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STC: Things to Remember When Choosing Noise Insulation
- Adding Insulating Material: Noise insulation can be installed inside a wall, under a floor, or above
a ceiling to improve the STC ratings. Consider Peacemaker Noise Insulation, a soundproofing solution
available in three thicknesses. Peacemaker Noise Insulation is a flexible rubber soundproofing material
that is used to reduce the transmission of noise through walls, floors, and ceilings. Noise insulation
priced at less than $1.00/sq.ft. - Higher STC ratings generally are better. However, don’t forget that STC ratings only take into account
sounds over 125Hz. This means that extremely low frequencies don’t register on the STC rating scale,
thus when a sound on one side of a wall is below 125Hz, the ability of the wall to block sound cannot be
calculated. - STC is not a direct measure of how many decibels of sound a wall can stop. If a wall has a rating of 35,
it does not mean that the wall stops 35dB of sound. - You can’t add STC ratings together. For instance, if you have an STC of 40 on one wall and decide to
add another wall with an STC of 20, the STC of both walls combined will not be 60. Instead, the STC will
be calculated using logarithms, and will probably produce a rating of about 45. When soundproofing rooms,
adding materials with higher STC ratings will considerably reduce the sound being transmitted through walls,
windows, floors, etc. - Adding Mass: In DIY soundproofing, it’s important to remember that the weight or thickness of a partition
has a lot to do with an object’s ability to block sound. When the mass of a barrier doubles, the STC rating
increases by about 5dB, which is enough of a difference to be noticed. - STC does not provide enough information about a material’s isolation properties.
- Different Materials=Different Results. The performance of noise barriers depends heavily on the frequencies
of sound you are trying to block. Different frequencies of sound produce different STC ratings.