Appendix IV. REQUIRED SOUND TRANSMISSION CLASS RATINGS

Latest version.

403.2. Compliance with the aircraft sound isolation performance standards shall be established by certification from a registered professional architect or engineer that when constructed in accordance with the approved plans and with quality workmanship, the building shall achieve the specified interior noise levels, or by the use of assemblies having the Sound Transmission Class ratings specified in Table 403.2.

TABLE 403.2. MINIMUM SOUND TRANSMISSION OF ASSEMBLIES

% Openings	Noise Reduction	Exterior Walls and Roofs	Exterior Doors, Windows and Sloped Glazing
1—25%	35 Ldn 30 Ldn 25 Ldn	50 45 39	42 37 28
26—70%	35 Ldn 30 Ldn 25 Ldn	55 50 45	45 41 37

Standard for Sound Control/1988

                    
                        var val = document.getElementById('citecontent').innerHTML;
                        art.dialog.defaults.title = window.location.href;
                        art.dialog.data('cite', val);
                        art.dialog.data('homeDemoPath', '/Scripts/plus/artDialog/');
                        art.dialog.open('/Scripts/plus/artDialog/citeiframe.html');