[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-514289-105":59,"doc-detail-514289-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","bidding-on-bad-vims-designs-proposal-and-liability-guidance","Bidding on Bad VIMS Designs - Proposal and Liability Guidance","","Presentation focused on radon/VIMS design for new construction, outlining what constitutes a “GOOD” design versus “BAD” design. It explains common reasons bad designs happen—limited system understanding, lack of PFE testing, and mismatched assumptions about passive performance. The session provides criteria to identify nonconforming designs under CC-1000, highlights client cost and liability impacts, and covers what to include in a proposal to protect against risk.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/bidding-on-bad-vims-designs-proposal-and-liability-guidance/514289/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/bidding-on-bad-vims-designs-proposal-and-liability-guidance/514289.png","ImageObject",300,407,{"name":92,"@type":93},"Guten tag","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04","2026-10-06",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does the presentation say makes a radon/VIMS design “GOOD” or “BAD”?","Question",{"text":112,"@type":113},"A “GOOD” design aligns with CC-1000 requirements and includes provisions for PFE testing, including identifying test point locations. A “BAD” design fails to conform to CC-1000, uses outdated standards, omits required PFE testing information, and includes installation difficulties or incorrect design elements like improper pipe risers and restrictions in venting.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why does the presentation argue passive radon/VIMS designs can be “BAD”?",{"text":117,"@type":113},"It states passive designs assume the system will work without a blower, that performance can vary by season, and that results depend heavily on installation quality. It also notes that without a second smoke test before slab pour and leak sealing, there is no certainty of a significantly airtight seal.",{"name":119,"@type":110,"acceptedAnswer":120},"What impacts can a “BAD” design have on the client?",{"text":121,"@type":113},"The presentation highlights higher upfront cost from over-engineering and higher costs if later testing finds elevated radon levels and the system does not work. It also mentions potential compliance issues for HUD jobs and raises the question of liability.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},514289,1791404656,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":39,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},687212321768,"https://ap-avatar.wpscdn.com/avatar/a0010bdbe886d2fe77?x-image-process=image/resize,m_fixed,w_180,h_180&k=1789897067658708522","Bidding on Bad VIMS Designs  \nMatt Koch  \nIEA 2025 Conference  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium  \nNow part of  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 2  \nBackground / Objectives  \n• This presentation is focused on new construction radon/VIMS design  \n• What makes a radon/VIMS design “GOOD”  \n• What makes a radon/ VIMS design “BAD”  \n• What different costs can be incurred from a “BAD” design  \n• Communication with client about a “BAD” design  \n• What to put in a proposal to protect yourself from liability  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 3  \nWhen is a Passive Design “GOOD”?  \n• It is really designed to be ACTIVE with the hope that it works passively  \n• Meets the requirements of CC-1000  \n• Provisions for pressure field extension (PFE) testing  \n• Identifies PFE test point locations, future monitor, future electric locations  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 4  \nWhy \" BAD\" Designs Happen?  \n• Nobody intends a bad design (at least most of the time)  \n• Lack of understanding of how systems work  \n• We have always done it this way  \n• Designer has never installed a system in the field  \n• Lack of PFE testing to verify a system will work  \n• Over-engineering  \n• Under-engineering  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 5  \nWhy “BAD” Designs Happen?  \n• Not familiar with CC-1000  \n• Anyone who takes the three-day course is a radon professional  \n• The status quo is that the designer can put just about anything they want down on paper and it is considered a “GOOD” design  \n• The industry accepts the concept of “PASSIVE” mitigation which can be a bad concept  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 6  \nWhy Passive Designs are “BAD”?  \n• Passive provides an assumption that the system will work without a fan (blower)  \n• System performance can differ across the seasons  \n• System will only work as well as the quality of installation  \n• If a second smoke test right before the slab pour is not performed and any leaks sealed, you have no certainty of a “significantly airtight seal”  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 7  \nHow to Identify a “BAD” Design  \n• Does not conform to CC-1000  \n• Conforms to outdated/withdrawn standards  \n• Risers in exterior walls  \n• Wrong size/number pipe risers for size of plenum served  \n• Design creates restrictions in venting system reducing effectiveness (both asa Passive or an Active system)  \n• Areas of a building are not included in the plan  \n• Does not specify PFE testing requirements or locations  \n• Does not specify locations for future monitors  \n• Looks pretty on paper, difficult to install in the field  \n• Scale is incorrect on the design drawings  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 8  \nImpact of “BAD” Design on Client  \n• Higher cost up front (over engineered)  \n• Higher cost if testing finds elevated radon levels and system does not work (under engineered)  \n• If it is a HUD job, HUD may not sign off on draw if non-compliant design  \n• Liability?  \nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 9  \nBad Materials Specified  \n• What is the cross-sectional area of different sizes of pipe?  \n• Using vapor mat – What is the cross-sectional area?  \n• End-out fittings – What is the cross-sectional area?  \n\n| Pipe Inner Diameter (ID) | Cross Sectional Area (sq. ft.) | % Reduction in Area with End Out |\n| --- | --- | --- |\n| 2-inch | 3.1 | + 19% |\n| 3-inch | 7.1 | -49% |\n| 4-inch | 12.6 | -71% |\n| Vapor Mat | 7.0 | -48% |\n\nIndoor Environments TM 2025-Radon and Vapor Intrusion Symposium 10","cbCaifCus9qz2d28","https://ap.wps.com/l/cbCaifCus9qz2d28","pdf",5208512,38,"English","# Background / Objectives\n# When is a Passive Design “GOOD”?\n# Why “BAD” Designs Happen?\n# Why Passive Designs are “BAD”?\n# How to Identify a “BAD” Design\n# Impact of “BAD” Design on Client\n# Bad Materials Specified","[{\"question\":\"What does the presentation say makes a radon/VIMS design “GOOD” or “BAD”?\",\"answer\":\"A “GOOD” design aligns with CC-1000 requirements and includes provisions for PFE testing, including identifying test point locations. A “BAD” design fails to conform to CC-1000, uses outdated standards, omits required PFE testing information, and includes installation difficulties or incorrect design elements like improper pipe risers and restrictions in venting.\"},{\"question\":\"Why does the presentation argue passive radon/VIMS designs can be “BAD”?\",\"answer\":\"It states passive designs assume the system will work without a blower, that performance can vary by season, and that results depend heavily on installation quality. It also notes that without a second smoke test before slab pour and leak sealing, there is no certainty of a significantly airtight seal.\"},{\"question\":\"What impacts can a “BAD” design have on the client?\",\"answer\":\"The presentation highlights higher upfront cost from over-engineering and higher costs if later testing finds elevated radon levels and the system does not work. It also mentions potential compliance issues for HUD jobs and raises the question of liability.\"}]","Bidding on Bad VIMS Designs - Proposal and Liability Guidance | PDF",1791298262,96]