[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-649556-105":59,"doc-detail-649556-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","basic-deck-code-requirements-for-prescriptive-residential-wood-deck-design","Basic Deck - Code Requirements for Prescriptive Residential Wood Deck Design","","Basic Deck summarizes prescriptive residential wood deck design requirements reflecting the 2018 International Residential Code (IRC) with Washington State amendments. It outlines typical applicability limits, structural loading assumptions, and durability and corrosion-protection rules for wood and fasteners. It also provides engineering notes on acceptable modifications, attachment rules, and interpolation use for sizing tables. Included tables cover joists, beams, post heights, footing dimensions, and deck ledger connections with specific span and spacing limits.",{"@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":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/basic-deck-code-requirements-for-prescriptive-residential-wood-deck-design/649556/",{"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/basic-deck-code-requirements-for-prescriptive-residential-wood-deck-design/649556.png","ImageObject",300,407,{"name":92,"@type":93},"Patrick","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-25","2026-10-24",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"When is a licensed architect or engineer needed for deck design under these code notes?","Question",{"text":112,"@type":113},"A licensed architect or engineer is needed when the deck serves something other than a one- or two-family dwelling building, includes more than one level, supports heavy objects like a hot tub or pavers, has a walking surface more than 14 feet above grade, or has certain attachment/support conditions (e.g., ledger attached to nonstandard substrates or self-supporting decks).","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What design loads and soil-bearing capacity are used for deck design calculations?",{"text":117,"@type":113},"Deck design loading uses 60 psf live load, 10 psf dead load, and a 1500 psf soil-bearing capacity for soil-bearing conditions stated in the document.",{"name":119,"@type":110,"acceptedAnswer":120},"What fastening and wood durability requirements apply to deck construction?",{"text":121,"@type":113},"All wood must be pressure-treated or naturally resistant to decay, and cuts/holes/notches must be treated with end-cut solution. Fasteners and related connectors must be stainless steel, hot-dipped galvanized, or specifically required for the chosen wood preservative, with required zinc-coated fastener weights documented in the field.","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},649556,1792900661,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":46},549758146520,"https://ap-avatar.wpscdn.com/avatar/80002397d8c0411e94?_k=1775819394049821470","Basic Deck  \nThis tip sheet reflects code requirements of the 2018 International Residential Code (IRC) with Washington State Amendments.  \nTypical Deck  \nThis document provides building code information applicable to prescriptive residential wood deck design. You may need to hire a licensed architect or engineer to design a deck where any of the following conditions apply:  \n• The deck serves other than a one-or two-family dwelling building  \n• The deck design includes more than one level  \n• The deck will support a hot tub, spa or other heavy object, including heavy deck covering (such as pavers)  \n• The walking surface is more than 14 feet above grade  \n• The deck ledger is attached to house overhangs, bay windows, bricks, stone, or concrete block  \n• The deck is bearing on ground with a slope greater than 1 foot horizontal for every 1 foot vertical  \n• The deck is self-supporting (not attached to an exterior wall)  \nDeck Construction Notes  \n• Design loading for decks is based on 60 pounds per square feet (PSF) live load, 10 PSF dead load, and 1500 PSF soil-bearing capacity.  \n• The illustrations and information in this tip Sheet may be used for decks whether or not they require a permit. See Tip Sheet 0 for when a permit is required.  \n• All wood must be pressure-treated or naturally resistant to decay. Treat cuts, holes, and notches with end-cut solution.  \n• Fasteners, hangers, nails, etc. , must be stainless steel, hot-dipped galvanized, or as specifically required for the specified wood preservative used. The coating weights for zinc-coated fasteners to be in accordance with ASTM A 153. Provide documentation in the field showing the required fastener protection for the wood chosen for your deck.  \n• You may modify any components of this Tip Sheet using accepted engineering practices. Any modifications must be reviewed prior to permit issuance. All attachments must be per manufacturer’s installation instructions.  \n• Visit [MyBuildingPermit.com](MyBuildingPermit.com) for additional Tip Sheets for stairs, handrails, and notching and boring.  \nWhen using the tables below, interpolation is allowed, extrapolation is not allowed.  \nSizing of Structural Elements  \n\n| Maximum Deck Joist Span a,c |  |  |  |  |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| Joist\u003Cbr>Size | Joist Spacing b\u003Cbr>(inches) |  |  | Joist Back Span |  |  |  |  |  |  |  |\n|  | 12 | 16 | 24 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 |\n|  | Allowable Joist Span |  |  | Maximum Cantilever (feet-inches) Adjacent Joist Span (feet) |  |  |  |  |  |  |  |\n| 2x6 | 7-11 | 7-1 | 5-9 | 1-0 | 1-6 | NP | NP | NP | NP | NP | NP |\n| 2x8 | 10-5 | 9-5 | 7-8 | 1-0 | 1-6 | 2-0 | 2-1 | NP | NP | NP | NP |\n| 2x10 | 13-3 | 11-6 | 9-5 | 1-0 | 1-6 | 2-0 | 2-6 | 2-8 | NP | NP | NP |\n| 2x12 | 15-5 | 13-4 | 10-11 | 1-0 | 1-6 | 2-0 | 2-6 | 3-0 | 3-3 | NP | NP |\n\na. Includes Incising Factor.  \nb. When using composite decking, refer to manufacturer’s installation instructions for maximum spacing of joists.  \nc. Spans based on Doug Fir-Larch, Hem Fir and Spruce-Pine-Fir, No. 2 grade, wet service factor.  \n\n| Minimum Beam Size |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n| Beam\u003Cbr>Size c,d,e | Deck Joist Span (feet) |  |  |  |  |  |  |\n|  | 6 | 8 | 10 | 12 | 14 | 16 | 18 |\n|  | Maximum Beam Span a, b,d (feet-inches) |  |  |  |  |  |  |\n| 4x6 | 5-2 | 4-6 | 4-0 | 3-5 | 3-1 | 2-10 | 2-7 |\n| 4x8 | 6-11 | 6-0 | 5-3 | 4-7 | 4-1 | 3-8 | 3-5 |\n| 4x10 | 8-5 | 7-4 | 6-6 | 5-10 | 5-2 | 4-9 | 4-5 |\n| 4x12 | 9-10 | 8-6 | 7-7 | 6-11 | 6-4 | 5-9 | 5-4 |\n| 6x6 | 6-6 | 5-7 | 5-0 | 4-7 | 4-2 | 3-9 | 3-5 |\n| 6x8 | 8-8 | 7-6 | 6-8 | 6-1 | 5-6 | 5-0 | 4-7 |\n| 6x10 | 10-7 | 9-2 | 8-2 | 7-6 | 6-11 | 6-4 | 5-10 |\n| 6x12 | 12-4 | 10-8 | 9-7 | 8-9 | 8-1 | 7-7 | 7-1 |\n\na. Spans based on Doug Fir-Larch, Hem Fir and Spruce-Pine-Fir, No. 2 grade, wet service factor.  \nb. If 2x built up beams to make 4x or 6x beams, they shall be fastened with ","cbCaihgZ3xkqwxJ0","https://ap.wps.com/l/cbCaihgZ3xkqwxJ0","pdf",3560199,"English","# Typical Deck\n# Deck Construction Notes\n# Sizing of Structural Elements\n## Maximum Deck Joist Span\n## Minimum Beam Size\n## Post Size\n## Footing Size\n# Deck Ledger and Connections","[{\"question\":\"When is a licensed architect or engineer needed for deck design under these code notes?\",\"answer\":\"A licensed architect or engineer is needed when the deck serves something other than a one- or two-family dwelling building, includes more than one level, supports heavy objects like a hot tub or pavers, has a walking surface more than 14 feet above grade, or has certain attachment/support conditions (e.g., ledger attached to nonstandard substrates or self-supporting decks).\"},{\"question\":\"What design loads and soil-bearing capacity are used for deck design calculations?\",\"answer\":\"Deck design loading uses 60 psf live load, 10 psf dead load, and a 1500 psf soil-bearing capacity for soil-bearing conditions stated in the document.\"},{\"question\":\"What fastening and wood durability requirements apply to deck construction?\",\"answer\":\"All wood must be pressure-treated or naturally resistant to decay, and cuts/holes/notches must be treated with end-cut solution. Fasteners and related connectors must be stainless steel, hot-dipped galvanized, or specifically required for the chosen wood preservative, with required zinc-coated fastener weights documented in the field.\"}]","Basic Deck - Code Requirements for Prescriptive Residential Wood Deck Design | PDF",1792801671]