The provisions of this chapter do not require any changes or improvements to be made to lawfully existing structures. However, when an improvement is made to any existing structure, the provisions of § 77-32 shall apply.
The following provisions shall apply whenever any improvement
is made to an existing structure located within any identified floodplain
area:
A.
No expansion or enlargement of an existing structure shall be allowed
within any floodway area that would cause any increase in the elevation
of the one-hundred-year flood.
B.
Any modification, alteration, reconstruction, or improvement of any
kind to an existing structure, to an extent or amount of 50% or more
of its market value, shall constitute a substantial improvement and
shall be undertaken only in full compliance with the provisions of
this chapter. The above activity shall also address the requirements
of the 34 Pa. Code Chapters 401 through 405, as amended, and the 2003
International Building Code (Sections 3402.1 and 1612.4) and the 2003
International Residential Code (Sections R105.3.1.1 and 323.1.4).
C.
The requirements of 34 Pa. Code Chapters 401 through 405, as amended,
and the 2003 International Residential Code (Sections R102.7.1 and
R105.3.1 and Appendixes E and J), or the latest revision thereof,
and the 2003 International Building Code (Sections 101.1.3 and 3403.1
and Appendix G), or the latest revision thereof, shall be utilized
in conjunction with the provisions of this section.
