(a) To be eligible for catastrophe property insurance, structures located in the designated catastrophe areas specified in §5.4008 of this chapter (relating to Applicable Building Code Standards in Designated Catastrophe Areas for Structures Constructed, Repaired or to Which Additions Are Made On and After September 1, 1998, and before February 1, 2003) and which are constructed, repaired, or to which additions are made on and after February 1, 2003, and before January 1, 2005, shall comply with the 2000 International Residential Code or the 2000 International Building Code, as revised by the Texas Revisions to the International Residential Code and the Texas Revisions to the International Building Code, and all of which are adopted by reference to be effective February 1, 2003. The codes are published by and available from the International Code Council, Publications, 4051 West Flossmoor Road, Country Club Hills, Illinois, 60478-5795, (Telephone: 800-214-4321), and the Texas Revisions to the International Residential Code and the Texas Revisions to the International Building Code are available from the Windstorm Inspections Section of the Inspections Division, Texas Department of Insurance, 333 Guadalupe, P.O. Box 149104, MC 103-3A, Austin, Texas, 78714-9104 and the Texas Department of Insurance website at www.tdi.state.tx.us. The following wind speed requirements shall apply:
  (1) Areas Seaward of the Intracoastal Canal. To be eligible for catastrophe property insurance, structures located in designated catastrophe areas which are seaward of the Intracoastal Canal and constructed, repaired, or to which additions are made on or after February 1, 2003, shall be designed and constructed to resist a 3-second gust of 130 miles per hour.
  (2) Areas Inland of the Intracoastal Canal and Within Approximately 25 Miles of the Texas Coastline and east of the Specified Boundary Line and Certain Areas in Harris County. To be eligible for catastrophe property insurance, structures located in designated catastrophe areas specified in subsections (b)(2)(A) and (b)(2)(B) of §5.4008 of this chapter and constructed, repaired, or to which additions are made on or after February 1, 2003, shall be designed and constructed to resist a 3-second gust of 120 miles per hour.
  (3) Areas Inland and West of the Specified Boundary Line. To be eligible for catastrophe property insurance, structures located in designated catastrophe areas specified in subsection (c) of §5.4008 of this chapter and constructed, repaired, or to which additions are made on or after February 1, 2003, shall be designed and constructed to resist a 3-second gust of 110 miles per hour.
(b) Repairs, alterations and additions necessary for the preservation, restoration, rehabilitation or continued use of a historic structure may be made without conformance to the requirements of subsection (a) of this section. In order for a historic structure to be exempted, at least one of the following conditions shall apply to the structure:
  (1) The structure is listed or is eligible for listing on the National Register of Historic places.
  (2) The structure is a Recorded Texas Historic Landmark (RTHL).
  (3) The structure has been specifically designated by official action of a legally constituted municipal or county authority as having special historical or architectural significance, is at least 50 years old and is subject to the municipal or county requirements relative to construction, alteration, or repair of the structure, in order to maintain its historical designation.

Source Note: The provisions of this §5.4009 adopted to be effective February 1, 2003, 28 TexReg 683; amended to be effective August 17, 2004, 29 TexReg 7989