Thermal insulation stc rating chart mineral wool) blown-in cellulose and fiberglass batt. And the STC rating of 38-42 dB is said to be good soundproofing. Fiber glass specified when insulation is installed with pneumatic equipment in accordance with CertainTeed recommendations. The insulation must be used in areas where the maximum service temperature is no greater than 180°F (82°C). Spray foam insulation and cellulose insulation – Achieve an NRC of . 77” GAF" Polyisocyanurate 1. 4 dB Assembly Components Membrane: Insulation: Insulation Deck: 0. STC Ratings with insulation without insulation with insulation without insulation; Wood Frame 2 x 4 (3½"– 4" Batt), 16" O. An STC rating measures how much noise is stopped by something. National Fenestration Rating Council. ProPink® Wall Insulation System: Glass fiber blown loosefill thermal insulation installed in wall or ceiling Thermal Insulation, Mineral (Glass) Fibre, for Buildings (supersedes CSA A101-M1983); Type 1, pre-formed insulation † CAN/ULC-S102, Standard Method of Test for Surface Burning Characteristics of Building Materials and Assemblies placed on each side of a concrete or concrete masonry unit walls (party walls, stairwells, service rooms, etc. tions, R-values and layers of insulation. Climate Pro B7700 Mid-Floor Coverage Chart STC Rating Documents. 4 %âãÏÓ 4 0 obj > endobj xref 4 47 0000000016 00000 n 0000001461 00000 n 0000001569 00000 n 0000002647 00000 n 0000002826 00000 n 0000003001 00000 n 0000006400 00000 n 0000008833 00000 n 0000009407 00000 n 0000012179 00000 n 0000012776 00000 n 0000013321 00000 n 0000015690 00000 n 0000017952 00000 n 0000020711 00000 n 0000021098 00000 n 0000021593 00000 n 0000023726 00000 n by ROCKWOOL Insulation. Owens Corning ™ Fiberglas Light Density Building Insulation Products: • PINK Fiberglas™ Thermal Batts & Rolls Insulation • PROPINK Fastbatt® Insulation K-13 thermal insulation is a spray-applied thermal and acoustical insulation typically used as an exposed ceiling spray insulation, requiring no additional barriers or materials. Foam board insulation can be used in a variety of home & building applications. This rating system is called STC, sound transmission classification. Knauf acoustical/thermal insulation can improve STC ratings in wood stud construction by 3 to 5 points depending upon the complexity of the wall configurations, Feb 18, 2022 · STC Rating of Fiberglass vs Rockwool (Which one insulates the best) Note: Here I will be going over which type of insulation material works best when put inside a typical interior wall with ½” of drywall on either side, which has an STC rating of 34 on its own, and how it increases this rating. ). Our wall assembly was STC: 45 Report No. The higher the STC rating, the more effective the material is at reducing sound transmission, and the better the insulation. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. It will not develop smoke or promote flame spread, even when directly exposed to fire, as most other insulation materials will. Spray foam doesn’t have enough mass to improve transmission loss, and because the foam secures wall components together instead of decoupling them, vibrations from impacts can more easily move through the wall. RAL-TL90-195 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 5 A single number rating is used to measure a structure’s ability to impede sound transfer. 70 Conforms to the requirements of ASTM E84 and is classified as a class 2 (B) material. 2, Standard Test for Surface Burning Characteristics of Flooring, Floor Coverings. 6 ‘Sound insulation’ in Volume Two for Class 1 buildings. 05” Sarnafill" Sikaplan 1. Acoustics can be measured by Sound Transmission Class and the rating determines what others can hear on the other side of the wall. k. ) versus the other side of a building’s surface. Owens Corning™ Fiberglas™ Insulation contributes to the categories listed below. #89140-1 PCI2020 022420 (Repl. The first row lists the improvement in STC rating with insulation as compared to an uninsulated wall. 2. That’s why Thermafiber® is the #1 specified brand of commercial mineral wool. 4 Compressive Strength, minimum (lb/in2)4 ASTM D 1621 25. In the following 13 commercial wall systems, ROCKWOOL AFB® delivers COMPREHENSIVE INSULATION . How STC rating is measured: STC Rating • IIC Rating: 51-71 • STC Rating: 50 - 55 • Decreases step sound in rooms • Suitable over concrete and wood subfloors • 100 sq. 20 0. 6,578,782 EPA Reg. To determine this, there are a few things you need to know about sound transmission — STC and NRC ratings. C. 85” GAF" Polyisocyanurate 2. APPROVALS Monoglass has undergone numerous tests over the past 35 years and meets the following standards for Non-Combustibility: R-21 EcoTouch ® insulation is designed to eliminate R-value loss caused by compressing standard R-19 Fiberglas™ insulation into 2x6 exterior walls. STC Rating Chart. 0 Flexural Strength (lb/in2 min)5 Acoustic and Thermal Performance STC: 26 OITC: 21 RValue: 23 Rainfall: 54. Comprehensive guide on acoustical assemblies and STC ratings for insulation systems, commercial roofing, and engineered products. • Part 3. In the fi eld, fl anking noise, quality of material and construction practices can lead to widely varied STC’s for the same assembly. The tables below show STC ratings of the same wall assemblies with either fiber glass or rockwool filling the cavity. 5½ " thick R-21 EcoTouch® insulation delivers 19% more R-value than compressed 6¼ " R-19 Fiberglas ™ insulation. What is STC? The Sound Transmission Class (STC) is a single-number rating of an assembly’s ability to resist airborne sound transfer at the frequencies 125-4000 Hz. The higher the STC value, the better the rating and the better the performance as shown in Figure 3 and Figure 4. STC ratings are determined in a laboratory under controlled conditions. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. • The tables show STC ratings of the same wall assemblies with either fiberglass or rockwool filling the cavity. 00 10 (with NRC, higher is better). Owens Corning™ EcoTouch® Insulation with PureFiber® Technology is fl exible light density insulation with a variety of facings and uses for thermal and acoustic benefi t. In the U. STC RATINGS With insulation No insulation With insulation No insulation Wood Frame, 2 x 4 (3½" – 4" Batt), 16" O. Jun 4, 2024 · STC Rating Chart. FIBERGLASS AND MOLD Fiberglass insulation will not sustain mold growth. Technical Information • The kraft facing on this insulation will burn and must THERMAL INSULATION AND AIR BARRIER ESR-1826 Specification Sections: 07 21 19 Foamed-in-Place Insulation, 07 27 00 Spray Polyurethane Foam Air Barriers PRODUCT DESCRIPTION Icynene Classic Ultra Select™, which replaces Icynene Classic Max Select, is a spray-in-place low density, open celled, flexible, nominal BCA. 8; Sound insulation and sound absorption. 51” Fabral 22ga. jm. acoustical/thermal insulation can improve STC ratings in wood stud construction by 3 to 5 points and metal stud construction by 8 to 10 points depending upon the complexity of the wall configurations, R-values and layers of insulation. , Type B, Steel Acoustic and Thermal Performance STC: 29 OITC: 23 RValue: 23 Rainfall: 55. Comfortboard ® 80 Exterior Continuous Insulation Issued 11-2024 DOE Guide to Insulation and DOE Guide to Air Sealing. Rev 12/2018-24 Page 2 of 3 ASTM E84 STC 35 NRC. 4 ‘Health and amenity’ in Volume Two for Class 1 buildings. BASIC USE: Thermal conductivity - “k”3 (Btu x in/hr x ft2 x °F) @ 75°F mean temperature @ 40°F mean temperature ASTM C 518 0. Additionally, Celbar assemblies tend to perform closer to lab-tested STC ratings in the field over alternative insulation systems due to the complete coverage and sealing action of Celbar. Rev 1/2018-5 Page 2 of 3 ASTM E84 STC 35 NRC. The STC Ratings table on the following page illustrates the improved STC Ratings in a commercial Board Insulation 07210* Board Insulation 07 21 13** ROCKWOOL Comfortboard® 80 is a rigid stone wool board designed for continuous insulation applications. Filling the stud cavities with fiberglass raises the STC rating to 39. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. Uninsulated ductwork exhibits poor sound dampening and acoustic Fiberglass Batt (Blanket Insulation) Generally used with layer thicknesses meeting r-value insulation chart targets (e. ft per roll • 1. 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. The higher the STC rating, the better the building reduces sound transmission. Sound Transmission Class (STC) is a single number rating used to compare various partitions or assemblies for their ability to reduce the amount of sound traveling through the assembly. a. nfrc. The higher the STC rating, the more effectively a wall, floor, or ceiling controls sound transmission. 4 mm thick HUSH II – 170VS • LVT/LVP Underlayment • IIC Rating: 51 • STC Rating: 56 • Decreases step sound in rooms • Suitable over concrete and wood subfloors rock, with a thermosetting resin binder. A non-structural sheathing product, Comfortboard® 80 provides increased thermal performance to the building envelope. Knauf acoustical/thermal insulation can improve STC ratings in wood stud construction by 3 to 5 points and metal stud construction by 8 to 10 points depending upon the complexity of the wall configurations, R-values and layers of insulation. S. Visit our website atwww. Typically a two (2) or more point change With GreenFiber Insulation The three most important ratings used in building assembly testing are: † STC (Sound Transmission Class) – used to rate air transported sound transmission between two areas separated by an interior wall or in comparing the sound transmission ratings of building assemblies using different materials: To provide ideal acoustics in an area, you need the right insulation for sound control. Mineral Wool STC BID@$"/@ 4/1 201 ohns Manville All Rihts Reserved Visi our ebsie a www. Glass size and glazing system will affect STC rating. Independent laboratory tests show improved Sound Transmission Coefficient (STC) properties with PINK® Fiber Glass Sound Transmission Class (STC) Ratings. RAL-TL90-195 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 5 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. Of course, the higher the STC rating, the better. The higher the STC number, the greater the reduction in sound. However, Commercial Thermal Solutions, Inc. Mar 30, 2023 · Filling that gap with STC rated insulation, like CFAB Cellulose-Based Acoustical & Thermal Panels will increase the STC rating even more. Fiber glass insulation and mineral wool insulation – Noise Reduction Coefficient (NRC) of up to 1. Kraft-faced Thermal Batt Insulation complies with ASTM C 665, Type II, Class C. Don’t forget the ducts. Shop for Performance. 2. Check out the below chart to discover how combinations of drywall layers, framing and type of insulation compare for STC (Sound Transmission Class) ratings. Jul 24, 2023 · Each one-point increase in an STC rating represents a one-decibel noise reduction. Below the chart we provide additional brief description of each material type. For Windows Facing: Cold Climate. The following table illustrates the improved STC Ratings using Knauf QuietTherm acoustical/thermal insulation compared to no insulation. 4917) PEST CONTROL INSULATION, LLC 5285 Mountain Center Sound Transmission Class (STC) Ratings. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. Find resources and details for UL rated wall systems with the required STC and fire ratings for your project. STC (Sound Transmission Class) ratings represent the ability of an assembly to reduce sound decibel levels transferred through walls, ceilings and Aug 18, 2022 · As you can see from the chart above, neither insulation has a significant impact on the STC rating of a 2x4 partition wall. Download our comprehensive chart, featuring STC ratings for commonly used materials >> Several factors contribute to determining how much sound absorption material a space needs. Product can also be installed within a floor assembly to enhance acoustical properties of the assembly. Thermal Insulation, Mineral (Glass) Fibre, for Buildings (supersedes CSA A101-M1983); Type 1, pre-formed insulation • CAN/ULC-S102, Standard Method of Test for Surface Burning Characteristics of Building Materials and Assemblies • CAN/ULC S102. Improve building performance rating compared with the baseline building performance rating, calculated per Appendix G of ANSI/ASHRAE/IESNA Standard 90. In general, a higher STC rating blocks more noise from transmitting through a partition. Insulation Building Insulation HVAC Insulation Class (STC) ratings demonstrate its effectiveness in attenuating noise. Oct 10, 2024 · STC RATING CHART: STC: What can be heard at this level: 25: Soft speech can heard and understood: 30: Normal speech can heard and understood: 35: Loud speech can heard and understood: 40: Loud speech can heard, but not understood: 45: The threshold at which privacy begins: 50: Loud sound can be heard, but are very faint: 60+ At this level, good (except thermal performance and marking) of CAN/ULC-S702-97, Standard For Mineral Fibre Thermal Insulation For Buildings,Type 1 (issued September 1997 and supersedes CSA A101-M1983), properties. (with ½" gypsum wallboard both sides) (with 5⁄ 8" Type X gypsum wallboard both sides) Single studs/Single layer gypsum 38 35 38 34 Single studs/Resilient channel 47 39 50 40 Staggered studs/Single layer gypsum 49 39 51* 43 being considered in assessing compliance with the LEED Rating System within a given category and credit. Tested at 4 inch thickness The STC rating indicates how well a wall assembly blocks airborne sound. 4. What is R-value? We will look into what does R-value means, how it is calculated, what are the minimum recommended values of R for attics, 2×4 and 2×6 walls, and so on (you will find a complete insulation R-value chart further on), and what it’s so important to pick building materials with high R-values. If properly insulated with minimal compression, it delivers reliable thermal resistance for heating and cooling efficiency. Foil-faced Thermal Batt Insulation complies with ASTM C 665, Type III, Class B and C. flow — insulation's thermal resistance STC RATINGS With insulation No insulation With insulation No insulation Wood Frame, 2 x 4 (3½" – 4" Batt), 16" O. Cellulose Insulated Wall: 44 STC Fiberglass Insulated Wall: 39 STC Uninsulated Wall: 35 STC US Patent No. 18 Thermal Resistance - “R”, minimum (°F x ft2 x h/btu) @ 75°F mean temperature @ 40°F mean temperature ASTM C 518 5. They provide exceptional thermal and acoustical performance, and help to delay the spread of fire. 8. K-13’s monolithic coating absorbs excess noise and provides an R-value of 3. This chart summarizes various characteristics of five most common house insulation materials: closed cell spray foam, open cell spray foam, rock wool (a. Typically, a 2 x 4 wall with drywall on both sides has an STC value of 34. Request CertainTeed’s Sound Control Guide (30-29-121) for more information on the Sound Transmission Class (STC) Ratings. (with ½" gypsum wallboard both sides) (with 5⁄ 8" Type X gypsum wallboard both sides) Single studs/Single layer gypsum 38 35 38 34 Single studs/Resilient channel 47 39 50 40 Staggered studs/Single layer gypsum 49 39 51* 43 E413-87 in an acoustical wall. EXPERTISE AND SUPPORT JM TechConnect. Installing batt, roll or blown-in fiberglass insulation in a building will noticeably improve STC ratings. 75. , r-30, r-38). K-13 has a Natural Texture and is available in seven standard colors and specially-matched custom colors. com or call 1-800-654-3103 | Building Insulation Division Bo | ener C Tecnical speciicaions as son in is lieraure are inended o be used as eneral uidelines only Te pysical and cemical properies o ermal STC RATINGS With insulation No insulation With insulation No insulation Wood Frame, 2 x 4 (3½" – 4" Batt), 16" O. Adding treatments inside the room will help stop noise volumes inside the room from increasing too much, but making meaningful changes to your STC rating generally involves making some structural changes. STC above 50 is said to be very good and is often achieved for commercial projects. The higher the STC value, the better a construction reduces the transmission of sound. RAL-TL90-195 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 5 Wall Assemblies with thermal batts provide Acoustic Ratings (STC) that are very similar to ratings of Wall Assemblies with Acoustic Batts. The BCA has sound insulation provisions for residential buildings in the following parts - • Part F5 ‘Sound transmission and insulation’ in Volume One for Class 2, 3 and 9c buildings. g. • Part 2. Unfaced Thermal Batt Insulation complies with the property requirements of ASTM C 665, Type I and ASTM E 136. K-13 meets project requirements for thermal insulation, noise control with an attractive natural texture that is available in standard and custom colors. access comprehensive insulation knowledge and installation advice from our dedicated technical experts – in person, by phone or online. Count on JM to consistently deliver reliable, high-quality mineral wool insulation products that surpass expectations and support occupant comfort and well-being. 3 Classic Plus: The insulation may be used in areas STC Rating 50: STC Rating 53 Thermal Properties: INSULATION VALUE: CONSTRUCTION "U" VALUE "R" VALUE: Foam in CMU Cores Apr 7, 2017 · STC What can be heard; 0: No insulation barrier: 36: Blown-in fiberglass insulation: 36: Batts of fiberglass insulation: 41: Closed cell spray foam insulation: 45: Blue jean denim insulation: 50: Rock wool batt insulation: 50: Open cell spray foam insulation When checking insulation specs sheets, R-value comes up quite often. Some building materials are specially chosen for the fact that they already incorporate insulation into their design. RAL-TL90-192 Insulation Included: ROCKWOOL AFB STC 46 Assembly Components Finish material 1/2” gypsum Size 3 5/8” Steel Stud Spacing 24” oc Product AFB Thickness 1. Jul 21, 2000 · Celbar provides superior sound transfer control demanded by building designers, owners, and occupants. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. Connect with us at Structural materials with insulation properties. Higher STC ratings indicate better performing sound insulation. Federal Insulation Thermal Batt Insulation Specification HH-I-521F has been canceled and is replaced by %PDF-1. 0 5. (with ½" gypsum wallboard both sides) (with 5⁄ 8" Type X gypsum wallboard both sides) Single studs/Single layer gypsum 38 35 38 34 Single studs/Resilient channel 47 39 50 40 Staggered studs/Single layer gypsum 49 39 51* 43 Transmission Class (STC) ratings demonstrate its effectiveness in attenuating noise. is the sound transmission class (STC). MinWool SAFB Insulation is designed Knauf Insulation acoustical/thermal insulation can improve STC ratings in wood stud construction by 3 to 5 points and metal stud construction by 8 to 10 points, depending upon the complexity of the wall configurations, R-values and layers of insulation. Use this STC rating chart as a rough guide to the different STC ratings for soundproofing materials: 25: There is no functional soundproofing, and quiet conversations can easily be overheard; 30: Quiet speech is muffled, but conversations at normal volumes are audible; 35: Loud speech is clearly audible Sound Transmission Class (STC) is a single number rating used to compare various partitions or assemblies for their ability to reduce the amount of sound traveling through the assembly. 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/ STC: 45 Report No. Metal Building Insulation helps reduce building energy demand while improving thermal comfort significantly improve an IIC rating. www. 1Higher R-values mean greater insulating power. Get the details needed to use FOAMULAR® NGX® 250 XPS for your next project. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. *OITC is estimated based on this test. Thermal resistance is based on thickness of insulation installed, values are noted in Application chart from the product data sheet. Jul 1, 2024 · Structural fireproofing and Monoglass thermal/acoustic insulation combine to achieve required fire ratings, thermal values and acoustic properties on steel or concrete structures. (with ½" gypsum wallboard both sides) (with ⅝" gypsum wallboard both sides) Single studs/Single layer gypsum: 38: 35: 38: 34: Single studs/Resilient channel: 47: 39: 50: 40: Staggered studs/Single layer gypsum: 49: Jul 1, 2024 · Structural fireproofing and Monoglass thermal/acoustic insulation combine to achieve required fire ratings, thermal values and acoustic properties on steel or concrete structures. According to the Insulation Institute, noise has been identified as causing physical and psychological stress on occupants. 1-2007 a whole project simulation model, with points awarded per energy cost savings in LEED table. Find out why in the STC: 45 Report No. The intent is to categorize the relative performance of an assembly in impeding or attenuating sound energy as it passes through the […] Commercial Thermal Solutions, Inc. 10; Fire Protection. For the utmost comfort, Thermafiber® mineral wool insulation is the standard. 7 dB STC RATINGS With insulation No insulation With insulation No insulation Wood Frame, 2 x 4 (3½" – 4" Batt), 16" O. The STC rating has been in existence for many years and is based on speech sounds. Request CertainTeed’s Sound Control Guide (30-29-121) for more information on the Fire Rating: 1 hour Sound Transmission Class (STC): 52 Interior Ceilings/Floors (2 x 10 Joists – 16” On Centre) 6" Safe'n'Sound®, 5/8” drywall (type x) and resilient channels at 24” provides: Fire Rating: 30 minutes Sound Transmission Class (STC): 50 Interior walls between rooms Ceilings between fl oors Maximize the peace & quiet In fact, on the authority of the Insulation Institute, fiberglass insulation in interior walls and floors/ceilings can improve sound reduction. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. Outdoor-Indoor Transmission Class What is STC? STC ratings measure sound level on one side of a building’s surface (wall, ceiling, window, etc. K-13 is a Thermal and Acoustical cellulose insulation used as an insulation/ exposed finish for its acoustic and thermal benefits. Fiberglass and Mold Fiberglass insulation will not sustain mold growth. Overall, the objective is to achieve a balance that considers the environment’s particular acoustic features. Wall Assemblies with thermal batts provide Acoustic Ratings (STC) that are very similar to ratings of Wall Assemblies with Acoustic Batts. 75 per inch. Our wall assembly was 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. These include structural insulation panels (SIPs), straw bales and autoclaved aerated concrete (AAC) blocks. org. STC is measured in decibels. (with ½" gypsum wallboard both sides) (with 5⁄ 8" Type X gypsum wallboard both sides) Single studs/Single layer gypsum 38 35 38 34 Single studs/Resilient channel 47 39 50 40 Staggered studs/Single layer gypsum 49 39 51* 43 Thermafiber® SAFB™ (Sound Attenuation Fire Blankets) are mineral wool batts that provide sound control and fire protection in wall and floor-ceiling assemblies The acoustical performance of a wall assembly is measured using a single number rating system, where the higher the number the better the performance. SM . The insulation must be applied when the temperature is at or above 14°F (-10°C) and be protected from the weather during and after application. Thermafiber® SAFB™ (Sound Attenuation Fire Blankets) are mineral wool batts that provide sound control and fire protection in wall and floor-ceiling assemblies Commercial Thermal Solutions, Inc. Technical Information • The kraft facing on this insulation will burn and must STC RATINGS With insulation No insulation With insulation No insulation Wood Frame, 2 x 4 (3½" – 4" Batt), 16" O. Fire-safe insulation for wall assemblies – won’t burn or develop smoke ROCKWOOL Comfortbatt® stone wool insulation is non-combustible as determined by fire tests ASTM E 136 and CAN4-S114. (with ½" gypsum wallboard both sides) (with 5⁄ 8" Type X gypsum wallboard both sides) Single studs/Single layer gypsum 38 35 38 34 Single studs/Resilient channel 47 39 50 40 Staggered studs/Single layer gypsum 49 39 51* 43 EcoRoll insulation provides excellent acoustical properties and will reduce sound transmission when properly installed in partition walls and acoustical ceiling and floor systems. Cellulose insulated wall: 44 STC Fiberglass insulated wall: 39 STC Uninsulated wall: 35 STC applegateinsulation For every house is builded by some man; but he that built all things is God. Therma-Tru STC-rated Noise Reduction doors deliver aesthetics with a commercial level of performance for residential projects. 5” AcousticsAcoustics Assembly Number: ISS-11 STC: 46Report No. Filling the same cavities with 3 ½” mineral wool raises the STC rating to 45–among the highest for batt insulation. Sound Transmission Loss The same STC ratings obtained with fiber glass blanket insulation can be estimated for InsulSafe SP in BIBS application. Unfaced Thermal Batt Insulation complies with ASTM C 665, Type I and ASTM E 136. is the single source for JM customers to . Thermal Resistance Thermal resistance (R-value) of the blanket insulation only is certified to be as repre- Spray foam insulation – Achieves an STC of 37-39. However, mold can STC RATINGS With insulation No insulation With insulation No insulation Wood Frame, 2 x 4 (3½" – 4" Batt), 16" O. We can help you quickly solve even the most complex insulation challenges. JM. Even then, differences of 1-2 points STC can occur for the same assembly in the same laboratory. xflts lulmw vtam lfh kixlop zuede wlrf kranghs drw nhlhsnl slyhei uphtcr owbn zozz ejztb