The provisions of Section R502 of IECC-RE are adopted by reference with the following modifications:
1. Revise the first two sentences of Section R502.1 to read:
"Additions to existing buildings shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portion of the existing building to comply with this code. Additions shall not create an unsafe or hazardous condition or overload existing building systems."
2. Revise the exceptions to Section R502.2 to read:
"1. Where the simulated performance option in Section R405 is used to comply with this section, the annual energy cost of the proposed design is allowed to be 110 percent of the annual energy cost otherwise allowed by Section R405.2.
2. Where the Total UA, as determined in Section R402.1.5, of the existing building and the addition, and any alterations that are part of the project, is less than or equal to the Total UA generated for the existing building.
3. Where complying in accordance with Section R405 and the annual energy cost or energy use of the addition and the existing building, and any alterations that are part of the project, is less than or equal to the annual energy cost of the existing building. The addition and any alterations that are part of the project shall comply with Section R405 in its entirety."
3. Revise Section R502.3.1 by replacing "building" with "building."