(a) Openable wood frame windows in habitable rooms facing aircraft noise shall be replaced with new openable windows that have a minimum laboratory sound transmission class of at least STC thirty-five (35) dB if the existing window has:
(1) Missing or insecure glazing putty or other glazing materials; or
(2) Broken or cracked glass; or
(3) Operating sash that is not securely supported in its frame or does not close tightly against the frame.
(b) Openable wood frame windows that do not require replacement by subsection (a) of this section and that face aircraft noise shall be fitted with a secondary window that has an STC rating of at least twenty-five (25) dB. The secondary window may be mounted at the exterior or interior of the existing window and shall be completely trimmed and caulked in place.
(c) Openable metal frame windows in habitable rooms facing aircraft noise shall be replaced with new openable windows that have a minimum laboratory sound transmission class of at least STC thirty-five (35) dB if the existing window has:
(1) Jalousie louvered glass sash; or
(2) Missing or insecure glazing putty or other glazing materials; or
(3) Broken or cracked glass; or
(4) Operating sash that is not securely supported in its frame or does not close tightly against the frame.
(d) Openable metal frame windows in habitable rooms facing aircraft noise that do not require replacement by subsection (c) of this section shall be fitted with a secondary window that has an STC rating of at least twenty-five (25) dB with a spice of at least two (2) inches between the glass surfaces of the two windows. The secondary window may be mounted at the exterior or interior of the existing window and shall be completely trimmed and caulked in place.
(e) Fixed windows in habitable rooms facing aircraft noise shall be glazed with one-fourth (¼) inch glass unless they are part of an acoustic window assembly.
(f) Openable windows in habitable rooms that do not face aircraft noise shall be modified as follows:
(1) Jalousie louvered glass windows shall be replaced with windows that have a laboratory sound transmission class of at least STC thirty-five (35) dB.
(2) Windows that are not jalousie shall be fitted with a secondary window that has an STC rating of at least twenty-five (25) dB.
(g) Fixed glass windows in habitable rooms that do not face aircraft noise shall be glazed with one-fourth (¼) inch glass.
(§ 2, Ord. 2616, eff. June 20, 1996)