Best insulation stc rating chart. 3) for field testing.

Best insulation stc rating chart Uninsulated ductwork exhibits poor sound dampening and acoustic Jan 9, 2024 · Any openings in the barrier (doors, windows, MEP, etc) that have a lower STC rating than the barrier itself, will lower the overall rating of the barrier. Feb 25, 2022 · STC Rating of Fiberglass vs Cellulose (Which one soundproofs 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. Please see the reverse side for a comparison of how our cellulose and 4-inch Sound Control Batts perform in STC ratings by up to 10. com. (see Table 5-15). *OITC is estimated based on this test. Bedrooms should have a rating of 52, while bathrooms, kitchens and living rooms have a rating of 55. a. com or call 1-800-654-3103 | Building Insulation Division Bo | ener C Tecnical speciicaions as son in is lieraure are inended o be used as eneral uidelines only Te pysical and cemical properies o ermal. 2) for laboratory testing or ASTM E413, Standard Classification for Rating Sound Insulation (ref. An increase from 30 to 40 means 90% of the noise is reduced. Of course, the higher the STC rating, the better. 3) for field testing. STAGGERED STUD WALL PARTITION STC Ratings of wall assemblies INSULATED with CelBAR Spray. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. Glass siz e and glazing system will a˜ect STC rating. No adhesives or fasteners are required. Understanding STC ratings for drywall can be complex. at SOUND TRANSMISSION CLASS RATINGS. In fact, on the authority of the Insulation Institute, fiberglass insulation in interior walls and floors/ceilings can improve sound reduction. 34 25 Mineral Wool R-15. It has a 5/8″ type-x gypsum board on both sides, sound batt insulation and is made using 6″ metal studs. The STC rating is a single-number rating used to measure the sound insulation provided by walls, floors, ceilings, and other barriers. Glass size and glazing system will affect STC rating. ASTM E413 can also be Phone: 888-815-9691. S. The U. Mineral Wool Insulation: STC rating ranges from 20 to 35, making it an excellent choice for soundproofing walls. The higher the NRC rating, the better the sound absorption sound control insulation to reduce sound transmission between adjacent rooms such as offices, conference rooms, service areas and the like. Fire-resistant with melting point up to . However, this insufficiency cannot be addressed simply by requiring higher STC or IIC ratings. With STC ratings as high as 56* in a standard 2 x 4 wall assembly Rockwool Premium Plus™ Insulation has set the standards high. This rating system is called STC, sound transmission classification. ) and the manner of construction (stud spacing, wall thickness, etc. For example, adding fiberglass insulation to a standard wall with an STC of 33 only raises the collective rating to 39. In a typical 2 x 4 wall with a single layer of 1/2" drywall 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 Aug 9, 2022 · The higher the STC rating, the better the soundproofing properties of the material. A change from 30 to 45 represents a noise reduction of over 95%. 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. Insulation levels are specified by R-Value. They are logarithmic values and cannot simply be added. Use only unfaced insulation between wood framing and masonry chimneys. Blown A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). May 19, 2023 · This article will explore the six variables that affect STC ratings in walls. 34. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall A reference guide for acoustical assemblies and STC ratings in insulation systems, commercial roofing, and engineered products. Adding insulation between the walls of your rooms might be a great investment for your own peace and quiet. A higher sound transmission class rating indicates more effective sound insulation than a lower number. 33. Wall However, the STC rating will differ from room to room. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. Finally, now that I’ve introduced you to STC and different types of window insulation, it is my hope that you will manage to find the best possible option for your home and finally get rid of unwanted noise. STC is a standardized measure that rates how effectively a building partition, such as a wall or floor, can block airborne sound. 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 ZONA stc_rating_chart Author: Madalyn Mufson Created Date: 9/27/2024 11:50:47 AM Nov 7, 2016 · Looking at the chart above, once a wall gets to an STC of 45, loud speech is audible but not understandable. Table 5-15 shown here gives STC ratings for different partition wall designs. Of course, the higher the STC rating, the 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 standard requires a minimum laboratory STC rating of 50 for party walls and floor/ceilings. However, builders can install double-pane windows and add more insulation around the windows to mitigate sound overall. In a system using gypsum boards on 2x4s, the STC rating varies depending spacing. STC is widely used to rate interior partitions, ceilings/floors, doors, and windows. The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. Most often, the failure of the Oct 18, 2023 · How to Read an OITC Rating Chart. Products versus Spaces May 13, 2022 · Sound Transmission Class (STC) A Guide to True NRC™ Acoustic Rating. FIRM-FILL STC/IIC Ratings and UL Listings FIRM-FILL® SCM 125 3/4” (19mm) Gypsum Concrete Thickness Insulation Bare Ceiling Isolation FIRM-FILL® SCM 250 FIRM-FILL® SCM 400 Sound Control Mat Sound transmission class (STC) is a single number rating of sound isolation of a building wall assembly. Conclusion: STC Ratings for Windows. The Delta test is all that matters but most HOA groups have no idea how to interpret that information. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. The higher the STC rating, the better the sound isolation. The higher the STC number, the greater the reduction in sound. 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. Dec 18, 2023 · Above is another example of a factory wall. Staggered or double stud walls are higher rated than single stud walls. Address: 6301 N Florida Ave Tampa, FL 33604 insulation within 3 inches of light fi xtures or similar electrical devices unless device is labeled for contact with insulation. Don’t forget the ducts. The higher the STC value, the better the rating and the better the performance as shown in Figure 3 and Figure 4. R-40 Batt or Blown Insulation. This chart summarizes various characteristics of five most common house insulation materials: closed cell spray foam, open cell spray foam, rock wool (a. 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 best way to deal with impact noise is to cushion the actual blow or impact. When installed properly in accordance with the coverage chart, loose-fill cellulose insulation will not settle below the intended R-Value. 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. Most of the time, an assembly’s OITC rating is lower than an STC rating. Mar 5, 2021 · STC stands for sound transmission classification. Insulation Type STC. A heavy carpet and high quality pad work best to improve the IIC value of a floor/ceiling. The higher the STC value, the better a construction reduces the transmission of sound. Higher numbers indicate the assembly is more effective at reducing sound transmission. … Mar 22, 2022 · Six Things You Never Knew About STC Ratings. *OITC is estimate d base d on this test. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. 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. Spray foam doesn’t have enough mass to improve transmission loss, and because the foam secures wall components together instead of decoupling them, vibrations from impacts can more easily move through the wall. By federal law and industry standards compensation for settlement is built into cellulose insulation coverage charts. Jul 11, 2022 · The Basics of STC Ratings. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers May 13, 2024 · Here are some commonly-used soundproof insulation materials and their associated STC ratings: Sound Proof Fiberglass Insulation: STC rating ranges from 20 to 35, depending on the thickness and density of the material. The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound construction team and the design team to take this into account for higher STC ratings. perform better, as shown in this data chart by the National Research Council of Canada. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 Dec 13, 2022 · Mineral wool has an STC rating roughly ranging between 45 and 52, which is the highest among insulation materials. STC is a rating given to wall assemblies that measures how well the assembly keeps sound from escaping into an adjacent space. The higher the STC rating, the better the sound insulation performance of the construction. The IIC rating is also noted. Insulating plumbing walls can stop the dreaded toilet flush noise and help maintain privacy. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. 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. R-Value is a measure of insulation’s ability to resist heat traveling through it. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Jun 4, 2024 · Single-pane windows typically have a rating of 26-28, and it’s hard to significantly raise it. 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. Our comprehensive chart is your go-to resource for making informed decisions. STC: 45 Report No. 25 . 5” AcousticsAcoustics Assembly Number: ISS-11 STC: 46Report No. 9. A floating floor is another way to significantly improve an Fact: All loose-fill insulation products can settle over time. Fiberglass R-15 Unfaced. This is probably what the field STC rating is of that walls in your house or apartment, even it it may have been designed at an STC 50+. Jun 19, 2020 · Acoustic details help to ensure all materials are installed in a way that will help ensure field STC ratings match lab test STC ratings. Easily compare the technical details and advantages of all our mineral wool insulation products. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. Wall Assembly Acoustical Testing Results. You need the Building Management to tell you exactly what to use and get it in writing. 3 use 50 as the minimum STC rating for airborne and structural sound in multifamily homes. 5. The NRC (Noise Reduction Coefficient) value represents the percent of sound directed at the surface that is absorbed by the fiberglass acoustic insulation. Depending on the construction method and components used, SAB’s can improve STC (Sound Transmission Class) ratings by 4-10 points over an empty cavity. This is a UL U419 wall, so its STC rating is 50. RAL-TL90-195 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 5 The NRC (Noise Reduction Coefficient) value represents the percent of sound directed at the surface that is absorbed by the fiberglass acoustic insulation. Caution: You cannot add STC ratings. JM. An STC rating of 40 or more is considered to provide a good level of privacy. Resilient channel can improve the STC rating of an assembly. What does an STC rating of 45 mean? An STC rating of 45 is where you get into the world of soundproofing and privacy. As an example, let’s take a typical single-pane window and a masonry wall. The intent is to categorize the relative performance of an assembly in impeding or attenuating sound energy as it passes through the […] Find the right STC and fire-rated assemblies for your project, download Revit & CAD files, estimate materials, and find applicable Knauf Insulation products for each system. Foam board insulation can be used in a variety of home & building applications. Here’s a table showing what each STC rating represents: is the sound transmission class (STC). When tested in the field, an STC rating of a wall assembly will almost always be lower than the lab The following examples demonstrate improved STC values in floor/ceiling assemblies. Metal stud walls perform better than wood stud walls. Installing batt, roll or blown-in fiberglass insulation in a building will noticeably improve STC ratings. Open Cell Foam - Full Cavity. 7 per inch of thickness. Phone: 888-815-9691. There are many different opinions on what constitutes a ‘good’ vs ‘very good’ rating, as the definitions are up for personal interpretation. STC rating. You can see in this chart from Acoustical Solutions that each STC number correlates to the volume of speech heard through a –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. The higher the STC rating, the better the material prevents sound from passing through. You might get something around STC 35. 33 25 Closed Cell Foam - Full Sep 16, 2019 · The STC rating is not indicative of the number of decibels (dB) that will be reduced but represents a means of specifying materials for acoustical wall assemblies that will provide the required noise reduction (i. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. But what does that really mean? A sound transmission class chart is a simple way to understand the decibel scale and its relation to STC ratings. 8. 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 trave. The STC (Sound Transmission Class) rating is a single-num ber rating system for interio r build ing partitions and viewin g windows used to catego rize acoustic performanc e. Understanding STC Ratings for Drywall. OITC. STC is a method of rating airborne sound transmission performance of a wall or fl oor assembly. There is plenty of information out there at our fingertips, but it's important to get a full picture. Unfaced insulation is considered non-combustible by model building That means that the insulation R-value chart you will find below is basically an insulation thickness chart, based on 1 inch of insulation. 6. In general, a higher STC rating blocks more noise from transmitting through a partition. Created Date: STC: 45 Report No. 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. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. A higher sound transmission class rating indicates more effective sound insulation than a lower rating. Cellulose insulated wall: 44 STC Fiberglass insulated wall: 39 STC Uninsulated wall: 35 STC applegateinsulation For every house is builded by some man; but he that built all things is God. 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. FIIC — Field Impact Insulation Class in accordance with ASTM E 1007 and E 989. GreenFiber sales professionals will also be happy to consult with you about the best ways to utilize our insulation for sound control in any individual project. In the U. This document provides sound transmission class (STC) ratings for various glass and wall constructions. Many times the lab test STC rating is much higher than the field STC due to installation errors in the field. The STC rating has been in existence for many years and is based on speech sounds. Email: info@commercial-acoustics. Use this chart to find the right product. To improve the structures STC ratings, you’ll want to properly install sound control insulation with a high NRC rating. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall Jul 24, 2024 · Insulation ratings are measured in R-values per inch of thickness. The minimum Sound Transmission Class (STC) and Impact Insulation Class (IIC) ratings of 45/50 established by most codes for partition and floor assemblies often prove insufficient for many occupants. An R-value tells you how well a type of insulation can keep heat from leaving or entering your home. The STC is a standardized rating provided by ASTM E413 based on laboratory measurements performed in accordance with ASRM E90. Example: Fiberglass batt has a typical R-value of R-3. The STC rating figure represents approximately the decibel reduction in noise that the assembly can provide. When adding closed cell spray foam insulation to it, your STC rating will increase to 37. RAL-TL90-195 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 5 STC — Sound Transmission Class in accordance with ASTM E 90 and E 413. Oct 10, 2024 · 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 (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. The higher the better. 2. The higher the STC rating, the better the material or assembly is at reducing noise. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. e. Dec 7, 2023 · Through acoustic testing, you’ve determined an assembly has an STC rating of 50. –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. Mineral Wool Insulation Comparison Charts. Do not use insulation in spaces around metal chimneys, fi replaces, or fl ues. A high STC rating is better than a low one. mineral wool) blown-in cellulose and fiberglass batt. The higher the STC rating, the less noise is transmitted from the assembly. Testing done with full scale assemblies. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. 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. Here is a look at what can be heard under each STC level: epending on the assembly. Feb 19, 2022 · The STC rating reflects the decibel reduction of noise that a partition can provide (1 STC is equivalent to 1dB reduction), where a higher number, or rating, equals better results, or overall attenuation. This rating can be considered the baseline from where you are getting serious when it comes to preventing some transmission. 1. Many test Transmission Class (STC) ratings demonstrate its effectiveness in attenuating noise. an assembly comprised of ⅝” gypsum board, steel studs and ROCKWOOL SAFE’n’SOUND® insulation will produce an STC rating of Insulation will noticeably improve the STC rating of an assembly. Determine Target STCs E413-87 in an acoustica l wall. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. Address: 6301 N Florida Ave Tampa, FL 33604 Jun 16, 2023 · Learn about glass sound insulation, the importance of Sound Transmission Class (STC) ratings, and how higher STC ratings help reduce sound transmission. The primary structural components (concrete slab, wood frame, etc. 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. It includes STC ratings for commonly used materials such as: STC Rating STC Rating Static Door Operable Door Perimeter Seals Door Bottom Threshold Panel w/ Gasketing 30 30 103N, 107N, 120N, 122N 420N 897NS 127N, 133N, 134N, 137N 137S, 303N, 700N, 700S 30 30 130S 225S 896S Good Better Best; Ceiling Below Attics. STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. Use this STC rating chart as a rough guide to the different STC ratings for soundproofing materials: The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. Class (STC) rating. Sound Attenuation Batts are 1⁄8" wider than stud spacing for easy friction-fi t installation. RAL-TL90-192 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 1/2” gypsum Size 3 5/8” Steel Stud Spacing 24” oc Product AFB Thickness 1. That means that if we were to use 4-inch fiberglass batts, the overall R-value would be R-14. Cellulose 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. Apr 7, 2017 · The method of measurements we will be using is called Sound Transmission Class (STC). [Click to enlarge any image] Definition of STC, Definition of SRI , Definition of OITC How effectively a wall or floor reduces airborne sound is measured by STC ratings , detailed separately . 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 wall Sound Transmission Class (STC) is a single number metric used to measure airborne sound and is a function of the entire assembly construction. STC ratings are determined in a laboratory under controlled conditions. 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 Acceptable flooring alternatives to carpet and padding, installed on top of underlayment as specified in item #5 above, may include vinyl, luxury vinyl plank or hardwood provided that the chosen material meets or exceeds a minimum Impact Insulation Class (IIC) rating of 60 and Sound Transmission Class (STC) rating of 60. Contact Commercial Acoustics if you are considering options for your wall assembly, to improve your The Sound Transmission Class (STC) is a single number rating used to indicate the effectiveness of an entire construction assembly (partition, wall, floor/ceiling) in resisting the passage of airborne sound. This is where the Sound Transmission Class (STC) rating comes into play. STC ratings are pretty straightforward. Sep 23, 2024 · Typical STC Ratings for Common Materials. IIC — Impact Insulation Class in accordance with ASTM E 492. Get the details needed to use FOAMULAR® NGX® 250 XPS for your next project. advantage, including details on wall assemblies and their STC/OITC ratings. Single-pane window: STC 26; Standard drywall (no insulation): STC 33; SoundAssured 1 lb Mass Loaded Vinyl (MLV-100): STC 26; SoundAssured 2 lb Mass Loaded Vinyl (MLV-200): STC 33; Adding Mass Loaded Vinyl helps reduce noise transmission through walls, enhancing overall sound insulation performance. 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. 2,000 ̊ F (1,093 ̊ C). up to 10. 2 and 1206. Jan 28, 2024 · It is usually best to replace the entire window to regain the energy efficiency in your room. Outdoor-Indoor Transmission Class E413-87 in an acoustical wall. ) are both significant factors in determining the STC of a floor or wall. The acoustical performance of a wall assembly is measured using a single number rating system, where the higher the number the better the performance. Even then, differences of 1-2 points STC can occur for If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. That’s the best way to do it. Jul 25, 2012 · Why the STC Rating Numbers are so close in Value? STC rating measurement uses a special scale like the Richter Scale for earthquakes. Adding additional layers of drywall can improve the STC rating of an assembly. Mineral Wool STC BID@$"/@ 4/1 201 ohns Manville All Rihts Reserved Visi our ebsie a www. Although any insulation that homeowners can add to a wall will help reduce noise, an STC rating of 40 and above can be achieved using spray foam insulation or mineral wool. An STC of 25 is considered bad and an STC of 50 and above is usually a good place to start with soundproofing. The table below shows what levels of insulation are cost-effective for different climates and locations in the home. R-value insulation ratings vary based on the type, thickness and density of the insulation material. Aug 18, 2022 · As you can see from the chart above, neither insulation has a significant impact on the STC rating of a 2x4 partition wall. Products versus Spaces Sound transmission class (STC) is a single number rating of sound isolation of a building wall assembly. Feb 24, 2020 · What type of insulation is the best for soundproofing? A typical interior wall with ½” of drywall on either side has an STC rating of 34. STC 41 STC 51 STC 56 STC 59 STC 48 STC 55 • SINGLE LAYER 5/8” GYPSUM BOARD EACH SIDE • 5-1/2” CELBAR SPRAY NGC 2008023 • SINGLE LAYER 5/8” GYPSUM BOARD EACH SIDE • NO INSULATION NGC 2008020 • SINGLE They can say I got a 70/71 on the IIC/STC but they have a dropped ceiling blown full of insulation so it’s a gimmick. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition or through a wall. The higher the R-Value the better the thermal performance of the insulation. STC Rating Chart. Find out which JM mineral wool insulation products can stand in for our competitors’ products. Dec 6, 2024 · What Does an STC Rating of 50 Mean? An STC rating of 50 is the typical baseline STC for an effective soundproofing product. International Building Code (IBC) 1206. R-50 Batt or Blown Insulation: R-60 Batt or Blown Insulation: Cathedral Ceilings & Flat Roofs • Cellulose insulation outperforms all other insulation systems for sound attenuation. 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. Fiberglass R-13 Unfaced. k. Fire-resistant with melting point up to 2,000˚ F (1,093˚ C). 4. Oct 21, 2013 · How effectively a wall or floor reduces airborne sound is measured by STC ratings (sound transmission class). The STC rating reflects the decibel reduction in noise that a barrier can provide. Class (STC). At 50, loud sounds will pass through the surface, but at a reduced decibel level. A higher number indicates more effective sound insulation than a lower number. 3. 3 Conversely, fiberglass’ STC is much lower. Small increases can mean a lot of extra noise reduction. It is intended as a quick screening tool to compare different wall or fl oor assemblies. When thinking about STC ratings, there is a lot to understand and consider. STC & IIC Chart. Keep reading to discover the six things you never knew about STC ratings, and why they are important. Construction with spacing of 32” on center has the best rating (STC 38) while 12” on center construction drops the rating to 32. Check the STC rating chart above to have a better understanding of this. gfswdj eigbg zvo godg lwkvj gxql movvl uaule eigyn vyhi zmolay uid qulv vdlcyg tvb