Wall insulation stc rating chart. (Refer to manufacturer's specifications).
Wall insulation stc rating chart Made from stone, Safe'n'Sound® Insulation. JM Mineral Wool Mineral Wool Properties Short Mineral Wool Properties Long Mineral Wool Product Comparison Chart Mineral Wool 2. com. . A higher sound transmission class rating indicates more effective sound insulation than a lower rating. STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. , drywall type, insulation), construction techniques (e. an assembly comprised of ⅝” gypsum board, steel studs and ROCKWOOL SAFE’n’SOUND® insulation will produce an STC rating of Mineral Wool STC BID@$"/@ 4/1 201 ohns Manville All Rihts Reserved Visi our ebsie a www. 6 %âãÏÓ 90 0 obj > endobj 109 0 obj >/Filter/FlateDecode/ID[236EAF479D939946B4A67A1EADC670D0>]/Index[90 33]/Info 89 0 R/Length 89/Prev 160617/Root 91 0 R For reference, the International Building Code (IBC) requires a minimum lab-tested STC rating of 50 per ASTM E90 for walls, floors, and ceilings in new multi-family construction. Due to its The method of measurements we will be using is called Sound Transmission Class (STC). Transmission Class (STC) of walls and fl oor/ceiling assemblies. All holes and gaps should be filled and the enclosure hermetically sealed for sound isolation to be effective. Soundproofing walls with insulation or air space inside them also reduces sound transmission. ASTM International, 2010. Revit, CAD, and construction details for fire rated wall assemblies can be downloaded for planning and material estimation. The Celbar RL system offers One, Two, & Three-Hour UL Fire-Rated Wall Assemblies to meet and exceed building code requirements for fire safety and sound transfer. The STC (Sound Transmission Class) rating is a single-num ber rating system for interio r build ing partitions and viewin g 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. JM. Learn why STC ratings matter for soundproofing. Measure the sound in the adjacent room: Then, go to the adjacent room and take a second recording of the number In multi-family housing Rockwool Premium Plus™ Insulation has one of the highest STC ratings for a party wall assembly, 69*. 5” Acoustics Assembly Number: ISS-22 STC: 50Report No. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. 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. That’s enough to reduce your sound bleed to a point where normal activities Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. STC 27 Wall Component Starting wall: Uninsulated wood studs This STC Wall Calculator estimates the Sound Transmission Class (STC) rating of a wall assembly based on various materials and configurations. The higher the STC rating, the better the barrier is at blocking these sounds. Uninsulated 2×4 wood stud walls have an STC rating of about 33. Videos. Source Intensity Level; Threshold of Hearing (TOH) 0 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. In the USA, it is widely used to rate interior partitions, Explore the STC rating chart for walls, glass, windows, doors, and materials. , it is widely used to rate interior partitions, ceilings, 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 The STC of wall assemblies complete with the installation of cellulose insulation can be estimated by using the table below. RAL-TL90-186 Insulation Included: ROCKWOOL The STC ratings for windows and glass can range from 18 to 65, depending on the type and thickness of the glass. Owens Corning’s patented Hydrovac® process technology make the unique closed-cell structure of FOAMULAR Concrete Block Wall with Insulation - STC rating between 48 and 55; Specialized Acoustic Wall system - STC rating of 50 or above; Naturally, these are just approximations, and a lot of different factors can affect the STC rating of a specific wall. Unlike thermal insulation, Safe'n'Sound® is used for soundproofing interior walls and for ceilings between rooms. The higher the rating, the less noise penetration. Sound transmission reduction wall designs are given for both single stud and staggered double stud structural and partition walls. A Sound Transmission Class (STC) rating is a measure of how much sound travels from one side of the wall to the other, and is measured in decibels. The estimate could easily be off by as much as +/- 4 dB. JM Mineral Wool STC Ratings. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. Adding insulation between the walls of your rooms might be a great investment for your own peace and quiet. , Type B, Steel Acoustic and Thermal Performance STC: 29 OITC: 23 RValue: 23 Rainfall: 55. 77” GAF" Polyisocyanurate 1. (Refer to manufacturer's specifications). "The Facts About the Acoustical Performance of Metal Building Soundproof Walls – Increase STC Ratings. Staggering the studs or using dual studs can provide a substantial increase Adding more insulation can have a profound effect on a wall assembly’s STC rating because it adds sound-absorbing material to the assembly. The higher the better. A rating of 45 or higher is considered almost “soundproof. In the examples below (figures 6 and 7 in The SoundBook), going from an uninsulated wall Phone: 888-815-9691. • Metal framed walls have a higher STC rating than wood framed walls. Miscellaneous. To improve the structures STC Find and download resources for STC rated wall assemblies for your construction project. ” However, the STC rating will differ from room to room. A high STC rating is better than a low one. The STC rating reflects the decibel reduction in noise that a barrier can provide. Limited Warranty STC ratings tell you how well a wall, window, ceiling, door, etc. The higher the number, the higher the acoustic performance. Adding batt STC Rating Chart. 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 not understandable. Created Date: 5/18/2020 3:00:41 PM significantly improve an IIC rating. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 STC (Sound Transmission Class) ratings represent the ability of an assembly to reduce sound decibel levels transferred through walls, ceilings and floors. Often times, specialty insulations do not perform any better than standard batt insulation. For example, if you have a type of insulation that has an R 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). Learn how to install fiberglass batts, rolls and other insulation into attics, walls, and more. Staggering the studs or using dual studs can provide a substantial increase How It Works: Airborne noise travels through air gaps and weak points in walls and floors. If you can clearly hear them talking, expect your glass wall to have an STC rating of about 25. 3 Conversely, fiberglass’ STC is much lower. Most often, the failure of the R-21 EcoTouch ® insulation is designed to eliminate R-value loss caused by compressing standard R-19 Fiberglas™ insulation into 2x6 exterior walls. See Forms Available chart: Water Vapor Permeance: ASTM E96: Kraft Faced: 1. STC rating chart . 800-782-5742 Talk to an expert! MAIN MENU MAIN MENU. 030 P. ) based on its ability to reduce sound coming through it. Address: 6301 N Florida Ave Tampa, FL 33604 Explaining STC (Sound Transmission Classification), IIC (Impact Insulation Class), and Delta-IIC (Delta Impact Insulation Class). The STC is a standard grade issued by ASTM E413 based on lab measurements conducted according to ASRM E90. e. g. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. V. B. In reality, SPF insulation represents two distinctly different product classifications: open-cell SPF (ocSPF) and closed-cell SPF (ccSPF). (3 mm) mat 3/4 Wall Assemblies with thermal batts provide Acoustic Ratings (STC) that are very similar to ratings of Wall Assemblies with Acoustic Batts. 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 improve STC ratings. 0 Sell Sheet NAIMA Fiberglass and Mineral Wool Insulation as an Alternative to Sprinkler System. Commercial Acoustics explains how to determine the STC of a Wall, and what most common STCs are achieved with conventional construction methods. A standard wall without Pitch The oscillation rate of a sound wave, which travels as a small pressure change alternating above and below the static (at rest) state of the conducting material. These R-values are a sum, meaning this should be the total R-value once you add up the entire depth of insulation. Sources of Airborne Noise: Conversations, televisions, music, and in a 2 x 6 wall cavity will add approximately 14dB to the STCrating. 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 Find your zone on the map and then use the above insulation R-value chart to determine the level of insulation you need to properly insulate your attic, walls, floors and crawlspaces. • Cellulose insulation outperforms all other insulation systems for sound attenuation. Find out why in the seller's fact sheet on R-values. See chart below displaying the “diminishing returns” of simply adding mass to a partition. Glass siz e and glazing system will a˜ect STC rating. This wall did not receive a full perimeter seal. Learn more. RAL-TL90-186 Insulation Included: ROCKWOOL 1206. STC rating goes from 25 – 65. Building Insulation Canada (All Products) Residential Building Climate Pro B7600 Extended Coverage Chart Climate Pro B7600 Cavity Wall (Sidewall) Application Acoustical Assemblies STC Rating Reference Guide. Installing insulation on interior walls has special requirements. The NRC (Noise Reduction Coefficient) value represents the percent of sound directed at the surface that is absorbed by the fiberglass acoustic insulation. 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. %PDF-1. However, as a general rule, the underlying material, thickness, and presence or absence of (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 . Adding mass only “counts” if it across The STC wall rating chart measures between 45 – 80. ” Continuous Insulation for Cavity Wall Systems. Download our comprehensive chart, featuring STC ratings for commonly used materials >> Increasing the overall thickness of walls is the simplest method to raise your STC rating. All other options As you can see from the chart above, neither insulation has a significant impact on the STC rating of a 2x4 partition wall. Technical Information • The kraft facing on this insulation will burn and must %PDF-1. The number of waves occurring per second is the frequency, which is measured as hertz (Hz); one Hz equals one cycle per second. this wall blocks 20 dB at 100 Hz, but 65 dB at 5000 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 E413-87 in an acoustical wall. The easiest, but less precise way to determine the STC of a partition involves an SPL meter and ambient white Installing insulation within a wall or floor/ceiling cavity will improve the STC rating by about 4-6 dB, which is clearly noticeable. STC Rating Documents. 05” Sarnafill" Sikaplan 1. STC Rating: What can be heard at this level: 25: Soft speech can be heard and understood: 30: You can add insulation inside the walls which also stops Batt insulation for walls, attics, floors and more made with Ecose technology for superior thermal and acoustic performance. STC Wall Rating Chart. It includes STC ratings for commonly used materials such as: How to Read an OITC Rating Chart. Using the sound transmission class chart below, a rating of 50 means only very loud sounds can be heard through the assembly. The chart shows the R-value of this insulation. 4 dB Assembly Components Membrane: Insulation: Insulation Deck: 0. Double layer of Steel Studs Wood Studs Resilient Channels 89 This chart on Wikipedia offers a comparison of STC ratings for different types of wall treatments, including no treatment. S. Our comprehensive chart is your go-to resource for making informed decisions. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. 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. The higher the STC rating, the better the material is at reducing sound. 7 dB Assembly Components Metal Roof System 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. On the other hand, ASTM E413 can also be used to get comparable ratings from field measurements conducted in line with ASTM E336. Fire-resistant with melting point up to 2,000˚ F (1,093˚ C). For instance, a solid eight-inch wall would transmit more sound than Insulation Type: Select insulation materials that enhance soundproofing. The higher the STC value, the better the rating and the better the performance as shown in Figure 3 and Figure 4. Thermafi ber offers industry leading technical and engineering The greater the number, the more efficient the sound insulation. In the U. This method creates a dense and effective thermal barrier that reduces air leakage and enhances the overall comfort of the home. The intent STC (Sound Transmission Coef˛cient) acoustical performance than nominal equivalent thickness, approximately 265% higher density mineral ˛bre (rock/slag insulation walls at ceilings and ˚oor attachments. Metal studs perform better than wood studs. Both categories of SPF are chemically 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 side, wood studs, batt insulation in wall . 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/ 16 ROCKWOOL Acoustic Wall Assemblies Catalog ROCKWOOL Acoustic Wall Assemblies Catalog 17 STC 50 Assembly Components Finish material 1/2” gypsum, 2x 1/2” gypsum on single side Size 2 1/2” Steel Stud Spacing 24” oc Product AFB Thickness 1. The STC rating of a wall can be influenced by various factors, including the materials used (e. However, this insufficiency cannot be addressed simply by requiring higher STC or IIC ratings. The higher the R-value, the 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. 85” GAF" Polyisocyanurate 2. It forms a seamless blanket of insulation that completely fills around pipes, wires and other objects inside the cavity to maximize thermal efficiency and 16 ROCKWOOL Acoustic Wall Assemblies Catalog ROCKWOOL Acoustic Wall Assemblies Catalog 17 STC 50 Assembly Components Finish material 1/2” gypsum, 2x 1/2” gypsum on single side Size 2 1/2” Steel Stud Spacing 24” oc Product AFB Thickness 1. Installing insulation within a wall or floor/ceiling cavity will improve the STC rating by about 4-6 dB, which is clearly noticeable. In addition to the record-setting weight load design of 1,415 lb per stud, Celbar RL has been thoroughly tested to achieve exceptional STC ratings of 56, 61, and 64. Have a Question About Assemblies? Call: 1-800-USG-4YOU provides. Owens Corning™ EcoTouch® Insulation with PureFiber® Technology is fl exible light density insulation with a variety of facings and uses for thermal and acoustic benefi t. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. Long Term Performance Perm Rating ASTM E 96 R-values differ. o. Stud Type: Specify whether you’re using metal or wood studs. Loud speech not heard, music systems / heavy traffic noise can potentially be heard : 50 Most ICFs with a six-inch concrete core (10- or 11-inch ICF wall) advertise STC ratings of 50 to 55. It’s an innovative, high-density insulation that’s specifically designed to absorb sound and reduce noise from travelling from one room to another. Testing done with full scale assemblies. • Metal framing members must span from floor to structure deck above. This Acoustics Wall Assemblies Catalog provides a comprehensive list of wall assemblies tested for their acoustic performance. STC 47: Standard solid wall with insulation (ASTM E90) STC 41: Standard solid wall without insulation (ASTM E90) Mineral wool has an STC rating roughly ranging between 45 and 52, which is the highest among insulation materials. Sound Control Insulation Exceptional sound and noise absorption Excellent Thermal Performance (R-value of 3. The STC of the entire wall equates to 56. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. Open cell spray foam ties with standard fiberglass at an STC rating of 39 as well. Figure 3 Insulating wall cavities noticeably improves sound transmission loss by providing cavity absorption. 12 of the LABC. Discover the Virtual Sound Experience Immerse yourself in a realistic sound-simulation tool to experience the acoustical performance of Knauf. *OITC is estimated based on this test. For further help, check out the STC rating chart below. Does double drywall reduce sound? STC Ratings & Steel Stud Framed Walls . windows and wall insulation to achieve the desired overall rating. Each cycle of compression and re-expansion is a wave. Wall STAGGERED STUD WALL PARTITION STC Ratings of wall assemblies INSULATED with CelBAR Spray. The STC rating is a crucial measure The STC Calculator is a tool designed to provide expected STC ratings of your UL assembly based on stud size and spacing, wall types, and drywall layers. Email: info@commercial-acoustics. This includes both STC and OITC ratings for steel and wood STC Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. You can see in this chart from Acoustical Solutions that each STC number correlates to the volume of speech heard through a Fiberglass (or traditional) insulation falls in the middle range of options bringing the STC rating to 39. • Doubling the mass of a wall assembly does not double the STC rating. Mineral Wool Insulation Comparison Charts. Glass size and glazing system will affect STC rating. However, soundproof windows can have an STC rating of 48-54 or higher, providing significantly better sound 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. How Is a Wall’s STC Rating Calculated? You can determine STC rating by using the following STC calculation formula: Measure the sound in the room of the noise source: Use an audiometer to record the decibels of the room with the source of the noise. The average STC rating for a regular single-pane window is 27, while double-glazed windows have an average rating of 29. For example, adding fiberglass insulation to a standard wall Rigid Foam Insulation Owens Corning FOAMULAR 250 extruded polystyrene insulation is ideal for wall furring, perimeter/ foundation, cavity wall, crawlspace, pre-cast concrete, under slab, roofi ng systems, sheathing and other applications. A wide variety of STC ratings is available with concrete masonry Standard Classification for Rating Sound Insulation, ASTM E413-10. 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 BIBS is a proven, state-of-the-art insulation system utilizing specially manufactured fiberglass blowing wool installed in walls, floors, attics, or ceilings behind a proprietary fabric. A small gap in the wall can greatly reduce the STC rating. 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 These wall assembly files are used for planning and estimation purposes for many UL wall types, such as fire-rated wall assemblies. If you hear a conversation, but can no longer understand what’s being said, expect an STC rating of about 30-35. Lastly, you’ll find mineral wool insulation with the highest STC rating of E413-87 in an acoustica l wall. Aside from knowing how to determine STC rating (Sound Transmission Class rating) is a score given to a building’s surface (wall, ceiling, window, etc. 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 Adding standard fiberglass insulation improves the rating to STC 39. High STCs may also be achieved by using a vinyl barrier (such as mass loaded vinyl) in the wall to improve soundproofing performance, especially with metal stud wall assemblies. The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. Adding sound rated insulation can improve that to STC 45. 4 %âãÏÓ 3391 0 obj > endobj xref 3391 34 0000000016 00000 n 0000002489 00000 n 0000002667 00000 n 0000002704 00000 n 0000003810 00000 n 0000004220 00000 n 0000004270 00000 n 0000004385 00000 n 0000004640 00000 n 0000005064 00000 n 0000006394 00000 n 0000007650 00000 n 0000008850 00000 n 0000009977 00000 n The acoustical performance of a wall assembly is measured using a single number rating system, where the higher the number the better the performance. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. This option provides so a bit more privacy and blockage from sound entry. 1/8" 35 35 ZONA stc_rating_chart Author: Madalyn Mufson Created Date: %PDF-1. stops sound. Most of the time, an assembly’s OITC rating is lower than an STC rating. A “good” STC rating is probably about 50 and can usually be accomplished with a standard wall assembly with insulation and Green Glue. jm. 9. 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. At around 55, Drywall without any other insulation, such as foam, is not a good insulator in itself as the sound waves travel right through it. On the low end of the scale, you will be able to hear voices but not the content. Phone: 888-815-9691. 8 per inch) Adds STC value to wall and fl oor-ceiling Brochure (TF885) for more detail on STC and fi re ratings for multiple wall and fl oor-ceiling assemblies. The Chart below shows how noise relates to decibel ratings. 10 of the LABC) is to be used for acceptance of individual jobs only. This rating system is called STC, sound transmission classification. and hard-to-reach spaces in attics and wall cavities. 2003, 2006, 2009, and 2012 It contains STC (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. 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 WALL & FLOOR ASSEMBLY GUIDE Insulation for Sound˜& Fire Rated Assemblies (STC). There are numerous other issues that need to be addressed to get a more accurate The Basics of STC Ratings. *OITC is estimate d base d on this test. Visit our website atwww. Of course, the higher the STC rating, the better. If the sheetrock is up, you can only use blown-in insulation. STC ratings are pretty straightforward. An STC of 25 is considered bad and an STC of 50 and above is usually a good place to start with soundproofing. Address: 6301 N Florida Ave Tampa, FL 33604 These tests have indicated a direct relationship between wall weight and the resulting STC—heavier concrete masonry walls have higher STC ratings. 24 mm) 1/8" 0. Building the same wall using 2-1/2” metal studs with 1/2” drywall on each side you get an STC of 34; add same sound rated insulation can bring the rating to STC 47. Doors Where optimum noise control is desired, solid wood core doors should be Here we define STC - sound transmission class and we provide a table of design details that show STC rating for various building wall framing designs. 0 perms or less; FSK-25 and SPRAY POLYURETHANE FOAM INSULATION . NIC [] STC: 26 OITC: 21 RValue: 23 Rainfall: 54. 51” Fabral 22ga. , staggered studs), and the presence of resilient Comparison Chart of Different Types of Home Insulation Materials. For example, the walls inside your house likely have an STC rating of 33. This STC rating chart shows a variety of building materials, their average STC rating 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. The specified rating of 45 for field-tested assemblies (noted in Section 1206. Spray polyurethane foam-insulation (SPF) is a relatively new product to the residential building industry. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. 5½ " thick R-21 EcoTouch® insulation delivers 19% more R-value than compressed 6¼ " R-19 Fiberglas ™ insulation. R means resistance to heat fl ow. Adding batt insulation adds absorption into the cavity for the sound emanating from the source‐side drywall, and also adds damping to the wall. • An 18 mil metal framed wall and a layer of 1/2" gypsum board on each side of the wall will provide a STC value of 30-35. Bedrooms should have a rating of 52, while bathrooms, kitchens and living rooms have a rating of 55. What’s not on this chart: comparisons for using other types of drywall (like QuietRock ), or more efficient types of insulation (like cellulose or rock wool ), or layering Green Glue between a second layer of drywall † 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: † IIC (Impact Insulation Class) - used to rate the impact sound transmission of floor assemblies to areas below. The table below illustrates sound proofing test results from a wall partition that has a theoretical maximum loss of 40 dB from Continuous Insulation Curtainwall Window Wall Fire Stop Thermal Acoustic/Fire wall assembly STC ratings by up to 10. zydp efhjd bdlmmqf kciohx damf fgd egyeel mzlsg idvidp cendef ascf okqu bkoteh xne jpmyh