[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-565100-105":3,"detail-sidebar-cat-1-en-105":81,"doc-detail-565100-en":126},{"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","decks-deck-joist-spans-and-beam-spans","Decks - Deck joist spans and beam spans","","Prescriptive guidance for conventional wood deck construction outlines deck support requirements, including maximum joist and beam spans, appropriate joist spacing by decking material type, minimum post sizes, beam-to-post connections, and minimum bearing lengths. Deck posts must sit on footings and be restrained at the bottom to prevent lateral movement. Tables 6-4 and 6-5 provide span values for deck joists and beams under outdoor, potentially wet conditions, with notes on lumber grade and wet service factor, plus typical support details and fastening concepts referenced in ICC materials.",{"@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/template/","Template",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/template/presentations/","Presentations",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/template/decks-deck-joist-spans-and-beam-spans/565100/",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/decks-deck-joist-spans-and-beam-spans/565100.png","ImageObject",442,249,{"name":42,"@type":43},"Angel","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-25","2026-10-12",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",5,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What deck support provisions are emphasized in the guidance?","Question",{"text":63,"@type":64},"The guidance specifies maximum joist and beam spans, required joist spacing for the decking material, minimum post sizes, connection requirements between beams and posts, and minimum bearing lengths. It also requires deck posts to be supported on footings and restrained at the bottom to prevent lateral movement.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How do the deck joist span tables account for outdoor conditions?",{"text":68,"@type":64},"The joist and beam span values assume outdoor, potentially wet conditions. The tables also reference wood species commonly used in deck construction.",{"name":70,"@type":61,"acceptedAnswer":71},"What do the bearing length notes in the excerpt specify?",{"text":72,"@type":64},"Minimum bearing lengths are aligned with interior floor joists and beams: 1½ inches on wood or metal, and 3 inches on concrete or masonry.","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},565100,1792360131,{"code":4,"msg":82,"data":83},"success",[84,88,93,98,103,108,113,118,122],{"id":85,"doc_module":22,"doc_module_name":25,"category_name":29,"show_sort_weight":86,"slug":87},11,90,"presentations",{"id":89,"doc_module":22,"doc_module_name":25,"category_name":90,"show_sort_weight":91,"slug":92},12,"Resumes",80,"resumes",{"id":94,"doc_module":22,"doc_module_name":25,"category_name":95,"show_sort_weight":96,"slug":97},14,"Invoices",70,"invoices",{"id":99,"doc_module":22,"doc_module_name":25,"category_name":100,"show_sort_weight":101,"slug":102},15,"Posters",60,"posters",{"id":104,"doc_module":22,"doc_module_name":25,"category_name":105,"show_sort_weight":106,"slug":107},16,"Social Media",50,"social-media",{"id":109,"doc_module":22,"doc_module_name":25,"category_name":110,"show_sort_weight":111,"slug":112},17,"Forms",40,"forms",{"id":114,"doc_module":22,"doc_module_name":25,"category_name":115,"show_sort_weight":116,"slug":117},18,"Letters",30,"letters",{"id":119,"doc_module":22,"doc_module_name":25,"category_name":120,"show_sort_weight":55,"slug":121},21,"Paper Templates","papers-templates",{"id":123,"doc_module":22,"doc_module_name":25,"category_name":124,"show_sort_weight":4,"slug":125},158,"General","general-158",{"code":4,"msg":82,"data":127},{"doc_id":79,"user_id":128,"nickname":42,"user_avatar":129,"doc_module":22,"category_id":85,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":26,"language":135,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":136,"faqs":137,"seo_title":138,"seo_description":12,"update_tm":139,"read_time":22},687207412472,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","DECKS  \nThe IRC provides prescriptive methods for conventional wood deck construction that reflect widely accepted construction techniques in use over many decades. The provisions do not intend to limit design flexibility, and other approved methods may be used. Deck support provisions describe maximum joist and beam spans, appropriate joist spacing for the type of decking material, minimum post sizes, connections between beams and posts, and minimum bearing lengths. Details also are provided for attachment of the deck to the structure. Deck posts must be supported on footings and restrained at the bottom to prevent lateral movement. [Ref. R507]  \nDeck joists and beams  \nThe joist and beam span values in Tables 6-4 and 6-5 assume outdoor, potentially wet conditions and include wood species such as redwood, western cedars, ponderosa pine and red pine that are commonly used in deck construction. Minimum bearing lengths match those for interior floor joists and beams: 1½ inches on wood or metal and 3 inches on concrete or masonry.  \nJoists framing into the side of a ledger board or beam require joist hangers (Figure 6-18) . [Ref. R507.5 through R507.7, Table R507.5, Table R507.6]  \nTABLE 6-4 Deck joist spans (in feet – inches)  \n\n| Species | Size | Spacing of deck joists with no cantilever (in.) |  | Spacing of deck joists with cantilevers (in.) |  |\n| --- | --- | --- | --- | --- | --- |\n|  |  | 16 | 24 | 16 | 24 |\n| Southern pine | 2 x 8 | 11-10 | 9-8 | 10-1 | 9-8 |\n|  | 2 x 10 | 14-0 | 11-5 | 14-0 | 11-5 |\n|  | 2 x 12 | 16-6 | 13-6 | 16-6 | 13-6 |\n| Douglas fir-larch, hem-fir, spruce-pine-fir | 2 x 8 | 11–1 | 9-1 | 9-5 | 9-1 |\n|  | 2 x 10 | 13–7 | 11-1 | 13-7 | 11-1 |\n|  | 2 x 12 | 15–9 | 12-10 | 15-9 | 12-10 |\n| Redwood, western cedars, ponderosa pine, red pine | 2 x 8 | 10–7 | 8-8 | 8-6 | 8-6 |\n|  | 2 x 10 | 13–0 | 10-7 | 12-3 | 10-7 |\n|  | 2 x 12 | 15-1 | 12-4 | 15-1 | 12-4 |\n| [Ref. excerpt of Table R507.5] |  |  |  |  |  |\n\nNote: Spans based on No. 2 grade lumber with wet service factor.  \ncontinued  \nFIGURE 6-18 Typical deck joist span and supports  \nTABLE 6-5 Deck beam spans (feet-inches)  \nDeck joist span (ft.)  \nSpecies  \nSouthern pine  \nDouglas fir-larch, hem-fir, spruce-pine-fir, redwood, western cedars, ponderosa pine, red pine  \n[Ref. excerpt of Table R507.6]  \nSize  \n2 – 2 x 8  \n2 – 2 x 10  \n2 – 2 x 12  \n3 – 2 x 8  \n3 – 2 x 10  \n3 – 2 x 12  \n2 – 2 x 8  \n2 – 2 x 10  \n2 – 2 x 12  \n3 – 2 x 8  \n3 – 2 x 10  \n3 – 2 x 12  \n8  \n7-7  \n9-0  \n10-7  \n9-6  \n11-3  \n13-3  \n5-11  \n7-3  \n8-5  \n8-6  \n10-5  \n12-1  \n10  \n6-9  \n8-0  \n9-5  \n8-6  \n10-0 11-10 5-4  \n6-6  \n7-6  \n7-7  \n9-4  \n10-9  \n12  \n6-2  \n7-4  \n8-7  \n7-9  \n9-2  \n10-9  \n4-10  \n5-11  \n6-10  \n6-11  \n8-6  \n9-10  \n14  \n5-9  \n6-9  \n8-0  \n7-2  \n8-6  \n10-0  \n4-6  \n5-6  \n6-4  \n6-5  \n7-10  \n9-1  \n16  \n5-4  \n6-4  \n7-6  \n6-8  \n7-11  \n9-4  \n4-1  \n5-1  \n5-11  \n6-0  \n7-4  \n8-6  \nNote: Spans based on No. 2 grade lumber with wet service factor  \nThis excerpt is taken from ICC’s Residential Code Essentials: Based on the 2015 International Residential Code ® .  \nThe I-Code Essentials series uses a straightforward, focused approach to explore code requirements with non-code language, allowing readers to gain confidence in their understanding of the material. Each book is an invaluable companion guide to the 2015 IBC, IRC, IFC or IECC for both new and experienced code users.","cbCaik9v5LQf18A9","https://ap.wps.com/l/cbCaik9v5LQf18A9","pdf",227306,"English","# Deck support provisions\n## Deck joists and beams\n## Table 6-4 Deck joist spans\n## Figure 6-18 Typical deck joist span and supports\n## Table 6-5 Deck beam spans","[{\"question\":\"What deck support provisions are emphasized in the guidance?\",\"answer\":\"The guidance specifies maximum joist and beam spans, required joist spacing for the decking material, minimum post sizes, connection requirements between beams and posts, and minimum bearing lengths. It also requires deck posts to be supported on footings and restrained at the bottom to prevent lateral movement.\"},{\"question\":\"How do the deck joist span tables account for outdoor conditions?\",\"answer\":\"The joist and beam span values assume outdoor, potentially wet conditions. The tables also reference wood species commonly used in deck construction.\"},{\"question\":\"What do the bearing length notes in the excerpt specify?\",\"answer\":\"Minimum bearing lengths are aligned with interior floor joists and beams: 1½ inches on wood or metal, and 3 inches on concrete or masonry.\"}]","Decks - Deck joist spans and beam spans | PDF",1791846635]