![]() The higher the rating, the more sound is blocked from going through the material. At these very low ratings, most things happening on the other side of the wall can be heard. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. What works well for normal speech volume between two adjacent apartment rooms may fail miserably when you host garage band practice in your basement.Īlso, an acceptable STC rating for walls may be different from the acceptable STC rating for floors, depending on whether the walls are shared by a neighbor, or a room is directly beneath a kitchen with heavy traffic. What is a good STC rating ?Ī good STC rating is largely determined by the type of noise issue you are trying to solve, and the results you are trying to achieve. If your results most closely resemble the curve for an STC rating of 50, then that would be the rating for the material you tested. The difference is used to calculate the transmission loss of the material at each of the frequency bands.Įach transmission loss value is plotted on a graph then compared to a standard set of STC contours, with the closet matching contour determining the STC rating of the material. The sound pressure levels in both rooms are compared at various one-third-octave band frequencies from 125 Hz to 4000 Hz. ![]() Two rooms with measurement equipment are divided by the material, one designated as the source room, the other as the receiving room. ![]() The first step in rating a product is to determine the transmission loss of the material at various frequencies. Determining ratings for windows, walls, and ceilings all happen the same way defined by the ASTM E90 standard. ![]() How to Measure STC Rating?Ĭalculating STC ratings can seem a little bit tricky at first, but it’s not as complicated as you might think. The NRC rating is important when you are trying to reduce echo and improve the sound quality in a room. The STC rating is important when you are trying to reduce the amount of sound entering or leaving a room. While the STC rating tells us how much sound is blocked from going through a product, the NRC Rating tells us how much sound is absorbed by a product. People often mention NRC and STC ratings in similar contexts, but they are slightly different rating systems. The sound transmission class was first introduced in 1961 and has since become the standard single-number metric to describe sound blocking materials. It is especially important in commercial construction. By understanding this rating of materials, we know how much sound will be blocked from going through those materials. When people are evaluating building materials and acoustical products for sound reduction, they rely on the sound transmission class or STC rating of the product. Sound transmission class ratings generally come up in places where we want to keep sound either in or out, like a sound studio, a road-facing exterior wall, or a bedroom above the garage. If you’re looking to learn more about STC rating, you’re likely planning a construction project, and it’s probably not a tool shed. Posted by AcousticalSurfaces on 3:29 pm | Leave a Comment Understanding Sound Transmission Class (STC) Rating
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