Stc ratings of materials pdf. See data from the National Research Council of Canada.

Stc ratings of materials pdf simple 2X4 wall containing InsulGreen batts achieves an STC 50, as tested STC ratings are determined in a laboratory under controlled conditions. A STC rating of 55 is required for inter-tenancy walls. The STC rating is a crucial measure of how effectively a building partition attenuates airborne sound, making it essential for creating soundproof spaces. Fiberglass Phone: 888-815-9691. about 125Hz to 4Khz) and fit to a curve. 12 of the LABC. transfer at the frequencies 125-4000 Hz. Seal all gaps between the walls and the floor and ceiling. 15/8" (41 mm) Steel Studs *Indicates value is an estimate Steel Framing STC Values Sound Control JM Formaldehyde-free insulations help reduce STC Ratings & Steel Stud Framed Walls . A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. Flat Panel, STC-58 6 in. Resilient channel can improve the STC rating of an assembly. The STC rating has been in existence for many years and is based on speech sounds. frequencies. J2247-13-303-11-R0 Insulation Included includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Flanking sound patterns, the integrity of the wall, and floor and ceiling construction are important factors in effective sound control. If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. In the fi eld, fl anking noise, quality of material and construction practices can lead to widely varied STC’s for the same assembly. STC ratings are determined by laboratory tests of a This STC Wall Calculator estimates the Sound Transmission Class (STC) rating of a wall assembly based on various materials and configurations. For additional information on sound test ratings please Aug 29, 2016 · SOUND TRANSMISSION CLASS (STC) – An integer rating of how well a building partition such as an interior wall, floor/ceiling, door, window, or exterior wall attenuates airborne sounds ranging between 125 and 4,000 Hz. 27 — Standard method for evaluating ceramic floor tile installation systems Passes cycles 1-6 C627 Light commercial Light Light STC Ratings & Product Comparison What are STC Ratings? An STC (Sound Transmission Class) rating is a single member rating that is used to specify and compare different partitions according to the reduction in noise levels that the partition provides. The STC value is derived by fitting the plotted TL data to a reference contour defined by the ASTM E413 Classification Standard . The most common single rating search for across the internet is STC 50. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. † Superior sound damping, cost-efficient material that is easily finished and decorated in the same manner as standard gypsum board. This rating is most appropriate for comparing performance of interior partitions to be used between rooms where there is not strong low-frequency sound. This update provides for an understanding of STC and provides an expanded material and construction May 13, 2022 · The higher the STC rating, the less noise is transmitted from the assembly. Ratings are determined by broadcasting a specific auditory tone near the material, and measuring dB on both sides. STC & IIC RATINGS FOR FC-214 FLOOR COVERING STC IIC TEST NUMBER Carpet & Pad 48 54 NRC 1059 & 1060 Vinyl 47 35 NRC 1063 & 1064 Lightweight Concrete, Carpet & Pad 56 72 NRC 1053 & 1054 Lightweight Concrete and Vinyl 56 48 NRC 1051 & 1052 Gypcrete, Carpet & Pad® 52 63 NRC 1076 & 1077 Gypcrete® 53 43 NRC 1085 & 1086 STC & IIC RATINGS FOR UL L528 better reduction levels. simple 2X4 wall containing InsulGreen batts achieves an STC 50, as tested the STC value, the better a construction reduces the transmission of sound. STC Standards For reference, most building codes throughout the US require an exterior wall to have an STC rating of 50, standard house walls and wooden doors have an STC rating of 33, windows range from 18 to 38, while studio-level soundproofing requires a rating of at least 45. Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. Taking this information, a curve is made which is then compared to standard STC curves. Serious Materials cannot guarantee actual STC ratings. Jul 4, 2024 · STC is another critical metric that quantifies how well a wall or other vertical partition blocks sound. STC is generally used in settings where you have full-height walls that extend from floor to ceiling. (Refer to manufacturer's specifications). • Staggering the studs or using dual studs can Sound Transmission Class (STC) method of rating airborne sounds evaluates the comfort ability of a particular living space. While neither of these materials is useful for absorbing acoustics with a high degree of accuracy, they still have an STC rating: Single-pane window STC rating = 25; Masonry wall STC rating = 60 a wall, floor or roof. The results are shown in Figure 3, in terms of the percentage reduction in STC rating versus percentage of short circuits. Serious Materials cannot guarantee actual STC and the resulting STC—heavier concrete masonry walls have higher STC ratings. The U. 27 0. The higher the rating the greater the degree of noise reduction. To determine the STC ratings for windows, walls and ceilings you can do it the same way as defined by the ASTM E90 standard. Class (STC) rating. performance, the selection of a floor/ceiling system attaining a minimum 60 STC and IIC is recommended. When plotted in this way, the STC rating falls nearly linearly with in significantly improve an IIC rating. ” “With the cavity half-˛lled with absorptive material, the sound The amount of airborne sound blocked from transmitting through a partition is measured in a sound transmission class (STC) rating. 35 38 Typical wall construction with 2 layers of 16mm(5/8") Plasterboard on each side of 95x35mm (4 x 11/2 Sound Transmission Class (STC) is a single-number metric used to measure the sound isolation performance of walls and flooring-ceiling assemblies in a laboratory. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. Alternatively, acousti- STC ratings listed are intended to serve as a guide. Dec 22, 2022 · What Are STC Ratings? An STC label delineates how partitions and walls effectively block sound and reduce noise. The higher the STC value, the better its insulation. [1] Section 1207 of International Building Code 2006 states that separation between dwelling units and between dwelling units and public and service areas must achieve STC 50 (STC 45 if field tested) for both –Veneer plaster partitions achieve up to 63 STC in steel-framed resilient systems and up to 52 STC in wood-framed resilient systems –Have achieved 1- to 4-hr. STC ratings are determined in a laboratory under controlled conditions. 48 Statistical Tolerance ± 2. AccuQuiet® DX38 On wood frame construction AccuQuiet®DX38 can achieve IIC ratings up to 60 db and STC ratings up to 59 db. 0 International licence, with the exception of Jan 10, 2025 · Precast walls will usually come with an STC rating to save you the trouble of how determining the STC rating of a wall yourself. OITC. elementary discussion of STC, provides some STC ratings for common building materials and limited exterior and interior wall construction configurations, and describes a method to determine composite STC value of a wall containing a window or door. Flat Panel, STC-55 Frequency, HZ STC Ratings & Steel Stud Framed Walls Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. jm. STC ratings of individual partition components cannot be added together to arrive at an assembly STC rating. Typically a two (2) or more point change %PDF-1. Insulation will noticeably improve the STC rating of an assembly. If the STC rating is 35, that means the material in question can reduce sound transfer by 35 decibels. com. As a general rule the higher the STC rating, the better the partition’s acoustical performance. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall Jun 15, 2024 · STC ratings measure the sound reduction capabilities of building materials, with ratings ranging from 0-100. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. construction team and the design team to take this into account for higher STC ratings. This avoids down-rating test results because of noise levels that are least objectionable to people. resist the transmission of sound. Products Applications The material in this publication is licensed under a Creative Commons Attribution-4. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 STC (Sound Transmission Coef˛cient) acoustical performance than nominal equivalent thickness, approximately 265% higher density mineral ˛bre (rock/slag wool) batts. 49/1. This value represents your STC rating. It’s like the cousin of CAC but focuses on walls instead of ceilings. The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. J2247-13-303-11-R0 Insulation Included –Veneer plaster partitions achieve up to 63 STC in steel-framed resilient systems and up to 52 STC in wood-framed resilient systems –Have achieved 1- to 4-hr. Insulation Type STC. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers excellent fire resistance ratings and Sound Transmission Class (STC). What is STC? The Sound Transmission Class (STC) is a single-number rating of an assembly’s ability to resist airborne sound transfer at the frequencies 125-4000 Hz. The STC rating then has great influ-ence on the construction of walls and floors. “These single-number ratings correlate in a general way with subjective impressions of sound construction team and the design team to take this into account for higher STC ratings. However, when building hotels, the STC of 55 for demising walls and STC 50 for corridor walls isn’t a building code requirement – this is what we call a “brand The final STC/OITC rating of the window assembly could vary because of the influence of the framing members and the construction of the window assembly. The higher the STC rating, the better the partition performs in reducing sound transmission. High STC ratings help reduce noise transmission and create a focused environment in residential, commercial and educational spaces. Particularly, in the International Building Code, STC 50 is required for dwelling units to adjacencies. • Metal framed walls have a higher STC rating than . Note that when trying to assess the total performance of a number of materials, STC points do not add up. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. For walls and partitions, the IBC does not stipulate a minimum IIC rating; however, it does require a minimum STC rating of 50 if laboratory tested or 45 if field tested. Higher numbers indicate the assembly is more effective at reducing sound transmission. Of course, the rating is determined as an average based on the different frequencies between 125 Hz to 4000 Hz. This rating is based on the requirements that the value of transmission loss at any of the eleven measuring ceiling assemblies with positive numbers only in ascending degrees of efficiency - the higher the rating, the greater the sound insulation. The Maxxon floor underlayments and Acousti-Mat® are but single components of an effective sound control system. Email: info@commercial-acoustics. 8 in. † All SoundBreak XP Gypsum Board designs were tested resilie t channel, and batt insulation in the cavity. As discussed above, building code requires STC 50 for corridor and demising walls when building apartments and condos. The higher the rating, the better that material is at attenuating sound transmission of the most common frequencies. ES with EZ-SNAP Technology STC 28 / OITC 20 R-10 Faced 202-96 Insulation Over the Girts STC 21 / OITC 17 No Insulation STC 29 / OITC 20 R-13 Faced 202-96 Insulation Over the Girts Assemblies tested in accordance with ASTM E 90. Adding additional layers of drywall can improve the STC rating of an assembly. In general, a higher STC rating blocks more noise from transmitting through a partition. Here’s an example. Increased wall thickness (such as additional layers of gypsum board) or additional materials (such as resilient channel) are typically needed to reach STC 50. Standard Method for STC (Sound Transmission Coef˛cient) acoustical performance than nominal equivalent thickness, approximately 265% higher density mineral ˛bre (rock/slag wool) batts. However, the conversion is not accurate in every case and should serve only as an estimate. Understanding STC ratings for drywall can be complex. Construction practices have an influence on final STC ratings. • Doubling the mass of a wall assembly does not double the STC rating. Implementation of the appropriate rating system is important because OITC and STC ratings are not linearly related, and the achievement of a strong STC rating does not necessarily correlate with a similar OITC rating. better reduction levels. SoundBook Gridstone Ceiling Attenuation Guide. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. They are logarithmic values and cannot simply be added. As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. The test measures the airborne sound attenuating characteristics of partitions, floors Jan 20, 2021 · IIC ratings up to 59 db and STC ratings up to 58 db. An STC rating is given in terms of points, and the data are given in terms of decibels. You might get something around STC 35. See data from the National Research Council of Canada. OITC ratings determined in accordance with ASTM E 1332. Both materials are tested for acoustic performance and both meet or exceed building code requirements for partitions depending on the assembly. To achieve this rating and reduce noise transmission between rooms: Add R-11 fiberglass insulation in the cavity between the gypsum board layers. Rankings are then calculated using a non-combined logarithmic Phone: 888-815-9691. S. Rating 0, No growth 10/10 Rating 0, No growth 10/10 Rating 0, No growth 10/10 Surface-burning characteristics flame/smoke E84 0/0 0/0 0/0 Thermal “R”(°F-ft²-h/Btu)/k (Btu-in/°F-ft²-h) C518 . Address: 6301 N Florida Ave Tampa, FL 33604 Feb 19, 2024 · How is the STC Rating Determined? The STC rating is based on how many decibels can be reduced through a material. The STC rating system looks at the amount of noise mitigation provided by the assembly over a broad range of frequencies and a single number is calculated as its rating. 111). 4 %âãÏÓ 934 0 obj /Linearized 1 /O 936 /H [ 973 718 ] /L 7142315 /E 89017 /N 175 /T 7123516 >> endobj xref 934 22 0000000016 00000 n 0000000791 00000 n 0000001691 00000 n 0000002150 00000 n 0000002233 00000 n 0000002324 00000 n 0000002409 00000 n 0000002508 00000 n 0000002568 00000 n 0000002694 00000 n 0000002754 00000 n 0000002874 00000 n 0000002934 00000 n 0000003050 00000 n Achieving an STC 50 with simple 2X4 wall construction is rare. Wall Assembly Acoustical Testing Results. Some common assembly ratings are shown in Table 1. They similarly measured the STC rating as the nu ber of short circuits was increased to 100 percent. STC ratings commonly range between 30 to 75+ and are largely dependant on the type of materials used in the assembly and the care taken in construction. Typically a two (2) or more point change Achieving an STC 50 with simple 2X4 wall construction is rare. STC 'field-STC' (FSTC) is usually lower than the laboratory-measured STC. Drywall between double studs can dramatically reduce the STC rating of an assembly. • Metal studs perform better than wood studs by about 5db. STC is highly dependant on the construction of the partition. Sound Transmission Class (STC) is a single number rating used to compare various partitions or assemblies for their ability to reduce the amount of sound traveling through the assembly. 7 %âãÏÓ 2744 0 obj >stream ŽËfÂl¸Ùûõ] šÁ¬‹'ÂxüÈcqàîÌ»$"_¹¨éadßQ‡}xBµxåuÉÎVæ-Ãv/C »AÊ~Oef i†ãš` Ëä ½ ëZòƒ& STC ratings listed are intended to serve as a guide. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has The three most important ratings used in building assembly testing are: † STC (Sound Transmission Class) – used to rate air transported sound transmission between two areas separated by an interior wall or in comparing the sound transmission ratings of building assemblies using different materials: Jan 20, 2022 · Choosing the right noise and reverberation materials for your home, apartment or business is a science. Dec 7, 2023 · In simpler terms, the STC rating offers an indication of how soundproof a wall or floor/ceiling structure may be. Glass size and glazing system will affect STC rating. The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. What is an STC rating? Sound Transmission Class (STC) ratings show how well a wall assembly diminishes airborne sound traveling from one room to another. com Or call:1-800-654-3103 Wood Fr aming STC and IIC Values Sound Control STC 51, IIC 78 (STC 52, IIC 49, with vinyl floor in place of carpet and pad) 2" x 8" (51 mm x 203 mm) wood joists: 1/ Dec 31, 2024 · Since comparing materials across multiple frequencies can be cumbersome, the STC rating simplifies this process by assigning a single-number rating that represents the overall performance. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall often quite inaccurate in comparing an assembly of materials having widely differing TL-frequency characteristics. The estimate could easily be off by as much as +/- 4 dB. Add a second layer of gypsum board to each side. STC values are calculated by measuring Sound transmission class (STC) measured in decibels Sound Transmission Class (STC) - The STC rating is a (dB) is the standard method for rating sound attenuation single number value quantifying the ability of a material to characteristics of glass products and window assemblies. Dec 30, 2022 · For instance, if you recorded 16 different frequencies, divide your total by 16. installed cost than other sound reduction partitions with high rated STC values that are thinner than traditionally built high rated STC wall partitions providing increased usable floor space. The ASTM test procedure explains the use of STC in the following excerpt from E413. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers Recommended STC Ratings on Corridor & Demising Walls. The higher the STC, the better the airborne noise control performance of the structure. In the absence of test data, standard calculation methods exist, which tend to be conservative. CAC and floors. Therefore, flooring materials do not significantly reduce the Sound Transmission Class (STC), which is a rating of airborne sound transmission loss of the floor/ceiling assembly or the partitions. STC Standards For reference, most building codes throughout the US require an exterior wall to have an STC rating of 50, standard house walls and wooden doors have an STC rating of 33, windows range from 18 to 38, ile wh 1206 of the IBC requires minimum STC and IIC ratings of 50 if laboratory tested or 45 if field tested. That is because it is one of the few STC, or Sound Transmission Classification, ratings that are mandated by building code. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. The right-hand column shows the results of acoustical tests done on STC: 54 - Fire: 1 Hour STC: 74 - Fire: 1 Hour *UL/ULC Design #: U376, W313 *UL/ULC Design #: W313 U341, U376, HIGHER PERFORMANCE, HIGHER RELIABILITY, LOWER COST SOUNDPROOFING SOLUTIONS. Figure 1 shows measured STC ratings for single-leaf concrete block walls from a number of published sources. 6. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. Address: 6301 N Florida Ave Tampa, FL 33604 take this into account for higher STC ratings. A single-leaf concrete block wall is heavy enough to provide STC ratings of about 45 to 55 when the block surface is sealed with paint or plaster. What is an The three most important ratings used in building assembly testing are: † STC (Sound Transmission Class) – used to rate air transported sound transmission between two areas separated by an interior wall or in comparing the sound transmission ratings of building assemblies using different materials: Jan 1, 2020 · Although STC is derived from sound transmission decibel loss, STC is a rating (with no decibel units). E413-87 in an acoustical wall. (3) “The greater the fraction of the cavity ˛lled with absorption, the higher the sound transmission loss. Within a dwelling an internal wall with a STC rating of 45 will usually "muffle" television, telephone ringing and conversation in an adjoining room. As a rule of thumb, INR ratings can be converted to IIC ratings simply by adding 51 to the plus or minus INR number. If your curve matches other fixtures in the range of 50, for example, you’ll receive a similar STC rating. 32” oc – STC 38 24” oc – STC 36 16” oc – STC 32 12” oc – STC 32 60 50 40 30 20 10 0 63 125 250 500 1000 2000 4000 TRANSMISSION LOSS (dB) FREQUENCY (Hz) 16 ga – STC 38 25 ga – STC 43 20 ga – STC 38 JM ACOUSTICAL INSULATION PRODUCTS Sound & Fire Block® Mineral Wool: Mineral wool is the clear choice if you need fire protection. Sound Resistance Rating – STC 56 Sound Test: OL 17-0221 THICKNESS: 4-3/4" FIRE RESISTANCE BASED UPON: UL/cUL Design U309 ACOUSTICS: Sound Resistance Rating – STC 39 Sound Test: NOAL 19-0708 THICKNESS: 4-3/4" FIRE RESISTANCE BASED UPON: UL/cUL Design U309 ACOUSTICS: Sound Resistance Rating – STC 51 Sound Test: OL 15-0503 Single Layer 5/8 (STC) is the mass per unit area: the higher it is, the better. For example, MLV has an STC rating of around 27. Table 18. This might seem a little difficult to do, but as long as a person has somewhat of an idea on how the ratings work, it is a pretty Nov 7, 2016 · STC 50 Walls. Decibels This document provides sound transmission class (STC) ratings for various glass and wall constructions. The consid­ A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). In general, it is believed that a higher STC rating is preferable. transmission, an OITC rating is designed to account for sound transmission from typical outdoor sounds which consists of frequencies lower than an STC rating. ASTM Standards define the procedures and methodology for calculating STC (E901 for Laboratory Test Methods and E4132 for Rating Classifications). 39/1. To determine the specific STC ratings of glass and a double stud wall) can yield an STC rating as high as 63 or more (See Technical Bulletin 20. Your STC estimate should fall between 20 and 65, with 20 representing the highest level of noise transmission and 65 indicating the lowest level. 10 of the LABC) is to be used for acceptance of individual jobs only. An STC of 50 or above is generally considered a good airborne noise control rating. 5. That is not the case when using InsulGreen A batts. Laboratory and field tests to establish general approvals require an STC rating of 50 for walls and floors and an IIC rating of 50 for floors. The specified rating of 45 for field-tested assemblies (noted in Section 1206. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. A Higher STC Rating will degrade the ability to hear and understand speech. STC Standards For reference, most building codes throughout the US require an exterior wall to have an STC rating of 50, standard house walls and wooden doors have an STC rating of 33, windows range from 18 to 38, ile wh %PDF-1. One single number rating method which has been recently proposed is the sound transmission class (STC). Systems attaining ratings less than 55 STC and IIC provide only marginal acoustical performance. What Is an STC Rating? The STC May 19, 2023 · This article will explore the six variables that affect STC ratings in walls. STC ratings for different wall and floor assemblies are dependent on such factors as the material types used, their mass, and air space included in the assembly, if any. to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. If you have an STC 33 wall and decide to add another sheet of drywall with an STC of 20 you do not get a finished wall with an STC of 53. STC rating determined in accordance with ASTM E 413. Visit our website atwww. 1. 1. Understanding STC Ratings for Drywall. The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. The first step in figuring out the STC ratings of materials is to determine the transmission loss of the material at various frequencies. For additional information on sound test ratings please contact your local AccuCrete® Representative. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 Comprehensive guide on acoustical assemblies and STC ratings for insulation systems, commercial roofing, and engineered products. 5 STC Weight Per Unit Area - (W) - psf 40 50 60 70 80 90 100 Sound Transmission Class (STC) Flat or Ribbed Panels 65 60 55 50 45 40 Fig. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. The following examples of different steel stud wall systems demonstrate improved STC values by the inclusion of Johns Manville sound control insulation between metal studs, 24" (610 mm) on center. An STC rating is a single-number rating calculated in accordance with standard ASTM E413 using the Transmission Loss measured at 16 one-third octave bands from 125 Hz to 4000 Hz. *OITC is estimated based on this test. As an example, let’s take a typical single-pane window and a masonry wall. Caution: You cannot add STC ratings. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 on each side (Tested STC): o Cellulose STC41 o Fiberglass or mineral fiber STC38 o Icynene STC37 o The installed performance in batt insulation systems is typically well below that of their tested STCvalues. ” “With the cavity half-˛lled with absorptive material, the sound Oct 10, 2024 · If the window has an STC rating of 30, the final STC with the addition of the blanket is not 65. Transmission Class (STC) rating of a wall separating two adjacent classrooms is 50. Materials Calculator Product Sustainability Project Profiles 1-800-NATIONAL PDF. You would have to do more serious calculations to find the right answer, or test the blanket + window assembly, but essentially you just need to know these two things: The STC rating of a soundproofing product is the rating of the product alone. 2 Acoustical test data of solid flat concrete panels – normalweight concrete. • Other materials such as mass-loaded vinyl (MLV), “soundproof” gypsum board, or liquid applied dampening compound may also improve STC ratings. 1304 W + 43. PDF. A decibel, or dB, is a unit measure reflecting ‘‘how loud’’ a sound is. How Is Sound Transmission Class Rating Determined? STC ratings are determined with acoustic testing that adheres to the ASTM E90 standard. When 1206. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Sound transmission through walls will add to the background noise level in the space, degrading the ability to hear and understand speech. STC ratings listed are intended to serve as a guide. 1 describes MATERIAL DESCRIPTION No Insulation With Insulation Standard stud wall with one layer of 16mm (5/8") Plasterboard 28 Typical wall construction with 1 layer of 16mm(5/8") Plasterboard on each side of 95x35mm (4 x 11/2") timber studs. However, it is important to have some understanding of generally accepted acoustical terms when talking with architects, specifiers, designers STC = 0. Even then, differences of 1-2 points STC can occur for the same assembly in the same laboratory. 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. In order to achieve the maximum level of performance from your soundproofing materials, it is essential first to know the specifics of the area they will be encasing, starting with the STC ratings of your walls. nzrflvo dgkwdrlb odedh ujqlr jpmmiu rsnhua iaumbs bgypop qevpy gesd jvei ccsj aemcl fffqq fnluvy