[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-268547-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-268547-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","acoustic-testing-of-clt-composite-floor-assemblies-for-tmbr-minneapolis-case-study","Acoustic Testing of CLT Composite Floor Assemblies for TMBR - Minneapolis Case Study","","Acoustic Testing of CLT composite floor assemblies examines how to achieve reliable sound isolation in mass timber multi-family buildings, focusing on stacked living spaces. The report outlines core acoustical concepts including airborne isolation, direct impact reduction, and key metrics such as STC and IIC, plus detailing considerations like flanking and structure-borne sound. A Minneapolis-based case study targets composite CLT/concrete configurations and describes floor test assemblies, strategies, observations, and conclusions.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/acoustic-testing-of-clt-composite-floor-assemblies-for-tmbr-minneapolis-case-study/268547/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/acoustic-testing-of-clt-composite-floor-assemblies-for-tmbr-minneapolis-case-study/268547.png","ImageObject",300,407,{"name":42,"@type":43},"Chumphorn","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-05","2026-09-15",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",8,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What acoustical performance measures does the report use for assemblies?","Question",{"text":63,"@type":64},"The report uses STC for airborne sound transmission reduction and IIC for impact noise isolation. It also discusses flanking and structure-borne sound as critical detailing factors.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What is the central acoustical challenge addressed for mass timber multi-family buildings?",{"text":68,"@type":64},"The focus is isolating stacked living spaces within a multi-family timber structure, where both airborne sound and direct impact noise must be controlled effectively.",{"name":70,"@type":61,"acceptedAnswer":71},"What does the Minneapolis case study cover?",{"text":72,"@type":64},"The case study sets acoustic targets for composite CLT/concrete assemblies for TMBR Minneapolis, then presents tools, solutions, and adaptation of acoustic strategies aligned with Type IV-B code requirements.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},268547,1789432192,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,111,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":108,"show_sort_weight":109,"slug":110},7,"Healthcare",40,"healthcare",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":112,"slug":113},30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":55,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":139,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":80,"read_time":144,"preview_page_count":4},2336475401981,"https://ap-avatar.wpscdn.com/avatar/22000c94efd8d5204d?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786935347598174694","Acoustic Testing of CLT Composite Floor Assemblies for TMBR © Minneapolis  \n1621 Hennepin Ave. Suite 100 Minneapolis, MN 55403  \nin collaboration with  \nTable of Contents  \n1.0 Introduction  \nThe Acoustics of Wood  \nIsolation and Insulation  \nElements of a Strategy  \nDesigning an Assembly  \n2.0 Case Study for Composite CLT/Concrete: TMBR Minneapolis Setting Targets  \nTools and Solutions  \nAdapting Acoustic Strategies from Type IV-B Code Requirements  \n3.0 Floor Test Assemblies  \nSubfloor Toppings  \nUnderlayments  \nConclusions and Observations  \n4.0 Conclusions and Observations  \nTable 1: Assembly Group Analysis  \n5.0 Acknowledgements  \n6.0 Assembly Data Sheets  \n1.0 Introduction  \nMass timber buildings (Glulam/CLT/DLT) have received notable media attention recently because they sequester carbon emissions using a rapidly renewable resource, yielding buildings that can be erected as fast or faster than those made of concrete or steel. The industry is growing in response to the demand for sustainable building materials.  \nCurrent impediments to greater growth of mass timber include: the potential economic effects of a limited number of clustered product suppliers (10 currently in the North America) , unfamiliarity in the engineering and architecture communities, and limitations placed on the size and height of structures by the International Building Code.1  \nFigure 1: Mass timber manufacturers in North America (2019)  \nOn the plus side, new mass timber suppliers such as Vaagen Timbers and DR Johnson are coming online alongside national branding campaigns for mass timber structures such as T3 and now TMBR© , which is a signal that capital investment is increasing in mass timber products and engineering. Even the codes are changing: the 2021 International Building Code now contains new sections specific to mass timber that allow larger and taller mass timber buildings. For the trend to continue, however, the mass timber movement needs to scale up and become viable for a variety of building types to expand its market.  \nIn recent days, media attention is focused on projects pushing the boundaries of height and area for mass timber—office towers and high-rise residential. This paper explores what the inspiring images do not convey—the challenge of acoustically isolating stacked living spaces in a multi-family timber structure. Solving a number of acoustical challenges extends the reach of mass timber into new building programs.  \n1 For architects and engineers working on mass timber projects, WoodWorks is a free design assistance and education resource. [See woodworks.org](See woodworks.org).  \nThe Acoustics of Wood (simplified)  \nSound is a disturbance that moves through a medium in waves. Different mediums conduct sound with different speeds and efficiencies according to their makeup. Air , for example, is a prevalent medium for sound. A sound wave in air is propagated by air molecules that are displaced a small amount by the positive and negative pressure fluctuations of the sound wave. This is like spectators in a sports stadium who are displaced when they perform “the wave” with all of the other fans. Note that no single spectator is carried by the wave—each person stands at the peak of the wave for only for a moment as the wave passes. Air molecules behave in an analogous way. Since air is a gas, the molecules float freely and are separated from each other far more than molecules in a solid form. This makes air a relatively poor conductor for sound when compared to water, or wood. To return to the stadium analogy for a moment: air has fewer spectators to conduct the wave.  \nFigure 2 : Music box  \nThe poor conductivity of air is easily demonstrated by cranking a music box toy on different surfaces and comparing the sound levels.2 The sound levels are noticeably higher when the music box rests on a table top than when it is held in hand. Wood is an excellent sound conductor for the following reason: wood is light and elastic. No","cbCaigEN0TLM0LX0","https://ap.wps.com/l/cbCaigEN0TLM0LX0","pdf",5267578,33,"English","# 1.0 Introduction\n## The Acoustics of Wood\n## Isolation and Insulation\n## Elements of a Strategy\n## Designing an Assembly\n# 2.0 Case Study for Composite CLT/Concrete: TMBR Minneapolis Setting Targets\n## Tools and Solutions\n## Adapting Acoustic Strategies from Type IV-B Code Requirements\n# 3.0 Floor Test Assemblies\n## Subfloor Toppings\n## Underlayments\n## Conclusions and Observations\n# 4.0 Conclusions and Observations\n## Table 1: Assembly Group Analysis\n# 5.0 Acknowledgements\n# 6.0 Assembly Data Sheets","[{\"question\":\"What acoustical performance measures does the report use for assemblies?\",\"answer\":\"The report uses STC for airborne sound transmission reduction and IIC for impact noise isolation. It also discusses flanking and structure-borne sound as critical detailing factors.\"},{\"question\":\"What is the central acoustical challenge addressed for mass timber multi-family buildings?\",\"answer\":\"The focus is isolating stacked living spaces within a multi-family timber structure, where both airborne sound and direct impact noise must be controlled effectively.\"},{\"question\":\"What does the Minneapolis case study cover?\",\"answer\":\"The case study sets acoustic targets for composite CLT/concrete assemblies for TMBR Minneapolis, then presents tools, solutions, and adaptation of acoustic strategies aligned with Type IV-B code requirements.\"}]","Acoustic Testing of CLT Composite Floor Assemblies for TMBR - Minneapolis Case Study | PDF",83]