{"id":9827,"date":"2026-09-23T09:00:00","date_gmt":"2026-09-23T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=9827"},"modified":"2026-10-27T05:27:42","modified_gmt":"2026-10-27T05:27:42","slug":"what-is-a-header-in-construction","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/what-is-a-header-in-construction\/","title":{"rendered":"What Is a Header in Construction? 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!important;line-height:1.02 !important;letter-spacing:-.045em !important}@media (min-width:1024px){.rv2 .sw-c h1,.rv2 .sw-t h1{font-size:52px !important;letter-spacing:-.05em !important}}@media (max-width:767px){.rv2 .sw-c section:first-of-type a[style*=\"border-radius:999px\"]:not([href*=\"preferences\/source\"]),.rv2 .sw-t section:first-of-type a[style*=\"border-radius:999px\"]:not([href*=\"preferences\/source\"]){display:flex !important;width:100% !important;justify-content:center !important;box-sizing:border-box !important;min-height:52px}}<\/style>\n<article class=\"pm\">\n<header class=\"pm__hero\">\n<div class=\"pm__inner\">\n<nav class=\"pm__crumb\">Blog &nbsp;&rsaquo;&nbsp; How to Estimate<\/nav>\n<p><span class=\"pm__eyebrow\">Trade Term &middot; Framing<\/span><\/p>\n<h1>What Is a Header in Construction? Spans and Sizing<\/h1>\n<p class=\"pm__dek\">A header is the beam over an opening. The size comes off one table, and that table splits by what the wall carries.<\/p>\n<p class=\"pm__dek-cta\">Pricing the opening? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Estimate it from a photo<\/a>.<\/p>\n<div class=\"pm__rating\"><span class=\"pm__stars\">&#9733;&#9733;&#9733;&#9733;&#9733;<\/span> <b>4.8<\/b> <span class=\"pm__rating-sub\">on the App Store for SimplyWise Cost Estimator<\/span><\/div>\n<div class=\"pm__meta\">\n<span>SimplyWise<\/span><br \/>\n<i><\/i><br \/>\n<span>Updated September 23, 2026<\/span><br \/>\n<i><\/i><br \/>\n<span>5 min read<\/span>\n<\/div>\n<p class=\"pm__prefsrc\" style=\"margin:16px 0 0;\"><a href=\"https:\/\/www.google.com\/preferences\/source?q=simplywise.com\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-flex;align-items:center;gap:8px;min-height:36px;max-width:100%;box-sizing:border-box;padding:6px 14px;background:#fff;border:1px solid #dbe6ff;border-radius:999px;color:#2563eb;font:600 13.5px\/1.3 Inter,-apple-system,sans-serif;text-decoration:none;white-space:nowrap;\"><svg width=\"18\" height=\"18\" viewBox=\"0 0 48 48\" aria-hidden=\"true\" focusable=\"false\" style=\"flex:none\"><path fill=\"#EA4335\" d=\"M24 9.5c3.54 0 6.71 1.22 9.21 3.6l6.85-6.85C35.9 2.38 30.47 0 24 0 14.62 0 6.51 5.38 2.56 13.22l7.98 6.19C12.43 13.72 17.74 9.5 24 9.5z\"\/><path fill=\"#4285F4\" d=\"M46.98 24.55c0-1.57-.15-3.09-.38-4.55H24v9.02h12.94c-.58 2.96-2.26 5.48-4.78 7.18l7.73 6c4.51-4.18 7.09-10.36 7.09-17.65z\"\/><path fill=\"#FBBC05\" d=\"M10.53 28.59c-.48-1.45-.76-2.99-.76-4.59s.27-3.14.76-4.59l-7.98-6.19C.92 16.46 0 20.12 0 24c0 3.88.92 7.54 2.56 10.78l7.97-6.19z\"\/><path fill=\"#34A853\" d=\"M24 48c6.48 0 11.93-2.13 15.89-5.81l-7.73-6c-2.15 1.45-4.92 2.3-8.16 2.3-6.26 0-11.57-4.22-13.47-9.91l-7.98 6.19C6.51 42.62 14.62 48 24 48z\"\/><\/svg>Add SimplyWise as a preferred source<\/a><\/p>\n<figure class=\"pm__fig\">\n<img decoding=\"async\" alt=\"Interior stud wall framing exposed during a renovation, with vertical 2x4 studs, horizontal blocking, blue electrical boxes and yellow cable, and framed openings in the wall\" loading=\"eager\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/d\/d4\/Framing_of_walls._home_renovation.jpg\/1280px-Framing_of_walls._home_renovation.jpg\"\/><figcaption style=\"font:500 13px Inter;color:#9ca3af;margin-top:10px;text-align:center;\">Stud wall framing during a renovation. Photo Kurtkaiser, Wikimedia Commons, CC0.<\/figcaption><\/figure>\n<\/div>\n<\/header>\n<div class=\"pm__body\">\n<div class=\"pm__inner\">\n<aside class=\"pm__tldr\">\n<div class=\"pm__tldr-label\">At a glance<\/div>\n<ol>\n<li>A header is the beam over an opening. It takes the load the cut studs carried.<\/li>\n<li>Spans come off IRC Table R602.7(1), tied to a load case, a width and a snow load.<\/li>\n<li>At 30 psf snow and 24 ft of width, a doubled 2&#215;10 spans 6 ft 10 in under roof and ceiling. Put a floor on it and that drops to 5 ft 8 in.<\/li>\n<li>Nonbearing walls need no load bearing header, per R602.7.4.<\/li>\n<\/ol>\n<div class=\"pm__tldr-cta\"><span>Price the opening, the header and the trim in one estimate.<\/span><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a><\/div>\n<\/aside>\n<h2>What is a header in construction?<\/h2>\n<p>A header in construction is the horizontal member across the top of a door, window or other opening in a wall. It carries the load the cut studs no longer carry. It then transfers that load through short jack studs into the plate below.<\/p>\n<h2>Why a header exists<\/h2>\n<p>Studs in a bearing wall are a line of little columns. Cut a 6 ft hole and four or five are gone, but the load does not go with them. The header bridges the gap and hands it to the jack studs each end. That load path is the answer to what is a header in construction.<\/p>\n<p class=\"pm__inline-cta\">Quoting the opening too? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Estimate it from a photo<\/a>.<\/p>\n<h2>The code section: IRC R602.7 and its span tables<\/h2>\n<h3>First question: is the wall carrying anything<\/h3>\n<p>Section R602.7.4 is blunt. Load bearing headers are not required in interior or exterior nonbearing walls. The expensive error runs the other way, when a wall that reads as a partition carries a bearing point.<\/p>\n<h3>Three tables, three load paths<\/h3>\n<p>Table R602.7(1) covers exterior bearing walls, R602.7(2) interior bearing walls, R602.7(3) open porches.<\/p>\n<h3>Every span carries a load case, a width and a snow load<\/h3>\n<p>Table R602.7(1) is a grid. Down the left it splits by what the header holds up. The blocks run roof and ceiling only, then roof, ceiling and one center bearing floor, then a clear span floor, then two floors. Across the top it splits by building width, at 12, 24 and 36 ft. Width is measured perpendicular to the ridge. Then it splits again by ground snow load. A span quoted without all three is not a code figure.<\/p>\n<div class=\"pm__callout\">\n<p>Doubled 2&#215;10, No. 2 grade of Douglas fir-larch, hem-fir, southern pine or spruce-pine-fir, 30 psf ground snow. Roof and ceiling only: 9 ft 0 in at 12 ft of width, 6 ft 10 in at 24 ft, 5 ft 9 in at 36 ft. Add a center bearing floor. The same beam now reads 7 ft 3 in, 5 ft 8 in and 4 ft 10 in. One block too high costs 11 to 21 in of span.<\/p>\n<\/div>\n<p>One more footnote bites: those spans assume the top of the header is braced by perpendicular framing. Where cripple studs bear on it instead, multiply a 2&#215;8, 2&#215;10 or 2&#215;12 span by 0.70.<\/p>\n<h3>Engineered lumber does not use these tables<\/h3>\n<p>LVL, glulam and PSL are sized off the manufacturer&#8217;s own tables. Those tables are brand specific. Weyerhaeuser&#8217;s current Trus Joist guide TJ-9000, the July 2026 edition, sizes its 2.0E Microllam LVL from load tables in pounds per linear foot, not from house width.<\/p>\n<h2>A worked example, with the arithmetic<\/h2>\n<p>One story house, 24 ft wide, 30 psf ground snow, No. 2 lumber, a 6 ft rough opening in a wall carrying roof and ceiling only.<\/p>\n<ol class=\"pm__steps\">\n<li>\n<h3>Convert to inches<\/h3>\n<p>6 ft 0 in is 72 in. Convert every table value the same way.<\/p>\n<\/li>\n<li>\n<h3>Read the roof and ceiling block at 24 ft<\/h3>\n<p>A doubled 2&#215;8 caps at 5 ft 9 in, or 69 in. Three inches short, so it is out.<\/p>\n<\/li>\n<li>\n<h3>Step up one size<\/h3>\n<p>A doubled 2&#215;10 reaches 6 ft 10 in, or 82 in. That is 10 in of margin, so it governs.<\/p>\n<\/li>\n<li>\n<h3>Read the jack studs off that row<\/h3>\n<p>The NJ column calls for two each end.<\/p>\n<\/li>\n<\/ol>\n<p>Move that opening to a first floor where a center bearing floor lands on the wall. The doubled 2&#215;10 row drops to 5 ft 8 in, or 68 in, so it no longer makes the opening. A doubled 2&#215;12 at 6 ft 8 in does.<\/p>\n<p class=\"pm__inline-cta\">Line item the header, the jacks and the patch. <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Price it from a photo<\/a>.<\/p>\n<h2>Where a header shows up on a job<\/h2>\n<h3>Who calls out what is a header in construction, and when<\/h3>\n<p>On a plan set it comes off a schedule. On a remodel the framer sizes it off the table, and the department checks that choice at rough framing.<\/p>\n<h3>What the inspector looks at<\/h3>\n<p>Size and ply count, jack studs each end, king studs beside them. Then whether the header matches the load case. A doubled 2&#215;8 over a 6 ft opening under roof, ceiling and one floor on a 24 ft wide house fails on sight.<\/p>\n<h2>Common header mistakes<\/h2>\n<h3>Quoting a span with no load case<\/h3>\n<p>A doubled 2&#215;10 spans 9 ft 0 in only under roof and ceiling. That is at 12 ft of width, at 30 psf ground snow.<\/p>\n<h3>Trusting a rule of thumb<\/h3>\n<p>One inch of depth per foot of opening runs short once a floor is involved.<\/p>\n<h2>Price the opening while you are standing in front of it<\/h2>\n<p>SimplyWise Cost Estimator turns a photo of the wall into an itemized estimate in about 6 seconds. Material and labor lines carry unit, quantity and price per unit. It is $29.99 a month or $239.99 a year, about $20 a month on annual, with a <a href=\"https:\/\/www.simplywise.com\/blog\/pricing\/\">7 day free trial<\/a>.<\/p>\n<div class=\"pm__next\">\n<h2>Keep reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/construction-calculators\/\">Construction Calculators Hub<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/what-is-a-punch-list\/\">What Is a Punch List<\/a><\/li>\n<li><a href=\"https:\/\/www.simplywise.com\/blog\/drywall-installation-cost\/\">Drywall Installation Cost<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"pm__sources\">\n<h2>Sources<\/h2>\n<h3>Code text and span tables<\/h3>\n<ul>\n<li><a href=\"https:\/\/ashtabulacounty.gov\/DocumentCenter\/View\/4675\" rel=\"noopener\" target=\"_blank\">Ashtabula County, Ohio: Table 602.7(1) girder and header spans, exterior bearing walls, with footnotes a through f<\/a> (2026-09-14).<\/li>\n<li><a href=\"https:\/\/humboldtcountynv.gov\/DocumentCenter\/View\/3391\/Header-Table\" rel=\"noopener\" target=\"_blank\">Humboldt County, Nevada and City of Winnemucca: 2018 IRC header schedule, second jurisdiction<\/a> (2026-09-14).<\/li>\n<li><a href=\"https:\/\/up.codes\/viewer\/connecticut\/irc-2021\/chapter\/6\/wall-construction\" rel=\"noopener\" target=\"_blank\">2021 IRC Chapter 6, Connecticut<\/a> (2026-09-14).<\/li>\n<\/ul>\n<h3>Engineered lumber<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.weyerhaeuser.com\/woodproducts\/document-library\/document_library_detail\/tj-9000\/\" rel=\"noopener\" target=\"_blank\">Weyerhaeuser Trus Joist guide TJ-9000, July 2026 edition<\/a> (2026-09-23).<\/li>\n<\/ul>\n<h3>Product<\/h3>\n<ul>\n<li><a href=\"https:\/\/apps.apple.com\/us\/app\/simplywise-cost-estimator\/id6670619664\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a>.<\/li>\n<\/ul>\n<h3>Not printed<\/h3>\n<ul>\n<li>The 50 psf snow block sat on one jurisdiction only, so none of it appears here.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<section class=\"pm__faq\">\n<div class=\"pm__inner\">\n<h2>Common questions about headers in construction<\/h2>\n<h3>Sizing and spans<\/h3>\n<details>\n<summary>What is a header in construction?<\/summary>\n<div>\n<p>The beam across the top of an opening. It carries the load the cut studs carried and passes it to the jack studs each end.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How far can a double 2&#215;10 header span?<\/summary>\n<div>\n<p>At 30 psf ground snow, No. 2 lumber and 24 ft of width, it spans 6 ft 10 in under roof and ceiling. A floor on it cuts that to 5 ft 8 in.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How many jack studs does a header need?<\/summary>\n<div>\n<p>Read the NJ column on the same row. Two each end is common, and a single jack row allows a framing anchor instead.<\/p>\n<\/div>\n<\/details>\n<h3>Materials and walls<\/h3>\n<details>\n<summary>Do nonbearing walls need a header?<\/summary>\n<div>\n<p>No. R602.7.4 says load bearing headers are not required in interior or exterior nonbearing walls.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Can I use an LVL span from these tables?<\/summary>\n<div>\n<p>No. LVL, glulam and PSL are sized off the manufacturer&#8217;s own tables, by brand and grade.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/section>\n<section class=\"pm__final\">\n<div class=\"pm__inner\">\n<span class=\"pm__eyebrow\">Size it, bill it<\/span><\/p>\n<h2>Turn the opening into a signed line item.<\/h2>\n<p>Snap a photo of the wall and get an itemized estimate in about 6 seconds. Free to try.<\/p>\n<p><a class=\"pm__btn pm__btn--lg\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">SimplyWise Cost Estimator<\/a>\n<\/div>\n<\/section>\n<\/article>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BlogPosting\",\n  \"headline\": \"What Is a Header in Construction? Spans and Sizing\",\n  \"description\": \"What is a header in construction? The beam over an opening. 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The table splits on this first.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 3,\n      \"name\": \"Set the building width and snow load\",\n      \"text\": \"Width is measured perpendicular to the ridge, at 12, 24 or 36 ft.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 4,\n      \"name\": \"Read the span and the jack studs together\",\n      \"text\": \"The size and the NJ column sit on the same row and both apply.\"\n    }\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a header in construction?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The beam across the top of an opening. It carries the load the cut studs carried and passes it to the jack studs each end.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How far can a double 2x10 header span?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"At 30 psf ground snow, No. 2 lumber and 24 ft of width, it spans 6 ft 10 in under roof and ceiling. A floor on it cuts that to 5 ft 8 in.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many jack studs does a header need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Read the NJ column on the same row. Two each end is common, and a single jack row allows a framing anchor instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do nonbearing walls need a header?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. R602.7.4 says load bearing headers are not required in interior or exterior nonbearing walls.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use an LVL span from these tables?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. LVL, glulam and PSL are sized off the manufacturer's own tables, by brand and grade.\"\n      }\n    }\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"itemListElement\": [\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 1,\n      \"name\": \"Home\",\n      \"item\": \"https:\/\/www.simplywise.com\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 2,\n      \"name\": \"Blog\",\n      \"item\": \"https:\/\/www.simplywise.com\/blog\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 3,\n      \"name\": \"How to Estimate\",\n      \"item\": \"https:\/\/www.simplywise.com\/blog\/category\/how-to-estimate\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 4,\n      \"name\": \"What Is a Header in Construction? 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Spans and Sizing A header is the beam over an opening. The size comes off one table, and that table splits by what the wall carries. [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"87","_yoast_wpseo_content_score":"90","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[181],"tags":[],"class_list":["post-9827","post","type-post","status-publish","format-standard","hentry","category-how-to-estimate"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is a Header in Construction? Spans and Sizing<\/title>\n<meta name=\"description\" content=\"What is a header in construction? The beam over an opening. 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