Stc rating drywall. There is a BIA Technical Note # 5A.

Stc rating drywall I'd like to see the Rw ratings for option 1 vs option 2. Aug 8, 2016 · Mass Loaded Vinyl, on the other hand, increases STCs by decoupling the drywall from the studs with a thin, flexible layer, but also adding mass to the wall, which further improves the STC (by as much as 3-4 additional layers of gypsum). Sound waves are absorbed by the wall, limiting what you hear on the other side. Measure the sound in the neighboring room: Next, proceed to the adjacent room and note the number of transferred decibels. fire-resistant gypsum core is encased in heavy, 100% recycled paper on the face and back sides and offers superior abrasion, mold, mildew and moisture resistance. In addition to information on our stc rated assemblies and stc rating wall assemblies, these videos offer valuable insights to make your soundproofing project a success. c. ) Feb 27, 2018 · Most Common Mistakes in Soundproofing – Undermining STC Ratings: Adding Drywall: Layering on additional panels of drywall is an extremely inefficient way to improve the STC of a wall. It depends on the material and the quality of the wall itself –Can increase the STC rating of a double-layer, steel-framed partition from 29 to 53 STC –An integral part of high-performance CGC partition designs for attenuation of low-frequency sound from machinery and music –Suitable for use at the perimeter of fire-rated wall assemblies MICORE® Mineral Fibre Board Jan 12, 2021 · To reiterate the above, an STC rating is a logarithmic value, similar to equations. STC rating (Sound Transmission Class rating) is a score given to a building’s surface (wall, ceiling, window, etc. Adding absorptive material (soundproofing systems) Conclusion: Determining the STC Rating of a Wall. 1+1 Drywall with Wall Blokker: 52: Apartments, Condos: X: 2: 20 Gauge Metal Stud 24in o. Mar 30, 2023 · What is the STC rating of drywall? The STC rating of walls has to do with multiple variables. Identify layer details and available products. Conference Room/Classroom 2. drywall on each side and no cavity insulation has an STC rating of 34. 5 – 1. 12 of the LABC. 875 in. Dec 5, 2024 · Using materials with high STC ratings ensures conversations remain private and disturbances are minimized. STC 45 21/ 2" (64 mm) steel studs: single layer 1/ Nov 27, 2019 · Sound Transmission Class (STC) is a rating system to measure how well building assemblies stop airborne sound from 125-4000 Hz. For a single plate stud wall, achieving the required acoustical rating of at least STC-50 will often involve using staggered studs or resilient channels on one side. Sound transmission class (STC) is the rating system used to measure a partition wall's ability to reduce the effect of airborne sound. For example, if you look at the transmission loss result graph, you can see that at a frequency of 125 HZ, the number of decibels blocked is only about 12 decibels for the STC-29 gypsum board and 18 decibels for the STC-26 steel sheet (26 GA). Whether protecting an inside room from an outside noise, or noiseproofing an inside space, acoustic drywall is for wall assemblies and spaces requiring high sound transmission class (STC) performance. In soundproofing studios we want to have an STC between 50-65. Our STC rated wall assemblies and STC ceiling assemblies are designed to provide effective soundproofing solutions for both residential and commercial spaces. Soundproof Drywall. The Masonry Society has a publication called TMS 302 Standard Method for Determining the Sound Transmission Rating for Masonry Walls. Drywall is a better solution for soundproofing than OSB. The STC rating is a lab test that does not take into consideration weak points, penetrations, or flanking paths. Jun 6, 2024 · There is soundproof drywall enhanced for soundproofing, but the STC rating is negligibly higher than a double layer of type x drywall. Ira A. Fire Rating: 1 hours: System STC: 49 System Thickness: 4. , and which can increase the STC Here you have helpful videos on how to properly install our stc rated wall assemblies and stc ceiling assemblies. com in their certifications directory. The assemblies are likewise suitable for wall furring and exterior soffit applications. Search. thick gypsum panels, with square edges, applied either horizontally or vertically. Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates airborne sound. 1-Hour Fire Rating U387 Report. Login ; Cart 0 Items View Cart. For example, a standard interior wall, meaning two sheets of ½ inch drywall separated by wood studs and no insulation, provides an STC rating of 33, which provides Jun 19, 2020 · STC Rules of Thumb – How Changing Stud Gauge and Spacing, among other factors, Improves the STC Rating of a Wall. Adding additional layers of drywall can improve the STC rating of an assembly. A higher STC rating means less sound will make its way through the partition wall – sometimes called a party wall, common wall or shared wall – creating a quieter living space. 6 days ago · The STC rating of a soundproofing product is the rating of the product alone. This ‘superpanel’ is UL fire-rated, STC-rated, shear-rated, impact-resistant, and optionally RF shielded. Double-layering drywall reduces sound transmission at a fraction of the cost of OSB panels. Flanking sound patterns, the integrity of the wall, and construction methods factor in effective sound control. ?? 5/8" Gypsum Board: 33 : AT001089: 5/8" Gypsum Board 2x4 Wood Stud 5/8" Gypsum Board KINETICS IsoMax Clips 1-1/2" Drywall Furring Channel Fiberglass Insulation 5/8" Gypsum Board: 46 : Wall Retrofit: AT001054: 5/8" Gypsum Board 2x4 Wood Stud 5/8" Gypsum Board KINETICS IsoMax Clips 1-1/2" Drywall Furring Channel Fiberglass Insulation 2 Layers of 5 on the STC rating desired. ) based on its ability to reduce sound coming through it. 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. Fire Rating: 1 hours: System STC: 53 System Thickness: 7. The standardized STC rating accounts for airborne sound measured between 125 Hz and 4000 Hz. Sheetrock® Brand Acoustical Sealant is excellent for fire-rated partitions and acceptable for use at the perimeter of wall assemblies rated 1-3 hours. long Type W coarse thread gypsum panel steel screws spaced a max 8 in. ONE OF THE MOST EFFICIENT LOW-COST METHODS OF REDUCING SOUND TRANSMISSION IN WOOD OR STEEL-FRAMED PARTITION OR CEILING ASSEMBLIES. This rating system is called STC, sound transmission classification. Since an STC-70 rating is rarely required in a normal residential scenario, there are few examples available that provide detailed guidance. Standard Method for Determining Sound Transmission Ratings How effectively a wall or floor reduces airborne sound is measured by STC ratings , detailed separately . Department of Housing and Urban Development offers resources and information on housing programs, policies, and assistance for individuals and communities. 0 is an indispensable technical resource for architects and contractors seeking to achieve required Sound Transmission Class ratings on their projects. Our SOUNDSTOP® wall design is U387, details can be found on www. For example, a standard interior wall, meaning two sheets of ½ inch drywall separated by wood studs and no insulation, provides an STC rating of 33, which provides Noise-reducing drywall products are rated on transmission loss, or the number of decibels that are blocked by a wall. A typical wall with two half-inch sheets of drywall with no insulation between might have an STC rating of 33. That’s why an acoustically dead material with a good STC rating is required. While the performance might be better in the high frequency bands, the overall rating (STC or Rw) will be controlled by the low frequency performance. May 16, 2022 · A typical interior wall with ½” of drywall on either side will have an STC (sound transmission class) rating of 34 on its own, which means that it reduces the level of noise by 34dB. It’s calculated based on how much sound is reduced across various frequencies, averaged into a single number. 5” Acoustics Assembly Number: ISS-22 STC: 50Report No. Jul 11, 2022 · This means we cannot solely rely on STC ratings when evaluating how soundproof a wall may be. (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 . Features and specifications are subject to change. All ratings are dependent on the design of each construction project and are impacted by integrated components. The standard requires a minimum laboratory STC rating of 50 for party walls and floor/ceilings. %PDF-1. An introduction to key terms, strategies and noise attenuation assemblies 1. † Superior sound damping, cost-efficient material that is easily finished and decorated in the same manner as standard gypsum board. A high STC rating is better than a low one. (3 mm) mat 3/4 in . • Increasing a wall's mass improves its STC rating. Both materials have similar STC ratings and will require double layering to cancel external noise. The drywall also features a tapered edge, reducing the need for additional taping and finishing. Pros One 5/8” layer provides sound stopping results Jul 28, 2018 · STC Ratings for Walls. UL. You will be adding this product to another product, like a window or wall, which have their own STC rating. Besides adding a soundproof membrane to a wall, another method to greatly improve STC rating is to move to 25 gauge studs at 24″ on center. I thought low frequency performance escaped the calculations and therefore the ratings for Rw and especially STC. The Sound Transmission Class (STC) is a single-number rating of the effectiveness of a material or construction assembly to attenuate the transmission of airborne sound. PABCO® Gypsum cannot guarantee actual STC ratings. Double sheetrock soundproofing is best when you are converting a room into an entertainment center, theater, voice booth, or recording studio. Mass is commonly added to existing walls by adding additional layers of gypsum. Feb 16, 2024 · To achieve an STC-70 rating the new wall may be a total of 12″ wide, depending upon the final configuration needed. Sep 23, 2024 · Typical STC Ratings for Common Materials. Insulation will noticeably improve the STC rating of an assembly. Area Separation Wall Systems Area Separation Wall Submittal Sheet SA925 WB2129 SHEETROCK Shaft Wall Systems –Tested systems achieve up to 58 STC –Have achieved up to 4-hr. STC Ratings for Everyday Materials. When combined, you will not achieve an overall rating of 54, instead, you may see an increase in STC rating of 2 or 3 points. Table 5-15 shown here gives STC ratings for different partition wall designs. It’s a relatively straight-forward proposition to achieve an STC 50 on a 25-gauge stud wall, but if the wall requires shear strength or structural load capacity, then the gauge size and spacing become a major hindrance. QUIETROCK IN ACTION: Jan 12, 2025 · Increases the drywall’s fire resistance—doubling the sheetrock increases the STC rating of the regular drywall panel. It is an important factor in ensuring acoustic comfort in buildings. To determine a single STC for the wall system, first calculate the STC using both Equations 1 and 2, based on the combined weight of both wythes, then linearly interpolate between the two resulting STC ratings based on the relative weights of the wythes. When the mass of a barrier is doubled, the isolation quality (or STC rating) increases by approximately 5 dB, which is clearly noticeable. Have a Question About Assemblies? Call: 1-800-USG-4YOU Sound Transmission Class (STC) is an integer rating of how well a wall, partition or a roof prevents sound from traveling from one area/room to another. Below please find STC rated wall assemblies based on our acoustic lab tests and INSUL models. Feb 11, 2019 · The "STC" or Sound Transmission Class of a brick can vary based on thickness, hollow or solid, and textured finish among other things. An STC of 50 is a common building standard and blocks approximately 50 dB from transmitting through the partition. • Batt insulation must fit tight without gaps. Construction materials companies use a rating system called Sound Transmission Class levels, or STC, to determine how effective a product is at Dec 18, 2023 · Above is an example of a wall with a STC rating of 55. An STC 40 level of blocking should be considered a minimum as privacy cannot be achieved at levels below STC 40. Sheetrock® Brand Acoustical Sealant is water-based, highly elastic and easy to apply with hand-gun equipment to vertical and horizontal surfaces (even overhead) without sagging. 1): Architects and contractors design and build assemblies that reduce sound transmission between spaces in commercial and multifamily buildings. A standard wall without insulation usually has an STC rating between 30-34. 2. Roughly speaking, the STC rating equals the reduction in decibel levels across the partition or through a wall. 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. Fulton College of Engineering | Educating Global Leaders Feb 15, 2024 · A wall's STC can be increased by. If you have an STC of 60 or more, that is considered highly isolated. In general, an STC of 50 is a good target level of sound isolation for walls and ceilings. The other part of the framing assembly are the metal studs. Things like thickness and air space within the wall can have a greater impact on the rating. Sound insulation of ceilings is measured using Ceiling Attenuation Class (CAC). However, you’re also losing 2-3/4” off the perimeter of the room. Abuse resistant per ASTM C1629. back to top The acoustical performance of a wall assembly is measured using a single number rating system, where the higher the number the better the performance. Doubling up the 545 on that type of wall construction produces a quiet value of 80. Excellent sound attenuation at low cost is provided when gypsum panels are resiliently attached. As you can see, QuietRock ES outperformed the multi-layer gypsum panels for each of the STC requirements. The size and spacing of the studs, the type, thickness and amount of gypsum board or the thickness of the insulation can all be changed to affect the wall assembly’s STC rating. STC rating goes from 25 – 65. Keeping the double drywall on one side and then putting fiberglass or mineral wool insulation in the stud cavities and putty pads on the junction boxes The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. 1-866-949-9269. Revit PDF. STC values are measurements that indicate a laboratory-tested assembly. Other assemblies may be used provided that they comply with the requirements of Section 1206. Resilient channel can improve the STC rating of an assembly. drywall on one side raises the STC into the 40s. Things like the thickness and air space within the wall can improve the rating greatly. by the required layers of drywall to achieve the fire rating. 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. 11 of the LABC. BLUE RIDGE FIBERBOARD is proud to announce SOUNDSTOP® is now UL certified for the 1-hour fire rating in a load bearing wall system when installed behind drywall. to have Sound Transmission Class (STC) ratings and Impact Insulation Class (IIC) ratings of 50 as shown. There is a BIA Technical Note # 5A. The intent is to categorize the relative performance of an assembly in impeding or attenuating sound energy as it passes through the […] Steel Framing STC Values Sound Control 21/2" (64 mm) Steel Studs 35/8" (92 mm) Steel Studs STC 52 21/ 2" (64 mm) steel studs: double layer 1/ 2" (13 mm) Type X gypsum board one side, single layer other side; one thickness 23/ 4" (70 mm) JM Formaldehyde-free thermal/acoustical fiber glass batts. The diagrams and stated STC ratings are intended to serve as a guide. STC Rated Wall Assemblies Target Sound Transmission Classification (STC) Ratings are the recommended partition STC that will provide acceptable privacy and sound attenuation between spaces. Ceilings should be used for sound absorption and not for blocking sound between rooms. Cavity Absorption: Sound-absorbing insulation (fiberglass or mineral wool) can boost a wall assembly’s STC rating. Determine Target STCs. Menu. Contact; 1-866-949-9269 National Gypsum Company has published the industry’s most comprehensive guide for sound-rated assemblies. The Basics of STC Ratings. Calculate What You Need for the Improvements You Want. The initial specification for the STC 45 wall design called for 3 layers of Type X gypsum board and the STC 50 wall was originally designed using 4 layers of Type X gypsum panels. The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. High-insulating wall products, as measured by Sound Transmission Class (STC), should be used to for blocking noise at an STC 45 or higher. Jan 7, 2020 · What is the STC rating of 5/8 drywall? Typical existing wall construction (the most common method is wood stud construction with insulation and 5/8” drywall on both sides) has an STC rating of 30 to 34. The SoundBook® is the industry’s leading resource for technical details and sound-rated assembly drawings – all in one place. 4. The STC of 55 is achieved by using a double layer of 5/8″ drywall on each side and rockwool insulation inside the wall cavity. This innovative gypsum board allows for construction of high STC wall assemblies that are thinner, cost effective and more reliable than traditional methods for constructing these types of Phone: 888-815-9691. ME ASF Exterior Wall Intersection ; ME ASF Protruding Exterior Wall ; ME ASF Typical Floor Ceiling Juncture ; ME ASF Preserving Fire Rating in Attic Area with M Bloc Ekcel Battens ; ME ASF Preserving Fire Rating in Attic Area with Fiberglass Insulation ; ME ASF Passing By Truss ; ME ASF Laminating Drywall Screw Pattern ; ME ASF 2 Ft Starter Wall Ideal for interior walls in hotels, restaurants, hospitals, schools and even in home theatres, music rooms, and bedrooms. It helps calculate the STC of a wall. It is rated as a Type X fire-resistant product, providing additional protection in case of fire. Installing insulation within a wall or floor/ceiling cavity will improve the STC rating by about 4-6 dB, which is clearly noticeable. Mass: An extra layer of gypsum board on one or both sides of a wall assembly will increase the STC rating. Q: How can I improve the STC rating of a wall? A: To improve the STC rating of a wall, you can use soundproofing materials such as acoustic insulation, mass-loaded vinyl, and resilient channels. For example, a wall may have an STC rating of 34 and a single sheet of drywall may have a rating of 20. • Doubling the mass of a wall assembly does not double the STC rating. Standard Single-Layer Drywall - STC rating between 30 and 35; Stud Wall with Insulation - STC rating between 40 and 45; Soundproofing Drywall - STC rating between 45 and 50; 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 on wood framing. S. STC 55-65 – Most noises inaudible. This acoustically enhanced, fire-resistant gypsum core is encased in heavy, 100% recycled paper on the face and back sides and offers superior abrasion, mold, mildew and moisture resistance. 3. 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. A reduction of 10 STC levels results in an apparent sound reduction of 50% STC values are further improved by using Johns Manville sound control batts to increase sound absorption within the floor/ceiling assembly. Achieves best possible score of 10 for mold resistance per ASTM D3273. 5 %µµµµ 1 0 obj >>> endobj 2 0 obj > endobj 3 0 obj >/XObject >/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 18 0 R 19 0 R] /MediaBox[ 0 0 612 792 Oct 24, 2017 · required an STC of 50. Address: 6301 N Florida Ave Tampa, FL 33604. OC, with last 2 screws 1 and 4 in. For a continuous A basic wall assembly consists of wood or metal studs, insulation, fasteners (screws or nails) and gypsum board. Q: How is the STC rating calculated? A: The STC rating is calculated using a formula that takes into account the sound transmission loss (STL) of the wall or partition This technique is also used when you are installing drywall on to Whisper Clips and Hat Channel, just make sure to screw into the channel in place of the joists. One of the ultimate trade-offs in wall design is structural load versus STC ratings. 6. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 4 days ago · 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. Fiberglass and mineral wool insulation contribute the biggest 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. (19 mm) 3 For example, a thick concrete wall will block more sound than a thin gypsum/2x4 wall. 1+1 Drywall + Wall Blokker Lite: 52: Apartments, Condos: 2 resistance. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. Decoupling the wall with a double-thick stud wall and 545 takes the value to 75. Doubling the mass of a wall assembly does not automatically double the STC rating. Mar 6, 2018 · If you do not have wall height constraints, then simply moving to 25-gauge studs at 24 inches on center will improve the STC of your wall by 5-7 points or more! Furthermore, this reduces material cost by using thinner metal studs and using fewer of them (50% fewer if moving from 16 inches on center). Traditional drywall typically has an STC rating of 30-34, but when paired with soundproofing techniques or materials, this rating can increase to 50 or In general, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. May 2, 2022 · What Is STC? Before we can go over the comparison of QuietRock to regular drywall we need to understand STC ratings. Jan 16, 2025 · A standard 2×4 wood-framed wall with 1/2-in. Adding mass. Since the drywall is rigidly connected via drywall screws and direct contact, the sound travel directly through the gypsum board itself. STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. While STCs are a good one-number approximation for the soundproofing capacity of a wall, they are limited in a few ways: STCs are an average of the transmission loss (dB Loss) in a number of frequencies. Email: info@commercial-acoustics. 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 key advantage of drywall is the cost. at SOUND TRANSMISSION CLASS RATINGS. The STC provides an indication of how loud transmitted sound is perceived to be by the listener. SoundBook 2. 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. But dry walls have resonance issues. Moving to double 5/8-in. 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 STC Rating What You Can Hear Typical Application; 25-30: Normal speech easily understood: Single panel of drywall: 40-45: Loud speech audible but not intelligible: Standard wall construction: 50-60: Very loud sounds barely heard: Premium soundproofing: 60+ Most sounds inaudible: Recording studios Find Revit and CAD files for STC and fire rated UL assemblies. They may be used to meet the acoustically rated construction requirements stipulated in Sections 1206. Lab-certified STC-rated up to 62 Single and double-leg channels RC Deluxe® has extra-wide screw surface for easy attachment Available in 12’ lengths ClarkDietrich resilient channel is one of the most efficient low-cost methods developed to reduce transmission of 6 days ago · Drywall with average thickness has an STC of around 36 in the USA. The Role of Drywall in Achieving High STC Ratings 1. Ratings must be determined in accordance with CAN/ULC-S101-14, “Fire Endurance Oct 3, 2024 · Normally, a 1/2″ sheet of drywall weighs around 1. What does STC 55 mean? STC 45-55 – Normal conversation can’t be heard. Gypsum Board Gold Bond® BRAND SoundBreak XP Gypsum Board is an acoustically enhanced gypsum board used in the construction of high STC wall assemblies. All of these options meet the typical STC rating requirement in the building code of 50; however, additional measures are required to bring the STC rating up to 60 for more stringent requirements. The STC is measured by Transmission loss of the loudness of the sound (in dB) and at various frequencies. 1-Hour Fire Rating U387 Design Wall Assembly Description: STC Rating: Application: Metal Stud: Wood Stud: Total Drywall Layers: 2×4 Wood Stud 1+1 Drywall with Wall Blokker: 41: Residential: X: 2: 25 Gauge Metal Stud 16in o. For example, a wall made of brick or concrete will generally have a higher STC rating than one made of drywall or wood. 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+. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. 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 Nov 7, 2016 · This means that all apartments, condos, and other multi-family developments require an STC 50 rating in the wall! However, as is often seen during field STC testing, this rarely occurs. There’s a handful of other soundproofing products offering greater STC ratings than standard drywall. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations (see ASTM International Classification E413 and E90). RAL-TL90-186 Insulation Included: ROCKWOOL Jun 19, 2020 · STC Improvements and Corresponding Costs – In most wall assemblies, the addition of a soundproof membrane will be much more cost effective for improving STC rating than adding multiple layers of drywall to a partition. Equation 2 is the STC equation for clay masonry (ref. Before we go any further, let’s discuss the STC ratings for everyday materials in your home. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. heavier concrete masonry walls have higher STC ratings. The STC Score of Drywall X 5/8″ Thickness In the same wall assembly of the QuietRock, a double type X 5/8″ drywall with 3-1/2″ of insulation, green glue between the drywall layers, and steel studs on a Aug 30, 2023 · Six variables to consider for optimal STC ratings. Visit UL U305 on the UL website Layer 1 - Gypsum Panel: 1 layer What is the STC rating of drywall? In this instance, the STC rating of drywall has to do with multiple variables. Can you afford to give up the extra space? Typical Wall Assembly for an STC-70 Rating. STC stands for Sound Transfer Coefficient and it is a measurement of the amount of sound that can transfer through a wall, floor, door, window or ceiling. Construction practices have an influence on final STC ratings. back to top Jan 20, 2022 · Learn how to determine the STC rating of a wall. In the examples below (figures 6 and 7 in The SoundBook), going from an uninsulated wall to an insulated wall boosts the STC rating 8 points. Staggered or double stud walls are higher rated than single stud walls. The target ratings are dependent on the adjacency and occupancy class on each side of the wall – a band room may not need a high STC wall if placed next Many components of firewalls and fire separations are helpful in hindering sound transmission between dwelling units. Feb 13, 2023 · To determine the STC rating of a wall, drywall, or window, there are several factors to consider: Material: The type of material used in the construction of the wall, drywall, or window can significantly impact its STC rating. Mar 5, 2021 · The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. STC 49: Single layer of 5⁄8”(16 mm) gypsum drywall on each side of 3 5⁄8” (92 mm) steel stud with 2”(51 mm) MinWool SAFB STC 51: Single layer of 5⁄8”(16 mm) gypsum drywall on each side of 3 5⁄8” (92 mm) steel stud with 3”(76 mm) MinWool SAFB STC 52: Double layer of ½” (13 mm) gypsum drywall on each side Acoustic standards, guidelines and building rating systems occasionally permit an STC rating as low as 40. Gypsum panels fastened to framing with 1-1/4 in. High STC ratings with fewer layers of gypsum board than traditional assemblies. 5. Entertainment Room/Music Room Sound Control is an important design consideration for both commercial and multi-family projects. Also designed for wood-frame construction are USG Area Separation Fire Walls/Party Walls fire-rated gypsum drywall assemblies for multi-family These STC ratings represent common wall and door assemblies. You can use the preceding table as a guide for choosing materials based on the required degree of sound control. It should be noted that STC ratings obtained in a lab may be different than those achieved in real-world applications. A typical interior wall has a single layer of 1/2-inch drywall on each side with no insulation inside with an STC rating of 33. Use it for high-rated Sound Transmission Class (STC) wall and ceiling assemblies, where sound transmission between rooms or dwelling units is a concern. No products in the cart. • 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. • May 6, 2024 · As a result, be sure to check the STC rating for all components, such as windows and doors that will be installed in the wall assembly. Nov 8, 2023 · Where control joints occur in acoustical or fire-rated partitions, special consideration should be paid to the control joint materials to ensure the continuity of the fire or STC rating. STC is used to evaluate interior walls, ceilings, floors, doors, windows and exterior wall configurations where sound transmission is important. If you don’t see the STC Rated Wall Assembly you need below, contact one of our acoustical engineers with the desired The U. For example, a thick concrete wall will block more sound than a thin gypsum/2x4 wall. These include brand, manufacturing process, the raw material mixture used in production, auxiliary materials and more. 6 lb/ft2 (pounds per square foot). Oct 20, 2024 · A higher STC rating indicates better soundproofing performance. Some might deliver better results and fall within your project budget; others seem to cost a fortune and may not be realistic for your project. The STC value Sep 23, 2020 · Gypsum Board* — (As an alternate to Items 2, 2A, 2B and 2C) — 5/8 in. With years of experience and expertise in the field of soundproofing, we have developed a range of STC rated assemblies and techniques to help you achieve the best possible sound Dec 30, 2022 · How Is a Wall’s STC Rating Calculated? STC rating can be determined by employing the following STC calculation formula: Use an audiometer to record the decibel levels in the room containing the noise source. Some are UL tested and ASTM rated. Aug 9, 2017 · A ULC Listing showing that the sound-insulating assemblies specified in the Sound transmission class (STC) rating table meet the Code’s fire-rating requirements is required in buildings where the NBC 2015 requires a fire-resistance rating for wall assemblies. Sound Control For A Purpose Just like many other characteristics of a structure that can be optimized for the benefit of its occupants, better Sound Transmission Class (STC) is a measure for rating the performance of a wall system as a barrier to airborne sound transmission between adjacent closed spaces such as offices. To properly specify the amount of sound control desired in a floor/ceiling assembly, an architect should consider both the STC value and IIC rating. Nov 7, 2016 · STC Wall Rating Chart. Note: Improving the STC rating of a wall will probably not affect the reverberation or reflections within the space. In some stiff walls (single wood stud), a combination of approaches may make sense. Lab tests are performed at NVLAP-certified laboratories in accordance with ASTM E90 and ASTM E492. See the Gypsum Association publication, GA-234-2019 Control Joints for Fire-Resistance Rated Systems to achieve 1- and 2-hour fire ratings for both wood and These wall assembly files are used for planning and estimation purposes for many UL wall types, such as fire-rated wall assemblies. Jan 6, 2025 · Discover the 10 most-asked construction questions, including fire-rated assemblies, gypsum board finishes, STC ratings, and mold-resistant drywall solutions. You cannot simply add two STC ratings together because of the logarithmic scale of decibels. While condos are typically over-designed to ensure that STC 50 is reached and exceeded due to the significant litigation in the condo market, apartments are May 19, 2023 · Adding more insulation can have a profound effect on a wall assembly’s STC rating because it adds sound-absorbing material to the assembly. This product is well suited to renovations where there are existing walls. When added to drywall, the STC rating goes up significantly, making the wall soundproof. CAD/Revit & Acoustics. 6 %âãÏÓ 135 0 obj > endobj 178 0 obj >/Encrypt 136 0 R/Filter/FlateDecode/ID[086BB7CC27A642658C55E48DEB399F26>]/Index[135 102]/Info 134 0 R/Length 163/Prev Aug 16, 2019 · QuietRock 545 on a single stud wall has an STC rating of 56. 1lb per square foot MLV has an STC rating of around 26. An alternative, used for various reasons, is a double-stud wall. With this in mind, you can add sound insulation materials such as the following: Sound Damp2 is a roll-applied drywall damping compound that is designed to be applied between two layers of drywall to improve the STC rating of a stud wall. Increasing Air Space. 1. Select materials for sound absorption according to their STC ratings. However, most require blocking levels of STC 45 or higher 1. Walls. Sep 10, 2023 · STC Ratings for Drywall. This is considering that there are no additional insulation materials being used, such as Rockwool, Fiberglass, Green Glue, etc. ) reduces airborne sound transmission. SilentFX QuickCut offers exceptional noise control, making it an ideal choice for spaces where sound reduction is a priority. 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. † Use of SoundBreak XP Gypsum Board results in wall partitions with high rated STC values that are thinner than traditionally built high rated STC wall partitions providing increased usable floor space. By doubling the drywall and adding some batt insulation, the STC rating is improved to 44. QuietRock® 530 Benefits • Delivers STC ratings of 52-74 • Fire rating equivalent to Type X drywall; UL fire-rated • Shear-rated (average 487 lbs/ft) • Hangs and finishes like standard drywall Oct 2, 2024 · A: The STC rating is used to assess the effectiveness of a wall or partition in reducing sound transmission. This is a demising wall between hotel rooms or between the rooms and a hallway. Adding batt insulation can increase this to around 39, while incorporating resilient channels could push the rating above 50. fire-resistance ratings with multi-layer designs (UL U415) –Oscillation tested to 1 million cycles to ensure structural performance May 19, 2023 · Adding more insulation can have a profound effect on a wall assembly’s STC rating because it adds sound-absorbing material to the assembly. An assembly can increase its STC rating by doubling up on gypsum board layers on each side, installing extra fiberglass insulation in the wall cavity and including an air space, which helps eliminate structure-borne noise. STC is the wall equivalent of CAC. Download the Acoustics Overview and sound assemblies to learn more. An STC of 25 is considered bad and an STC of 50 and above is usually a good place to start with soundproofing. If the STC rating of any material is high, the soundproof capability of that material is also high. STC ratings are pretty straightforward. Metal stud walls perform better than wood stud walls. The field test however, does evaluate the entire assembly and includes all sound paths. Results: A standard 2 x 4 wall 16" OC with 1 layer of drywall on each side has an STC rating of approximately 32. M2Tech paper provides additional zone of protection against moisture and mold. Sound Transmission Class (STC) measures the reduction in sound decibels (dB) transmitted through walls and ceilings. Revit, CAD, and construction details for fire rated wall assemblies can be downloaded for planning and material estimation. First, select the hourly rating needed; Second, choose the type of design you are seeking (example – Walls/Partitions (steel framed), Floor/Ceiling (wood framed), etc. Others, not so much. 10 and 1206. Feb 20, 2025 · For instance, a basic interior wall with 1/2" drywall on both sides of a wood frame may achieve an STC rating of 33. Fiberglass and mineral wool insulation contribute the biggest Mar 30, 2023 · What is the STC rating of drywall? The STC rating of walls has to do with multiple variables. from edge of board or nailed as STC Rated Wall Assemblies. Standard vs. May 22, 2022 · A standard wall will have an STC rating of 35-45. STC is a rating that measures how well a building partition (like a wall or floor) reduces sound transmission. Options to achieve this rating include providing a drywall ceiling Sep 17, 2018 · Understanding Transmission Loss Results. Use it for high-rated Sound Transmission Class (STC) rated wall and ceiling assemblies, where sound transmission between rooms or dwelling units is a concern. So, according to the STC rating, drywall will not be able to block complete sound transfer from any area. Oct 21, 2013 · So, for example, a 50 dB noise on the other side of an STC 35 wall will sound like a 15 dB noise to the average listener (see our Table of STC ratings and noise reduction left). These materials help to absorb and block sound transmission. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. Calculating the required improvement involves subtracting the target STC rating from the existing STC rating. However, occupants could still be subject to awareness, if not understanding, of loud speech. STC value, the better the wall assembly is at reducing sound. com. 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 The lowest STC numbers you see are around 33. Sound Transmission Class (STC) measures how well a material or barrier (wall, ceiling, etc. (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. 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. Walls and floors in the field often measure lower than in laboratory ratings due to variations in workmanship as well as leaks and bypasses. Similar to STC, the higher the OITC value, the Find and download resources for STC rated wall assemblies for your construction project. And keep reading to learn about Outdoor-Indoor Transmission Class, which takes transportation noises into account for building materials used on exterior assemblies. CAD/Revit & Acoustics Sheetrock® Gypsum Panel (UL Type SCX) Sheetrock® Brand Firecode® X SilentFX QuickCut systems improve sound attenuation with STC ratings of 50 and higher. STC Ratings & Steel Stud Framed Walls . The estimate could easily be off by as much as +/- 4 dB. skuhwv dhaw tcboqa jqksii exaff fnnyh xctkl kiyt yucl btqw aqlfg hhqa zqgu zddh gvqwa