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    STC Ratingis universal tool for sound transmission class refer to how much reduction is possible after installation of particular item i.e.
    doors, windows, brick wall or glass partition.

    If 100 is the value it means the sound is completely stopped but usually  to human ear the following things are heard for particular stc rating



















         







    For our wall of 6’’ thick the stc class is 35 (hollow block) to 42 (for brick wall) and openable wooden doors have stc class of about 22
    An increase from stc 28 to stc 38 means  90%  of the noise is reduced

    So from above it is clear that above 40 stc class it is much peaceful but many times after installation it is found that walls & doors
    transmit more sound than the installed window solutions due to cracks, leakages and space bellow doors.

    Stc class for single glass and double glaze sliding windows are as follows

    28        Normal sliding window
    32        Double glaze windows

    So it can be concluded that installation of only double glaze windows will not solve the problem noticeably.
    RollwinIndia has its own product for normal sliding windows where the sound coming from shutter and track is reduced by gasketing
    and piles click to view

    But by installing double glaze or one more single glaze sliding with epdm and thicker piles of windows will appreciably reduce noise.

  • list of common noises and its decibel levels:

  1.    Aircraft during take off -160
  2.    Firework -140
  3.    Chain saw machine -105
  4.    Noisy office -90
  5.    Vacuum cleaner - 75
  6.    City traffic 85 TO 95
  7.    Normal conversation -65 TO 70
     
  • Noise levels of 85 decibels & over will be painful and  likely to cause hearing damage.
Technical information for controlling sound through windows
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Stc value
What you can hear
25
Normal speech can be understood quite easily and noticeably through wall
30
noisy speech can be understood fairly well, normal speech heard but not understood
35
Loud speech audible but not understandable
40
Onset of privacy
42
Loud speech capable of being heard as a whisper or soft
45
Loud speech not capable of being heard; 90% of statistical population not upset
50
Very loud sounds such as musical instruments or a stereo can be faintly heard; 99% of
population not upset.
60
advanced soundproofing; most sounds impossible to hear
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