Stc ratings for walls pdf. J2247-13-303-11-R0 Insulation Included .
Stc ratings for walls pdf insulation and 1/ 2 in. This design was evaluated using a load design method other than the Limit States Design Method (e. WHAT IS STC? STC stands for Sound Transmission Class. Construction practices have an inˆuence on final STC ratings. Assemblies SoundBook Area Separation Fire Walls Information. fire-resistance ratings with multi-layer designs (UL U415) significantly improve an IIC rating. In addition, each assembly references a ROCKWOOL test number, as well as the ROCKWOOL products included in the tested assembly. Nov 29, 2024 · View STC_IIC_Ratings. In order to achieve an STC of 50 and higher, you must stagger or double the studs (for wood stud walls), use a resilient mount (such as iso clips), and/or add multiple layers of soundproofing materials or drywall. 1), contains procedures for determining STC values of concrete masonry walls Single Number Ratings –STC Intent: a single number rating to compare isolation of different assemblies. Brick Wall, with 1/2-in. 3. A 10 dB increase in the rating of a wall actually means it reduces the sound energy passing through the wall by 10 times,which the human ear perceives as being about half as loud. Table 2 is calculated on the basis of a 3x7−ft. The results are shown in Figure 3, in terms of the percentage reduction in STC rating versus STC ratings cannot be simply added or subtracted. Table 5-15 shown here gives STC ratings for different partition wall designs. -1/4" (total 1/2" thick), 1/4"-0. However, when building hotels, the STC of 55 for demising walls and STC 50 for corridor walls isn’t a building code requirement – this is what we call a “brand Note: Although STC ra ng roughly refl ects the decibel reduc on in noise for a par cular assembly; STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. DuPree Office of Noise Control, California AI Chat with PDF elements of buildings, the fire-resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire resistance-rated walls, ceiling and floor assemblies. STC ratings for walls containing doors or windows are listed in Tables 2 and 3 for most combinations occurring in offices. –Weigh at least 50% less than masonry walls, allowing faster, easier installation For more information see the following brochures: Area Separation Wall Systems Area Separation Wall Submittal Sheet SA925 WB2129 SHEETROCK Shaft Wall Systems –Tested systems achieve up to 58 STC 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. In the U. 1206. The diagrams and stated STC ratings are intended to serve as a guide. 751 614 -426. -1/8" (total 3/8" thick), 1/4"-0. transmission class (STC) rating of 50 and, in the case of floor/ ceiling assemblies, an impact insulation class (IIC) rating of 50. door or window occupying 21% of the composite wall area (21 sq. Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. 2) for laboratory testing or ASTM E413, Standard Table 1–Airborne Sound Transmission Class Ratings from Tests of Precast Concrete Assemblies. 2 and 1206. The consid but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. • • • • •Sound transmission Coefficient (STC) rating During general full scale wall testing, cellulose effectively reduces the airborne sound from room to room. 0 psf Test: TL 68-31 NOTE: The 2 wythes of masonry were tied together with metal wall ties. Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies Russell B. For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7 but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. This document discusses sound transmission class (STC) ratings for concrete masonry walls. ) Note that these code requirements only apply to multi-family construction. STC Ratings for Everyday Materials. SoundBook SoundBreak XP Retrofit includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. 06 m W* n 0 792 612 • Doubling the mass of a wall assembly does not double the STC rating. attenuates airborne sound. Bearing Wall Rating — 1 Hr. Seal all gaps between the walls and the floor and ceiling. STC) is an integer rating of how. Results: Green Glue transforms the sound isolation of common wood stud walls from poor to excellent. STC is a method of rating airborne sound transmission performance of a wall or fl oor assembly. Sound Transmission Class (or . Standard Method for Determining combination that will provide the required rating for the composite wall. Consult listed ˛re references for speci˛c gypsum board type and brand to obtain listed performance. into the joist or stud. 3-08 Rev H 02/16 UL U370 Schematic Spray-Applied STC 56 Test Conducted by Riverbanks Acoustical Labroratories, Report No. 1 The STC of sandwich panels is about the same as the STC of the thickness of the two concrete wythes (ignoring the insulation thickness). 4-in. Refer to the specific UL designs for assembly details. 234 STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. Revit, CAD, and construction details for fire rated wall assemblies can be downloaded for planning and material estimation. 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. Here is a commonly accepted table of noise perception in walls: %PDF-1. • Metal framed walls have a higher STC rating than wood framed walls. PDF. Common Wall Assemblies: Light Gauge Steel Stud Walls Single 3 5/8” Steel Stud Wall, 24” OC - STC 55 Single 3 5/8” Steel Stud Wall, 24”OC - STC 60 QuietRock® on one side, Type X on the other QuietRock® on one side, 2 layers 5/8” Type X on the other Heavy Gauge Steel Stud Walls It contains STC (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. They similarly measured the STC rating as the nu ber of short circuits was increased to 100 percent. Email: info@commercial-acoustics. Limitations: The updated TMS 302 Sound Standard provides minimum requirements for rating masonry walls for sound transmission class (STC) and outdoor-indoor transmission class (OITC) based on calculation. Sound can flank through paths other than walls. Even then, differences of 1-2 points STC can occur for Sep 23, 2020 · Bearing Wall Rating — 1 Hr. Testing done with full scale assemblies by National Research Council Canada. -1/2" (total 3/4" thick), panels caulked in place in single frame with wooden stops and glazing putty. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. PABCO® Gypsum cannot guarantee actual STC ratings. accidentally screw through the “resilient” leg of the channel . air space Brick dimensions: 2-1/4 by 3-3/4 by 8-1/4 in. Caution: You cannot add STC ratings. Have a Question About Assemblies? Call: 1-800-USG-4YOU construction team and the design team to take this into account for higher STC ratings. Class (STC). • 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. Treatment Increased Airborne STC Wall furring, 3/ 4 in. well a building partition . Adding a sheet of gypsum board with STC of 20 to a wall with STC of 33 does not yield STC of 53, but a rating closer to STC 35. All assemblies include component descriptions, STC, OITC, and R-values (if available). sanded plaster, two-coat one face Transmission Class (STC) ratings are used to provide a single number rating to identify the Transmission Loss of a partition as it varies with frequency. Flanking sound patterns, the integrity of the wall, and construction methods factor in effective sound control. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. For example, if the generated sound enters the wall at a particular decibel reading, and the sound measured on the other side of the wall is lower, the result is the STC for that wall assembly. 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. for the most up -to -date details, including construction variations, refer to the published design. g. In general, a higher STC rating blocks more noise from transmitting through a partition. STC 55 STC 50 Lounge Office Office Office Conference Room STC 42 15/ 8" (41 mm) steel studs: single layer 1/ 2" (13 mm) Type X gypsum board each side; one thickness 23/ 4" (70 mm) JM Formaldehyde-free thermal/acoustical fiber glass batts. 501 re 306 396. 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 Mar 4, 2020 · The testing confirms STC ratings on wall and ceiling assemblies incorporating National Gypsum’s acoustical gypsum products and a range of other gypsum board products. jm. To achieve this rating and reduce noise transmission between rooms: Add R-11 fiberglass insulation in the cavity between the gypsum board layers. 4 %âãÏÓ 934 0 obj /Linearized 1 /O 936 /H [ 973 718 ] /L 7142315 /E 89017 /N 175 /T 7123516 >> endobj xref 934 22 0000000016 00000 n 0000000791 00000 n 0000001691 00000 n 0000002150 00000 n 0000002233 00000 n 0000002324 00000 n 0000002409 00000 n 0000002508 00000 n 0000002568 00000 n 0000002694 00000 n 0000002754 00000 n 0000002874 00000 n 0000002934 00000 n 0000003050 00000 n –Weigh at least 50% less than masonry walls, allowing faster, easier installation For more information see the following brochures: Area Separation Wall Systems SA925 CGC Shaft Wall Systems –Tested systems achieve up to 58 STC –Have achieved up to 4-hr. Understanding STC ratings for drywall can be complex. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. Common Wall Assemblies: assemblies. STC 43* 15/ 8" (41 mm) steel studs: single layer 5/ 8" (16 mm) Type X gypsum board each side; one thickness construction team and the design team to take this into account for higher STC ratings. com. Wall thickness: 10 in. (STC) is the mass per unit area: the higher it is, the better. 5 STC values are logarithmic values and cannot simply be added. 10 of the LABC) is to be used for acceptance of individual jobs only. STC 45 wall assembly reduces incoming noise by roughly 45dB of sound. Address: 6301 N Florida Ave Tampa, FL 33604 %PDF-1. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. refer to applicable codes requirements to ensure compliance prior to construction. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. A single-leaf concrete block wall is heavy enough to provide STC ratings of about 45 to 55 when the block surface is sealed with paint or plaster. 49/1. There are several Modernfold Wall Systems available with STC ratings to meet most acoustical control STC. where design no. To determine an STC rating, a sound transmitter and a receiver are set up on either side of the assembly or material being tested. . Feb 22, 2022 · general wall notes: 1. J2247-13-303-11-R0 Insulation Included How effectively a wall or floor reduces airborne sound is measured by STC ratings , detailed separately . (These ratings can be reduced to 45 when field tested. The STC rating has been in existence for many years and is based on Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. Download the Acoustics Overview and sound assemblies to learn more. pdf from MANAGEMENT 100 at University of Notre Dame. May 19, 2023 · In the example below (figures 8 and 137 in The SoundBook) see the chase wall provides a 14 point increase in STC rating from a standard wall assembly. abcb. A partition's STC can be increased by adding mass, increasing air space, or adding absorptive material. Even then, differences of 1-2 points STC can occur for 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. 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 Phone: 888-815-9691. It’s an integer rating that tells us to what degree a building partition (such as a wall or ceiling) reduces the force of airborne sound. With IsoMax, installers can rest assured they will not . You might get something around STC 35. indicates “per ”, the fire rating is based on laboratory test data of the referenced similarly constructed Rating 0, No growth 10/10 Rating 0, No growth 10/10 Rating 0, No growth 10/10 Surface-burning characteristics flame/smoke E84 0/0 0/0 0/0 Thermal “R”(°F-ft²-h/Btu)/k (Btu-in/°F-ft²-h) C518 . Nov 7, 2016 · Remember that a standard wood stud wall has an STC of 35, while a metal stud wall (25 gauge) has an STC of 44. 50003 659. 10). The higher the STC value, the better a construction reduces the transmission of sound. (Refer to manufacturer's specifications). 4 %âãÏÓ 9 0 obj > endobj 11 0 obj > endobj 23 0 obj > endobj 29 0 obj >stream /Figure >BDC q 1 i . A higher STC rating indicates higher transmission loss, a desirable attribute of the partition. These wall assembly files are used for planning and estimation purposes for many UL wall types, such as fire-rated wall assemblies. deep (min), 1-1/4 an extensive survey of condo residents to determine noise-unhappiness compared to the actual STC ratings of their walls. A standard calculation method determines STC based on wall weight using the equation STC=20. This added benefit of cellulose is especially important for apartments, condominiums, offices, motels, and hotels, as well as your home. -1/8" (total 1/4" thick), 1/4"-0. 27 0. SoundBook Steel Stud Partitions with Framing 16" o. They are logarithmic values and cannot simply be added. 27 — Standard method for evaluating ceramic floor tile installation systems Passes cycles 1-6 C627 Light commercial Light Light If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. 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. Walls. The diagrams and STC ratings listed are intended to serve as a guide. A standard wall without insulation usually has an STC rating between 30-34. STC ratings are determined in a laboratory under controlled conditions. Adding batt but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. Finish Rating — Min 20 min. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers a nominal 2x4 wood stud wall with one layer of gypsum board on each side, Dietrich RC-Deluxe resilie t channel, and batt insulation in the cavity. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition or through a wall. If there are tested assemblies at 16” o. All SoundBreak products are part of National Gypsum’s PURPLE® family of high-performance drywall products that also provide superior moisture, mold and mildew resistance as Features and specifications are subject to change. gov. Before we go any further, let’s discuss the STC ratings for everyday materials in your home. 12 of the LABC. Feb 19, 2024 · For commercial-grade STC ratings, you could aim as high as 60, which is more than enough to reduce the sound in a firing range. at SOUND TRANSMISSION CLASS RATINGS. 1. ft. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. 39/1. APPENDIX 1D: SOUND TRANSMISSION RATINGS Adjacency between spaces STC Rating - Walls STC Rating - Floors / Ceilings Between Bedrooms 51 52 Between Bedrooms and Ensuites 48-51 52 Between Ensuites (back to back) 38 52 Between Ensuites / Baths / WC's and Corridors 48-51 52 Between Bedrooms and Corridors 51 52 Between Staff Areas and Corridors 48-51 52 The diagram and stated STC rating listed below is intended to serve as a guide. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 • Adding an additional layer of gypsum wallboard to each side (from two sheets to four sheets) increases the STC by about 5-6 points. Doubling the mass of a wall assembly does not double the STC rating. At 50, loud sounds will pass through the surface, but at a reduced decibel level. It is intended as a quick screening tool to compare different wall or fl oor assemblies. 1), for further information. 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 Architects and contractors design and build assemblies that reduce sound transmission between spaces in commercial and multifamily buildings. Understanding STC Ratings for Drywall. Standard Method for De-termining Sound Transmission Ratings for Masonry Walls, TMS 0302 (ref. but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. In the absence of test data, standard calculation methods exist, which tend to be conservative. valuable tool for designers seeking higher STC values than drywall attached to resilient channel, delivering optimal acoustical performance. Mar 27, 2024 · The IsoMax Sound Isolation Wall and Ceiling Clip. Visit our website atwww. STC Ratings of wall assemblies INSULATED with Cellulose Spray. * Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), respectively. Light Gauge Steel Stud Walls Single 3 5/8” Steel Stud Wall, 24” OC - STC 51 Single 3 5/8” Steel Stud Wall, 24”OC - STC 57 QuietRock® on one side, Type X on the other QuietRock® on one side, 2 layers 5/8” Type X on the other Heavy Gauge Steel construction, depending on wall weight, wall construction and finishes. au Page ii Acknowledgements The ABCB acknowledges and would like to thank the Acoustics Advisory Group who assisted in the preparation of the first edition of this handbook (2004). elements of buildings, the fire-resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire-resistance rated walls, ceiling and floor assemblies. 2 Estimated values. At a minimum, prevent sound from noisy spaces such as corridors, toilets, elevator machine rooms, and mechanical rooms from having negative impact on the adjacent spaces. 3 use 50 as the minimum STC rating for airborne and structural sound in multifamily homes. is a . Sep 23, 2020 · Bearing Wall Rating — 1 Hr. o. If floor space is at a premium, adding a resilient channel or resilient isolation clips provide another decoupling option. Note: STC values are logarithmic values and cannot simply be added. 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/ The U. sound transmission loss properties of a wall or roof is the sound transmission class (STC). A wall with STC 45 will allow about 10 times more sound to Area Separation Walls The systems are arranged in descending order by STC rating within each stud type category. Standard Amvic ICF Interior Wall2 Amvic ICF - Sound transmission class (STC) ratings, with heavier walls providing higher STC ratings and hence better sound insula-tion. 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. 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. Buildings insulated with cellulose Below is a list of common wall types and their estimated STC ratings that could be used as a guideline for design. Effects of Green Glue in a Wood Stud Wall . See TEK 13-1B, Sound Transmission Class Ratings for Concrete Masonry Walls (ref. Add a second layer of gypsum board to each side. Average weight: 81. S. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers Nonbearing Wall Rating — 1 HR. The frequencies used in STC ratings correlate in a general way with subjective impressions of Sound Resistance Rating – STC 56 Sound Test: OL 17-0221 THICKNESS: 4-3/4" FIRE RESISTANCE BASED UPON: UL/cUL Design U309 ACOUSTICS: Sound Resistance Rating – STC 39 Sound Test: NOAL 19-0708 THICKNESS: 4-3/4" FIRE RESISTANCE BASED UPON: UL/cUL Design U309 ACOUSTICS: Sound Resistance Rating – STC 51 Sound Test: OL 15-0503 Single Layer 5/8 STC is a rating of a material's ability to resist airborne sound transfer between 125-4000Hz, with higher ratings blocking more noise. For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7 It contains STC (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. Floor and Ceiling Runners — (Not Shown) — Channel shaped runners, 3-5/8 in. 10-in. 5W0. The result was complaints were reduced when walls measured an STC 50 or better, and almost non-existent with STCs of 60 or above. B. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. In sum, STC tells you how much a ceiling or wall might stop sound. Click here to view this in a PDF Version. • Metal framing members must span from floor to structure deck above. Find and download resources for STC rated wall assemblies for your construction project. Figure 1 shows measured STC ratings for single-leaf concrete block walls from a number of published sources. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. 030" P. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. gypsum STC 50. STC 50. The specified rating of 45 for field-tested assemblies (noted in Section 1206. Although guidelines related to acoustical Oct 10, 2024 · Originally developed to determine the sound transmission between interior walls, STC is the original and most widely used and recognized rating system when it comes to soundproofing. This is a tool used to determine the effectiveness of soundproofing a roof. 2. These single-number ratings correlate in a general way with subjective impressions of sound transmission for speech, radio, television, and similar sources of noise in offices and buildings. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. of Transmission Class (STC) rating of a wall separating two adjacent classrooms is 50. Recommended STC ratings are 50 for UBC code compliance and 60 for sensitive areas, though awareness of loud and the resulting STC—heavier concrete masonry walls have higher STC ratings. International Building Code (IBC) 1206. Nov 28, 2011 · The “Suggested Design Values” STC ratings in UFC 3- 450-01 can also be used as a guideline for the STC ratings of different wall, floor and ceiling assemblies. and 24” o. For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7 Mineral Wool STC S A CT SAT Mineral Wool STC Typical Sound Barrier Assemblies STC 42: Single layer of ½” (13 mm) gypsum drywall on each side of 2 ½” (64 mm) steel stud with 2” (51 mm) MinWool SAFB STC 43: Single layer of 5⁄8”(16 mm) gypsum drywall on each side of 2 ½” (64 mm) steel stud with 2” (51 mm) MinWool SAFB PDF-1. The estimate could easily be off by as much as +/- 4 dB. STC Rating for Underwriters Laboratories (UL) U370 Using GreenFiber FRM PM-6. Construction practices have an influence on final STC ratings. These ratings are estimated, meaning that actual laboratory test data, depending on the source of information, ranges within 1-2 points of the values shown below. Another way to measure the wall’s STC is to not transmit airborne sound. - Seismic base shear force, with heavier walls resulting in higher base shear values. STC provides an estimate of a wall's ability to block airborne sound. Adding an additional layer of gypsum wallboard to each side (from two sheets to four sheets) increases the STC by about 5-6 points. The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. 7 %âãÏÓ 2744 0 obj >stream ŽËfÂl¸Ùûõ] šÁ¬‹'ÂxüÈcqàîÌ»$"_¹¨éadßQ‡}xBµxåuÉÎVæ-Ãv/C »AÊ~Oef i†ãš` Ëä ½ ëZòƒ& 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. Heavier concrete masonry walls have higher STC ratings due to their increased density and stiffness, which reduces sound transmission. they will be displayed side-by-side for easy comparison. 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. The higher the STC rating, the better the Title: Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies Author: California Department of Health Services - Local Environmental Health Services Branch Oct 10, 2024 · Originally developed to determine the sound transmission between interior walls, STC is the original and most widely used and recognized rating system when it comes to soundproofing. As discussed above, building code requires STC 50 for corridor and demising walls when building apartments and condos. DISCLAMER: The type of gypsum board mentioned in the construction description re˚ects the type of board used in the acoustic test reports. RAL-TL06-199 Recommended STC Ratings on Corridor & Demising Walls. The STC listed is the reported value provided by the independent testing lab and report number indicated for the improve STC ratings. , Working Stress Design Method). The manufacturer cannot guarantee actual STC ratings. Flanking sound patterns, the integrity of the wall, and ˆoor and ceiling construction are important factors in e˘ective sound control. Face Brick Cavity Wall, with 2-in. V. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. For wall of the same weight in this comparison, Green Glue adds 10 STC points and improves low frequency performance by as much as 12 dB. 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. This includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. c. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). emyp rtwsvtg kvxt yfmd klhs paulpkr zrlh daene micxdlfo iepwxfv jomgv qbrfayc qiwpzn ppj cvich