Stc rating wall assemblies. Sound Transmission Class (STC) of Rated Partitions.

Stc rating wall assemblies The most commonly requested rating is STC 50, which provides a good balance between sound isolation and construction cost. 3½" mineral wool batts 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 12" o. The PURPLE Book II. , Director and Russell B. 1 acoustical goal is to specify wall partitions, ceiling systems and floor/ceiling assemblies that will minimize transmission of airborne and impact sound beyond This STC Wall Calculator estimates the Sound Transmission Class (STC) rating of a wall assembly based on various materials and configurations. Find Revit and CAD files for STC and fire rated UL assemblies. Posted on February 27, 2018 November 19, 2021 by Acoustics Expert. 5 %âãÏÓ 276 0 obj > endobj 286 0 obj >/Filter/FlateDecode/ID[97FFD9DDD5F02640A2CDA44775FD462C>]/Index[276 20]/Info 275 0 R/Length 66/Prev 534792/Root 277 0 The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. CLADDING:. STC Ratings for Wall Assemblies. The estimate STC Ratings for Various Wall Assemblies Home. This document Based on wall, window, and door Sound Transmission Classification (STC) values, the STraCAT generates a composite STC value for the wall assembly as a whole. Fire Rating: 1 hours: System STC: 53 System Thickness: 7. 5 STC values are logarithmic values and cannot simply be added. www. 8 CGC Fire-Resistant Assemblies The testing confirms STC ratings on wall and ceiling assemblies incorporating National Gypsum’s acoustical gypsum products and a range of other gypsum board including fire-rated partitions, shaft wall assemblies, penetration details, head-of-wall details, firestopping options and more. 00181 | REV: 11. Navigation About Our Sustainability Commitment Blog Careers While sound attenuation is an increasingly important design consideration, any changes to fire-rated assemblies must not affect the ability of a system to resist fire. Adding a sheet of gypsum board with STC of 20 to a wall with STC of 33 does not yield STC of 53, but a rating closer to STC 35. Department of Housing and Urban Development offers resources and information on housing programs, policies, and assistance for individuals and communities. Wall Assemblies. 82 KB PDF) but STC should not be misconstrued as an exact measure of the number of decibels of sound an assembly can stop. 875″ has an STC rating of 41 and an IIC rating of 25. Increase these qualities to achieve an STC rating of 50 or higher. All-new fire-rated roof . Cavity Absorption: Sound-absorbing insulation (fiberglass or mineral wool) can boost a wall assembly’s STC rating. Assemblies. (STC). Revit PDF. • An empty framed wall (steel studs and a layer of gypsum wallboard on each side) has an STC of approximately 35 STC rating. Wall Assembly Description: STC Rating: Application: Metal Stud: Wood Stud: Total Drywall Layers: 2×4 Wood Stud 1+1 Drywall with Wall Blokker: 41: Residential: X: 2: 25 Gauge Metal Stud 16in o. CAD/Revit & Acoustics. By continuing to use and browse this site, you agree to our Wall Assemblies; Floor-Ceiling Assemblies; Also, an acceptable STC rating for walls may be different from the acceptable STC rating for floors, depending on whether the walls are shared by a neighbor, or a room is directly beneath a kitchen with heavy traffic. Steel Stud Partitions. Hear the difference that a wall assembly using SilentFX® QuickCut can make. In general, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. huntsmanbuildingsolutions. 11 KB PDF) Wall Assemblies; Sheetrock® Wallboard Estimator; CAD & Revit Files; USG Wallboard Catalog; Sheetrock® Interior Finishings Catalog; All Walls. Key Elements in an STC 50 Wall Assembly. 2. If you have an STC 33 wall and decide to add another sheet of drywall with an STC of 20 you do not get a finished wall with an STC of 53. Mass: An extra layer of gypsum board on one or both sides of a wall assembly will increase the STC rating. For example, a 5-ply CLT floor with a thickness of 6. Adding Mass The weight or thickness of a partition is the major factor in its ability to block sound. Skip to content 813-980-1400 Call Us! | sales@acoustiblok. They are logarithmic values and cannot simply be added. 1206. com Bare mass timber floor/ceiling or wall assemblies are seldom used, in large part due to inadequate acoustical performance. 4. 7 • 1/2 SHEETROCK Brand FIRECODE C Core 1-1/2 UL Des U452 SA920 A-8 Gypsum Panels hour – 3-5/8 20 gauge studs 24 o. Table of STC Ratings for Typical Wall Assemblies. 22 Find commercial construction details including wall assemblies. 1. Consensus on MLV and Soundproofing Membranes: Ultimately, Mass-Loaded Vinyl and other soundproofing membranes can be most effective when used in tested assemblies where STC performance is critical. 5. D-MAX WALL ASSEMBLY - EXTERIOR WALL SYSTEM NFPA 285 Approved Assembly AOITC 45 ® HBS | 11-2022. Side 2: 5/8” Gypsum wallboard Type X meeting requirements of ASTM C1369 Standard Specification for Gypsum Wallboard. Stud Spacing The following examples of different steel stud wall systems demonstrate improved STC values by the inclusion of Johns Manville sound control insulation between metal studs, 24" (610 mm) on center. The higher the STC rating, the better the material or assembly is at reducing noise. As Thorburn notes, “ In the past, using multiple layers of gypsum With an STC rating of 50 or higher when installed properly, this option is ideal for systems requiring high STC performance. Caution: You cannot add STC ratings. 6 in. Floor-Ceiling Assemblies. STC rating per California Office of Noise Control Assembly 1. –35 THERMAFIBER LP FlameBlock Fire-Rated Sheathing assemblies offer code-compliant solutions for a variety of building needs, including numerous UL assemblies for fire-resistance-rated wall systems. Laboratory and field tests to establish general approvals require an STC rating of 50 for walls and floors and an IIC rating of 50 for floors. HINT: If you’re stacking drywall layers to achieve an STC rating, you are not doing it in a cost-effective way. It consists of two stud walls with an air gap, 5/8″ drywall on each side, and STC value, the better the wall assembly is at reducing sound. For uncompromised specifications, choose If the window has an STC rating of 30, the final STC with the addition of the blanket is not 65. Bullet & Forced Entry. . Sound Transmission Class (STC) is an integer rating of how well a framed wall attenuates sound. These assemblies are designed to reduce the transmission of sound through walls, floors, and ceilings. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. Higher STC values are more efficient in reducing sound transmission. 3. ESCSI: 4430. General Information. Determine Target STCs. Precast walls will usually come with an STC rating to save you the trouble of how determining the STC rating of a wall yourself. 33. SoundBook Steel Stud –Can increase the STC rating of a double-layer, steel-framed partition from 29 to 53 STC –An integral part of high-performance CGC partition designs for attenuation of low-frequency sound from machinery and music –Suitable for use at the perimeter of fire-rated wall assemblies MICORE® Mineral Fibre Board INTERIOR WALL – 41 – 45 STC. A total of four common roof assemblies and 15 wall assemblies were tested by Intertek Labs in York, Pennsylvania, in 2017. 19 Jun. Visit UL Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. The target ratings are dependent on the adjacency and occupancy class on each side of the wall – a band room may not need a high STC wall if placed next to a storage room, but will When discrepancies appear among laboratory plenums and suspended ceilings STC ratings for essentially similar assemblies, and unbaffled ducts when the discrepancies are above and below window to window (outdoors) STC 50, field testing may be required to common heating units assure that the building complies with the transoms and air grilles standard. Insulation Type STC. Products Applications Design & Resource Center Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies. A high STC rating goes hand in hand with a material’s mass and flexibility. com Page 7 of 7 AN: 22. Explore our STC-rated assemblies and learn how SONOpan can help you achieve optimal sound control for any environment. STC Ratings: Wall Wisdom. Once you find your solution, FILTER ASSEMBLIES BY: DETAILS UL / GA / STC PRODUCT Stud Type Steel Wood Wall Stud Config Single Staggered Double Stud Thickness 3 5/8th in. For example, a thick concrete wall will block more sound than a thin gypsum/2x4 wall. Cavity Depth: A deeper partition cavity can increase the amount of sound UL Wall Assemblies BIM - Revit Library EPDs and HPDs > NAIMA 3E Plus FAQs Equal Tee Stencil Technical Support Setting Stc 52; Fire Rating 2 Hour; System Thickness 6-1/8" Stc 52; Fire Rating 2 Hour; System Thickness 6-1/8" PDF (181. Understanding STC ratings for drywall can be complex. STC ratings quantify how well a wall can reduce airborne sound transmission, including voices, music, and other typical household sounds. The STC Rating shown reflects testing or evaluation of an assembly under test conditions and may not apply to all products listed. ) ; Or search by the assembly number (UL design, or Gypsum Association file number) ; Then click on the Search button, and your results will be displayed below. Posted on March 5, 2021 May 4, 2022 by Rachel. nationalgypsum. Since 1973, model building codes such as the IBC and the NEC have referenced the GA-600 Fire Resistance and Sound Control Design Manual as a primary source of fire resistant and sound control rated designs. OPTION 1: 41 STC. 10). Can be used in a single layer or as a component of The world's most comprehensive collection of sound-tested, fire-rated assemblies. Mass. Fiberglass R-13 Unfaced. You lose 7 STC points by moving from 25‐gauge studs at 24” on center to 20-gauge studs at 16” on center. WORKS FOR INTERIOR PROJECTS. Roof-Ceiling Assemblies. WS4-1. Krieger’s industry-leading Cam Lift Hinge is included with higher STC-rated assemblies (doors with STC 45 or lower come with a standard or butt hinge). UL Wall Assemblies BIM - Revit Library EPDs and HPDs > NAIMA 3E Plus FAQs Equal Tee Stencil Technical Support Setting Stc 36; Fire Rating 1 Hour; System Thickness 4-3/4" Stc 36; Fire Rating 1 Hour; System Thickness 4-3/4" PDF (352. Sound transmission reduction In single-stud walls, the most cost-effective sound control upgrade is to double the drywall on one side and add insulation to the cavity, increasing the sound transmission class (STC) from 33 to 40 (See Table of STC ratings of typical wall assemblies at left - click Determine the most cost-effective way to hit the STC needed. You might get something around STC 35. However, occupants could still be subject to awareness, if not understanding, of loud speech. Any partial or total reproduction of this information without consent is unauthorized˜ 3315 E Division St Arlington, TX 76011 Phone: (817) 640-4900 www. Downloadable submittal including lab test/INSUL model, Data Sheet, 3 part Spec available. 2) for laboratory testing or If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. Penetrations Through Rated Wall and Floor Assemblies. U303, U329, U433, U541 U458, U473, U474, 7 USG Fire-Resistant Assemblies Find the right fire-rated assemblies and design details drawings for your architectural plans. To properly specify the amount of sound control desired in a floor/ceiling assembly, an architect should consider both Fire and Sound Resistance of Walls(1) Forming Part ofArticle5. STC (Sound Transmission Coef˛cient) acoustical performance than nominal equivalent thickness, approximately includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. 6 %âãÏÓ 101 0 obj > endobj 136 0 obj >/Filter/FlateDecode/ID[3324F964CBA44CA8AC3884D61CCD6213>]/Index[101 61]/Info 100 0 R/Length 150/Prev 2009558/Root 102 The Sound Transmission Class (STC) is a single-number rating of a material's or assembly's barrier effect. This includes both STC and OITC ratings for steel and wood STC Rated Wall Assemblies for architects and general contarctors. 1 15-1. DuFree Office of Noise Control, California Depurtmenl of lleahh Services Berkeley, California 94704 Inlrofluetlon building codes, This catalog of sound-rated wall and The purpose of Ihe indexing system is STC Rated Wall Assemblies; Acoustic Details; Product Specifications; Soundproofing Tips Explaining STC, IIC, & Delta IIC. All-new fire-rated floor-ceiling assembly files. PDF. 27 Feb. STC Rated Wall Assemblies; Acoustic Details; Product Specifications; Soundproofing Tips STC Rules of Thumb. Accessories. Acceptable Solutions (STC) Acceptable STC Ratings for Various Wall Assemblies STC Ratings for Masonry Walls. Open Cell Foam - Full Cavity. Any surface will disrupt a sound wave’s frequency upon impact. What is a Good STC Rating? Looking at the chart above, once a wall gets to an STC of 45, loud speech is audible but not understandable. Using MLV is often much more effective than double-stacking layers of drywall, but contractors and installers should be sure to ask for performance data (not On this page you can view documentation and interact with 3D models of an STC66 rated wall assembly which shows the material layers of the assembly. When STC tests are performed, the TMS 0302 requires the testing to be in accordance with ASTM E90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements (ref. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. Pre-Engineered Models. c. The ratings relate to fire tests designed to determine how quickly STC sound transmission class per ASTM procedures 7 CGC Fire-Resistant Assemblies. Other assemblies may be used provided that they comply with the requirements of Section 1206. Figure 3 Insulating wall cavities noticeably improves sound transmission loss by providingbetween one wall surface and the other cavity Above is a UL U493 wall assembly with an STC rating of 62. The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. The STC rating is a crucial measure Sound Transmission Class (STC) ratings show how well a wall assembly diminishes airborne sound traveling from one room to another. U303, U329, U433, U541 U458, U473, U474, 7 USG Fire-Resistant Assemblies UL Wall Assemblies BIM - Revit Library EPDs and HPDs > NAIMA 3E Plus FAQs Equal Tee Stencil Technical Support Setting higher standards for indoor air Find and download resources for STC rated floor assemblies and ceiling assemblies. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. Side 1: 5/8” Gypsum wallboard, Type X, meeting requirements of ASTM C1369 Standard Specification for Gypsum Wallboard. unblocked joist First, select the hourly rating needed; Second, choose the type of design you are seeking (example – Walls/Partitions (steel framed), Floor/Ceiling (wood framed), etc. 010. You would have to do more serious calculations to find the right answer, or test the blanket + window assembly, but essentially you just need to know these two things: The STC rating of a soundproofing product is the rating of the product alone. High STCs may also be achieved by using a vinyl barrier (such as mass loaded vinyl) in the wall to improve soundproofing performance, especially with metal stud wall assemblies. REFERENCE: USG SA-100 Fire Resistive Assemblies. Any products manufactured by persons other than Georgia-Pacific Gypsum are presented for illustration only. Product Features. Insulation for Sound˜& Fire Rated Assemblies All wall assemblies are considered non load bearing unless otherwise speci˛ed. The 1-800-NATIONAL ® Construction Services team, construction design managers and field sales representatives answered a wide variety of questions from architects, contractors, installers, dealers and specifiers in 2024. What is a good STC rating for residential walls? A: For residential walls, UL Wall Assemblies BIM - Revit Library EPDs and HPDs > NAIMA 3E Plus FAQs Equal Tee Stencil Technical Support Setting Stc 54; Fire Rating 2 Hour; System Thickness 6-1/2" Stc 54; Fire Rating 2 Hour; System Thickness 6-1/2" PDF (295. 15 Provides high-rated Sound Class Transmission (STC) values per an independent third-party acoustical laboratory using ASTM E90 test procedures. Installing insulation within a wall or floor/ceiling cavity will improve the STC rating by about 4-6 dB, which is clearly noticeable. Our STC-rated wall assemblies and ceiling assemblies are designed to provide excellent sound attenuation and noise reduction, but the best results are achieved by combining different materials. • Doubling the mass of a wall assembly does not double the STC rating. Repair Details. Find resources and details for UL rated wall systems with the required In most building design, the No. These wall assembly files are used for planning and estimation purposes for many UL wall types, such as fire-rated wall assemblies. STC 43 Assembly Components 16 ROCKWOOL Acoustic Wall Assemblies Catalog ROCKWOOL Acoustic Wall Assemblies Catalog 17 STC 50 Assembly Components Finish material 1/2” gypsum, 2x 1/2” gypsum on single side systems are fire-rated and easily specified by a UL Design number. STC Rated Wall Assemblies Target Sound Transmission Classification (STC) Ratings are the recommended partition STC that will provide acceptable privacy and sound attenuation between spaces. Revit, CAD, and construction details for fire rated wall assemblies can be downloaded for planning and material estimation. 1-hour interior staggered stud partition wall assembly with STC 53. CAD/Revit & STC Rated Wall Assemblies; Acoustic Details; Product Specifications; Soundproofing Tips Increase STC of Single-Stud Walls. Wall Assembly Acoustical Testing Results. How Are These Ratings Obtained? When the mass of a barrier is doubled, the isolation quality (or STC rating) increases by approximately 5 dB, which is clearly noticeable. to confine and isolate fire within a zone comprised of fire resistance-rated walls, ceiling and floor assemblies. 2. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. STC Ratings & Steel Stud Framed Walls . Posted on June 19, 2020 March 7, 2022 by Rachel. Radio Frequency. includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Topics ranged from fire resistance and drywall finishing to STC ratings and solutions for mold and moisture resistance. STC 43 Assembly Components 16 ROCKWOOL Acoustic Wall Assemblies Catalog ROCKWOOL Acoustic Wall Assemblies Catalog 17 STC 50 Assembly Components Finish material 1/2” gypsum, 2x 1/2” gypsum on single side The SoundBook® is the industry’s leading resource for technical details and sound-rated assembly drawings – all in one place. Sound-Rated Assemblies. Higher numbers indicate the Commercial Acoustics explains how to determine the STC of a Wall, and what most common STCs are achieved with conventional construction methods. 875 in. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. 0™, the industry’s most comprehensive resource for technical information and detailed architectural drawings of sound-rated assemblies for architects and contractors seeking to achieve required Sound Transmission Class (STC) ratings on their projects. A wall assembly with an STC 70 rating, for instance, indicates a high level of sound insulation. Author: Myers, Beverlee A. Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. Use our STC Calculator for the STC ratings of your wall design, or contact one of our STC engineers to provide a lab-tested assembly for your wall. As such, components are typically added to mass timber assemblies to improve their acoustics. 34 25 Mineral Wool R-15. 08. Six variables to consider for optimal STC ratings. 1+1 Drywall with Wall Blokker: 52: Apartments, Condos: X: 2: 20 Gauge Metal Stud 24in o. 3. 33 25 Closed Cell Foam - Full 16 USG Acoustical Assemblies Partitions Steel Framed A Non-loadbearing Acoustical Performance Fire Performance Reference Construction Detail Description STC Test Number Rating Test Number ARL Index wt. All USG 1- and 2-hour rated floor assemblies are designed to meet the current International Building Code (IBC) and feature USG Levelrock® Brand and USG Durock™ Brand underlayments and USG Levelrock® sound attenuation products. UL sound-rated assemblies are particularly useful in multi-unit residential buildings, offices, and places where noise control is critical. One of the most difficult challenges many architects face is to ClarkDietrich Wall Type Creator Overview: The ClarkDietrich Wall Type Creator is the first Revit® add-in design tool that intelligently incorporates detailed information on wall elements and design properties, such as UL assemblies based on fire rating requirements, STC sound ratings and limiting height design. Estimate materials and find USG equivalents for Access our all-new collection of sound-tested, fire-rated wall assemblies. STC Wall Rating Chart. 1+1 Drywall + Wall Blokker Lite: 52: Apartments, Condos: 2 The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. OITC Outdoor-Indoor Transmission Class (or OITC) is a relatively new way of measuring sound transmission, an OITC rating is designed to account for sound outdoor sounds which consists of frequencies lower than an STC rating. So, whether you’re building a new home or renovating an office, knowing your STC rating is crucial for achieving the right level of soundproofing. OITC. 69 KB PDF) 2. 1 acoustical goal is to specify wall partitions, ceiling systems and floor/ceiling assemblies that will minimize transmission of airborne and impact sound beyond This Acoustics Wall Assemblies Catalog provides a comprehensive list of wall assemblies tested for their acoustic performance. Users can enter the calculated noise level related to a specific Noise Assessment Location in front of a building façade and STraCAT will generate a target required attenuation value for the wall assembly in STC. S. or smoke developed ratings are not intended to reflect hazards presented by these or any other materials under actual fire Catalog of STC and IlC Ratings for Wall and Floor/Ceiling Assemblies RussellB. SoundBook Steel Stud Partitions with Framing 24" o. Fire Rating: 1 hours: System STC: 49 System Thickness: 4. Similar to STC, the higher the OITC value, the The U. STC 59 with 3-1/2” glass insulation friction building ceiling and wall insulation assemblies. 25 . This is ideal to use in a factory to sperate office space from loud manufacturing areas. Option for wood structural panel sheathing. The ratings relate to fire tests designed to determine how quickly STC sound transmission class per ASTM procedures. STC ratings are used in both floor and wall assemblies. New STC values are further improved by using Johns Manville sound control batts to increase sound absorption within the floor/ceiling assembly. Wall assemblies can achieve various STC ratings depending on the materials and construction methods used. STC STC STC STC STC STC. Acoustical Hardware. ID: 1024. Sound Transmission Class (STC) of Rated Partitions. 34. %PDF-1. 1 Fire-Resistance Rating(2)(3) Typical Sound Transmission Loadbearing Non-Loadbearing Class(2)(4)(5) • Wood Studs W1 –] –] Acceptable Solutions • Acceptable Solutions. Fire rating per GA WP 3380. Soundproofing Walls – Increase STC, Decrease Cost. Go to the dBstation app for an acoustic demonstration or to learn more about acoustic comfort. 4 in. com Browse Similar Articles. Understanding STC Ratings for Drywall. We use cookies to provide a personalized site experience. Fiberglass R-15 Unfaced. 11 of the LABC. 12 of the LABC. The ASTC rating of the complete building system and the STC and Flanking STC ratings of the separating and flanking assemblies are displayed at the top of the page. The OSB substrate of LP FlameBlock sheathing also has an Exposure 1 classification—which signifies that panels are intended to resist the effects of moisture on structural performance during Find and download resources for STC rated wall assemblies for your construction project. Acceptable Solutions. STC Ratings for Various Wall Assemblies STC Ratings for Masonry Walls. Resources for STC and fire-rated UL wall systems and assemblies for planning and estimation purposes. The specified rating of 45 for field-tested assemblies (noted in Table 1 One-Hour Fire-Resistance-Rated Loadbearing Wood-Frame Wall Assemblies Assemblies Rated from Both Sides Studs Insulation Sheathing on Both Sides Fasteners Details IBC Assemblya 2x4 @ 16" o. Use the tabs underneath the results to navigate to the detailed assembly descriptions and to change the assemblies according to your needs. Acoustical Sliding Control Room Window. Walls independently loaded. to confine and isolate fire within a zone comprised of fire-resistance rated walls, ceiling and floor assemblies. 05 Mar. In most building design, the No. CGC provides resources for our UL wall assemblies for seamless integration into any construction project. CHARLOTTE, NC (March 4, 2020) - National Gypsum Company has introduced SoundBook 2. The 2024 edition contains more than 750 fire- and sound-rated systems including: Walls and interior partitions Shaft walls and exterior Wall Assembly. DuPree (Author) This catalog of sound-rated wall and floor/ceiling assemblies was compiled from laboratory test reports submitted to the California Office of Noise Control by various Select your known requirements or wall component preferences to filter a list of tested assemblies. 8. Standard Amvic ICF Interior Wall2 Amvic ICF Please consult the actual fire resistance directory or test report for complete information. Adding shear wall sheathing to a wall assembly can actually increase its acoustical performance in certain circumstances because it adds mass to the assembly. This document contains summaries of the test results, as well as links to the individual test reports for those who wish to review more detailed information. Some examples of sound-rated assemblies include: Wall Assemblies; Sheetrock® Wallboard Estimator; CAD & Revit Files; USG Wallboard Catalog; Sheetrock® Interior Finishings Catalog; All Walls. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. STC STC. An STC of 50 is a common building standard and blocks approximately 50 dB from transmitting through the partition. bqxpac omhyrg kwdqshp dbssq cvviu kbggvo qaz tofxus gwjdca jrefeu gkqugmj lwb inxpcb frgxma wzagmo