STC Rating for Windows Explained
STC (Sound Transmission Class) is an integer rating of how much sound is stopped from transferring from one area to another via windows, doors, walls etc. STC rating is an instrument measurement of how much noise is stopped. The STC ratings allow accurate comparisons.
The STC Ratings for single or double paned windows usually vary from 26 to 33. Soundproof Windows usually have an STC rating of 42-54. To put the ratings into context, an area with high traffic or airplane noise volume may require an STC of around 43 and an OITC of at least 36 to maintain a comfortable sound environment.
Please take into account, that the soundproof windows of many manufacturers work only together with your existing window.
Our soundproof windows can achieve up to 47 STC rating without adding secondary window to an assembly but just by using high quality glazing.
STC ratings of our windows
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Energy Plus uPVC, tested to ASTM E90: STC 32, STC 36 and STC 44 depending on the glass
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Soundproof glazing alone: up to STC 47, without a secondary window
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Aluminum: MB-79N and MB-86 up to STC 48, MB-104 Passive up to STC 52, MaxLight up to STC 45
Test reports are on our certification page. See also soundproof windows.
What improves the STC of a window
Thicker and laminated glass, panes of different thickness, a wider gap between panes and tight seals on all four sides. Tilt and turn windows help here because the sash is pressed against gaskets all around.
Window performance guide