![]() STC is highly dependent on the construction of the partition. Materials which can improve STCs in walls include mass-loaded vinyl (MLV), standard drywall, “soundproof” drywall, such as QuietRock, Supress, SoundBreak, or ComfortGuard, and damping compounds such as Green Glue.ĭue to their high mass, concrete and concrete block walls have good TL values (STCs in the 40s and 50s for 4-8″ thickness) but their weight and added complexity of construction limit their use for DIY Vocal Booths. The increase from 40 to 45 does not sound like much (90% versus 95+% in reductions) – but going from 90% to over 95% means that 60% of the remaining noise was removed every number represents a large amount of noise.ģ3 Single layer of 1/2″ drywall on each side, wood studs, no insulation (typical interior wall)ģ9 Single layer of 1/2″ drywall on each side, wood studs, fiberglass insulationĤ5 Double layer of 1/2″ drywall on each side, wood studs, batt insulation in wallĤ6 Single layer of 1/2″ drywall, glued to 6″ lightweight concrete block wall, painted both sidesĥ0 10″ Hollow CMU (Concrete Masonry Unit)ĥ4 Single layer of 1/2″ drywall, glued to 8″ dense concrete block wall, painted both sidesĥ5 Double layer of 1/2″ drywall on each side, on staggered wood stud wall, batt insulation in wallĥ9 Double layer of 1/2″ drywall on each side, on wood stud wall, resilient channels on one side, batt insulationĦ3 Double layer of 1/2″ drywall on each side, on double wood/metal stud walls (spaced 1″ apart), double batt insulationħ2 8″ concrete block wall, painted, with 1/2″ drywall on independent steel stud walls, each side, insulation in cavities Small increases can mean a lot of extra noise reduction. A change from 30 to 45 represents a noise reduction of over 95%. An increase from 30 to 40 means 90% of the noise is reduced. Why the STC Rating Numbers are so close in Value? STC rating measurement uses a special scale like the Richter Scale for earthquakes. The rating provides no evaluation of the barrier’s ability to block low frequency noise, such as the bass in music or the noise of some mechanical equipment.Ģ5 Normal speech can be understood quite easily and distinctly through wallģ0 Loud speech can be understood fairly well, normal speech heard but not understoodģ5 Loud speech audible but not intelligibleĤ5 Loud speech not audible 90% of statistical population not annoyedĥ0 Very loud sounds such as musical instruments or a stereo can be faintly heard 99% of population not annoyed.Ħ0+ Superior soundproofing most sounds inaudible The STC rating is based on performance with frequencies from 125 to 4000 Hertz (the speech frequencies). The STC ratings allow accurate ‘apple to apple’ comparison of materials for soundproofing.įirst of all knowing STC rating of a barrier helps to measure your expectation of what can be achieved when using various types of soundproofing materials. ![]() In general, a barrier with higher STC rating blocks more noise from transmitting through a partition. The Sound Transmission Class (STC) is a single-number rating of a material’s or an assembly’s ability to resist airborne sound transfer at the frequencies 125-4000 Hz. Custom Imprint on Acoustic Sound Blankets.Customized Acoustic Sound Blankets Menu Toggle.FlexTee Stand for wraparound room acoustic control ( with Mini Mic pole for VOMO mount).Vocal Condenser Microphone – Deluxe Version.Quiet Ventilation Fan with Muffler (6 Inch, 320 cbm/hr).Audio Recording Equipment and Essentials Menu Toggle.Noise control and Sound Barrier products.Mobile Sound Booth – SPB Soundproof(er).Pro Sound Blankets for Recording Studio Acoustic Room Treatment.Acoustic Noise Reduction Panels for sound absorption. ![]() ![]()
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