[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-268520-105":3,"detail-sidebar-cat-0-en-105":80,"doc-detail-268520-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":73,"head_meta":75,"extra_data":77,"updated_unix":79},105,"en","guide-to-assessing-clt-surface-quality","Guide to assessing CLT surface quality","","Guide to assessing CLT surface quality explains how to evaluate the visible surface characteristics of cross laminated timber (CLT) elements for different stakeholders across a project lifecycle. It addresses expectations for exposed CLT surfaces by describing industry surface quality grades, relevant standards, and how visual and detail inspections should be carried out at specified viewing distances. The guidance supports developers, contractors, architects and inspectors in assessing knots, checks and other surface features, reducing later queries, misunderstandings and costly complaints.",{"@graph":14,"@context":72},[15,34,55],{"@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/guide-to-assessing-clt-surface-quality/268520/",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/guide-to-assessing-clt-surface-quality/268520.png","ImageObject",300,407,{"name":42,"@type":43},"Gloria","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-09-19","2026-09-15",true,{"@type":52,"interactionType":53,"userInteractionCount":26},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What is the purpose of this guide for CLT projects?","Question",{"text":62,"@type":63},"The guide supports project participants at the start and end of a CLT project by defining how surface quality should be assessed and what clients can realistically expect for visible CLT surfaces.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How should inspectors conduct an overall surface quality assessment?",{"text":67,"@type":63},"Perform a visual inspection at a viewing distance of 2–5 metres. If a closer assessment is needed, use a minimum viewing distance of 1 metre.",{"name":69,"@type":60,"acceptedAnswer":70},"Which CLT surface quality grades does the guide describe?",{"text":71,"@type":63},"It describes Visual Quality (highest), Industrial Visual Quality (next-highest), and Non-Visual Quality (lowest), each with different allowances for features such as knots and other surface characteristics.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},268520,1789431968,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,105,110,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":88,"show_sort_weight":89,"slug":90},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":92,"show_sort_weight":93,"slug":94},"Exam",70,"exam",{"id":96,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},5,"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},6,"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":112,"slug":113},8,30,"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":96,"slug":129},19,"General","general",{"code":4,"msg":81,"data":131},{"doc_id":78,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":111,"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":26,"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":79,"read_time":98},2336474459895,"https://ap-avatar.wpscdn.com/avatar/22000baeef7a5ed0655?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786071322749376916","EDITION 1: 2022  \nGuide to assessing CLT surface quality  \nHoliday home, Skellefteå .  \nCover: Interior featuring CLT and glulam.  \nForeword  \nForeword  \nOver the past decade, cross laminated timber (CLT) has become a popular choice in construction. More and more projects are specifying CLT, as an attractive, sustainable, high quality and competitive construction material. CLT is now used for the structural frame in all kinds of buildings, including apartment blocks, schools, administrative buildings, commercial buildings, halls and car parks.  \nThis growing use of CLT is also increasingly prompting questions about what surface quality the client can expect, not least in buildings designed to have visible CLT surfaces. The end user might contact the CLT manufacturer once the building has been in use for a while, to ask questions about changes in appearance that they have noticed. Even inspectors sometimes wonder how they should be assessing CLT surfaces during the final inspection.  \nThis Guide to assessing CLT surface quality is intended to provide support for developers, project managers, architects, purchasers and others at the start of a project and for inspectors and contractors at the end.  \nSurface qualities other than these industry standards may be offered by CLT manufacturers, but they must be given different designations than those presented in this publication.  \nInspectors should be able to use this guide to assess knots, checks and other features that affect the surface quality of a CLT element. The guide also aims to provide assurance to clients about the basic surface qualities available when choosing exposed CLT surfaces in a building. This helps to ensure realistic expectations and an acceptance that some checks or other visual changes may occur due to the nature of wood as a living material. For developers and contractors, the guide contains information that can be used to support tenders and quotations.  \nFurthermore, the publication lays the foundation for reducing additional work after the CLT project – from clients asking a long list of questions about knots, checks and other features – and for less in the way of costly complaints.  \nThe publication has been produced jointly by industry body Swedish Wood and Sweden’s CLT manufacturers.  \nFurther technical information and guidance on wood, CLT and timber construction is available in TräGuiden, [www.traguiden.se](www.traguiden.se), which is constantly updated with new knowledge and practical advice. TräGuiden is an extensive resource with tables, drawings and illustrations and available in English using Google Translate.  \nInformation on wood, glulam, CLT and timber construction can also be found at [www.swedishwood.com](www.swedishwood.com).  \nStockholm, December 2022  \nJan Brundin, Gert Eriksson and Patrice Godonou  \nGuide to assessing CLT surface quality 3  \nCLT panel  \nGuide to assessing CLT surface quality  \nContents  \nDescription of the different surface qualities 6 Surface quality requirements for CLT on delivery 10  \nSpecific features – description and measurement rules 12  \nKnots 12  \nOther features 14  \nExpected changes in CLT  \n12–24 months after delivery 17 References 20  \nDisclaimer 21  \nCLT manufacturing mills in Sweden 23  \nGuide to assessing CLT surface quality 5  \nDescription of the different surface quality grades  \nDescription of the different surface quality grades  \nThe following CLT images are examples of what the different surface qualities might look like. The images do not represent the limits of each quality –they show that there is a variation within the different surface qualities.  \nInstructions for assessing/inspecting surface quality The purpose of these instructions on how to assess surface quality is to ensure that assessments are conducted the same way every time.  \n1. When performing an overall assessment of surface quality, a visual inspection should be conducted at a viewing distance of 2−5 metres.  \n2. If a closer asse","cbCaijK9rz4Lh1Gk","https://ap.wps.com/l/cbCaijK9rz4Lh1Gk","pdf",2369707,24,"English","# Description of the different surface qualities\n## Surface quality requirements for CLT on delivery\n## Specific features – description and measurement rules\n## Expected changes in CLT\n## References\n## Disclaimer\n## CLT manufacturing mills in Sweden","[{\"question\":\"What is the purpose of this guide for CLT projects?\",\"answer\":\"The guide supports project participants at the start and end of a CLT project by defining how surface quality should be assessed and what clients can realistically expect for visible CLT surfaces.\"},{\"question\":\"How should inspectors conduct an overall surface quality assessment?\",\"answer\":\"Perform a visual inspection at a viewing distance of 2–5 metres. If a closer assessment is needed, use a minimum viewing distance of 1 metre.\"},{\"question\":\"Which CLT surface quality grades does the guide describe?\",\"answer\":\"It describes Visual Quality (highest), Industrial Visual Quality (next-highest), and Non-Visual Quality (lowest), each with different allowances for features such as knots and other surface characteristics.\"}]","Guide to assessing CLT surface quality | PDF"]