Stc wall rating calculator. J2247-13-303-11-R0 Insulation Included .

Stc wall rating calculator PDF. (STC) is the mass per unit area: the higher it is, the better. a wall or floor, and is usually classified in terms of Sound Transmission Class (STC). · Tampa, Florida 33634 · 888-815-9691 PDF-1. Noise will travel between spaces at the weakest points. This is where the Sound Transmission Class (STC) rating comes into play. Mar 5, 2021 · Below, we explore the data gathered, analysis performed, and underlying ASTM specifications used to calculate STC, IIC, and delta-IIC ratings. 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. So give them the ratings for the wall assembly you've chosen, the windows and doors. Figure 1 shows measured STC ratings for single-leaf concrete block walls from a number of published sources. Contact Commercial Acoustics if you are considering options for your wall assembly, to improve your In the context of masonry partition walls, the Sound Transmission Class (STC) rating provides an estimate of the wall’s acoustic performance in various typical airborne sound insulation applications. However, higher ratings may be necessary for areas with more demanding sound isolation requirements. Frequency is the number of waveforms per second and is measured in Hertz (Hz). The higher the STC rating, the better the sound STC 50 to 65 - STC ratings of 50 or higher are more common in commercial settings, like hotels or professional sound studios, as well as exterior residential walls. *OITC is estimate d base d on this test. An STC calculator can show you that 25 gauge studs perform better than 20 gauge, which are better than wood stud walls. Filter ProSTUD wall systems by: Wall design; Wall assembly; limiting heights; STC sound ratings; UL fire protection; In addition, iProSTUD 2. Phone: 888-815-9691. Table 2 is calculated on the basis of a 3x7−ft. The higher the STC rating, the more effective that material is at reducing sound transmission of the most common frequencies. Many times the lab test STC rating is much higher than the field STC due to installation errors in the field. Address: 6301 N Florida Ave Tampa, FL 33604 How the STC Wall Calculator Works. This is the measure of how much sound energy is lost as it passes through a barrier, such as a door or wall. 1+1 Drywall with Wall Blokker: 52: Apartments, Condos: X: 2: 20 Gauge Metal Stud 24in o. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. STC – Sound Transmission Classification. The latter will provide approximately 12 dB more sound blocking performance” Source: Construction Specifier, Author Mr. Metal stud walls perform better than wood stud walls. Kevin Herreman Owens Corning . The STC (Sound Transmission Class) rating is a single-num ber rating system for interio r build ing partitions and viewin g windows used to catego rize acoustic performanc e. of Jan 28, 2025 · This article explores STC ratings, their calculation, and their application in commercial environments. These materials help to absorb and block sound transmission. 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. 4 %âãÏÓ 9 0 obj > endobj 11 0 obj > endobj 23 0 obj > endobj 29 0 obj >stream /Figure >BDC q 1 i . Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. Higher STC values are more efficient in reducing sound transmission. STC stands for sound transmission classification. 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. What Are STC Ratings and Why Do They Matter? Definition of STC Ratings. Since an STC-70 rating is rarely required in a normal residential scenario, there are few examples available that provide detailed guidance. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. Address: 6301 N Florida Ave Tampa, FL 33604 includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. STC Ratings for Everyday Materials. Increasing the STC of your walls might help. Sound Transmission Class (STC) Calculator Sound Transmission Class (STC) Calculator Select Wall Type: Wood Stud WallConcrete Block WallBrick WallDrywall Partition Wall Thickness (inches): Calculate STC Rating STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. 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. STC is a standardized measure that rates how effectively a building partition, such as a wall or floor, can block airborne sound. Certain places, such as recording studios or residential areas, have specific requirements that affect the ideal STC rating. Users can enter the calculated noise level related to a specific Noise Assessment Location in front of a building façade and STraCAT will generate a target required attenuation value for Insulation will noticeably improve the STC rating of an assembly. STC 30-40: Loud speech can be heard, but not entirely clear. Alternatively, acousti-cal performance of floor-ceiling and wall assemblies may includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. S. Acoustical Calculator Instructions To see the projected acoustical and fire performance profiles of a given application of Owens Corning insulation products, just answer these questions and click on Find Assemblies . If floor space is at a premium, adding a resilient channel or resilient isolation clips provide another decoupling option. Address: 6301 N Florida Ave Tampa, FL 33604 The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. Calculation Example: The Sound Transmission Class (STC) rating is a measure of how well a partition or other building element blocks sound. The consid­ Phone: 888-815-9691. Feb 15, 2024 · How can you improve the wall's STC? A wall's STC can be increased by. E413-87 in an acoustica l wall. Increasing Air Space. Stud Spacing 16 in. STC 43* 15/ 8" (41 mm) steel studs: single layer 5/ 8" (16 mm) Type X gypsum board each side; one thickness 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. 6. Calculation Example: The sound transmission class (STC) rating is a measure of how well a wall or partition blocks sound transmission. 4. Can you afford to give up the extra space? Typical Wall Assembly for an STC-70 Rating. The higher the STC rating, the better the material prevents sound from passing through. The STC is measured by Transmission loss of the loudness of the sound (in dB) and at various frequencies. g. 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. 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. It's free to sign up and bid on jobs. Calculation Example: The Sound Transmission Class (STC) rating is a measure of how well a material or assembly blocks sound transmission. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. This is a UL U419 wall, so its STC rating is 50. 6122 Benjamin Rd. Measure the sound in the neighboring room: Next, proceed to the adjacent room and note the number of transferred decibels. Address: 6301 N Florida Ave Tampa, FL 33604 Double layer of 1/2″ drywall on each side + staggered wood stud wall + batt insulation in wall: 55: Double layer of 1/2″ drywall on each side + wood stud wall on resilient channels on one side + batt insulation: 59: Double layer of 1/2″ drywall on each side, on double wood/metal stud walls spaced 1″ apart + double batt insulation: 63 Find and download resources for STC rated wall assemblies for your construction project. The higher the STC rating, the more effective the assembly is at shielding occupants from noise originating in neighboring spaces. Use the tabs underneath the results to navigate to the detailed assembly descriptions and to change the assemblies according to your needs. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. From this calculation, an STC value is determined. Standard Method for Determining Dec 18, 2023 · Above is another example of a factory wall. Caution: You cannot add STC ratings. The STC rating system looks at the amount of noise mitigation provided by the assembly over a broad range of frequencies and a single number is calculated as its rating. 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 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 combination that will provide the required rating for the composite wall. 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. Calculate the target STC rating for the area based on acoustic needs and functions. 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 A Sound Transmission Class or STC rating provides a rough estimate of the reduction in sound level across a wall from one space into another. Oct 21, 2023 · If you are unsure of what rating would work for your project, there are some standards you can go by in helping you to determine your target range. 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/ and the resulting STC—heavier concrete masonry walls have higher STC ratings. May 13, 2022 · The higher the STC rating, the less noise is transmitted from the assembly. 1+1 Drywall + Wall Blokker Lite: 52: Apartments, Condos: 2 Calculating the STC Rating: The STC rating is calculated from a curve-fitting procedure defined by ASTM E413. For instance, if you have an STC of 40 on one wall and decide to add another wall with an STC of 20, the STC of both walls combined will not be 60. NIC […] 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. Search for jobs related to Stc wall rating calculator or hire on the world's largest freelancing marketplace with 24m+ jobs. The ASTC rating of the complete building system and the STC and Flanking STC ratings of the separating and flanking assemblies are displayed at the top of the page. ft. The calculation of STC ratings begins with a foundational concept in acoustics: Transmission Loss (TL). It has a 5/8″ type-x gypsum board on both sides, sound batt insulation and is made using 6″ metal studs. Email: info@commercial-acoustics. 2. Explanation. Acoustic Calculator: Calculate the Reverberation Time of your space based on geometry and finishes, and determine how much absorption you need in your space. Adding additional layers of drywall can improve the STC rating of an assembly. Visit our website atwww. 10). The higher the STC value, the better a construction reduces the transmission of sound. In any case, 65 is the highest possible soundproofing rating, but you will rarely see this kind of rating for an interior wall. Download the Acoustics Overview and sound assemblies to learn more. 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. Understanding STC ratings for drywall can be complex. com. 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. Materials Calculator Product Sustainability Project Profiles 1-800-NATIONAL Submittal Builder Contact. There is no reason to spend money or effort to improve the walls until all the weak points are controlled. STC ratings commonly range between 30 to 75+ and are largely dependant on the type of materials used in the assembly and the care taken in construction. Dec 31, 2024 · How STC Ratings Are Calculated. Walls. 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. The final STC rating of a room is a composite, not an individual component calculation Mar 9, 2022 · What are NR, NIC & STC? The overall air-borne sound isolation between two adjacent spaces is measured by the NR (Noise Reduction) between the spaces, and is rated by the single number NIC value (Noise Isolation Class). 3. The standard requires a minimum laboratory STC rating of 50 for party walls and floor/ceilings. –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 Mar 30, 2023 · Also, an acceptable STC rating for walls may be different from the acceptable STC rating for floors, depending on whether the walls are shared by a neighbor, or a room is directly beneath a kitchen with heavy traffic. 50 if laboratory tested or 45 if field tested. You can’t add STC ratings together. The U. 1. An STC 50 Class (STC) rating. 0 provides direct links to UL design reports, third-party STC sound tests and SubmittalPro®, where contractors can view technical data sheets and generate submittals. It is used to evaluate the acoustic Architects and contractors design and build assemblies that reduce sound transmission between spaces in commercial and multifamily buildings. 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. Feb 27, 2018 · Use an STC calculator that predicts ratings based on standard rules of thumb and underlying lab test data. Non-Rated Options SCIF Mold Resistance Steel Stud Mil Thickness 15 mil STC Ratings & Steel Stud Framed Walls . J2247-13-303-11-R0 Insulation Included Mar 6, 2018 · Phone: 888-815-9691. 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. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound Acoustical Calculator Instructions To see the projected acoustical and fire performance profiles of a given application of Owens Corning insulation products, just answer these questions and click on Find Assemblies . 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 Phone: 888-815-9691. STC Calculator: Calculate the STC of your partition based on stud type, size, spacing, and drywall/insulation layers. 5. With this knowledge, you can design your… (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. To determine an STC rating, a sound transmitter and a receiver are set up on either side of the assembly or material being tested. This STC Wall Calculator estimates the Sound Transmission Class (STC) rating of a wall assembly based on various materials and configurations. Wall Stud Config Single Staggered Double Stud Thickness 3 5/8th in. Jun 15, 2024 · The STC ratings for windows and glass can range from 18 to 65, depending on the type and thickness of the glass. jm. 751 614 -426. Consult listed ˛re references for speci˛c gypsum board type and brand to obtain listed performance. The average STC rating for a regular single-pane window is 27, while double-glazed windows have an average rating of 29. • Doubling the mass of a wall assembly does not double the STC rating. The higher the STC rating, the better the material sound transmission loss properties of a wall or roof is the sound transmission class (STC). Based upon the data and methodologies compiled in American Wood Council’s Technical Report No. A Sound Transmission Class or STC rating provides a rough estimate of the reduction in sound level across a wall from one space into another. Sound Transmission Class (STC) is a numerical rating used to quantify the sound insulation properties of materials. Glass siz e and glazing system will a˜ect STC 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. Sep 17, 2018 · Results are compared to a standard STC reference curve. c. . However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. The STC rating is a crucial measure of how effectively a building partition attenuates airborne sound, making it essential for creating soundproof spaces. As discussed above, building code requires STC 50 for corridor and demising walls when building apartments and condos. 24 in. door or window occupying 21% of the composite wall area (21 sq. STC ratings for walls containing doors or windows are listed in Tables 2 and 3 for most combinations occurring in offices. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. Elevating the STC rating of a given space can dramatically enhance both comfort and usability. 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 The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. Mar 29, 2018 · If your walls offer 33 STC but your meter goes up to 50 when your neighbor watches TV with the volume turned loud, then the difference is passing through your walls. This calculator provides the calculation of sound transmission class (STC) rating for a double-partition wall system. Q: What is a good STC rating for residential walls? A: For residential walls, an STC rating of 50 or higher is typically recommended to provide effective soundproofing. However, soundproof windows can have an STC rating of 48-54 or higher, providing significantly better sound includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. 4 in. The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. Resilient channel can improve the STC rating of an assembly. STC 50-60: Sound is barely heard, providing solid privacy. Sep 23, 2024 · Here’s what different STC ratings mean for your soundproofing needs: STC 25-30: Normal speech can be heard clearly through the barrier. Aug 30, 2023 · The STC rating is tested in accordance with ASTM E90: “Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements ” and scores how well a wall assembly mitigates airborne noise between spaces. Unlike traditional Mass Loaded Vinyl, Wall Blokker was developed in the automotive industry to provide superior soundproofing performance with long life-cycles and without off-gassing and other degrading processes. 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. Adding mass. The higher the STC rating, the better the soundproofing performance. 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. A reference contour is fit to the 1/3 octave-band Sound Transmission Loss (STL or TL) values with a maximum of 32 deficiencies overall or 8 in any single 1/3 octave band. 501 re 306 396. Here are several methods to achieve this: Oct 20, 2024 · This calculator provides the calculation of Sound Transmission Loss (STL) for a given Sound Transmission Class (STC) rating and frequency. STC is the wall equivalent of CAC. Climate zone-appropriate insulated wall assembly solutions that are easily comparable with national and provincial energy efficiency prescriptive provisions. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 • Acoustic Properties: Minimum STC 26 per ASTM E 90-02 • Flammability rating: Class 1 per ASTM E 84 • Mold & Mildew: No fungal or algae growth per ASTM D3273 and ASTM G 21. eLearning Build your expertise with online courses, workshops, and training on wood construction, standards, and best practices. J2247-13-303-11-R0 Insulation Included significantly improve an IIC rating. In general, the higher the STC rating of a material or product, the more effective it is in reducing and blocking out sound at frequencies most commonly encountered Oct 20, 2024 · A higher STC rating indicates better soundproofing performance. While neither of these materials is useful for absorbing acoustics with a high degree of accuracy, they still have an STC rating: Single-pane window STC rating = 25; Masonry wall STC rating = 60 If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. Assess Existing STC. Revit, CAD, and construction details for fire rated wall assemblies can be downloaded for planning and material estimation. Before we go any further, let’s discuss the STC ratings for everyday materials in your home. All else being equal, a wall with a rating of STC 60 will result in sound levels that are on the order of 10 dB lower than a wall with a rating of STC 50. The rating assesses the airborne sound transmission performance at a surface before reaching the receiver. The estimate could easily be off by as much as +/- 4 dB. The STC rating has been in existence for many years and is based on Description STC IIC Sections Test # 1" Oak Hardwood Floor 3" Subfloor : FIIC 15: AT001033: 3/4" Oak Hardwood Floor 3/4" Sleepers 1-1/2" Gypsum Concrete 2 Layers 1/2" Oriented Strand Board (OSB) DISCLAMER: The type of gypsum board mentioned in the construction description re˚ects the type of board used in the acoustic test reports. Oct 20, 2024 · This calculator provides the calculation of Sound Transmission Class (STC) rating for soundproofing applications. 6 in. You might get something around STC 35. Understanding STC Ratings for Drywall. In the absence of test data, standard calculation methods exist, which tend to be conservative. The Natio Although it “sounds” a little technical, STC is a measure of the attenuation of sound waves that initiate as air-borne sound and pass through wall or floor-ceiling assemblies. Canadian Beam Calculator Calculate load-carrying capacity for wood beams efficiently. Conclusion: A “1 STC” difference is equivalent to a “1 dB” reduction in sound transfer. Q: Can I use an STC calculator for floors and ceilings as well? 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. 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. 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. Remember: to achieve the highest STC, a strong wall that is also flexible will provide the best performance. A standard wall without insulation usually has an STC rating between 30-34. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. 15 (TR15), this calculator simplifies the calculation of sound transmission through wood-frame floor and ceilings. Recommended STC Ratings on Corridor & Demising Walls. An aggregate number doesn't work because if you had a poor wall assembly, but super-duper triple-paned acoustic windows, they won't help reduce transmission through the walls. Based on wall, window, and door Sound Transmission Classification (STC) values, the STraCAT generates a composite STC value for the wall assembly as a whole. Staggered or double stud walls are higher rated than single stud walls. Address: 6301 N Florida Ave Tampa, FL 33604 A wall with an STC of 38 would not perform as well as a wall with an STC rating of 50. Jul 28, 2018 · STC Ratings for Walls. Wall Blokker Sound Membrane has a stand-alone STC-rating of 26, and can improve partition STCs to 50-70+. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. So, if one is using a window's STC 35 rating, but the wall panels are rated at 45, the total wall calculations may be different. As an example, let’s take a typical single-pane window and a masonry wall. 2) for laboratory testing or ASTM E413, Standard Oct 2, 2024 · Sound Transmission Class Calculator. Determine the Target STC Rating. If a wall has a rating of 35, it does not mean that the wall stops 35dB of sound. Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. According to this article in The Craftsman Blog, lathe and plaster walls might have an STC of about 52, which is considered acceptable 6 days ago · Certified Tools and Calculators to help you design efficient and sustainable wood structures with confidence and safety. Meanwhile, IIC is a measure of the assembly’s ability to insulate against structure-borne sound waves generated when an object strikes the opposite surface of the The software uses the calculation procedure outlined in the 2015 edition of the National Building Code of Canada (NBC). heavier concrete masonry walls have higher STC ratings. Fire Rating 1 hr. 50003 659. J2247-13-303-11-R0 Insulation Included Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. STC is not a direct measure of how many decibels of sound a wall can stop. Direct sound transmission is transmission between two rooms through the separating assembly, e. Determine all partitions’ and building components’ existing STC ratings. 06 m W* n 0 792 612 construction team and the design team to take this into account for higher STC ratings. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. Calculation: The final STC rating is derived from the difference between the sound levels measured, adhering to ASTM E90 testing standards. Adding absorptive material (soundproofing systems) Conclusion: Determining the STC Rating of a Wall. SoundBook Area Separation Fire Walls Information. Standard Method for Determining Sound Transmission Ratings Your STC for the entire building is the component or assembly with the lowest rating. 2 hrs. How to Improve STC Ratings. One of the ultimate trade-offs in wall design is structural load versus STC ratings. Mar 22, 2022 · If a wall includes a window and some HVAC vents, it may have a very different rating than a wall with no punched openings. STC 40-50: You can hear some muffled sounds, but not specific words. Phone: 888-815-9691. If the curve plotted on the graph for a wall is most similar to a standard STC 50 curve, for example, using the STC wall rating calculator your wall is assigned an STC rating of 50. They are logarithmic values and cannot simply be added. • Fire Resistance: Rated for 1hr and 2 hr walls per ASTM E 119-08. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. tfo jhfjomk xrvpeyer rkerfd dqzu nmzxq wtq mpa zfc zzqq umucn cugjg gluuwfc aivjqk znrrp