Stc ratings for walls pdf 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 %PDF-1. attenuates airborne sound. Even then, differences of 1-2 points STC can occur for The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. See TEK 13-1B, Sound Transmission Class Ratings for Concrete Masonry Walls (ref. 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. 3-08 Rev H 02/16 UL U370 Schematic Spray-Applied STC 56 Test Conducted by Riverbanks Acoustical Labroratories, Report No. jm. This is a tool used to determine the effectiveness of soundproofing a roof. Penetrations Through Rated Wall and Floor Assemblies. WHAT IS STC? STC stands for Sound Transmission Class. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. J2247-13-303-11-R0 Insulation Included STC Wall Assemblies Mold/Mildew/Moisture Resistant Approved For Use on Walls and Ceilings Soundbreak XP Gypsum Board is an acoustically enhanced gypsum board used in the construction of high STC wall assemblies. Address: 6301 N Florida Ave Tampa, FL 33604 STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. 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 If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. Common Wall Assemblies: assemblies. Download the Acoustics Overview and sound assemblies to learn more. A higher STC rating indicates higher transmission loss, a desirable attribute of the partition. Walls. take this into account for higher STC ratings. gypsum 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. where design no. Sound Transmission Class (STC) ratings than traditional drywall and other demountable walls. . • Metal framed walls have a higher STC rating than wood framed walls. The TMS 302 Sound Standard provides minimum requirements for rating masonry walls for sound transmission class (STC) and outdoor-indoor transmission class (OITC) based on testing calibrated calculation procedures. 10-in. The result was complaints were reduced when walls measured an STC 50 or better, and almost non-existent with STCs of 60 or above. Table 2 is calculated on the basis of a 3x7−ft. Add a second layer of gypsum board to each side. The higher the STC rating, the better the 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. Integrated double-glazed door options maintain the integrity of the wall’s STC rating, protecting the acoustical privacy so the sound barrier is not compromised. The manufacturer cannot guarantee actual STC ratings. The diagrams and STC ratings listed are intended to serve as a guide. • Implications: (STC) is the mass per unit area: the higher it is, the better. 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. The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound Class (STC). (These ratings can be reduced to 45 when field tested. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. Finish Rating — Min 20 min. (Refer to manufacturer's specifications). They resist intermittent lateral loads up to 15 psf; also resist fatigue failure under cyclic lateral loading. 1), for further information. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. transmission class (STC) rating of 50 and, in the case of floor/ ceiling assemblies, an impact insulation class (IIC) rating of 50. significantly improve an IIC rating. The consid­ but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. CAD/Revit & Acoustics. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. There is no reason to spend money or effort to improve the walls until all the weak points are controlled. Have a Question About Assemblies? Call: 1-800-USG-4YOU This document provides sound transmission class (STC) ratings for various glass and wall constructions. This design was evaluated using a load design method other than the Limit States Design Method (e. Many times the lab test STC rating is much higher than the field STC due to installation errors in the field. 3. heavier concrete masonry walls have higher STC ratings. Locally Made. STC ratings are determined in a laboratory under controlled conditions. com. B. Address: 6301 N Florida Ave Tampa, FL 33604 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. 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). 234 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. STC 45 wall assembly reduces incoming noise by roughly 45dB of sound. Repair Details. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. 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 A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). Sound can flank through paths other than walls. - Seismic base shear force, with heavier walls resulting in higher base shear values. You might get something around STC 35. A standard calculation method determines STC based on wall weight using the equation STC=20. Visit UL U419 on the UL website. 6 %âãÏÓ 606 0 obj > endobj xref 606 21 0000000016 00000 n 0000001523 00000 n 0000001608 00000 n 0000001742 00000 n 0000001970 00000 n 0000002582 00000 n 0000003199 00000 n 0000003236 00000 n 0000003436 00000 n 0000003622 00000 n 0000003700 00000 n 0000003776 00000 n 0000005949 00000 n 0000006014 00000 n 0000006091 00000 n 0000006166 00000 n 0000008859 00000 n 0000009774 00000 n 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. STC 43* 15/ 8" (41 mm) steel studs: single layer 5/ 8" (16 mm) Type X gypsum board each side; one thickness STC 50. Standard Method for Determining Sound Transmission Ratings 50 if laboratory tested or 45 if field tested. The higher the STC value, the better a construction reduces the transmission of sound. † Between wood or steel stud framing faced with gypsum boards Components PINK colour, bonded glass fibre manufactured from National Gypsum Company has published the industry’s most comprehensive guide for sound-rated assemblies. Standard Method for Determining an extensive survey of condo residents to determine noise-unhappiness compared to the actual STC ratings of their walls. The STC rating has been in existence for many years and is based on 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. 49/1. Wall thickness: 10 in. 5 STC values are logarithmic values and cannot simply be added. at SOUND TRANSMISSION CLASS RATINGS. PABCO® Gypsum cannot guarantee actual STC ratings. • Metal framing members must span from floor to structure deck above. 2) for laboratory testing or ASTM E413, Standard Sound Resistance Rating – STC 49 Sound Test: NOAL 19-0932 THICKNESS: 4-7/8" FIRE RESISTANCE BASED UPON: UL/cUL Design V486 and V450 ACOUSTICS: 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 STC is a rating of a material's ability to resist airborne sound transfer between 125-4000Hz, with higher ratings blocking more noise. Treatment Increased Airborne STC Wall furring, 3/ 4 in. They are logarithmic values and cannot simply be added. Construction practices have an inˆuence on final STC ratings. Floor and Ceiling Runners — (Not Shown) — Channel shaped runners, 3-5/8 in. The specified rating of 45 for field-tested assemblies (noted in Section 1206. -1/8" (total 3/8" thick), 1/4"-0. 030" P. DISCLAMER: The type of gypsum board mentioned in the construction description re˚ects the type of board used in the acoustic test reports. g. 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. government agencies. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. STC) is an integer rating of how. Description. 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 Feb 22, 2022 · general wall notes: 1. 1), contains procedures for determining STC values of concrete masonry walls The diagram and stated STC rating listed below is intended to serve as a guide. Recommended STC ratings are 50 for UBC code compliance and 60 for sensitive areas, though awareness of loud combination that will provide the required rating for the composite wall. Steel Stud Partitions. 0 psf Test: TL 68-31 NOTE: The 2 wythes of masonry were tied together with metal wall ties. deep (min), 1-1/4 Nov 29, 2024 · Common Wall Types and Associated STC Ratings Below is a list of common wall types and their estimated STC ratings that could be used as a guideline for design. they will be displayed side-by-side for easy comparison. ) Note that these code requirements only apply to multi-family construction. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. STC Rating for Underwriters Laboratories (UL) U370 Using GreenFiber FRM PM-6. 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. -1/2" (total 3/4" thick), panels caulked in place in single frame with wooden stops and glazing putty. Flanking sound patterns, the integrity of the wall, and construction methods factor in effective sound control. 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. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Doubling the mass of a wall assembly does not double the STC rating. refer to applicable codes requirements to ensure compliance prior to construction. 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 . STC ratings for walls containing doors or windows are listed in Tables 2 and 3 for most combinations occurring in offices. STC 50. Revit, CAD, and construction details for fire rated wall assemblies can be downloaded for planning and material estimation. If floor space is at a premium, adding a resilient channel or resilient isolation clips provide another decoupling option. 12 of the LABC. V. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. A wall with STC 45 will allow about 10 times more sound to Phone: 888-815-9691. Testing done with full scale assemblies by National Research Council Canada. construction team and the design team to take this into account for higher STC ratings. Globally Inspired. 875 in. 5W0. c. This includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. • 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. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. This innovative gypsum board allows for construction of high STC wall assemblies that are thinner, cost effective and more How effectively a wall or floor reduces airborne sound is measured by STC ratings , detailed separately . STC Ratings of wall assemblies INSULATED with Cellulose Spray. (STC) of Rated Partitions. SoundBook Steel Stud Partitions with Framing 16" o. 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. In addition, each assembly references a ROCKWOOL test number, as well as the ROCKWOOL products included in the tested assembly. Note: STC values are logarithmic values and cannot simply be added. 10 of the LABC) is to be used for acceptance of individual jobs only. Although guidelines related to acoustical Exterior Wall Fire Detail & Physical Data Description & Test No. Understanding STC Ratings for Drywall. S. 27 0. 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. Table 5-15 shown here gives STC ratings for different partition wall designs. Test summaries were reviewed by the submitting Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. Estimation of sound ratings for steel framed assemblies Estimated and published sound ratings for walls and floors using steel framing. Background The objective of this work was to provide sound transmission class1,2 (STC) and impact insulation class3,4 (IIC) ratings for a number of walls and floors listed in the document Area Separation Walls The systems are arranged in descending order by STC rating within each stud type category. 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. Face Brick Cavity Wall, with 2-in. 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 • Doubling the mass of a wall assembly does not double the STC rating. Flanking sound patterns, the integrity of the wall, and ˆoor and ceiling construction are important factors in e˘ective sound control. STC Ratings for Everyday Materials. STC is a method of rating airborne sound transmission performance of a wall or fl oor assembly. If there are tested assemblies at 16” o. Comments System Applications Rating Reference 1 hr. 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. The U. Seal all gaps between the walls and the floor and ceiling. Assemblies SoundBook Area Separation Fire Walls Information. 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. A partition's STC can be increased by adding mass, increasing air space, or adding absorptive material. improve STC ratings. for the most up -to -date details, including construction variations, refer to the published design. 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. There are several Modernfold Wall Systems available with STC ratings to meet most acoustical control Architects and contractors design and build assemblies that reduce sound transmission between spaces in commercial and multifamily buildings. 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, while studio-level soundproofing requires a rating of at least 45. Brick Wall, with 1/2-in. 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. For walls and partitions, the IBC does not stipulate a minimum IIC rating; however, it does require a minimum STC rating of 50 if laboratory tested or 45 if field tested. Description Cellulose STC 2x4 stud 16" OC,faced on both sides 31/2" 41 with 1/2" gypsum wall board 2x6 stud 16" OC,faced on both sides 51/2" 47 with 1/2" gypsum wall board Metal Stud Assemblies 3 5/8" metal studs 16" OCfaced on both sides with 5/8" gypsum wall 31/2" 48 board 35/8" metal studs 24" OCfaced on both sides with 5/8" gypsum wall 31/2 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. Sound Transmission Class (or . In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. The area separation wall remains intact, protecting the adjacent townhouse. Construction practices have an influence on final STC ratings. The frequencies used in STC ratings correlate in a general way with subjective impressions of and the resulting STC—heavier concrete masonry walls have higher STC ratings. 6 • 5/8 SHEETROCK® Brand FIRECODE® Core 1 hour UL Des U419 SA700 A-1 Gypsum Panels or IMPERIAL® Brand or U465 SA920 FIRECODE Core Abuse-Resistant Gypsum Base, FIBEROCK® Brand Panels – 3-5/8 25 gauge steel studs 24 o. The diagrams and stated STC ratings are intended to serve as a guide. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7 PDF. Adding batt This document discusses sound transmission class (STC) ratings for concrete masonry walls. 2. gov. Alternatively, acousti-cal performance of floor-ceiling and wall assemblies may 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. Figure 1 shows measured STC ratings for single-leaf concrete block walls from a number of published sources. All assemblies include component descriptions, STC, OITC, and R-values (if available). Alternatively, acousti-cal performance of floor-ceiling and wall assemblies may 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. —3-1/2 THERMAFIBER FS-15 blankets— face only. 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. OITC Outdoor-Indoor Transmission Class (or OITC) is a relatively new way of measuring sound transmission, an OITC rating is designed to account for sound outdoor sounds which consists of frequencies lower than an STC rating. 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/ PDF. of STC. Caution: You cannot add STC ratings. 1. , Working Stress Design Method). The STC listed is the reported value provided by the independent testing lab and report number indicated for the Another way to measure the wall’s STC is to not transmit airborne sound. and 24” o. Average weight: 81. indicates “per ”, the fire rating is based on laboratory test data of the referenced similarly constructed DISCLAMER: The type of gypsum board mentioned in the construction description re˚ects the type of board used in the acoustic test reports. USG Cavity Shaft Walls are non-load bearing gypsum board partition assemblies designed for erection from outside the shaft at each structure on the fire side of the separation wall to collapse, while the clips on the unexposed side of the separation wall continue to support the separation wall. 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 Table 1–Airborne Sound Transmission Class Ratings from Tests of Precast Concrete Assemblies. Each assembly has been assigned a unique refer- ence number through an index system. SoundBook 2. 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. More; Assembly Single Number Ratings –STC Intent: a single number rating to compare isolation of different assemblies. The results are shown in Figure 3, in terms of the percentage reduction in STC rating versus Construction Detail Description STC Test Number Rating Test Number ARL Index wt. It contains STC assemblies according to the following (Sound Transmission Class) or IIC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. 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. To achieve this rating and reduce noise transmission between rooms: Add R-11 fiberglass insulation in the cavity between the gypsum board layers. The estimate could easily be off by as much as +/- 4 dB. -1/8" (total 1/4" thick), 1/4"-0. Email: info@commercial-acoustics. Heavier concrete masonry walls have higher STC ratings due to their increased density and stiffness, which reduces sound transmission. Products 1206. Below is a list of common wall types and their estimated STC ratings that could be used as a guideline for design. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and ¿QLVKHV In the absence of test data, standard calculation methods exist, which tend to be conservative. Consult listed ˛re references for speci˛c gypsum board type and brand to obtain listed performance. Visit our website atwww. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers Transmission Class (STC) rating of a wall separating two adjacent classrooms is 50. – joints finished • optional Features and specifications are subject to change. Adding an additional layer of gypsum wallboard to each side (from two sheets to four sheets) increases the STC by about 5-6 points. well a building partition . Wd Stud—5/8 SHEETROCK Brand gypsum panels, FIRECODE Rating applicable to fire N C core, interior—1 foamed plastic and 1/2 plywd siding— exposure on interior 2 x 4 16 o. air space Brick dimensions: 2-1/4 by 3-3/4 by 8-1/4 in. 50 if laboratory tested or 45 if field tested. * Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada), respectively. Standard Amvic ICF Interior Wall2 Amvic ICF The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. They similarly measured the STC rating as the nu ber of short circuits was increased to 100 percent. 0 is an indispensable technical resource for architects and contractors seeking to achieve required Sound Transmission Class ratings on their projects. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. Here is a commonly accepted table of noise perception in walls: but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. insulation and 1/ 2 in. 1206. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. Please consult your USG representative for information. A standard wall without insulation usually has an STC rating between 30-34. Before we go any further, let’s discuss the STC ratings for everyday materials in your home. RAL-TL06-199 Recommended STC Ratings on Corridor & Demising Walls. Understanding STC ratings for drywall can be complex. Refer to the specific UL designs for assembly details. includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Limitations: abcb. o. These wall assembly files are used for planning and estimation purposes for many UL wall types, such as fire-rated wall assemblies. In the U. PDF. For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used — See Guide BXUV or BXUV7 USG SHAFT WALL SYSTEM USG Shaft Walls provide up to 4-hour fire resistance and sound ratings to 51 STC. In the absence of test data, standard calculation methods exist, which tend to be conservative. ft. Originally designed for the STC ratings cannot be simply added or subtracted. 2 Estimated values. Nonbearing Wall Rating — 1 HR. It is intended as a quick screening tool to compare different wall or fl oor assemblies. Rules of Thumb Recommended Ratings Weaknesses - What You Should Know The difference between STC and NRC STC Ratings for Various Wall Assemblies STC Ratings for Masonry Walls It contains STC (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. -1/4" (total 1/2" thick), 1/4"-0. 39/1. Contact Commercial Acoustics if you are considering options for your wall assembly, to improve your Sep 23, 2020 · Bearing Wall Rating — 1 Hr. 10). 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). STC provides an estimate of a wall's ability to block airborne sound. • 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. Revit PDF. 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. 4-in. Note (a) System has been fire tested up to 66 . In sum, STC tells you how much a ceiling or wall might stop sound. Bearing Wall Rating — 1 Hr. 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. 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. In general, a higher STC rating blocks more noise from transmitting through a partition. SoundBook SoundBreak XP Retrofit Find and download resources for STC rated wall assemblies for your construction project. Standard Method for De-termining Sound Transmission Ratings for Masonry Walls, TMS 0302 (ref. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. door or window occupying 21% of the composite wall area (21 sq. In various wall, partition, floor and ceiling assemblies, with or without fire resistance, but requiring a sound transmittance coefficient (STC) rating: † Between wood or steel stud framing faced with gypsum boards. 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. 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. - Sound transmission class (STC) ratings, with heavier walls providing higher STC ratings and hence better sound insula-tion. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition or through a wall. construction, depending on wall weight, wall construction and finishes. As discussed above, building code requires STC 50 for corridor and demising walls when building apartments and condos. 27 — Standard method for evaluating ceramic floor tile installation systems Passes cycles 1-6 C627 Light commercial Light Light Noise will travel between spaces at the weakest points. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. sanded plaster, two-coat one face STC value, the better the wall assembly is at reducing sound. Mineral Fiber Wall Boards Fire Rating: 1 hours: System STC: 4. –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. Similar to STC, the higher the OITC value, the sound transmission loss properties of a wall or roof is the sound transmission class (STC). sdjgwwx sopid kxfp ofhjb krtljr anvlve ygd pjdq alfxv usidcpg tqpahy tyeuf ibztn qosq apo