that meet or exceed an initial reflectance value of 0.72 or a three-year installed reflectance value of 0.5 as determined by the Cool Roof Rating Council or Energy Star.
Exception: Where more than 50% of the total gross area of the low-sloped roof is covered with vegetation associated with an extensive or intensive green roof as defined by the USEPA, the remainder of the roof shall have a reflectance value of a minimum of 0.30. The rooftop deck exception in C402.3 applies.
Exception: Where an existing ballasted roof is replaced with a ballasted roof, one of the following two sets of requirements must be met: (i) the reflectance value for the entire roof shall be a minimum of 0.30 and a minimum of 15 lbs/sq. ft. of ballast coverage over the entire roof shall be provided, or (ii) the reflectance value shall be a minimum of 0.72 or a three-year installed reflectance value of 0.5 as determined by the Cool Roof Rating Council or Energy Star.
Exception: When roof systems with a slope of a rise of a maximum 1/4 unit in a horizontal length of 12 units (1/4:12 pitch) are replaced with a built-up roofing system, the top layer aggregate must have a minimum reflectance of 0.3. The exposed top layer of aggregate must substantially cover the roof area, such that the maximum exposure of the underlying water-repellent layer is no more than 5% of the total area of the roof.
6. C503.3.1.2 Roof reflectance – Medium slope roofs. Insert a new C503.3.1.2:
C503.3.1.2 Roof reflectance – Medium slope roofs. Full replacement or partial replacement of 50% or more of the gross medium-sloped roof area over the preceding 36 months by substituting the original materials or roofing system with new materials shall meet the required reflectance values in C402.3.
Exception: Partial replacement of an existing roof of less than 50% of the gross medium-sloped roof area within the preceding 36 months must meet the required reflectance value in effect when the roof was originally permitted.
7. C503.3.1.3 Roof reflectance – Multiple slope roofs. Insert a new C503.3.1.3:
C503.3.1.3 Roof reflectance – multiple slope roofs. Roofs with multiple slopes shall be subject to those requirements applicable to the slope which covers the largest area of the building footprint.
8. C504.1 General. Revise to read:
C504.1 General. Buildings and structures, and parts thereof, shall be repaired in compliance with Section C501.3 and this section. Work on non-damaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter. Routine maintenance required by C501.3, ordinary repairs exempt from permit and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.
Where a building was constructed to comply with ANSI/ASHRAE/IESNA 90.1, repairs shall comply with the standard and need not comply with C402, C403, C404 and C405, but shall comply with C402.3.
9. C504.3 Roof repair – Roof reflectance. Add a new C504.3:
C504.3 Roof repair – Roof reflectance. Where an existing low-sloped roof is repaired to mend, fix, patch, cure, refurbish or otherwise salvage a portion of an existing roof in order to maintain or extend the life span of such roof, the portion of the roof that is repaired shall meet or exceed the reflectance value in effect when the roof was originally permitted.
(Added Coun. J. 9-14-16, p. 31143, § 1; Amend Coun. J. 3-29-17, p. 45477, § 9)