Stc ratings of materials pdf. Add a second layer of gypsum board to each side.
- Stc ratings of materials pdf 15/8" (41 mm) Steel Studs *Indicates value is an estimate Steel Framing STC Values Sound Control JM Formaldehyde-free insulations help reduce 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. Recommended STC ratings are 50 for UBC code compliance and 60 for sensitive areas, though awareness of loud often quite inaccurate in comparing an assembly of materials having widely differing TL-frequency characteristics. 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. Within a dwelling an internal wall with a STC rating of 45 will usually "muffle" television, telephone ringing and conversation in an adjoining room. 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: To determine the STC ratings for windows, walls and ceilings you can do it the same way as defined by the ASTM E90 standard. J2247-13-303-11-R0 Insulation Included This document provides sound transmission class (STC) ratings for various glass and wall constructions. The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. Class (STC) rating. Flanking sound patterns, the integrity of the wall, and floor and ceiling construction are important factors in effective sound control. • The table at right lists common building materials and their STC and IIC values Product Description STC IIC Basic wood floor consisting of wood joist(I-joist, solid- STC ratings listed are intended to serve as a guide. Here’s an example. See data from the National Research Council of Canada. com. The STC ratings are applicable for both partitions and floor/ceiling assemblies. To determine the specific STC ratings of glass and a. The frequencies used in STC ratings correlate in a general way with subjective impressions of sound includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Of course, the higher the STC rating, the better. To achieve this rating and reduce noise transmission between rooms: Add R-11 fiberglass insulation in the cavity between the gypsum board layers. STC 42: Loud speech now is audible as a murmur. As an example, let’s take a typical single-pane window and a masonry wall. When plotted in this way, the STC rating falls nearly linearly with in Architects and contractors design and build assemblies that reduce sound transmission between spaces in commercial and multifamily buildings. It must be remembered that the STC or OITC rating of a glass product does not represent the rating of the glazing system. Wall Assembly Acoustical Testing Results. 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. Alternatively, acousti- resilie t channel, and batt insulation in the cavity. † Superior sound damping, cost-efficient material that is easily finished and decorated in the same manner as standard gypsum board. Visit our website atwww. • Metal framed walls have a higher STC rating than 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. In the absence of test data, standard calculation methods exist, which tend to be conservative. As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. That is not the case when using InsulGreen A batts. Drywall between double studs can dramatically reduce the STC rating of an assembly. 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. STC (Sound Transmission Coef˛cient) acoustical performance than nominal equivalent thickness, approximately 265% higher density mineral ˛bre (rock/slag wool) batts. Products Applications Nov 27, 2019 · It’s important to understand how the rating system works and know the plan for the anticipated rating of the project. 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. Download the Acoustics Overview and sound assemblies to learn more. The right-hand column shows the results of acoustical tests done on Comprehensive guide on acoustical assemblies and STC ratings for insulation systems, commercial roofing, and engineered products. Caution: You cannot add STC ratings. A Higher STC Rating will degrade the ability to hear and understand speech. 5. –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. Address: 6301 N Florida Ave Tampa, FL 33604 transmission, an OITC rating is designed to account for sound transmission from typical outdoor sounds which consists of frequencies lower than an STC rating. This rating is based on the requirements that the value of transmission loss at any of the eleven measuring STC Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. You might get something around STC 35. STC Rating Chart. • Metal studs perform better than wood studs by about 5db. A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. Construction practices have an influence on final STC ratings. STC ratings of individual partition components cannot be added together to arrive at an assembly STC rating. 6. However, it is important to have some understanding of generally accepted acoustical terms when talking with architects, specifiers, designers about 125Hz to 4Khz) and fit to a curve. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. 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. Typically a two (2) or more point change Achieving an STC 50 with simple 2X4 wall construction is rare. 1206 of the IBC requires minimum STC and IIC ratings of 50 if laboratory tested or 45 if field tested. TABLE 5 – SOUND ISOLATION DESIGN GOALS (STC) a wall, floor or roof. Fiberglass partitions with high rated STC values that are thinner than traditionally built high rated STC wall partitions providing increased usable floor space. 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 take this into account for higher STC ratings. 1206. 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 Phone: 888-815-9691. • It is worthwhile to compare the calculated values of an assembly to a similar assembly that has established test data. CAC 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. The system includes many materials other than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer The amount of airborne sound blocked from transmitting through a partition is measured in a sound transmission class (STC) rating. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. • Doubling the mass of a wall assembly does not double the STC rating. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. ” “With the cavity half-˛lled with absorptive material, the sound construction team and the design team to take this into account for higher STC ratings. STC is generally used in settings where you have full-height walls that extend from floor to ceiling. • Staggering the studs or using dual studs can (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. STC Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. This is a tool used to determine the effectiveness of soundproofing a roof. This avoids down-rating test results because of noise levels that are least objectionable to people. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. 0 International licence, with the exception of 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. Understanding STC ratings for drywall can be complex. A partition's STC can be increased by adding mass, increasing air space, or adding absorptive material. to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. STC 25: Normal speech can be understood easily through a wall. “These single-number ratings correlate in a general way with subjective impressions of sound Jan 20, 2021 · IIC ratings up to 59 db and STC ratings up to 58 db. Even then, differences of 1-2 points STC can occur for the same assembly in the same laboratory. simple 2X4 wall containing InsulGreen batts achieves an STC 50, as tested Jan 20, 2022 · Choosing the right noise and reverberation materials for your home, apartment or business is a science. It’s like the cousin of CAC but focuses on walls instead of ceilings. Jul 4, 2024 · STC is another critical metric that quantifies how well a wall or other vertical partition blocks sound. The U. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. A decibel, or dB, is a unit measure reflecting ‘‘how loud’’ a sound is. Flat Panel, STC-55 Frequency, HZ 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. As a general rule the higher the STC rating, the better the partition’s acoustical performance. 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. An STC rating is given in terms of points, and the data are given in terms of decibels. 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. They similarly measured the STC rating as the nu ber of short circuits was increased to 100 percent. Higher numerical values indicate better sound isolation. A STC rating of 55 is required for inter-tenancy walls. 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 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 . The higher the number, the better the sound is blocked and the less sound that is transferred through the partition. Mass Timber Panel Thickness STC Rating IIC Rating Jan 1, 2020 · Although STC is derived from sound transmission decibel loss, STC is a rating (with no decibel units). 1. 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. STC rating determined in accordance with ASTM E 413. 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 Mar 23, 2017 · determine more exact STC and IIC values. S. 27 — Standard method for evaluating ceramic floor tile installation systems Passes cycles 1-6 C627 Light commercial Light Light performance, the selection of a floor/ceiling system attaining a minimum 60 STC and IIC is recommended. The STC value is derived by fitting the plotted TL data to a reference contour defined by the ASTM E413 Classification Standard . † All SoundBreak XP Gypsum Board designs were tested and the resulting STC—heavier concrete masonry walls have higher STC ratings. STC is highly dependant on the construction of the partition. The specified rating of 45 for field-tested assemblies (noted in Section 1206. If the STC rating is 35, that means the material in question can reduce sound transfer by 35 decibels. The test measures the airborne sound attenuating characteristics of partitions, floors Materials Calculator Product Sustainability Project Profiles 1-800-NATIONAL PDF. 49/1. ) Note that these code requirements only apply to multi-family construction. Transmission Class (STC) rating of a wall separating two adjacent classrooms is 50. (3) “The greater the fraction of the cavity ˛lled with absorption, the higher the sound transmission loss. This is usu- ally because there is a pronounced dip in the test curve and the STC rating is heavily influenced by a measurement in one fre- quency band. resist the transmission of sound. OITC ratings determined in accordance with ASTM E 1332. 2 Acoustical test data of solid flat concrete panels – normalweight concrete. 39/1. One single number rating method which has been recently proposed is the sound transmission class (STC). 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. PDF. 12 of the LABC. 111). The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound STC is a rating of a material's ability to resist airborne sound transfer between 125-4000Hz, with higher ratings blocking more noise. Recommended STC Ratings on Corridor & Demising Walls. Figure 1 shows measured STC ratings for single-leaf concrete block walls from a number of published sources. They are logarithmic values and cannot simply be added. What Is an STC Rating? The STC If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. STC ratings are determined by laboratory tests of a and floors. In the fi eld, fl anking noise, quality of material and construction practices can lead to widely varied STC’s for the same assembly. Dec 7, 2023 · In simpler terms, the STC rating offers an indication of how soundproof a wall or floor/ceiling structure may be. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. 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 'field-STC' (FSTC) is usually lower than the laboratory-measured STC. An STC rating is a number given to different partitions to rate how well they stop airborne sound. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall 50. STC 30: Loud speech can be understood fairly well. The higher the rating the greater the degree of noise reduction. The right-hand column shows the results of acoustical tests done on It contains STC (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. The material in this publication is licensed under a Creative Commons Attribution-4. 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. In general, it is believed that a higher STC rating is preferable. Adding additional layers of drywall can improve the STC rating of an assembly. Insulation will noticeably improve the STC rating of an assembly. OITC. 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. May 19, 2023 · This article will explore the six variables that affect STC ratings in walls. Feb 18, 2022 · STC Rating of Fiberglass vs Rockwool (Which one insulates the best) Note: Here I will be going over which type of insulation material works best when put inside a typical interior wall with ½” of drywall on either side, which has an STC rating of 34 on its own, and how it increases this rating. The consid Phone: 888-815-9691. It’s an integer rating that tells us to what degree a building partition (such as a wall or ceiling) reduces the force of airborne sound. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. 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. The recommended STC ratings for the noise critical spaces, as reported in UFC 3-450-01 Table 5-1 and UFC 3-101-01 Table 2-1 through Table 2-2, are listed in Table 5. Sound can flank through paths other than walls. 10 of the LABC) is to be used for acceptance of individual jobs only. (These ratings can be reduced to 45 when field tested. Note that when trying to assess the total performance of a number of materials, STC points do not add up. STC 35: Loud speech audible but generally not intelligible. For example, MLV has an STC rating of around 27. Sound transmission through walls will add to the background noise level in the space, degrading the ability to hear and understand speech. The estimate could easily be off by as much as +/- 4 dB. Both materials are tested for acoustic performance and both meet or exceed building code requirements for partitions depending on the assembly. installed cost than other sound reduction Phone: 888-815-9691. 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. (Refer to manufacturer's specifications). significantly improve an IIC rating. Address: 6301 N Florida Ave Tampa, FL 33604 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. Address: 6301 N Florida Ave Tampa, FL 33604 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: To determine the STC ratings for windows, walls and ceilings you can do it the same way as defined by the ASTM E90 standard. SoundBook Gridstone Ceiling Attenuation Guide. *OITC is estimated based on this test. double stud wall) can yield an STC rating as high as 63 or more (See Technical Bulletin 20. 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. 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. 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. This value represents your STC rating. 8 in. [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 Nov 29, 2024 · Below is a list of STC ratings and common subjective results associated with them: Subjective Effectiveness of STC Ratings STC Sound Heard Through Wall or Floor 35 – 40 Most words and phrases clearly heard and understood 42 – 45 Medium loud speech audible, occasional words intelligible 47 – 50 Loud speech audible but not intelligible construction team and the design team to take this into account for higher STC ratings. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers excellent fire resistance ratings and Sound Transmission Class (STC). May 13, 2022 · The higher the STC rating, the less noise is transmitted from the assembly. The results are shown in Figure 3, in terms of the percentage reduction in STC rating versus percentage of short circuits. Email: info@commercial-acoustics. The most common single rating search for across the internet is STC 50. STC 45: You need to strain to hear loud speech at all. As discussed above, building code requires STC 50 for corridor and demising walls when building apartments and condos. The Maxxon floor underlayments and Acousti-Mat® are but single components of an effective sound control system. Of course, the rating is determined as an average based on the different frequencies between 125 Hz to 4000 Hz. The ASTM test procedure explains the use of STC in the following excerpt from E413. Standard Method for A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). Add a second layer of gypsum board to each side. Feb 19, 2024 · How is the STC Rating Determined? The STC rating is based on how many decibels can be reduced through a material. In the U. AccuQuiet® DX38 On wood frame construction AccuQuiet®DX38 can achieve IIC ratings up to 60 db and STC ratings up to 59 db. For additional information on sound test ratings please contact your local AccuCrete® Representative. Flat Panel, STC-55 Frequency, HZ May 13, 2022 · The higher the STC rating, the less noise is transmitted from the assembly. J2247-13-303-11-R0 Insulation Included 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. The first step in figuring out the STC ratings of materials is to determine the transmission loss of the material at various frequencies. Particularly, in the International Building Code, STC 50 is required for dwelling units to adjacencies. • Other materials such as mass-loaded vinyl (MLV), “soundproof” gypsum board, or liquid applied dampening compound may also improve STC ratings. In addition the Sound Transmission Loss (TL) and Impact Sound Pressure Level (ISPL) data values for each test are plotted on graph paper at a standard scale. For additional information on sound test ratings please specify the STC or OITC that is required of the glazing system. The standard requires a minimum laboratory STC rating of 50 for party walls and floor/ceilings. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. Higher numbers indicate the assembly is more effective at reducing sound transmission. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. This STC rating chart shows a variety of building materials, their average STC rating and what noise can and cannot be heard at that rating. Systems attaining ratings less than 55 STC and IIC provide only marginal acoustical performance. 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/ terms such as Sound Transmission Class (STC), Noise Criteria (NC), and Noise Reduction Coefficient (NRC). 1304 W + 43. 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. 27 0. In general, a higher STC rating blocks more noise from transmitting through a partition. Serious Materials cannot guarantee actual STC ratings. Insulation Type STC. That is because it is one of the few STC, or Sound Transmission Classification, ratings that are mandated by building code. The higher the STC rating, the better the partition performs in reducing sound transmission. 6 %âãÏÓ 606 0 obj > endobj xref 606 21 0000000016 00000 n 0000001523 00000 n 0000001608 00000 n 0000001742 00000 n 0000001970 00000 n 0000002582 00000 n 0000003199 00000 n 0000003236 00000 n 0000003436 00000 n 0000003622 00000 n 0000003700 00000 n 0000003776 00000 n 0000005949 00000 n 0000006014 00000 n 0000006091 00000 n 0000006166 00000 n 0000008859 00000 n 0000009774 00000 n Nov 7, 2016 · STC 50 Walls. Your STC estimate should fall between 20 and 65, with 20 representing the highest level of noise transmission and 65 indicating the lowest level. ES with EZ-SNAP Technology frequencies. transfer at the frequencies 125-4000 Hz. Glass size and glazing system will affect STC rating. 48 Statistical Tolerance ± 2. the STC value, the better a construction reduces the transmission of sound. How Is Sound Transmission Class Rating Determined? STC ratings are determined with acoustic testing that adheres to the ASTM E90 standard. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. 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. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 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. Seal all gaps between the walls and the floor and ceiling. However, it should be noted that these are three distinct terms for measuring different aspects of acoustics by voice, decibels (dB), and material sound absorption. 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: STC ratings are determined in a laboratory under controlled conditions. (STC) is the mass per unit area: the higher it is, the better. Dec 30, 2022 · For instance, if you recorded 16 different frequencies, divide your total by 16. STC is an attribute of a wall or floor-ceiling assembly that measures the STC ratings listed are intended to serve as a guide. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Resilient channel can improve the STC rating of an assembly. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. jm. Although guidelines related to acoustical performance in occupancies such as offices, schools and hospitals3 do exist, they are not requirements under the IBC. STC Ratings & Steel Stud Framed Walls . E413-87 in an acoustical wall. STC 48: Some loud speech is barely audible. Flat Panel, STC-58 6 in. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. The STC rating has been in existence for many years and is based on speech sounds. 35 38 Typical wall construction with 2 layers of 16mm(5/8") Plasterboard on each side of 95x35mm (4 x 11/2 WHAT IS STC? STC stands for Sound Transmission Class. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Increased wall thickness (such as additional layers of gypsum board) or additional materials (such as resilient channel) are typically needed to reach STC 50. STC = 0. In sum, STC tells you how much a ceiling or wall might stop sound. Specific products for these building materials will vary, so talk to the manufacturer to get the exact STC rating before purchasing. Understanding STC Ratings for Drywall. mcekp wrcfppqn cyunisy rgndksq lad uyvcm mkjjy hrfys ircxoh ssjlx duc mpp igwsl scrax swlbio