The provisions of Section R501 of IECC-RE are adopted by reference with the following modifications:
1. Revise Section R501.1 to read:
"The provisions of this chapter shall control additions, alterations, repairs and changes of occupancy to and relocation of existing buildings."
2. Revise Section R501.1.1 to read:
"Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code. Unaltered portions of the existing building or building system shall not be required to comply with this code."
3. Revise Section R501.2 to read:
"Additions, alterations, repairs or changes of occupancy to or relocation of an existing building or existing building system shall comply with Section R502, R503, R504 or R505, respectively, in this code. Alterations where unconditioned or low-energy space is changed to conditioned space shall comply with Section R502."
4. Revise Section R501.3 to read:
"Devices and systems that are required by this code shall be maintained in conformance to the code edition under which installed. The requirements of this chapter shall not provide the basis for removal or abrogation of energy conservation, fire protection or safety systems and devices in existing buildings."
5. Revise Section R501.4 to read:
"Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in this code and the other Chicago Construction Codes."