In the case of an STC rating for a ceiling you typically have two options. see "it's the difference that counts!” in any case the operable wall/partition is only part of a system and the "stc requirement" should be in line with the other construction elements of the area. They provide, however, a useful general measure of. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. If the exterior windows and doors together comprise 20-35% of the Total Exterior Wall Area, the windows shall have a laboratory sound transmission class rating of at least STC-30. The same tire worn to 8/32-inch of remaining tread depth is calculated to be 1/8" shorter with a diameter of 24. nominal STC 57 wall while the lower curves are for the nominal STC 46 wall. the level of the "stc" requirement should be based upon the activities taking place in the adjoining areas. Load bearing: Yes No. The gypsum board wall regres-sions were derived from data in NRC internal reports IR-693 and. Impact Sound. STC Ratings. Using resilient channels and clips between wall panels and studs can improve the STC from 2-5dB. "R" Factors: The higher the value the better the rating. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. When designing partitions, the CAC rating of the ceiling should be close to the STC rating of the wall for optimal performance of the system. When 75 mm (3") of mineral wool sound batts are added to the wall cavity, the STC rises to 56. design can provide. Sound Transmission Coefficient. The typical rating for single pane windows is 18-20 while a double glazed window is 28-32. contributions of various products to an STC or IIC rating are shown in Table 18. The above prices are exclusive of GST. Simple Ways to Improve STC Ratings. It is determined by fit-. Do yourself a favor and don”t rely on STC ratings for traffic noise. This involves using an amplified speaker to produce broadband noise in one room (source. Metal Deck Flute Fillers. Louvers in MER doors negate any significant composite STC rating of the door/wall assembly. Determination of Sound Transmission Class. How Do Soundproofing Windows Work? To reduce sound, you must create a barrier between the sound and ear that captures the sound. The STC rating for a six inch concrete sub-floor is 52-55. Steel frame walls typically feature flexible insulation between the studs, often for better acoustics. UBC requirements for walls: STC rating of 50 (if tested in a laboratory) or 45 (if tested in the field*). Its performance is affected by every other component and the likelihood of achieving code compliance is contingent upon many other trades including framers, plumbers, drywall contractors to name a few. Installed Insulation R-value: The thickness of double stud walls varies; however, walls with overall insulation thickness of 9 1 / 2 ” appear to be most common. Sound travels through the air at a constant speed at a given temperature of air. Read product specifications, calculate tax and shipping charges, sort your results, and buy with confidence. The final result is the effective STC of the composite barrier. The Weighted Sound Reduction Index (Rw) was determined in accordance with ISO 717, "Rating of Sound Insulation in Buildings and of Building Elements, Part 1: Airborne Sound Insulation in Buildings and of Interior. 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. The difference in STC ratings is quite a bit. Window Tint Warriors Recommended for you. AcoustiGuard – WILREP LTD 1515 Matheson Blvd. If the concrete flows freely into the wall with no restriction, it is likely too high a slump. Entrance Doors from interior corridors shall have an STC rating of not less than 30. As mentioned before, an exterior wall STC rating is likely somewhere in the mid 30's to mid 40's. STC Wall & Floor Configurations; STC & Fire Ratings. Water: The “W” rating, established in 2004, indicates the fire-stopping material has passed the UL test for water tightness. Fire Resistance Rating: STC Rating: Fire Resistance Rating: For Homeowners. However, errors may still occur and Knauf AMF. E413-87 in an acoustica l wall. Strategies to achieve the recommended NC and STC ranges include, for example: Type II vinyl wall covering and fabric covered acoustical wall panels for the interior wall finish in the auditorium; Type II vinyl wall covering for the stage area; Type II vinyl wall coverings for 1/3 of the front of the orchestra (audience) sidewalls and fabric. Sound travels through the air at a constant speed at a given temperature of air. walls between apartments usually require a minimum STC of 50. STC Rating: Fire Resistance Rating: For Homeowners. 18-gauge (3 5/8-inch) steel studs. (Solid curve is the mean, dotted curves are minimum and maximum. reduction rating for that wall would be 30 dB(A). design can provide. The RSIC isolates the drywall from the wall studs and uses a rubber element to reduce the vibration path between rooms, thereby increasing the STC rating. Sound transmission class (STC) provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications. Minimum Sound Transmission Class Ratings (1) Except as provided in Sentence (2), every dwelling unitand every suite in hotelsshall be separated from every other space in a buildingin which noise may be generated, by an assembly providing a sound transmission class rating of at least 50, measured in accordance with. Applicable Products : Windows, doors, interior and exterior wall constructions, floor-ceiling systems, roof assemblies, curtain wall and storefront. The load-bearing metal stud walls achieve 1-hour or 2-hour U. For example, if the curve created by one of your walls most closely matches the standard STC 40 curve, your wall will be said to have an STC of 40. sound control rating system in the window industry. The rating may vary for earthquake, wind and also for the length used. In one study, a 2x4 16-inch on-center wall was insulated with batts labeled R-13, but researchers calculated the actual whole-wall insulation value of the wall at R-9. In Europe it is common to use the alternative Noise Rating Curve - NR. com Use the STC Calculator to find the STC Rating of your wall by filling out the form below. It"s designed for interior partitions, originally for offices, and it doesn"t address freqs below 125 Hz. The higher the STC rating, the more effectively a wall, floor or ceiling controls sound transmission. However, errors may still occur and Knauf AMF. Windows and glass doors with minimum STC ratings as shown in Table 2. Architectural Window (AW) AAMA rating: 1. sound transmission through the separating wall or floor. 2 (IRC Table N1102. UBC requirements for floor/ceiling assemblies: STC ratings of 50 (if tested in a laboratory) or 45 (if tested in the field*). A 1" rockwool acoustical blanket adds 3dB to the wall's STC. see "it's the difference that counts!" in any case the operable wall/partition is only part of a system and the "stc requirement" should be in line with the other construction elements of the area. Determination of Sound Transmission Class. Walls Floors. The Sound Transmission Class (STC) is used to evaluate airborne noise and Impact Insulation Class (IIC) is used to evaluate impact (or structure borne) noise. Airborne Sound. with 5d coated nails, 1-5/8” long, 0. STraCAT is an evaluation tool. (*) This rating system is published by the American Society for Testing Materials (ASTM) as ASTM E413-87. Click here to calculate your return. Resilient channel can improve the STC rating of an assembly. Therefore, all these 8” together would provide 0. 91 million for the quarter. Chapter 7 of the International Building Code (IBC). Gypsum wall board is extended 6” above the acoustical ceiling panels. 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. The units of measurement are W/m²K. Won-Door FireGuard is also listed as a moveable fire wall (ASTM E-119) in straight, single parting configurations. Higher STC values are more efficient for reducing sound transmission. Some common assembly ratings are shown in Table 1. Staggered or double stud walls are higher rated than single stud walls. The equation is used only for uncoated fine or medium textured concrete masonry units. All have panel widths of 4″, and industry leading sound ratings up to 56 STC. 2 Tubes is the way to go. 4 Consider the STC rating needed for the job. Entrance Doors from interior corridors shall have an STC rating of not less than 30. factory results. • Cellulose insulation outperforms all other insulation systems for sound attenuation. Submit Your Photos. Sound transmission class (STC) rating is a single number value, which describes the overall acoustic performance of a construction system. STC is the wall equivalent of CAC. For example if the sound on one side of a wall is measured at 100 decibels and drops to 60 decibels on the other side, the wall blocks 40 decibels of sound and earns an STC rating of 40. The Reverberation Time (RT) in areas (e. It”s designed for interior partitions, originally for offices, and it doesn”t address freqs below 125 Hz. Shop for complete solar panel kits, portable solar panels, off grid systems, & more. FINISH THE WALL. Door Model Fire Rating. For field measurements the corresponding rating is the Field Sound Transmission Class or FSTC rating (American Society for Testing and Materials 1980d). The standard STC contours are shown in Table 3. STC and OITC ratings are measures of resistance of a building element (e. STC does not really apply to today's audio system. Click on the "i" to learn more about the system attributes. Table 2 relates STC with the hearing quality. RSIC-V Steel Wall Systems. Since there are multiple manufacturers product involved in creating the comprehensive assemblies I have discussed, I do not know of a manufacturer who has ponied up the hundred grand to get. Owens-Corning 2” thick Soundproofing Insulation has a density of 10 lb/ft³ and claims it will add an STC of 18 to your uninsulated wall with an STC of 35, to bring it to an STC of 53. Use our resources below to find more cost-effective ways to improve your STC Rating, or use the STC Calculator to determine alternate wall designs. All factors considered, solar energy systems in Canada operate at an approximate efficiency of 15%. 2 of the LAMC for field-tested assemblies is to be used for acceptance of individual jobs only. The sound energy that gets stopped by a wall, doesn't go through the wall, and that means it ends up staying inside the room. 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. per square foot and an STC rating of 69. resilient channel to attain STC (sound transmission class) This translates into lower cost of construction and because the wall assembly takes up less space (less gypsum and/or RC) there is more marketable square footage in the buildings that use R-stud. Resilient channel can improve the STC rating of an assembly. FC Kaiserslautern 1. Construction STC abbreviation meaning defined here. An STC contour curve is applied to the actual measured transmission loss data, and the transmission loss value on the contour curve at 500 hertz is the STC single number rating. Since there are multiple manufacturers product involved in creating the comprehensive assemblies I have discussed, I do not know of a manufacturer who has ponied up the hundred grand to get. STC and IIC Ratings for Various Configurations. For reference, standard house walls are 33 STC, while studio-level soundproofing requires a rating of at least 45. 6) Peter: I have a 300 square foot basement with the plan to use quietrock as the lid component. Architectural Graphic Standards; Wall Weight (lb/sq. It is a calculation based on transmission loss values through an element. The lower STC materials are the weak links, and greatly lower the overall STC, even when covering relatively small areas. Hotels, motels, apartments, hospitals, nursing homes, schools, churches, and multi-unit complexes use Nu-Wool Premium Cellulose Insulation in their walls, floors and attics for sound control. STCU Best of Broadway. Decibels - Decibels, dB, are a simple measurement of how loud something is. An airspace of 1 ½" will improve the STC of a partition by approximately 3 dB, while an air space of 3" will improve the STC by approximately 6 dB. A drop voltage less than 1% is suitable and in any case it must not exceed 3%. Seamless pipes are considered superior to welded pipes as they are built using monolithic steel billets, with intrinsic mechanical strength, without seam welds. Table 2 relates STC with the hearing quality. Fire barrier walls and fire door assemblies carry a fire rating. Won-Door FireGuard is also listed as a moveable fire wall (ASTM E-119) in straight, single parting configurations. 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. 9 USG Acoustical Assemblies Plaster Systems –Veneer plaster partitions achieve up to 63 STC in steel-framed resilient systems and up to 52 STC in wood-framed resilient systems –Have achieved 1- to 4-hr. acoustical performance of operable walls is the Sound Transmission Class (STC) rating. Find the right fire-rated assemblies and design details drawings for your architectural plans. 5" uninsulated stud wall is approximately 33. This guideline calls for “improved acoustical analysis of assemblies, components and installation methods, and a more detailed inspection. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35. STC Ratings. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. Do not locate mechanical equipment rooms next to offices and conference rooms. Home / Tools / Assembly Tool / List Assemblies. door or window occupying 21% of the composite wall area (21 sq. Adding Mass The weight or thickness of a partition is the major factor in its ability to block sound. SunPower X-Series panels produce 55% more energy in the same space over 25 years: SunPower 400 W, 22. An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35. SAFE'n'SOUND ® sound proof insulation is a stone wool insulation product for use in interior wall partitions of residential wood and steel stud construction. A resilient channel is a metal bar that is used to ensure that the drywall and wood framing inside the wall (called studwork) don’t touch, as the drywall is screwed onto the channel instead of the stud. Estimate materials and find USG equivalents for your building projects. Achieve a total STC of 45** in an existing wall and stop about 2/3 of the noise heard thru that wall. Orfield Laboratories, Inc. Tests also qualify cellulose insulation as an effective fire stop around steel through penetrations in fire-rated walls. The test results paint a pretty clear picture of how the choice of stud gauge and spacing will affect the STC rating of your wall. Acoustics Calculator. The calculator may also be used to investigate the effects of different materials on a wall assembly that otherwise complies with the prescriptive wall insulation component R-values for wood-framed walls found in IECC Tables C402. Staggered Stud Vs Double Wall - Which One is Right For You. Doubling the mass of a wall assembly does not double the STC rating. nominal STC 57 wall while the lower curves are for the nominal STC 46 wall. #N#Staggered stud wall construction with 1 layer of 16mm (5/8") Plasterboard on studs of 95x35mm (4 x 11/2. Results are compared to a standard STC reference curve. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. We love that the blinds are in between the two panels of glass. A noise barrier wall of 6 in height as described in section 5. When 92 mm (3⅝") steel studs are substituted, the wall has an STC rating of 48. The STC rating for a basic insulated 2×4 wall with a single layer of drywall on each side is 35-38. Workmanship and installation. Therefore, all these 8” together would provide 0. In a typical 2 x 4 wall with a single layer of 1/2" drywall on each side (Tested STC): o Cellulose STC41 o Fiberglass or mineral fiber STC38 o Icynene STC37. It is a single number that attempts to characterize the overall ability of a material to reduce the transmission of noise. Hotels, motels, apartments, hospitals, nursing homes, schools, churches, and multi-unit complexes use Nu-Wool Premium Cellulose Insulation in their walls, floors and attics for sound control. In a CAC test sound passes from a source room, through the ceiling plane, across a shared air space and then through the ceiling plane of the receiving room. Strategies to achieve the recommended NC and STC ranges include, for example: Type II vinyl wall covering and fabric covered acoustical wall panels for the interior wall finish in the auditorium; Type II vinyl wall covering for the stage area; Type II vinyl wall coverings for 1/3 of the front of the orchestra (audience) sidewalls and fabric. The gypsum board wall regres-sions were derived from data in NRC internal reports IR-693 and. Since there are multiple manufacturers product involved in creating the comprehensive assemblies I have discussed, I do not know of a manufacturer who has ponied up the hundred grand to get. per second (on a average temperature day) or a little over one mile in 5 seconds. *OITC is estimate d base d on this test. As a reference, you can hear normal speech through a wall with an STC of 25. The STC rating of a standard 4. Walls, partitions and floor/ceiling assemblies separating dwelling units from each other or from public or service areas shall have a sound transmission class (STC) of not less than 50 (45 if field tested) for air-borne noise when tested in accordance with ASTM E 90. You can now see that the weakest acoustic link in a typical building is the windows and doors. A standard metal framed stud partition lined both sides with ½" drywall with fiberglass insulation in the wall cavity,gives an STC rating of around 20-25 or less. Others include the sound transmission class (STC) and the noise reduction coefficient (NRC). It is a single number that attempts to characterize the overall ability of a material to reduce the transmission of noise. Acoustic products are given two STC ratings, one of which is a "sealed in place" rating, and the other is an "operable. Sound Transmission Class. STC is determined by a weighted average of TL values taken over 16 frequencies, which are fitted to a curve in a method defined by the ASTM E413 Classification Standard for Rating Sound Insulation. PDI's high performance Sonicbar® sound control steel window units achieve STC ratings as high as 56 STC. If that's not an option (and it probably isn't), you're going to have to look into how you can ensure that your walls meet a specific STC rating. The typical rating for single pane windows is 18-20 while a double glazed window is 28-32. design can provide. When faced with this issue in the past we have calculated the STC rating from the 1/3-octave transmission loss data from which the Rw is calculated, then submitted the STC data for LEED. The Window Wall is available in double glazed and triple glazed configurations, and boasts overall system R-values for the fixed and operable vision areas of over R-4 double glazed and over R-7 triple glazed. Shared branching. The STC is detached dwelling with dimensions detailed in Table 1. FINISH THE WALL. OITC differs from the STC rating in that the OITC was developed specifically to indicate transmission of noise from transportation. STC OR NIC Rating = [No canvas support] Frequency (Hz) STC Contour Contour Level (dB) TL or NR (dB) Deficiency Pass or Fail 1/3 OBCF 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 Sum of Deficiencies: Guess STC OR NIC. In Europe it is common to use the alternative Noise Rating Curve - NR. Small generation unit STC calculator Calculate the number small-scale technology certificates (STCs) for small generation units (small-scale solar, wind or hydro systems) Please note that STCs can …. Its primary function is to achieve and maintain the specific STC (Sound Transmission Class) value of the system designed. This product is used as a sound isolation material. An airspace of 1 ½" will improve the STC of a partition by approximately 3 dB, while an air space of 3" will improve the STC by approximately 6 dB. 5V 9V 12V Regulated Multi Voltage Switching Replacement Power Universal AC Adapter for Household Electronics Routers Speakers CCTV Cameras Smart Phone USB. Direct sound transmission is transmission between two rooms through the separating assembly, e. 5" channel glass walls reach STC 43. This rating increases to STC 42-45 with steel studs. The STC sound icons can also be clicked on to simulate tones to help reference frequency differences between STC ratings. Each wall, floor or ceiling assembly has a different performance for Thermal (R value), Sound (STC) and Fire. For example, simply placing a bead of sealant on each side of the wall assembly where the wallboard meets the ceiling member can improve the Sound Transmission Class (STC) rating from 29 to 53, as demonstrated by the ASTM C919 Standard Practice for Use of Sealants in Acoustical Applications. STC is the wall equivalent of CAC. Sound travels through the air at a constant speed at a given temperature of air. Sound Transmission Class (STC) - The STC rating is a single number value quantifying the ability of a material to resist the transmission of sound. 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. ‎Should I sell my soybeans or grain to the local elevator or the more distant market offering a premium price?. The STC (Sound Transmission Class) rating was created to provide a rating for interior building partitions that are subjected to noises from mid to high frequency noise sources. The standard STC contours are shown in Table 3. Particularly, in the International Building Code, STC 50 is required for dwelling units to adjacencies. *OITC is estimate d base d on this test. STC Values: The values represent core standards only. 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). A noise barrier wall of 6 in height as described in section 5. STC Lab Test Results Dual Pane 1/8" over 3/16" Tested at various air spacing between the test window and a Soundproof Window 31 STC Test Window - STC Test Result Range: 47 57 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. This rating increases to STC 42-45 with steel studs. Please enter your contact information and one of our representatives will get back to you with more information. Instructions. The first column is the rating of the door panel only; tested in a static inoperable condition to determine the sound transmission through the door. International Cellulose Corporation cannot guarantee actual STC ratings. When selecting the right Working Walls Solutions product for your noise problem, you need to first identify what the problem is. This involves using an amplified speaker to produce broadband noise in one room (source. Sound Transmission Class (STC) is a measurement used to reat the resistance of a wall, ceiling, or floor to the passage of sound. Esti-mated ratings are derived from regressions developed for several large sets of NRC measurements. STC 50 IIC 50 FSTC 45. STC Lab Test Results Dual Pane 1/8" over 3/16" Tested at various air spacing between the test window and a Soundproof Window 31 STC Test Window - STC Test Result Range: 47 57 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. In addition, STC is only a measure of how much vocal sound can be stopped by a wall. Description 2x4 stud, 5/8" gyp (2 layers total), Batt insulation 2x4 stud, 5/8" gyp (3 layers total), Batt insulation Estimated STC Rating 34 - 39 Wall Assembly. Fire Test Reference: UL U317,cUL U317. Applicable Products : Windows, doors, interior and exterior wall constructions, floor-ceiling systems, roof assemblies, curtain wall and storefront. Instructions. these requirements is used as the STC curve. Hourly Rating: 45-minute. Single 95x35mm (4"x2")Stud wall with 1 layer of 16mm (5/8") Plaster board on one side and 1 layer of 16mm on the other side on a horizontal flexible channel at 600mm (2ft) centres screwed to the stud. FC Kaiserslautern 1. Protect your home from steam and moisture damage. 086” shank, 15/64” heads, 7” o. Construction practices have an influence on field STC ratings. National Geographic Live. The firm had revenue of $509. 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. Sound Transmission Class. STC does not really apply to today's audio system. For example, if the curve created by one of your walls most closely matches the standard STC 40 curve, your wall will be said to have an STC of 40. Wall Insulation: Whenever exterior siding is removed on an. 086” shank, 15/64” heads, 7” o. Previously, in order to achieve an STC rating in the 50s expensive specialty materials and wall configurations were needed. a F-IIC and F-STC rating. STC was originally developed to measure the sound transmission between interior walls. 75 earnings per share over the last year and currently has a price-to-earnings ratio of 7. 1/8" 35 35. 11 SOUND TRANSMISSION CLASS is a single number that represents the sound blocking capacity of a partition such as a wall or ceiling. A wide variety of STC ratings is available with concrete masonry construction, depending on wall weight, wall construction and finishes. But that's not the end, it's just the beginning of the story. Like the STC rating System, OITC measures sound intensity loss in decibels. Rigid insulation is fixed over either face of the steel frame. However, the STC rating will be much less than the sum of the STC ratings of the individual walls. One of those ways is to install Whisper Mat, a … Continue reading "Peaceful Living with Whisper Mat". Estimate materials and find USG equivalents for your building projects. With minimal demolition, the most basic way to soundproof exterior walls is by adding a layer of 5/8″ drywall with Green Glue Compound in between the layers or by adding 1 LB or 2 LB mass loaded vinyl (MLV) over the existing drywall and covering that with a new layer of drywall. If a wall has a rating of 35, it does not mean that the wall stops 35dB of sound. Reproduced above is the graph of an actual sound transmission-loss test of a drywall partition, Test No. STC Lab Test Results Dual Pane 1/8" over 3/16" Tested at various air spacing between the test window and a Soundproof Window 31 STC Test Window - STC Test Result Range: 47 57 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. R-studs are made. 3 Structure-borne. Face layer 1/2" Type X gypsum wallboard applied parallel to each side with 4" wide strips of drywall laminating adhesive 2" from board edges and. It is a single number that attempts to characterize the overall ability of a material to reduce the transmission of noise. STC is the wall equivalent of CAC. Single Wall Accordion Partitions: 83 inches (2108 mm) high by 68 inches (1727 mm) wide. Lithe wall has a much larger percentage of the total exposed surface area, then the window SIC rating can be up to 10 points lower than the wall STC. STC ratings are measured as a difference in decibel levels, where a higher rating indicates more complete sound absorption and sound deadening performance. GIB® Site Guide 2018 - Complete Manual. Impact Sound. The STC rating is typically very similar to Rw but they are not always exactly equivalent. • Doubling the mass of a wall assembly does not double the STC rating. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. STC ratings are used for windows, doors, walls and most building materials. Its very important to get the R value for uninsulated surfaces as close as you can, as small changes in these values will make for large changes in your heat loss. View all categories. EPS is the perfect material for filling in the flutes in metal roof and bridge decking. Cellulose insulation is more flammable than other products because it's made from paper. How STC is actually calculated is you plot the loss of sound across the a large range of frequencies(125 Hz to ~4000Hz) and then compare it to the standard plots for various STC ratings. Luckily, there are many ways to improve the STC ratings on your walls and help block more sound. The rating may vary for earthquake, wind and also for the length used. If the concrete flows freely into the wall with no restriction, it is likely too high a slump. Sound Transmission Class Ratings for Concrete Masonry Walls; Fire, Energy & Sound Calculator; STC=(weight of wall) 0. Sound Transmission Coefficient. The STC wall rating for a basic insulated 2×4 wall with a single layer of drywall on each side is ST 35-38. ‎Should I sell my soybeans or grain to the local elevator or the more distant market offering a premium price?. 18W + 40 where W is equal to the weight of the wall expressed in terms of pounds per square foot. UBC requirements for floor/ceiling assemblies: STC ratings of 50 (if tested in a laboratory) or 45 (if tested in the field*). STC ratings are shown for different amounts of drywall and insulation levels. With Insulation 47. Single Number Ratings -STC Intent: a single number rating to compare isolation of different assemblies. 2x4 stud, 5/8" gyp (4 layers total. When 92 mm (3⅝") steel studs are substituted, the wall has an STC rating of 48. The Class One requirements for water tightness include subjecting the material to a 3-foot water column for 72 hours, followed by a fire and hose stream test, conducted in accordance with ANSI/UL 1479. The STC is a single-number rating of the sound transmission performance for a partition tested over a standard frequency range. 5% reduction of air infiltration compared to fiberglass insulation, with. (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. Trademark Soundproofing Reply: 2 tubes will add 9 STC points. It is important to note that STC ratings are given to partitions by rating agencies after testing in a laboratory. The Sound Transmission Class (STC) was determined in accordance with ASTM E413-87, "Classification for Rating Sound Insulation". An area separation wall is a component of townhouse construction, used where townhouse share a common wall. Skyline views, trendy neighborhoods, and no outdoor maintenance are all large draws for the condo market – but one thing’s for sure, nobody enjoys a noisy neighbor. November 21 | Medium-Density Housing 5 branz. The resulting narrow gap with filled with non-hardening acoustic sealant. STraCAT uses the graph in Figure 17 of the HUD Noise Guidebook for the calculate a combined Sound Transmission Classification (STC) for a wall and other wall components (windows and doors) at a Noise Assessment Location (NAL). UBC requirements for walls: STC rating of 50 (if tested in a laboratory) or 45 (if tested in the field*). As we can tell from the process used to rate the Sound Transmission Class of a wall, it is possible to have 2 walls with slightly different curves but both having the same STC rating. 2 (IRC Table N1102. 0 lb per cubic foot Total), Fiberglass Batting with Quilted Vinyl covering on front back side encapsulating a 1 lb per sq /ft Mass Loaded Vinyl Interior. Warnock at NRC to estimate the STC rating for stud walls of various configurations as well as STC and IIC ratings for joist floors. STC is the oldest and most widely recognized sound control rating system in the window industry. R-stud is eco-friendly from production through construction. with 1-5/8" (41 mm) cement coated nails spaced 7" (178. STL is the decrease or attenuation in sound energy, in dB. Do yourself a favor and don”t rely on STC ratings for traffic noise. - (13 mm) or 50 5/8-in. Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. Reproduced above is the graph of an actual sound transmission-loss test of a drywall partition, Test No. Commercial real estate. Option 1: Less expensive, less flexible. Hambro Floor/Ceiling Assembly with Quarry Tile Finish on Acoustiblok & Acoustiwool-TFO. Some manufacturers have even qualified two- and three-hour firewall designs using Cellulose Insulation. STC Values: The values represent core standards only. Gypsum wall board is extended 6” above the acoustical ceiling panels. Services and resources. 2x4 stud, 5/8" gyp (4 layers total. The STC rating for a basic wood structure floor/ceiling is STC 40-43. Fire Test Reference: UL U317,cUL U317. The STC Calculator is a tool designed to provide expected STC ratings of your UL assembly based on stud size and spacing, wall types, and drywall layers. Sound Transmission Class (STC) STC is a numerical rating of how well a building partition attenuates airborne sound. STC is determined by a weighted average of TL values taken over 16 frequencies, which are fitted to a curve in a method defined by the ASTM E413 Classification Standard for Rating Sound Insulation. So if the noise outside is 70dB and inside it is 40dB, the window is said to have an STC rating of 30. STC Lab Test Results Dual Pane 1/8" over 3/16" Tested at various air spacing between the test window and a Soundproof Window 31 STC Test Window - STC Test Result Range: 47 57 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. The cellulose. This is a problem where we have three layers for a wall and those three layers are made up of stone, polyurethane board and plywood. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. Sound Transmission Class from the American Society for Testing and Materials (ASTM) E336/E413 and Impact Isolation Class ASTM E492/E989 ratings are measured in decibels reduced for certain types of sound. Sound transmission class (STC) provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications. Determination of Sound Transmission Class. If you have a space with too much echo, you need a product with a good NRC like our APS-3 or HIAPS-3 panels. STC ratings are shown for different amounts of drywall and insulation levels. The first number is the maximum on center (o. 24 mm) 1/8" 0. The product line continues to maintain the Red-List-Free listing achieved by the base. Read further online reviews on laminate floorings for offices and homes. Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies, California Dept. STC is a laboratory-measured rating of the sound insulation performance of a wall assembly. DARFON MIG320 Microinverter 240VAC 60VDC for 72 and 60 cell modules 300W Output Power Recommended STC module input power range 200W - 350W Available also for 208VAC, 277VAC and 220VAC (50Hz or 60Hz) Up to 19 units per 30A branch, Intergrated Grounding, Amphanol H4 Connector, Free Lifetime online monitoring, 5 Year warranty. The method used to calculate the STC rating is ASTM E413. Walls are tested under laboratory conditions with varying frequencies (125-4000 cycles per second) to determine how much a sound level decreases when it transmits from one side of the wall/partition to the other. STC ratings are used to measure the effectiveness of these products, such as doors. Core-fill 500 is a fire-rated class a building material for use in concrete, masonry, blocks, cavity walls, between brick and blocks. Wall Systems that list STC ratings as "N/A" have not been tested yet. Outdoor-Indoor Transmission Class (OITC) measures the sound transmission loss of exterior glazing applications. Filter ProSTUD wall systems by: Wall design Wall assembly limiting heights STC sound ratings UL fire protection In addition, iProSTUD 2. 1″ Thick Front and 1″ Thick Back (2″ Thick Total and 2. Quality windows can be used as a sound. The noise reduction coefficient is the arithmetic average, rounded to the nearest multiple of 0. The available range of sound transmission loss capabilities using standard designs is adequate to satisfy most conditions without requiring special designs. When selecting the right Working Walls Solutions product for your noise problem, you need to first identify what the problem is. STC is the oldest and most widely recognized sound control rating system in the window industry. Decibels - Decibels, dB, are a simple measurement of how loud something is. The measurement is over a frequency range of 125-4000 Hz (Hertz) and uses transmission loss to calculate what the STC is. 7 mm) ToughRock® Fireguard C® or 1/2" (12. This involves using an amplified speaker to produce broadband noise in one room (source. Taking into account any existing acoustical properties of the room, one can take some simple room measurements to calculate the amount of sound absorption that can be added to the room to achieve the. Adding additional layers of drywall can improve the STC rating of an assembly. You can usually add stuff to wall and floors without affecting the STC rating as long as the required components are still present. 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. Results are compared to a standard STC reference curve. fire ratings depending upon how many layers of drywall are used. We welcome the opportunity to be a part of those authentic moments. spent to build noise control ceilings and walls • Exclusive UL design L583 offers 1-hour fire rating for typical wood-framed ceiling composites with Sound Damp2 STC 50 without Sound Damp2 STC 39 5/8" Gypsum Board 2" x 4" Wood Stud Wall Studs 16" on Center (2) Layers 5/8" Gypsum Board 5/8" Gypsum Board 2" x 4" Wood Stud Wall Studs 24" on. Hourly Rating: 45-minute. The STC rating for a six inch concrete sub-floor is 52-55. The OITC is a rating intended for exterior building facades, and is an estimate of a wall's or window's ability to reduce typical transportation noise. (16 mm) thick gypsum wallboard. With minimal demolition, the most basic way to soundproof exterior walls is by adding a layer of 5/8″ drywall with Green Glue Compound in between the layers or by adding 1 LB or 2 LB mass loaded vinyl (MLV) over the existing drywall and covering that with a new layer of drywall. (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. 4: Test-Derived STC ratings for frame walls 4-18 Table 4. No additional putty material needed to plug the end of each electrical metallic tube or conduit at its connection to the box. In one study, a 2x4 16-inch on-center wall was insulated with batts labeled R-13, but researchers calculated the actual whole-wall insulation value of the wall at R-9. 11 SOUND TRANSMISSION CLASS is a single number that represents the sound blocking capacity of a partition such as a wall or ceiling. Read further online reviews on laminate floorings for offices and homes. Power rating is a quantity that describes the total electrical power required for normal operation of an electric appliance. In fact, these boards have been shown to increase the wall assembly’s STC rating by 10 or more points, while adding an extra layer of traditional gypsum board increased STC by two to three points. Each STC reduces sound energy by one decible. Standard Method for De-termining Sound Transmission Ratings for Masonry Walls, TMS 0302 (ref. Improved Fire Rating--Underwriters Laboratory has assigned a four hour rating (U. Savings and investing. Results are compared to a standard STC reference curve. RE-TESTING: Repeat Air Infiltration, Water Penetration testing & Operating Force. Free download at:. 04" and will roll 839 times per mile. 2 of the LAMC. 2x4 stud, 5/8" gyp (4 layers total. 7/8-inch x 25-gauge furring Channel @ 24-inch OC, RSIC-V clips @ 48-inch OC. The ratings are based on laboratory testing and do not take into consideration weak links within the wall assembly such as joints, penetrations and gaps around the perimeter of the wall assembly. If a 105-decibel above ground subway only registers as 80 decibels after traveling through a Window or wall, the sound experiences a 25-decibel deficit. Check out Bizrate for great deals on popular brands like Atlantic, AVF and Barkan. Wall lining – side 1 Framing Wall lining – side 2 Cavity infill STC 10 mm plasterboard 90 × 45 mm timber 10 mm plasterboard None 33 10 mm plasterboard 90 × 45 mm timber 10 mm plasterboard 90 mm blanket 36. STC ratings are measured as a difference in decibel levels, where a higher rating indicates more complete sound absorption and sound deadening performance. Financials and Reports. Sound Transmission Class Ratings for Concrete Masonry Walls; Fire, Energy & Sound Calculator; STC=(weight of wall) 0. The acoustic performance of glazing assemblies is expressed in two terms: Sound Transmission Class (STC) is used to measure the sound transmission loss of interior walls, ceilings and floors. ) The measurement is heavily weighted in the 1000 to 4000Hz frequency. Adding additional layers of drywall can improve the STC rating of an assembly. Request to view detailed reports. The available range of sound transmission loss capabilities using standard designs is adequate to satisfy most conditions without requiring special designs. Sound travels through the air at a constant speed at a given temperature of air. REV: 07-20-06 [30 KB]. Lamination, particularly using specialized acoustic interlayers, significantly improves the glass STC; increased panel thickness can also enhance sound control. STC provides a single number combining the wide range range of frequency data points. Limitations:. 3-m (24-ft) sections of SIP wall panels, which can help them address the framing labor shortages they face. PRINCE WILLIAM COUNTY ITEM DATE TYPE INSULATION/GLASS R-VALUE/STC RATING I certify that the above items are in conformance with the Certified Load Calculation. However, the STC rating will be much less than the sum of the STC ratings of the individual walls. About STC Ratings. , 32/16 or 48/24). Noises can be heard through a wall with an STC rating of 30 but should be much less audible through a wall with a rating of 60. This is a significant increase in sound improvement with a nearly 50% reduction in perceptible noise levels. In the case of an STC rating for a ceiling you typically have two options. ‎Should I sell my soybeans or grain to the local elevator or the more distant market offering a premium price?. The finished filler wall had a surface density of roughly 19 lbs. , Sound, Noise and Vibration Control, 1978. 2 of the LAMC for field-tested assemblies is to be used for acceptance of individual jobs only. A drop voltage less than 1% is suitable and in any case it must not exceed 3%. The lower STC materials are the weak links, and greatly lower the overall STC, even when covering relatively small areas. FSV Mainz 05 Aalborg BK Aarhus GF Aberdeen Abha Club AC Horsens Academica Clinceni Accrington Stanley AD Alcorcón Adelaide United ADO Den Haag AEK Athens AFC Eskilstuna AFC Wimbledon AIK AJ Auxerre Ajax Al Adalah Al Ahli Al Ain FC Al Faisaly Al Fateh Al Fayha Al Hilal Al Ittihad Al Nassr Al Raed Al. USG-241-ST. In a typical 2 x 4 wall with a single layer of 1/2" drywall on each side (Tested STC): o Cellulose STC41 o Fiberglass or mineral fiber STC38 o Icynene STC37. Depending on the amount of impact sound that is lost during the. To calculate TL an. What does STC stand for in Construction? Top STC abbreviation related to Construction: Sound Transmission Class. Calculate for toughened, laminated and annealed glassed with different thicknesses ranging from 2mm to 25mm. The RSIC isolates the drywall from the wall studs and uses a rubber element to reduce the vibration path between rooms, thereby increasing the STC rating. Sound Transmission Class (STC) Transmission Loss is a measurement of the wall systems ability to block sound at a given frequency. Supplying all their twin wall flue systems, flexible flue liner, chimney products and flue installation materials. - (13 mm) or 50 5/8-in. fire-resistance ratings for veneer and conventional systems. BUs ratings are all derived from testing elements at 2. The advent of high quality audio systems and home theaters has changed the building environment completely. 15/8" (41 mm) Steel Studs *Indicates value is an estimate Steel Framing STC Values Sound Control JM Formaldehyde-free insulations help reduce. mitigation performance of wall systems. Use our resources below to find more cost-effective ways to improve your STC Rating, or use the STC Calculator to determine alternate wall designs. "Determination of Sound Transmission Class" (ASTM E 413)8 describes a method for using the transmission loss values, determined as above, to arrive at a single figure rating for comparing the effectiveness of walls in resisting the transmission of airborne sound. Optional features include desiccant systems for moisture protection and sloped panes for reflection control. 6ft Long Cable) Ac Dc Adapter Compatible with Dokocom STC-A515B-Z STC-A515B-2 STC-AS1SB-Z STC-AS1SB-2 ITE Power Supply Replacement Power Supply Cord ZOZO 12W 3V 4. TC rating describes the average number of decibels blocked by a material. What is a steel pipe? A steel pipe is a round hollow section manufactured by drawing a solid billet (in carbon, alloy, stainless or nickel alloy steel) through a piercing rod. So, unless you’re familiar with soundproofing, you probably haven’t heard of STC until now. Just type in your room data - measurements and material - and the acoustics calculator generates a precise overview of reverberation time, absorption area as well as other relevant information about acoustics. Since there are multiple manufacturers product involved in creating the comprehensive assemblies I have discussed, I do not know of a manufacturer who has ponied up the hundred grand to get. Once you know the sound transmission class, consider what needs to be added to the ICF wall if an STC rating of 50 or higher is required, says John Krzic, accounts manager with Amvic Building System, Toronto. transmission loss curve to determine an STC rating. The resulting narrow gap with filled with non-hardening acoustic sealant. 7 mm) DensArmor Plus® Fireguard C® gypsum board applied vertically or horizontally to each side of 2” x 4” wood studs 16” (406 mm) o. Staggered or double stud walls are higher rated than single stud walls. USG-241-ST. V477 1 Hour Fire Rating. All have panel widths of 4″, and industry leading sound ratings up to 56 STC. HETAS approved - flue and chimney products. This industry standard ranges from zero (perfectly reflective) to 1* (perfectly absorptive). Noise Criterion - NC - were established in the U. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. STC is highly dependant on the construction of the partition. Many of the new types of lightweight walls have low values in the middle frequency range as compared to the old solid masonry walls. 2 (IRC Table N1102. It”s so heavily weighted that you can have a wall that only generates a 20 dB loss at the 125 Hz or 250 Hz markers and still get a 50 STC rating. STC and IIC are logarithmic, like the Richter scale. R-Value - Form and 8” Concrete Wall, by calculation Maximum Dimen. The REC Registry is an online system that: facilitates the creation, registration, transfer and surrender of large-scale generation certificates (LGCs) and small-scale technology certificates (STCs) tracks the ownership and status of all certificates; provides access to the STC clearing house, and. Another common misconception about STC is that it can be added- for instance. Walls Floors. An STC contour curve is applied to the actual measured transmission loss data, and the transmission loss value on the contour curve at 500 hertz is the STC single number rating. According to the standard, STC can be determined by field or laboratory. Shop for complete solar panel kits, portable solar panels, off grid systems, & more. How To Professionally Tint a Car Door window - 2013 VW Jetta (For Beginners ) - Duration: 25:48. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. This calculator determines Sound Transmission Class of monolithic materials (e. In a CAC test sound passes from a source room, through the ceiling plane, across a shared air space and then through the ceiling plane of the receiving room. This decrease is called Transmission Loss (TL). Only one pad thickness (1/8 inch) is required for a 1 or 2 hour fire rating. Acoustics Calculator Room Acoustics is the study of the effects of sound in a room in relation to the overall desired sound quality of that room. All factors considered, solar energy systems in Canada operate at an approximate efficiency of 15%. 1) If Wall A has a Sound Transmission Class of 60 (STC 60) and Wall B also has an STC 60 of 60, they are exactly the same. The higher the STC rating, the more effective that material is at reducing sound transmission of the most common frequencies. The diagrams and STC ratings listed below are intended to serve as a guide. A fire resistance rating is based on a fire resistance period and usually given in half-hour or hourly increments. Demystifying STC Ratings (STC-35, STC-45, STC-52) When clients come to us looking for soundproof control rooms, operator cabins and acoustic enclosures, we ask about the sound attenuation they need for their project (STC-35, STC-45 or STC-52+). According to the standard, STC can be determined by field or laboratory. Below are a few of the many different possible wall, floor and ceiling construction options. 3-m (24-ft) sections of SIP wall panels, which can help them address the framing labor shortages they face. with 1" Type S drywall screws 12" o. mitigation performance of wall systems. The NFRC label provides a reliable way to determine a window's energy properties and to compare products. Technical definition. STraCAT is an evaluation tool. Applicable Products : Windows, doors, interior and exterior wall constructions, floor-ceiling systems, roof assemblies, curtain wall and storefront. Every care has been taken in programming and compiling the product data of the room acoustics calculator. UL Fire Rating • Fire Rated Shaft Wall STC 60 • Lt Wt Toppings • RSIC fire rated roof systems • RSIC in Fire Resistive Designs • U356 RESIC-1 vs Isomax STC and OITC • Is the RSIC-1 clip fire rated? • RSIC fire rating list • RSIC-1 attached to an I joist • Steel Stud Fire Rating • Fire Rated 2 hour wall system • RSIC. SOUND TRANSMISSION CLASS (STC) - An integer rating of how well a building partition such as an interior wall, floor/ceiling, door, window, or exterior wall attenuates airborne sounds ranging between 125 and 4,000 Hz. It is determined by fit-. 757 Series - Sound Rated Curries has developed acoustical assemblies that solve noise problems for any facility. Wall Floor. Standard Method for De-termining Sound Transmission Ratings for Masonry Walls, TMS 0302 (ref. Higher STC values are more efficient for reducing sound transmission. With Insulation 47. 00 The updated version of this Standard provides minimum requirements for rating masonry walls for sound transmission class (STC) and outdoor-indoor transmission class (OITC) based on calculation. Airborne Sound. In modern bridge construction, EPS flute fillers help reduce the weight of the bridge construction by filling in the flutes in place of concrete. This is a problem where we have three layers for a wall and those three layers are made up of stone, polyurethane board and plywood. sound transmission through the separating wall or floor. The scale utilized is sensitive, with even minor changes in ratings resulting in dramatic differences in sound transmission. Lithe wall has a much larger percentage of the total exposed surface area, then the window SIC rating can be up to 10 points lower than the wall STC. Play some pink noise through a loudspeaker about 3' from the wall on the inside of the room. Sound Transmission Class The decibel (dB) is used to express sound intensity or loudness. All-new fire-rated floor-ceiling assembly files. The STC is used to rate the performance of walls, partitions, windows, etc. 48 The change in the sound transmission 49 class, STC, rating s for 1/2in. 5: Typical STC ratings for single-wythe concrete-block walls with hollow, sealed units 4-19 Table 4. The product line continues to maintain the Red-List-Free listing achieved by the base. The use of the room acoustics calculator forms no contract - no information contract or consultancy agreement - between the user of the room acoustics calculator and Knauf AMF GmbH & Co. A sound blocking level of STC 50 means that a listener in a quiet room would need to exert effort to hear raised speech levels in adjacent rooms, and the speech would not be understandable or disruptive. Resilient channel: Yes No. in a 2 x 6 wall cavity will add approximately 14dB to the STCrating. Laboratory testing of STC rating for SIP wall assembly. Its performance is affected by every other component and the likelihood of achieving code compliance is contingent upon many other trades including framers, plumbers, drywall contractors to name a few. That is because it is one of the few STC, or Sound Transmission Classification, ratings that are mandated by building code. Instructions. Even then, differences of 1-2 points STC can occur for the same assembly in. Demystifying STC Ratings (STC-35, STC-45, STC-52) When clients come to us looking for soundproof control rooms, operator cabins and acoustic enclosures, we ask about the sound attenuation they need for their project (STC-35, STC-45 or STC-52+). You can’t add STC ratings together. 91 million for the quarter. a F-IIC and F-STC rating. 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). If your wall graph is closest to a standard STC 35 curve, your wall is said to have an STC rating of 35. Rooms are noticeably quieter with Nu-Wool Premium Cellulose Insulation, which deadens the transfer of sound from one room to another. If that's not an option (and it probably isn't), you're going to have to look into how you can ensure that your walls meet a specific STC rating. 28a (ISO 15712) ASTC Figure 1. The first column is the rating of the door panel only; tested in a static inoperable condition to determine the sound transmission through the door. Explore Thermafiber Insulation. The standard requires a minimum laboratory STC rating of 50 for party walls and floor/ceilings. The higher the number, the better the noise isolation. In Europe it is common to use the alternative Noise Rating Curve - NR. Orfield Laboratories, Inc. 9 mm type x gypsum board, 38x89 mm wood studs 400 mm o/c, 90 mm glass. STC rating is determined by adjusting the standard contours to the measured TL. A wall system with higher STC rating is more effective in preventing the transmission of sound. In fact, these boards have been shown to increase the wall assembly’s STC rating by 10 or more points, while adding an extra layer of traditional gypsum board increased STC by two to three points. Both OITC and STC indicate a wall’s ability to block the transmission of sound from one side of the wall to the other. and the resulting STC—heavier concrete masonry walls have higher STC ratings. The same tire worn to 8/32-inch of remaining tread depth is calculated to be 1/8" shorter with a diameter of 24. An example calculation is given in Table 18. STC 50 IIC 50 FSTC 45. At today's buy back price of. All-new fire-rated floor-ceiling assembly files. The rating is determined by the equation STC = 0. It can also be used as the internal wall lining or as an external sheathing layer. The best is a room within a room design which is not practical in most cases. The computation logic is based on both US and European methodologies and results of actual Test Room measurements. Particularly, in the International Building Code, STC 50 is required for dwelling units to adjacencies. ratings are 43 determined by , gypsum wallboard Eq. The specified rating of 45 noted in Sec. Adding a layer of ½" gypsum board on resilient channels adds 5dB of attenuation. They provide, however, a useful general measure of. The better-insulated a structure is, the lower the U-value will be. Life is full of self-expression. at vertical joints and wall perimeter and 36" o. Entrance Doors from interior corridors shall have an STC rating of not less than 30.
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