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.
|Technical information for controlling sound through windows