The Window Man Replacement Windows
703-978-9888
The Window Man Replacement Windows
703-978-9888

Sound Abatement

If noise is a problem in your home, there are several different glass options that can help reduce noise transmittance.

  • Sound abatement is measured in STC or Sound Transmission Class. The higher the STC the better. An example of STC perception:
    • +/- 3 STC change is just perceptible
    • +/- 5 STC change is clearly audible
    • +/- 10 STC change is twice as loud
  • STC is calculated by looking at the difference in the difference is sound via decibel outside the window and inside the window. For example:
    • If an sound is 60 dB on one side of the window and 30 dB on the other, than the STC rating of the window is 30.
  • An STC of 40 is the "privacy threshold"
  • Replacing single pane with double or triple pane windows will not significantly increase an STC rating.
  • The distance between panes of glass matter. The farther the panes are apart the higher the STC rating.
  • The same qualities that help insulate your windows also helps with sound abatement.
  • OITC is another sound abatement measurement that is not standardized at this time.
    • OITC stands for:  Outdoor-Indoor Transmission Class.
    • It includes frequencies that are lower the the common household sounds. For example: car traffic, airplane noise, trans and industrial process.
    • Just like with OTC the higher the rating the strong sound abatement performance.
  • Here are some common STC ratings for Double Hung Vinyl Windows:
    • Single Glazed Window: 24-26
    • Double Glazed Window: 24-30
    • Laminated Double Glazed: 32-35
    • Dual Window: 39-50
    • The added cost of the laminated glass upgrade from un-laminated double-pane is not justifiable from a strict STC perspective. The jump from single glazed or double glazed to a dual window configuration is remarkably valuable from a strict STC perspective.


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