Iic rating chart. , walking, shuffling).
- Iic rating chart The U. The higher the STC rating, the better a material’s ability to block sound from travelling from one space to another. Walls. Before we go any further, let’s discuss the STC ratings for everyday materials in your home. Delta IIC: This rating II 2 G Ex d IIC T6 Gb IP6x T -20°C to +55 °Camb ATEX Category (table 2) Gas - G Dust - D Protection Concepts (table 3) Sub-group (table 4) Temperature Classification (table This rating system (or IP code) is defined by the letters IP followed by two 'characteristic' numbers. Just like STC, IIC is a single number rating that measures a floor-ceiling assembly’s performance against impact noise at various frequencies. The process used to imprint the pattern of the flooring is able to The IIC number is roughly the reduction in decibels that a partition creates in the 100 Hz to 3,150 Hz range when tapped by the testing machine. It is 3mm thick and comes in either 100 sq. Corporate Brochure; Submittal Drawings; Installation Guidelines; Specifications; BIM | 3D | AUTOCAD; Literature; Need Pricing? Webinars. An IIC and STC rating will generally be 5 points higher than a F-IIC and F-STC rating. The higher the IIC rating, the more effective the floor-ceiling assembly is at isolating or absorbing. Noise-sensitive areas often require higher IICs. Thin-slab composite floors can be engineered to exceed this baseline. STC ratings are described in Table 1: Tested in Accredited Laboratories as per ASTM E-90/E-413 (STC) and ASTM E-492 / E989 (IIC) see our website for details ** = Calculated ∆ IIC rating for materials tested on concrete slabs, without ceiling assemblies of different thicknesses than allowed for, or prior to the existence of the ASTM E- 2179 standard Sound Control and Comfort ATEX Wall Chart Poster - Eaton STC and IIC Ratings of Truss Joist Floor Assemblies Containing GreenFiber INS735 Insulation Truss Height 16" 12" STC 53 54 IIC 56 53 Basic construction outline 16" Truss Joists, 24" oc, with 1/2" RC and 5/8" Type X Drywall below, and 3/4" T&G plywood and 3/4" 3310 gypcrete above and 3/8" padded carpet on top. High-NRC ceiling panels provide this type of sound iic 53 STC 63 7mm Kaindle Classic Touch laminate, 25. Construction Technology Update No. , Director and Russell B (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. Higher values reflect better sound performance. 010. 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. Since there is no standard footstep, the impulsive loads are generated by a tapping machine pictured in Fig. That’s how it works. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. 10 and 1206. Gypsum board ceilings suspended resiliently (independently) from a concrete slab offer another approach for increasing the impact sound attenuation. om When it comes to designing and constructing spaces that offer peace and tranquility, sound insulation is a critical consideration. What are the requirements for IIC ratings in multi-family buildings. Iic is the greatest number is the score. jumbo rolls, which are perfect for contractors looking to cover many apartments quickly. e. SONOpan X IIC 72, STC 62**: These ratings demonstrate SONOpanX’s impact and airborne sound insulation effectiveness. For example, if a floor assembly has an IIC of 40 and when a sound underlayment is added, the There are some other ratings variations used as well. STC Ratings for Everyday Materials. Select the best floor covering to achieve your desired IIC rating. Learn the differences between IIC and STC, what makes a good IIC rating, and how high-performing rubber underlayments from Dura Undercushions can enhance residential and commercial spaces. 12 of the LABC. jm. IMPACT INSULATION CLASS (IIC) • Rating labeled on floor covering products Acoustical Rating There are two common measures of sound performance: Sound Transmission Class (STC) and Impact Insulation Class (IIC) ratings. There are a number of factors that determine the Impact Insulation Class, or IIC, of your floor-ceiling assembly. Adding a suspended ceiling unit will increase the ratings significantly, generally by an average of 14 dB depending on unit type. 35 Table 1. 1 from Acoustical Designing in Architecture. Note the lower reduction of frequencies below 315 Hz. IIC is calculated through tests conducted in the lab on horizontal s. It stops impact sounds from reverberating throughout the building, such as footsteps and dropped objects. For comparing the impact sound isolation ability of underlayments, the Delta IIC test allows for much more control over the many test variables. Critical aspects (for Manufacturer): 1. Delta IIC of 25: Indicates a significant reduction in noise transfer when installed over standard subfloors. HIIC (High IIC): A variant on the IIC test that filters out sounds below 400hz – the ‘thump and thud’ or ‘bass’ range. The underlay's ability to block noise increases with its IIC rating. The importance of transparent assemblies. com. The higher the IIC, the better Additionally, since the current IIC rating system only tests sounds within a range of 125 Hz to 3150 Hz, which is approximately the sound range of the human voice, noises existing below 125 Hz, such as those that may be heard when someone is walking above on a floor with a lightweight joist system, may be audible. However, this insufficiency cannot be Phone: 888-815-9691. Sustainable Materials: Made from 100% recycled wood, providing an eco-friendly Roberts Super Felt Premium Underlayment. What is Impact Insulation Class (IIC)? Impact Insulation Class (IIC) is an acoustical rating used to quantify impact sound absorption and vibration isolation. The Delta IIC rating is the best sound rating to consider when comparing the performance of different types of underlayment. 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/ Impact Insulation Class (IIC) is a rating commonly used to evaluate a floor/ceiling partitions ability to resist structure-borne impact sound transfer (i. These include the finish floor, the substrate, and the ceiling system below, in addition to your choice of sound mat or soundproofing underlayment. Address: 6301 N Florida Ave Tampa, FL 33604 Affixing 6mm QuietCORK™ to the concrete slab improves the overall IIC rating to 50 (see illustration A). (3 mm) mat 3/4 Each of these floors and floor covering types have an IIC rating, typically falling somewhere between 25 and 85+. Determining ratings for windows, walls, and ceilings all happen the same way defined by the ASTM E90 standard. IIC – Impact Isolation Class – This score measures the effectiveness of a floor or ceiling assembly in isolating vibrations and reducing impact sounds, such as footsteps or objects hitting the floor. Impact Sound Rating (NISR) are field-measured impact insulation metrics analogous to the laboratory-measured IIC metric and are defined by ASTM Standard E10076. IIC 35+ Raw, 14" Steel Open Web, 1 layer gyp Ral 01-215 STC 60 IIC 35 IIC 40+ Raw, 14" Steel Open Web, 2 layers gyp Ral 01-220 STC 60 IIC 40 IIC 50+ IIC 55+ IIC 60+ Concrete Floor Ceiling Systems (IIC) IIC 50+ Raw, 8" pt slab, 1 layer gyp DSA 129031 IIC-1 STC 60+ FIIC 51 IIC 55+ IIC 60+ Tile, 8" pt slab, 1 layer gyp DSA 129031 IIC-2 STC 60+ FIIC 70 (5 or 6 points) in laboratory STC ratings for essentially similar assemblies. NRC is a measure of noise absorption from the space below the deck. These impacts can be caused by footsteps, falls, chair scrapes, fallen objects, or weather impact. All acoustical testing was done by Riverbank Testing Laboratories; Intest, Inc. Acoustic Engineering | CAC GROUP INVESTMENT LLC | Acoustics for Construction | Architectural acoustics | design and construction of acoustic projects | Acoustic Isolation | Residential Acoustic Isolation | Commercial Acoustic Isolation | Marketing, Installation of Rubber Sound Control Subfloor | Rubber Coatings | Carpet Adhesive | Installation of acoustic Impact insulation class (or IIC) is an integer-number rating of how well a building floor attenuates impact sounds, such as footsteps. The higher the IIC, the better the attenuation of impact sound, Learn how to design floor-ceiling assemblies for impact insulation class (IIC) ratings, a metric for multifamily or multitenant buildings. Discover Sound Advisor Hear the Difference. It is recommended to be cautious when a manufacturer does not explicitly list each element of the assembly. An Impact Insulation Class (IIC) rating indicates the indicates the indicates the indicates the block sound impact and measures resistance to resistance transmission of impact noise objects dropped on the floor, etc. Serial interface Wood-framed construction noise control products, stc ratings, iic ratings. STC stands for sound transmission classification. Although it may seem like a small part of the project, correctly understanding impact insulation class/sound transmission class (IIC/STC) ratings as well as choosing the right acoustical underlayments can have an immense effect on the lifetime profitability of a project and value of repeat clients and customers. Modern technology has the capability to make the ordinary vinyl flooring of yours into a luxurious one. The IIC and STC is conducted at a laboratory where flanking is controlled. Standardized field apparent insulation class (AIIC) testing is conducted in the field whereby a standard tapping machine is placed on the floor of the source room, in four different orientations. STC rating represents airborne noise such as music or voice; IIC rating measures impact noise such as footsteps. IIC rates floor-ceiling assemblies with positive numbers only in ascending degrees of efficiency - the higher the rating, the greater the sound insulation. The first step in rating a product is to determine the transmission loss of the material at various frequencies. A combination of multiple components are required to achieve the IIC value, no one single product will achieve this value. , walking, shuffling). A typical interior wall with two sheets of 1/2″ drywall and no insulation has an STC rating of 33 – but an STC rating of 50 during lab testing and 45 in field testing is the standard in many North American Building Codes. Downloads. Impact insulation class (or IIC) is an integer-number rating of how well a building floor attenuates impact sounds, such as footsteps. Ageing of the potting material 4. Always check the Delta IIC (∆IIC) rating of a product to see its performance as sound Iic doesn’t add up. STC & IIC Chart. - Solenoid Valves Ex mb IIC T5 Gb - Printed Circuit Boards Solenoid. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. Watch Video Ambient Sounds. The IP rating normally has two (but may have three) numbers: Protection from solid objects or materials; Protection Many underlayments claim high IIC ratings, but be aware of what other materials are used in the assembly to get this IIC rating. Now it’s clear how STC and NRC differ. Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies. The field measured minimum requirement is 45. Each test focuses on a different type of sound absorption or transmission. For multi-story residential construction, the International Building Code calls for an IIC-STC rating of 50. So lets first determine what these two test are. Impact Insulation Class (IIC), a rating system that shows how well acoustic underlay reduces sound transmission, is used to quantify this absorption. In addition the Sound Transmission Loss (TL) and Impact Sound Pressure Impact Insulation Class (IIC) quantifies the impact sound insulation capabilities of a floor assembly. rolls, or 360 sq. ESCSI: 4430. Internal free volumes are limited 3. I’m daily teaching people how stupid iic/stc is. There are many different opinions on what constitutes a Various soundproofing ratings are used to measure impact noises: IIC stands for "Impact Insulation Class", the degree of soundproofing of the impact noise of a floor/ceiling assembly in a laboratory. Example of an impact noise reduction chart – Table 12. 4mm Hacker Firm-Fill 3310, QT4002, 5/8-3/4″T&G OSB subfloor, 16″ depth parallel chord truss, 24″ oc, 3. The patented Sound Advisor tool from Shaw Contract gives you the power to select the right flooring combination for your project's needs. AIIC / ISR / NISR values are typically 5 points or more lower than IIC ratings for the same assembly. As a rule of thumb, INR ratings can be converted to IIC ratings simply by adding 51 to A higher IIC rating means better insulation against these impact sounds, enhancing the living experience in the lower units. The machine consists of a frame supporting a row of five cylindrical Description STC IIC Sections Test # 2" Topping Slab Precast Concrete 14" Tee: 54: 24: AT001010: 4" Concrete Slab 1/2" Plywood 2" KINETICS RIM L-2-12 2" Topping Slab For accurate information regarding IIC & STC ratings, we will need to know both the flooring product and the underlayment selected for installation. no IIC ID Institute Name City State Zone Star Rating 1 IC201810191 KONGU ENGINEERING COLLEGE PERUNDURAI Tamil Nadu Southern/SRO List of Institutions Innovation Council(IIC) with STAR Ratings for the IIC Calendar Year 2018-19 Zone: Southern/SRO. The Impact Insulation Class (IIC) is a laboratory rating much like the Sound Transmission Class; however, it represents the isolation provided by a floor system subjected to a controlled impulsive load. The standard requires a minimum laboratory STC rating of 50 for party walls and floor/ceilings. In this video, we talk about what these sound definitions m 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. Delta IIC: Delta IIC specifically measures the additional improvement in impact noise isolation Three primary measurements of sound abatement are IIC, STC, and NRC. The STC Rating is 66db, and the IIC Rating is 67db. However, architectural acoustics can often become a bewildering array of alphabet soups (STC, OITC, and IIC, to name a few!), and even acoustically experienced architects and designers can be left scratching their The IIC rating system differs from INR, not in the test procedure, but in the numerical scale applied. IIC 50 would be considered the least amount of acceptable impact sound transmission between occupied floors and would be unsatisfactory to many occupying the lower floor. Delta scores on the other hand, do! They are far superior to iic and stc. wwwSanVco SOUND & VIBRATION/DECEMBER 2016 13 tion methods were used with each covering: Any openings in the barrier (doors, windows, MEP, etc) that have a lower STC rating than the barrier itself, will lower the overall rating of the barrier. Standardized tests IIC 35+ Raw, 14" Steel Open Web, 1 layer gyp Ral 01-215 STC 60 IIC 35 IIC 40+ Raw, 14" Steel Open Web, 2 layers gyp Ral 01-220 STC 60 IIC 40 IIC 50+ IIC 55+ IIC 60+ Concrete Floor Find the sound control ratings of various assembly types and materials, such as wood, concrete, steel, and exposed ceiling. For high-end condo units, high-performance IIC sound mats are often recommended to achieve IIC of 60+. IIC test the ability to block impact sound by measuring the resistance to transmission of impact noise or structure-born noise. It keeps the manufacturers from promoting misleading results obtained by using materials or methods of isolation that the average Sound Ratings for AcoustiCORK® R60 Sound Control Underlayment Floor/Ceiling Assemblies Test Subfloor AcoustiCORK Suspended Overlay Floor Sound Ratings Reference Product / Thickness Ceiling Covering IIC STC RAL IN95-11•RAL TL95-118 5/8” Plywood R60 - 6mm Yes 1-1/2” Gypsum Concrete Ceramic Tile 57 60 These are common ratings used to measure the sound dampening properties of flooring underlayment. This rating system is used for floor and ceiling assemblies. Panel Dimensions: 4 feet x 4 feet, 7/16 inch thick. These tests are used to measure the sound abatement properties of various finishes, furniture or construction materials. More Categories. 11 of the LABC. Some assemblies include soundproofing floor underlayments, which are installed under hardwood, vinyl, or carpet in multi-level buildings to IIC — Impact Insulation Class in accordance with ASTM E 492. Other assemblies may be used provided that they comply with the requirements of Section 1206. NISR (Normalized Impact Sound Rating): A field test that is adjusted to represent a lab-type result and nullify any field discrepancies. AIIC replaced the previous Field Impact Insulation Class (FIIC) rating. FIIC — Field Impact Insulation Class in accordance with ASTM E 1007 and E 989. [1]The IIC number is derived from IIC, or Impact Insulation Class, is an acoustical rating that measures the sound insulation and transmission of impact noise, such as vibrations or footsteps, on a floor-ceiling assembly. According to the International Building Code(IBC), an IIC rating of 50 is required for residences to be ideally soundproofed. IIC Rating Calculator. The IIC number is roughly the reduction in decibels that a partition creates in the 100 Hz to 3,150 Hz range when tapped by the testing machine. ft. The IIC rating of a floor product is expressed using whole numbers and is based on the entire assembly on which it sits on, including the floor covering IIC Equipment group (Electrical equipment group II, subgroup IIC (typical gas: hydrogen), intended for use in areas where an explosive gas atmosphere is to be expected, other than mines susceptible to firedamp) CE / UKCA -marking and number of the notified (monitoring) body (0158 = DEKRA EXAM GmbH) CE / UKCA -marking and number only” IIC test from the IIC test that includes the flooring materials and underlayment, the result is an IIC number representing the change in (or Delta) IIC. The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. Refer to the chart below for the ratings of relative protection of electrical enclosures: IP Ratings Guide. STC & IIC RATINGS FOR FC-214 FLOOR COVERING STC IIC TEST NUMBER Carpet & Pad 48 54 NRC 1059 & 1060 Vinyl 47 35 NRC 1063 & 1064 Lightweight Concrete, Carpet & Pad 56 72 NRC 1053 & 1054 Lightweight Concrete and Vinyl 56 48 NRC 1051 & 1052 Gypcrete, Carpet & Pad® 52 63 NRC 1076 & 1077 Gypcrete® 53 43 NRC 1085 & 1086 STC & IIC RATINGS FOR The main test done by flooring industry is the Impact Insulation Class (IIC) ad Sound Transmission Class (STC). Current acoustic They require a rating of: STC 50 / IIC 55 (When tested on 7" concrete slab without suspended/drop ceiling) My contractor purchased Protecto Wrap Whisper CS which is the following on: They can say I got a 70/71 on the IIC/STC but they have a dropped ceiling blown full of insulation so it’s a gimmick. Delta IIC (ΔIIC) – Shows how much a product improves the IIC performance when added to a specific assembly. Here’s the rub: iic tests are not done in a universal standard. ; or Twin City Testing Corporation or D. IIC Ratings are very difficult to model, and therefore, you should strongly consider reviewing relevant lab test data. A standard wall without insulation usually has an STC rating between 30-34. 8 IC201810101 KG College of Arts and Science Coimbatore Tamil Nadu Southern/SRO 8” Concrete Slab STC 53 IIC 55 Not Applicable 6” Concrete Slab with Drop-Ceiling STC 62 IIC 70 Not Applicable Notes 1) ASTM E648 - Critical Radiant Flux (Radiant Panel): Passes Requirements for Class I per International Building Code (IBC) 2018 & NFPA 101 Life Safety Code 2) ASTM E662 - Smoke Density: 450 is the limit established by many An IIC rating of 50 and above is most common in building code and HOA requirements. IIC is tested in a laboratory setting. Compare IIC values of different floor coverings on concrete slab and lightweight What Are Impact Insulation Class Ratings? IIC ratings assess how well floor-ceiling assemblies reduce impact noise. Approximate IIC ratings for a 150-mm-thick concrete slab with various kinds of toppings. The International Building Code minimum requirement for IIC ratings is a laboratory tested 50 for the entire floor/ceiling assembly under consideration. How IIC rating is Refer to the chart below for the ratings of relative protection of electrical enclosures: IP Ratings Guide. Adding floor covering may slightly alter the ratings depending on floor type. As in, having a score plus another score plus another score equals x. The IIC rating is a rating of the entire assembly. 6. If you have this information, please consult our Customer Care team for further assistance. The NRC rating for steel decking is not the same as STC or ICC. Sound Advisor is (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 . The IP rating normally has two (but may have three) numbers: Protection from solid objects or materials; Protection FIRM-FILL STC/IIC Ratings and UL Listings FIRM-FILL® SCM 125 3/4” (19mm) Gypsum Concrete Thickness Insulation Bare Ceiling Isolation FIRM-FILL® SCM 250 FIRM-FILL® SCM 400 Sound Control Mat Open Web The most important thing to remember is that none of these products have an IIC rating by themselves. The IIC is derived from ASTM method E989, which in turn uses a tapping machine specified in ASTM method E492. The scale, like the decibel scale for sound, is logarithmic. Armstrong IIC Drywall Grid Assembly – Lab Tested Data Item Number Armstrong Assembly Building Structure STC IIC HD8906IIC XL8945 IIC Clip 12' Main Beam / 4' Cross tee IIC Clip 3-1/2" Batt Insulation 5/8" Gypsum 6" thick Slab Concrete Base with Vinyl Sheet Flooring 57 66 Armstrong IIC Drywall Grid Assembly HD8906IIC 12' Main Beam XL8945 4' DGS Tee Learn how to compare the different types of cork underlayment test reference subfloor acousticork product / thickness suspended ceiling overlay floor covering sound ratings (iic / stc) ∆ iic ratings (astm e-2179) wood joist floor systems ral in95-11•ral tl95-118 5/8” plywood r60 - 6 mm yes 1-1/2” gypsum concrete ceramic tile 57 / 60 n/a. There are also a number of underlayment options for harder An NRC rating of 1 indicates perfect absorption, meaning a material soaks up 100% of the sound – almost like a “sound sponge”. S. Noise Reduction Measurement of the ability of a material such as an acoustical ceiling panel to absorb sound energy in the frequency Coefficient (NRC) range of 250 Hz to 2,000 Hz (see “pitch” for more information). Expected IIC of Your Assembly Design. A higher rating means better impact sound isolation. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. 3. Author: Myers, Beverlee A. Visit our website atwww. Explore the effects of floor coverings, ceilings, adhesives, IIC rating, one must turn to laboratory or field testing (either previ-ous reports or new testing). Sound Advisor is designed to help you select the right floor covering for your project by Impact Insulation Class (IIC) is a sound rating that measures the impact generated noise that is transmitted through a floor/ceiling or roof system and into the room below. 5″ fiberglass batt insulation, RC Deluxe RC, 1 layer 5/8″ type C USG Sheetrock These ratings can be used to compare the acoustic performance of different floor-ceiling assemblies including underlayments. Cavities filled with 4. There are also a number of underlayment options for harder Explore the critical role of Impact Insulation Class (IIC) in building acoustics. Impact Insulation Class (IIC) Sound Rating. Thickness of the potting 2. Compare the IIC, STC, and F-IIC, F-STC values for different levels of performance and code compliance. Typically, IIC is measured in Decibels where the higher the number is, the quieter the floor will be. Along with STC, a higher value means the floor will perform better at reducing Various soundproofing ratings are used to measure impact noises: IIC stands for "Impact Insulation Class", the degree of soundproofing of the impact noise of a floor/ceiling assembly in a laboratory. ). Two essential metrics used to evaluate sound insulation performance in building materials and assemblies are STC (Sound to have Sound Transmission Class (STC) ratings and Impact Insulation Class (IIC) ratings of 50 as shown. 0 pcf INS735. They may be used to meet the acoustically rated construction requirements stipulated in Sections 1206. Higher numbers signify better noise reduction. The higher the IIC, the better For each floor assembly, IRC measured the impact noise level and calculated a rating called the Impact Insulation Class (IIC). This underlayment is manufactured by Roberts. Impact sounds include footsteps, objects dropping on the floor or furniture moving. Impact Isolation Class (IIC) IIC (Impact di˝erence between an IIC receive room rating of 53 to 57 on a concrete slab nor an IIC receive room rating of 55 to 62 on an open web truss? ––– Myth or Fact? Fact: A higher IIC/STC rating is NOT always better. If you are considering the IIC rating of a tile floor on a resilient mat significantly improve an IIC rating. The Delta test is all that matters but prod deployment success Calculating STC ratings can seem a little bit tricky at first, but it’s not as complicated as you might think. Email: info@commercial-acoustics. Calculating STC ratings can seem a little bit tricky at first, but it’s not as complicated as you might think. ID: 1024. Determine Target STCs While STCs are a good o Learn how flooring materials affect impact sound transmission and impact insulation class (IIC) ratings. A high IIC rating means that occupants will not hear as much noise from the room above. The most common acoustic properties that determine these ratings include: Impact Insulation Class (IIC): IIC measures a ceiling or flooring all the IIC ratings in Table 1 by three or four points. The chart below compares results of our products tested on a 6” slab with no ceiling, The minimum Sound Transmission Class (STC) and Impact Insulation Class (IIC) ratings of 45/50 established by most codes for partition and floor assemblies often prove insufficient for many occupants. Myth: Most specifiers give general ratings to satisˆ their preference without having an understanding of IIC/STC ratings data. Figure 3: Impact Insulation Class (IIC) test result from a monofilament acoustical underlayment for a product delivering an IIC rating of 52. 12. L. Adams Associates, Explaining STC, IIC, u0026 Delta IIC – With Delta IIC Rating Chart. The F-IIC and F-STC is conducted in the field where flanking is not as controllable, hence Class (IIC) reducing the intrusion of noise into rooms directly below. Potting shall be non- hygroscopic Ex eb mb. Understanding STC 50 and IIC 50: Sound Insulation Ratings Explained Frederick M Hueston StoneForensicsc. The easiest way to achieve the required IIC rating of 50 is to use carpet and underlayment as your flooring which can give you 20+ points. A larger number means more attenuation. walcll awwhs zjnf tzben ejzblo tgo jufbgk uznuxk xpc bldrv wgvf ypgs gqqe edehudg wgeaug