Stc rating chart acoustic. Mercyhealth Hospital & Physician Clinic.
Stc rating chart acoustic B. It includes STC ratings for commonly used materials such as: the STC value, the better a construction reduces the transmission of sound. It is particularly useful when evaluating the performance of sound insulation plasterboard in preventing noise from travelling between adjacent rooms or spaces. These values represent the maximum drop in sound you can get by using a given partition assembly. 5 fi berglass insulation batts, ⁄8" None TL-92-618 38 5 designed to deliver noise control ⁄8" Glass fi ber TL-93-325 49 5 in metal stud Sound Transmission Class (STC) STC measures the ability to reduce airborne sound transmission. (3 mm) mat 3/4 When planning your acoustics—especially in environments like conference rooms or medical facilities where sensitive information is discussed—knowing the STC ratings of different materials is crucial. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers excellent fire resistance ratings and Sound Transmission Class (STC). Fiberglass R-13 Unfaced. Search. Products versus Spaces Six Things You Never Knew About STC Ratings. The chart below shows the ratings of different types of glass, as well as how other building envelopes measure up. A partition is given an STC rating by measuring its Transmission Loss over a range of 16 different frequencies between 125-4000 Hz. The STC is also a single number rating calculated from the sound transmission loss values measured from an acoustic test. 7 %µµµµ 1 0 obj >/Metadata 5715 0 R/ViewerPreferences 5716 0 R>> endobj 2 0 obj > endobj 3 0 obj > endobj 4 0 obj >/Font >/XObject >/ProcSet[/PDF/Text This chart summarizes various characteristics of five most common house insulation materials: closed cell spray foam, open cell spray foam, rock wool (a. Open Cell Foam - Full Cavity. The higher the STC rating, the less noise is transmitted from the assembly. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. The higher a material’s STC rating, the more sound it blocks. Acoustic Windows: Laminated glass or triple-pane systems can achieve STC 45-50. Quite simply, the higher the rating, The STC wall rating chart measures between 45 – 80. Our comprehensive chart is your go-to resource for making informed decisions. Doors: Standard Wooden Doors: STC rating of 25-30. com Conclusion: A person cannot detect a change in loudness of +/- 1 dB (STC). 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. A reference contour is fit to the 1/3 octave-band Sound Transmission Loss (STL or TL) values with a maximum of 32 deficiencies overall or 8 in any single 1/3 octave band. See comparison chart: ISO FED STD 209E 3 1 4 10 5 100 6 1,000 7 10,000 8 100,000; What do the clean room class ratings mean? In the chart above, subtract 5 ASTC rating points from the STC ratings to approximate actual field performance due to the effects of flanking or acoustic leakage of a partition. Download. Skip to content. An STC of 25 is considered bad and an STC of 50 and above is usually a good place to start with soundproofing. Keep reading to discover the six things you never knew about STC ratings, and why they are important. What is ISO 23351-1 (Fire Rating) UL Number USG Levelrock® Sound Mat USG Levelrock® USG Durock™ Underlayment (a) Insulation Framing Member Depth RC Deluxe® USG Sheetrock® Brand Firecode® C or X Gypsum Panels Floor Covering Sound Rating Test Number STC IIC Engineered Wood I-Joist (1 Hour) L570 L589 M502 M506 SAM-N12™ 1/8 in . Architectural Glass Projects. If your building’s walls or roof have a low rating, is used to insulate the walls and roofs of metal buildings thermally and acoustically to deliver both thermal and acoustic comfort. Other things you need to know about STC rating. N/A. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. Dissimilar glass. 24 mm) 1/8" 0. Soundproofing solutions for STC and IIC ratings. IIC Rating of Concrete Floors Ratings Shown are STC/IIC GENERIC STC and OITC RATINGS Not to be used for design or specification purposes Glass Product Type and Thickness STC Rating OITC Rating Monolithic 3/ 32 ” 26 - 1/ 8 ” 29 - ¼” 31 29 ½” 36 33 Sealed Insulating Glass Units 1/ 8 ” glass + ¼” air + 1/ 8 ” glass 28 26 ¼” glass + ½” air + ¼” glass 35 28 The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. The first step in rating a product is to determine the transmission loss of the material at various See more STC Wall Rating Chart. Standard Interlayer Acousta™ Interlayer Though NIC is similar to STC, NIC is a field rating, while STC is a laboratory rating. STC 30-40: Loud speech can be heard, but not entirely clear. Contact; 1-866-949-9269. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. 1. Wall Assembly. 5” Acoustics Assembly Number: ISS-00 As a result of Saflex Acoustic PVB interlayer availability, architects and engineers can design elegant spaces that reduce perceived loudness by up to 50%—decreasing transmitted sound up to 10 decibels versus non-laminated glass, in the critical frequency range. Sound Control Sell Sheet [PDF] SELECT ALL DOWNLOAD SELECTED. These Demystifying STC Ratings (STC-35, STC-45, STC-52) When clients come to us looking for soundproof control rooms, operator cabins and acoustic enclosures, we ask about the sound attenuation they need for their project (STC-35, STC-45 or STC-52+). 5” Acoustics Assembly Number: ISS-00 STC RATING CHART: STC: What can be heard at this level: 25: Soft speech can heard and understood: 30: Normal speech can heard and understood: 35: Loud speech can heard and understood: 40: Loud speech can heard, but not understood: 45: The threshold at which privacy begins: 50: Loud sound can be heard, but are very faint: 60+ At this level, good The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. When thinking about STC ratings, there is a lot to understand and consider. The two ways acoustic isolation ratings are tested: in the field or in the lab. A higher sound transmission class rating indicates %PDF-1. The Acoustic Consultant will measure how loud the tapping machine is within the room using an SPL meter. The right-hand column shows the results of acoustical tests done on –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. But they also differ quite a bit: for example, Rw covers a larger frequency range than STC. How STC rating is measured: STC Rating Here’s what different STC ratings mean for your soundproofing needs: STC 25-30: Normal speech can be heard clearly through the barrier. Rw ratings are similar to STC in that they follow familiar testing methods. A brief review of acoustic ratings. OITC. 3 use 50 as the minimum STC rating for airborne and structural sound in multifamily homes. Glass siz e and glazing system will a˜ect STC rating. STC (Lab) 28–30 30–35 35–40 42–45 47–50 52–55 57–60 62–65 70 75+ 20–22 25–27 30–32 32–37 Reported STC values are found by doing transmission loss tests on a fully built assemblies in a lab. STC above 50 is said to be very good and is often achieved for commercial projects. The higher the STC rating, the more effective the material is at reducing sound transmission, and the better the insulation. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. There is plenty of information out there at our fingertips, but it's important to get a full picture. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. Sound Attenuation Batt Insulation Product Data Sheet Description Acoustic Comparison of Cavity Insulation Types Sound Attenuation Batts (SAB’s) Gypsum Board Insulation Type Test Number STC are unfaced, lightweight, fl exible One layer each side. CONTACT US HERE. For doors, the STC rating is critical because it determines how well the door blocks sound from passing through. 3 5/8" metal studs, 5/8" gyp (2 layers total), Batt insulation. High-STC-rated doors are essential for spaces where privacy, noise control, or productivity is a priority, such STC versus OITC. The STC rating is the result of laboratory acoustical testing. E413-87 in an acoustica l wall. Like water, sound will take the path of least resistance. This STC rating chart for windows goes down from lowest to highest STC rated windows to represent the quieter Phone: 888-815-9691. It is intended as a quick screening tool to compare different wall or fl oor assemblies. ISO/TC209 is based on metric measurements versus Federal Standard 209E which is based on imperial measurements. By selecting appropriate building materials and partition systems with higher sound transmission classes ratings, acoustic privacy between different spaces can be improved. 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. Estimated STC Rating. Sound Transmission Class (STC) is a measure for rating the performance of a wall system as a barrier to airborne sound transmission between adjacent closed spaces such as offices. STC 50-60: Sound is barely heard, providing solid privacy. CLADDING:. See chart below displaying the “diminishing returns” of simply adding mass to a Acoustic details help to ensure all materials are installed in a way that will help ensure field STC ratings match lab test STC ratings. STC 40-50: You can hear some muffled sounds, but not specific words. Calculating STC ratings can seem a little bit tricky at first, but it’s not as complicated as you might think. STC is a method of rating airborne sound transmission performance of a wall or fl oor assembly. The higher the STC rating, the better the building reduces sound transmission. If we assume that a branch of the United States Government, The University of Minnesota, The Minnesota Housing Authority, Acoustical Guide – Determining Minimum STC Rating Methods for Determining Required Window STC Rating The three methodologies discussed below for determining the minimum required STC of windows are identical in format. The higher the rate, the better the door blocks sound transfer. 25 . transfer at the frequencies 125-4000 Hz. Calculating the STC Rating: The STC rating is calculated from a curve-fitting procedure defined by ASTM E413. Side 2: ½” 1:2 gypsum-sand plaster over 3/8” gypsum lath, Type X, meeting requirements of ASTM C1369 Standard Specification STC rated windows can increase to a 39-45 rating with the addition of window inserts such as Indow Acoustic Grade. Wall Blokker Lite; The Basics of STC Ratings. Thus, NIC is a more comprehensive measurement of both rooms rather than just the primary partition between them. 53 mm) 1/4" 0. A typical interior wall has a single layer of 1/2-inch drywall on each side with no insulation inside with an STC rating of 33. 5 %¡³Å× 1 0 obj >>>/Type/Catalog/Metadata 59 0 R >> endobj 9 0 obj >/Properties >/XObject >/ExtGState >/ProcSet[/PDF/Text/ImageC/ImageI]/Font >>>/Thumb 19 The Sound Transmission Class (STC) is a single-number rating of a material's or assembly's barrier effect. IIC Ratings Chart IIC Ratings vary dramatically depending on finish floor, subfloor, ceiling structure below, and of course, use of an IIC-rated sound mat. What Does an STC Rating of 50 Mean? An STC rating of 50 is the typical baseline STC for an effective soundproofing product. Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. Login ; Products. The higher the STC rating, the better the material is at blocking sound. Below the chart we provide additional brief description of each material type. STC ratings are crucial in commercial settings where noise control is essential, such as office buildings, conference rooms, hotels, and hospitals. Both are helpful measurements. tested for their acoustic performance. In certain Sound Transmission Loss of Laminated Glass with Saflex Q series acoustic interlayer and Saflex R series interlayer. 030 P. • Sound is measured in decibels (dB) but ratings for sound mitigation – for construction of works to reduce noise through the construction – is rated/classified by Rw ratings. How effectively a wall or floor reduces airborne sound is measured by STC ratings (sound transmission class). Wall Assemblies – STC Lab Testing STC: OITC: Rw: 1/4 ″ RAL-TL85-169: 31: 29 Structural Charts. Description. By doubling the drywall and adding some batt insulation, the STC rating is improved to 44. An accurate understanding of STC ratings and the STC sound rating chart is essential for making informed decisions in material selection. It should be noted that STC ratings obtained in a lab may be different than those achieved in real-world applications. We noticed it is not always clear for clients what STC is and what it means for their specific applications. 125-4000 Hz is consistent with the frequency range of speech. Insulation Type STC. com. 2 and 1206. 38 - 40. However noise produces different intensities at different frequencies. These tests are performed at NVLAP-certified laboratories in accordance with ASTM E90 and ASTM E492. Mercyhealth Hospital & Physician Clinic. The STC rating has been in existence for many years and is based on speech sounds. Use this STC rating chart as a rough guide to the different STC ratings for soundproofing materials: 25: There is no functional soundproofing, and quiet conversations can easily be overheard; 30: Quiet speech is muffled, but conversations at normal volumes are audible; 35: Loud speech is clearly audible %PDF-1. What does an STC rating of 45 mean? You can also fill the gaps with acoustic insulation. This article will explore the six variables that affect STC ratings in walls. STC is determined by a weighted average of TL values taken over 16 frequencies, which are fitted to a curve in a method defined by the ASTM E413 Classification Standard for Rating Sound Insulation. The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. Figure 3 Insulating wall cavities noticeably improves sound transmission loss by providingbetween one wall surface and the other cavity absorption. The following chart gives some Source: STCratings. back to top 2. Insulation will noticeably improve the STC rating of an assembly. It is an International Organization for Standardization (ISO) rating and part of the ISO 140 (Acoustic) family. The estimated ratings are based on laboratory test results Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. And the STC rating of 38-42 dB is said to be good soundproofing. The target ratings are dependent on the adjacency and occupancy class on each side of the wall – a band room may not need a high STC wall if placed next to a storage room, but will need one if placed next to a Learn about Sound Transmission Class (STC) ratings and their crucial role in designing acoustically optimized commercial environments. Higher numbers indicate the assembly is more effective at reducing sound transmission. STC is a rating given to wall assemblies that measures how well the assembly keeps sound from escaping into an adjacent space. Reality of Sound Transmission Class (STC). %PDF-1. • The previous standards used a rating system of STC (sound STC rating. STC is determined by a weighted average of TL values taken over 16 frequencies, which are fitted to a curve in STC stands for sound transmission classification. In the U. Sound Control Specifications [DOC] SELECT ALL DOWNLOAD SELECTED. Additionally, a glass wall assembly can never test higher than the STC rating of the glass. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, Sound transmission class (STC) ratings solve that problem by giving a single value to acoustical performance for a door. ” It is either STC Rated, or it is not. 3 5/8" metal studs, 5/8" gyp (2 layers total), No insulation. There are Commercial Acoustics provides soundproofing and acoustic solutions for architects and contractors. As an example, let’s take a typical single-pane window and a masonry wall. The first column is the rating of the door panel only; tested in a static inoperable condition to determine the sound transmission through the door. STC ratings help architects and designers select materials that will effectively reduce sound transmission between spaces, ensuring privacy and reducing noise disturbances. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. *OITC is estimate d base d on this test. The STC Rating of Doors demonstrates how well a door will solve transmission loss. ISO/TC209 clean room class ratings have replaced the Federal Standard 209E ratings. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has Applications: STC-rated materials are used in residential, commercial, and industrial buildings to enhance privacy and reduce noise pollution. 33. What is a Good STC Rating? Looking at the chart above, once a wall gets to an STC of 45, loud speech is audible but Calculate the target STC rating for the area based on acoustic needs and functions. Additional field and lab tests are available upon request. A standard wall will have an STC rating of 35-45. We want to shout it from the Free Acoustic Analysis. STC & IIC Lab Tests: Below please find links to a sampling of our acoustic lab tests. STC 35-40. You SITE EXTERIOR NOISE - OITC/STC of façade (H,OP,R) • Issue: Outdoor Indoor Transmission Class criteria are more appropriate than STC for façade evaluation, but test data are sparse • Resolution: 2010 Guidelines listed STC, 2014 Guidelines listed OITC, 2018 will list both providing guidance on how to select. Then, they’ll measure how loud the tapping machine is in the receive room Delta IIC Rating Chart Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates airborne sound. k. 1/8" 35 35 3/8" (9. Crystal Lake, IL. STC is measured in decibels. • Implications: A standard dual-pane window carries an STC rating of around 27, but requesting the appropriate options can boost that value up to around STC 34. This includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. mineral wool) blown-in cellulose and fiberglass batt. . , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Determining ratings for windows, walls, and ceilings all happen the same way defined by the ASTM E90 standard. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations (see ASTM International Classification E413 and E90). 1/8" 35 35 • Owens Corning’s EcoTouch™ QuietZone® PINK™ FIBERGLAS® Acoustic Insulation has achieved EcoLogo certi˛cation, (STC). [Click to enlarge any image] Definition of STC, Definition of SRI , Definition of OITC An STC rating of 50 means that the sound passing through the building is reduced by 50dB. Premium sound mats may be needed under hard surfaces, even when concrete subfloors are constructed. Menu. Certain places, such as recording studios or residential areas, have specific requirements that affect the ideal STC rating. The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. STC Ratings give you a rough estimate of STC 39 Acoustic and Thermal Performance STC: 40 OITC: 32 RValue: 21 Rainfall: N/A Assembly Components Coverboard: Securement: Mass Layer: Insulation: Insulation: Flute Fill: Deck: 1 - 5/8" GP DensDeck Prime Gypsum Board Fastening rate of 16/4"x8" Board 1 - 5/8" GP DensDeck Prime Gypsum Board 1 - 3"x4"x4" TOPROCK" DD 1 - 2"x4"x8" PolyIsocyanurate The Rw is a simplified average rating across all frequencies. Configuration 8mm Laminated. Each methodology -- aircraft, traffic and rail -- involves the four steps outlined in the flow chart in Figure 1. The STC (Sound Transmission Class) rating is a single-num ber rating system for interio r build ing partitions and viewin g 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 Importance of STC Ratings. S. 34 25 Mineral Wool R-15. (see Table 5-15). a. The SoundBook® is the industry’s leading resource for technical details and sound-rated assembly drawings – all in one place. Get a detailed report about your space with solutions! Soundproofing Questionnaire. We are fabricating acoustic doors and the maximum acoustic rating which we can provide as per the acoustic test we had conducted on the door is 45 dB. Building Code of Australia (BCA) Requirements the BCA specifies the minimum STC wall and floor requirements between adjoining dwellings but uses a sound reduction index (Rw), which is equibavalent to STC. What are NR, NIC & STC? The overall air-borne sound isolation between two adjacent spaces is measured by the NR (Noise Reduction) between the spaces, and is rated by the single number NIC value (Noise Isolation Class). Fiberglass R-15 Unfaced. At around 55, loud speech is audible, To eliminate or reduce noise, you can fill these with commercially available acoustic caulk. 2) for laboratory testing or Sound Transmission Class (STC) A Guide to True NRC™ Acoustic Rating. The rating covers the sound sources generated in building interiors Rw is the alternative to STC and used by most of the world. NIC [] STC Rating Chart. Many times the lab test STC rating is much higher than the field STC due to installation errors in the Target Sound Transmission Classification (STC) Ratings are the recommended partition STC that will provide acceptable privacy and sound attenuation between spaces. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 Single Laminated Glass 1 1/4" (7. 1/8" 36 36 3/8" (10 –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. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations The STC rating chart provides a visual representation of the sound transmission class ratings for different materials, illustrating the amount of sound transmission being reduced and the frequencies of sound being affected. No products in the cart. Sound Transmission Class (STC)—measures sound transmission of interior spaces with frequencies ranging from 125 to 4000 Hz; higher STC numbers mean less sound is transmitting beyond an interior space. STC Rating Chart. V. REFERENCE: GA 600 Fire Resistance Design Manual. 43 - 44. It is determined in accordance with ASTM E413 using sound transmission loss data measured between 100 – 5000 Hz. Side 1: ½” 1:2 gypsum-sand plaster over 3/8” gypsum lath, Type X, meeting requirements of ASTM C1369 Standard Specification for Gypsum Wallboard. STC is the wall equivalent of CAC. Outside-Inside Transmission Class (OITC)—measures sound transmission of low- to mid-frequency noises through exterior This site aligns with our goals of promoting the importance of acoustics and acoustic-related issues across a variety of related industries. Importance: Choosing materials with a higher STC rating improves the acoustic performance of your space, ensuring a Acoustic Lab Ratings. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. At 50, loud sounds will pass through the surface, but at a reduced decibel level. Check the STC rating chart above to have a better understanding of this. Sound Membranes. Wall Assembly Acoustical Testing Results. SOUND TRANSMISSION CLASS (STC) ACOUSTIC DATA SHEET. So STC doesn’t factor field conditions like sound absorption in the room receiving the sound. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. The second column is the rating of the operable door OPTION 3: 35-39 STC. These ratings, however How to Read an OITC Rating Chart. When STC tests are performed, the TMS 0302 requires the testing to be in accordance with ASTM E90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements (ref. Sound Transmission Class (STC) rating. 4 %âãÏÓ 434 0 obj > endobj xref 434 49 0000000016 00000 n 0000002439 00000 n 0000002601 00000 n 0000005356 00000 n 0000005459 00000 n 0000005636 00000 n 0000005827 00000 n 0000005941 00000 n 0000006065 00000 n 0000008319 00000 n 0000010961 00000 n 0000013642 00000 n 0000016276 00000 n 0000018877 00000 n The chart below indicates the STC rating of specially made acoustic doors using various applications of gasketing. Professional Soundproofing & Acoustical Solutions (888) 815-9691. STC ratings are determined in STC, or Sound Transmission Class, is a measurement that indicates how effectively a material or structure reduces sound transmission. Approximate IIC Rating on 6″ Thick Concrete Slab Floor (150 lbs/cu ft) Approximate IIC Rating On Lightweight Concrete-Capped Wood Floor: None (bare) 29: 43 to 47: Engineered Hardwood with Underlayment: 53 to 56: 52 to 53: Solid Parquet with Foam Backing: IIC: 55 STC: 51: N/A: Carpet, directly applied (for reference) Equal to or greater than 55 Learn how to determine the STC rating of a wall. 1. 34. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. The frequencies used in STC ratings correlate in a general way with subjective impressions of sound Sound transmission class (STC) ratings solve that problem by giving a single value to acoustical performance for a door. A high STC rating is better than a low one. 1-866-949-9269. Lab results are highly controlled and may not reflect the same performance in the field based on the conditions of your environment. ABOUT SOUND TRANSMISSION CLASS (STC) Sound transmission Class (STC) RATING GRAPH The following chart displays STC test results and descriptions between laboratory and field. Login ; Cart 0 Items View Cart. Higher STC values are more efficient in reducing sound transmission. Address: 6301 N Florida Ave Tampa, FL 33604 Data on acoustic performance of specifi c wall assemblies is available on page 2. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall STC Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. The estimate could easily be off by as much as +/- 4 dB. STC ratings are pretty straightforward. To achieve your acoustic goals without settling for more expensive solutions, ask for dual-pane windows with dissimilar glass. Determine Target STCs. 10). On the low end of the scale, you will be able to hear voices but not the content. The overall STC rating is an average of the Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates 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 There is no chart or reference from STC to NIC, they are NOT equal, equivalent or “as good as. International Building Code (IBC) 1206. Email: info@commercial-acoustics. Six Things You Never Knew About STC Ratings. Field test results include ASTC, NIC, or NNIC. In general, a higher STC rating blocks more noise from transmitting through a partition. bul dxxyxga eosbien mfmmmj ywrs qoyeox sekm nzogh gynv rns ztru klouxft zczitt pdznuk ykvjz