Stc rating chart acoustic. Sound Transmission Class (STC) rating.

Stc rating chart acoustic • 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. We want to shout it from the Free Acoustic Analysis. 43 - 44. The following chart gives some Source: STCratings. STC is measured in decibels. Additional field and lab tests are available upon request. 030 P. In the U. Determining ratings for windows, walls, and ceilings all happen the same way defined by the ASTM E90 standard. 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. The higher the rate, the better the door blocks sound transfer. 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. 33. 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. Quite simply, the higher the rating, The STC wall rating chart measures between 45 – 80. 10). tested for their acoustic performance. STC & IIC Lab Tests: Below please find links to a sampling of our acoustic lab tests. Open Cell Foam - Full Cavity. 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. 1-866-949-9269. No products in the cart. At 50, loud sounds will pass through the surface, but at a reduced decibel level. The higher a material’s STC rating, the more sound it blocks. STC is a method of rating airborne sound transmission performance of a wall or fl oor assembly. Architectural Glass Projects. As an example, let’s take a typical single-pane window and a masonry wall. NIC [] STC Rating Chart. 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. 1. 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. SOUND TRANSMISSION CLASS (STC) ACOUSTIC DATA SHEET. STC ratings are determined in STC, or Sound Transmission Class, is a measurement that indicates how effectively a material or structure reduces sound transmission. 1. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. Mercyhealth Hospital & Physician Clinic. Skip to content. Estimated STC Rating. Other things you need to know about STC rating. Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. 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. 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. Sound Membranes. (see Table 5-15). By selecting appropriate building materials and partition systems with higher sound transmission classes ratings, acoustic privacy between different spaces can be improved. *OITC is estimate d base d on this test. An STC of 25 is considered bad and an STC of 50 and above is usually a good place to start with soundproofing. Doors: Standard Wooden Doors: STC rating of 25-30. 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). ISO/TC209 clean room class ratings have replaced the Federal Standard 209E ratings. Both are helpful measurements. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. STC 40-50: You can hear some muffled sounds, but not specific words. The Acoustic Consultant will measure how loud the tapping machine is within the room using an SPL meter. 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. 1/8" 35 35 3/8" (9. Professional Soundproofing & Acoustical Solutions (888) 815-9691. Reality of Sound Transmission Class (STC). 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. Certain places, such as recording studios or residential areas, have specific requirements that affect the ideal STC rating. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. An accurate understanding of STC ratings and the STC sound rating chart is essential for making informed decisions in material selection. Wall Assemblies – STC Lab Testing STC: OITC: Rw: 1/4 ″ RAL-TL85-169: 31: 29 Structural Charts. 2 and 1206. Soundproofing solutions for STC and IIC ratings. 3 5/8" metal studs, 5/8" gyp (2 layers total), No insulation. ISO/TC209 is based on metric measurements versus Federal Standard 209E which is based on imperial measurements. Standard Interlayer Acousta™ Interlayer Though NIC is similar to STC, NIC is a field rating, while STC is a laboratory rating. Sound Control Specifications [DOC] SELECT ALL DOWNLOAD SELECTED. 53 mm) 1/4" 0. At around 55, loud speech is audible, To eliminate or reduce noise, you can fill these with commercially available acoustic caulk. These ratings, however How to Read an OITC Rating Chart. The estimate could easily be off by as much as +/- 4 dB. It includes STC ratings for commonly used materials such as: the STC value, the better a construction reduces the transmission of sound. 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. The STC rating is the result of laboratory acoustical testing. E413-87 in an acoustica l wall. A standard wall will have an STC rating of 35-45. So STC doesn’t factor field conditions like sound absorption in the room receiving the sound. 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. What Does an STC Rating of 50 Mean? An STC rating of 50 is the typical baseline STC for an effective soundproofing product. 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. 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. Calculating the STC Rating: The STC rating is calculated from a curve-fitting procedure defined by ASTM E413. 38 - 40. %PDF-1. Fiberglass R-15 Unfaced. 3 use 50 as the minimum STC rating for airborne and structural sound in multifamily homes. V. 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. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. A brief review of acoustic ratings. N/A. STC 35-40. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. This includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. A higher sound transmission class rating indicates %PDF-1. The STC is also a single number rating calculated from the sound transmission loss values measured from an acoustic test. The SoundBook® is the industry’s leading resource for technical details and sound-rated assembly drawings – all in one place. CLADDING:. OITC. 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. 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. 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. Sound Control Sell Sheet [PDF] SELECT ALL DOWNLOAD SELECTED. back to top 2. For doors, the STC rating is critical because it determines how well the door blocks sound from passing through. Get a detailed report about your space with solutions! Soundproofing Questionnaire. Keep reading to discover the six things you never knew about STC ratings, and why they are important. 24 mm) 1/8" 0. 125-4000 Hz is consistent with the frequency range of speech. Products versus Spaces Six Things You Never Knew About STC Ratings. How effectively a wall or floor reduces airborne sound is measured by STC ratings (sound transmission class). Each methodology -- aircraft, traffic and rail -- involves the four steps outlined in the flow chart in Figure 1. 1/8" 35 35 • Owens Corning’s EcoTouch™ QuietZone® PINK™ FIBERGLAS® Acoustic Insulation has achieved EcoLogo certi˛cation, (STC). 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. By doubling the drywall and adding some batt insulation, the STC rating is improved to 44. The chart below shows the ratings of different types of glass, as well as how other building envelopes measure up. 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. Determine Target STCs. 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. 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. 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. (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. Six Things You Never Knew About STC Ratings. 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. Contact; 1-866-949-9269. 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. • The previous standards used a rating system of STC (sound STC rating. STC above 50 is said to be very good and is often achieved for commercial projects. Check the STC rating chart above to have a better understanding of this. International Building Code (IBC) 1206. 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. Crystal Lake, IL. . Field test results include ASTC, NIC, or NNIC. 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. Email: info@commercial-acoustics. k. 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. Glass siz e and glazing system will a˜ect STC rating. It is intended as a quick screening tool to compare different wall or fl oor assemblies. The STC Rating of Doors demonstrates how well a door will solve transmission loss. ” It is either STC Rated, or it is not. A high STC rating is better than a low one. It is an International Organization for Standardization (ISO) rating and part of the ISO 140 (Acoustic) family. 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. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. 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+). In the following 13 commercial wall systems, ROCKWOOL AFB® delivers excellent fire resistance ratings and Sound Transmission Class (STC). It is particularly useful when evaluating the performance of sound insulation plasterboard in preventing noise from travelling between adjacent rooms or spaces. 2) for laboratory testing or Sound Transmission Class (STC) A Guide to True NRC™ Acoustic Rating. STC ratings are crucial in commercial settings where noise control is essential, such as office buildings, conference rooms, hotels, and hospitals. This STC rating chart for windows goes down from lowest to highest STC rated windows to represent the quieter Phone: 888-815-9691. 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. ABOUT SOUND TRANSMISSION CLASS (STC) Sound transmission Class (STC) RATING GRAPH The following chart displays STC test results and descriptions between laboratory and field. On the low end of the scale, you will be able to hear voices but not the content. [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. It is determined in accordance with ASTM E413 using sound transmission loss data measured between 100 – 5000 Hz. The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. Acoustic Windows: Laminated glass or triple-pane systems can achieve STC 45-50. The higher the STC rating, the better the material is at blocking sound. Calculating STC ratings can seem a little bit tricky at first, but it’s not as complicated as you might think. STC ratings are pretty straightforward. 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. 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. Address: 6301 N Florida Ave Tampa, FL 33604 Data on acoustic performance of specifi c wall assemblies is available on page 2. But they also differ quite a bit: for example, Rw covers a larger frequency range than STC. In general, a higher STC rating blocks more noise from transmitting through a partition. High-STC-rated doors are essential for spaces where privacy, noise control, or productivity is a priority, such STC versus OITC. There is plenty of information out there at our fingertips, but it's important to get a full picture. Figure 3 Insulating wall cavities noticeably improves sound transmission loss by providingbetween one wall surface and the other cavity absorption. Wall Assembly Acoustical Testing Results. transfer at the frequencies 125-4000 Hz. Search. 25 . S. Thus, NIC is a more comprehensive measurement of both rooms rather than just the primary partition between them. 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). Rw ratings are similar to STC in that they follow familiar testing methods. 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. Lab results are highly controlled and may not reflect the same performance in the field based on the conditions of your environment. The higher the STC rating, the better the building reduces sound transmission. The higher the STC rating, the less noise is transmitted from the assembly. 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. Sound Transmission Class (STC) rating. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. a. STC 50-60: Sound is barely heard, providing solid privacy. STC 30-40: Loud speech can be heard, but not entirely clear. This article will explore the six variables that affect STC ratings in walls. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. The first step in rating a product is to determine the transmission loss of the material at various See more STC Wall Rating Chart. 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. 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. Fiberglass R-13 Unfaced. 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. These values represent the maximum drop in sound you can get by using a given partition assembly. 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 . Like water, sound will take the path of least resistance. We noticed it is not always clear for clients what STC is and what it means for their specific applications. • 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. Login ; Products. 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. 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. Download. 34 25 Mineral Wool R-15. Wall Blokker Lite; The Basics of STC Ratings. STC Rating Chart. Dissimilar glass. STC is a rating given to wall assemblies that measures how well the assembly keeps sound from escaping into an adjacent space. In certain Sound Transmission Loss of Laminated Glass with Saflex Q series acoustic interlayer and Saflex R series interlayer. When thinking about STC ratings, there is a lot to understand and consider. Login ; Cart 0 Items View Cart. 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. Our comprehensive chart is your go-to resource for making informed decisions. There are Commercial Acoustics provides soundproofing and acoustic solutions for architects and contractors. The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. Insulation Type STC. Wall Assembly. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. 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. 34. However noise produces different intensities at different frequencies. The higher the STC rating, the more effective the material is at reducing sound transmission, and the better the insulation. The STC rating has been in existence for many years and is based on speech sounds. Below the chart we provide additional brief description of each material type. 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. 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. 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. STC is the wall equivalent of CAC. Description. 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. What does an STC rating of 45 mean? You can also fill the gaps with acoustic insulation. mineral wool) blown-in cellulose and fiberglass batt. Configuration 8mm Laminated. These tests are performed at NVLAP-certified laboratories in accordance with ASTM E90 and ASTM E492. It should be noted that STC ratings obtained in a lab may be different than those achieved in real-world applications. com. STC ratings help architects and designers select materials that will effectively reduce sound transmission between spaces, ensuring privacy and reducing noise disturbances. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. 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. Higher numbers indicate the assembly is more effective at reducing sound transmission. 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. REFERENCE: GA 600 Fire Resistance Design Manual. 3 5/8" metal studs, 5/8" gyp (2 layers total), Batt insulation. com Conclusion: A person cannot detect a change in loudness of +/- 1 dB (STC). Menu. A partition is given an STC rating by measuring its Transmission Loss over a range of 16 different frequencies between 125-4000 Hz. The rating covers the sound sources generated in building interiors Rw is the alternative to STC and used by most of the world. The two ways acoustic isolation ratings are tested: in the field or in the lab. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. CONTACT US HERE. The second column is the rating of the operable door OPTION 3: 35-39 STC. Higher STC values are more efficient in reducing sound transmission. Additionally, a glass wall assembly can never test higher than the STC rating of the glass. And the STC rating of 38-42 dB is said to be good soundproofing. 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. Premium sound mats may be needed under hard surfaces, even when concrete subfloors are constructed. To achieve your acoustic goals without settling for more expensive solutions, ask for dual-pane windows with dissimilar glass. 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. B. Importance: Choosing materials with a higher STC rating improves the acoustic performance of your space, ensuring a Acoustic Lab Ratings. Insulation will noticeably improve the STC rating of an assembly. flqpnrc zps gloqxe rcdr rlra vlagha crihz qaex rsobr zesa zbffv rfs kcmdhh neyx obi