{"id":2020,"date":"2022-06-20T02:22:35","date_gmt":"2022-06-20T02:22:35","guid":{"rendered":"https:\/\/www.vikkins.com\/?p=2020"},"modified":"2026-06-20T02:51:49","modified_gmt":"2026-06-20T02:51:49","slug":"girt-offset-bypass-inset-flush","status":"publish","type":"post","link":"https:\/\/www.vikkins.com\/ar\/girt-offset-bypass-inset-flush\/","title":{"rendered":"Girt Offset Explained: Bypass \u00b7 Inset \u00b7 Flush"},"content":{"rendered":"<p><!-- ========================================================================= VIKKINS \u00b7 Girt Offset NEWS \u2014 WordPress READY body (live image URLs embedded). HOW TO USE (Classic editor): Open the post > click the \"\u4ee3\u7801 \/ Text\" tab > paste everything below > Publish.\nImages load from your media library automatically. Styling follows your theme.\nFor the full red-brand design instead, use vikkins-girt-offset-EMBED.html\nin a Gutenberg \"Custom HTML\" block or an Elementor HTML widget.\n========================================================================= --><\/p>\n<blockquote><p>In a pre-engineered metal building (PEB), the <strong>girt offset<\/strong> looks like a minor line on an order form \u2014 yet it drives steel weight, cost, thermal performance and interior clearance. When you fill out an order form or model a building, you eventually have to choose how the girts sit relative to the columns: <strong>bypass<\/strong>, <strong>inset<\/strong>, or <strong>flush<\/strong>. This is not just a detail of how they attach \u2014 it changes the girt\u2019s structural model, deciding whether the wall girts work as a <em>continuous beam<\/em> or a <em>simple span<\/em>. That, in turn, shows up in steel tonnage, cost, insulation performance and clearance.<\/p><\/blockquote>\n<h2>What a girt and its offset actually are<\/h2>\n<p>A <strong>girt<\/strong> is a horizontal secondary framing member that runs along the wall between the main-frame columns and endwall columns. Its job is to support the wall panels and transfer wind load back to the primary frame. Girts are usually cold-formed Z (Zee) sections, in common depths of <strong>8\u2033 \/ 10\u2033 \/ 12\u2033<\/strong> (\u2248200 \/ 250 \/ 300 mm) and gauges of 16 \/ 14 \/ 13 \/ 12.<\/p>\n<p><strong>Girt offset<\/strong> is the distance from the sidewall or endwall <strong>\u201csteel line\u201d<\/strong> (the wall datum plane) to the <strong>outside face of the supporting column flange<\/strong>. This single dimension fixes the relative position of column, girt, panel and insulation \u2014 and therefore whether the girt is engineered as a continuous beam or a simple span. The three standard conditions: bypass 8\u2033\/10\u2033\/12\u2033 (some makers list 9-1\/2\u2033), inset 1\u2033, and flush 0\u2033.<\/p>\n<h2>The three conditions in one view<\/h2>\n<figure><img decoding=\"async\" src=\"https:\/\/vikkins.com\/wp-content\/uploads\/2026\/06\/girt-offset-bypass-inset-flush-comparison-scaled.png\" alt=\"Girt offset comparison \u2014 bypass vs inset vs flush in pre-engineered metal buildings\" \/><figcaption>Plan section through the wall (exterior at top). Red = girt, grey = column, hatch = blanket insulation, dashed line = steel line.<\/figcaption><\/figure>\n<h2>How each condition behaves<\/h2>\n<h3>Bypass \u2014 offset 8\u2033 \/ 10\u2033 \/ 12\u2033 \u00b7 continuous beam<\/h3>\n<figure><img decoding=\"async\" src=\"https:\/\/vikkins.com\/wp-content\/uploads\/2026\/06\/girt-offset-bypass-diagram.png\" alt=\"Bypass girt offset diagram \u2014 continuous girts lapped outside the columns, insulation not compressed\" \/><figcaption>Bypass \u2014 girts run outside the columns and lap at each column; the column sits back into the girt cavity.<\/figcaption><\/figure>\n<p>Girts run entirely on the <strong>outside<\/strong> of the columns and <strong>lap<\/strong> at each column, forming a member that is <strong>continuous<\/strong> along the building length. Engineered as a continuous beam, the mid-span moment drops, thinner sections can be used, and the system is stiffer, lighter and cheaper \u2014 the most economical and most common choice.<\/p>\n<ul>\n<li><strong>Strengths:<\/strong> lowest steel weight and cost; stiffer system; column set back so blanket insulation is <strong>not compressed<\/strong> at columns (fewer thermal bridges); can be lapped (cheapest) or butted (eases future openings).<\/li>\n<li><strong>Trade-offs:<\/strong> column occupies the girt cavity (standard clearance); an air space equal to the girt depth sits between column and panel.<\/li>\n<\/ul>\n<h3>Inset \u2014 offset 1\u2033 \u00b7 simple span<\/h3>\n<figure><img decoding=\"async\" src=\"https:\/\/vikkins.com\/wp-content\/uploads\/2026\/06\/girt-offset-inset-diagram.png\" alt=\"Inset girt offset diagram \u2014 column 1 inch inside the steel line, girts butt as a simple span, insulation compressed\" \/><figcaption>Inset \u2014 column flange sits about 1\u2033 inside the steel line; girts butt between columns as a simple span.<\/figcaption><\/figure>\n<p>The column outer flange sits about <strong>1\u2033 (\u224825 mm)<\/strong> inside the steel line; girts are inset and <strong>butt<\/strong> between columns. They cannot span continuously past the columns, so they are designed as a <strong>simple span<\/strong>.<\/p>\n<ul>\n<li><strong>Strengths:<\/strong> columns set back give noticeably more clearance between columns; smaller air space.<\/li>\n<li><strong>Trade-offs:<\/strong> simple-span action requires heavier girts, raising girt-system cost by <strong>30%\u2013100%<\/strong>; insulation is compressed at the columns (thermal bridge).<\/li>\n<\/ul>\n<h3>Flush \u2014 offset 0\u2033 \u00b7 simple span<\/h3>\n<figure><img decoding=\"async\" src=\"https:\/\/vikkins.com\/wp-content\/uploads\/2026\/06\/girt-offset-flush-diagram.png\" alt=\"Flush girt offset diagram \u2014 girt face flush with column (0 inch), simple span with attachment strap, maximum insulation compression\" \/><figcaption>Flush \u2014 girt outer face is flush with the column face (0\u2033); simple span, with a strap across the flange for panels.<\/figcaption><\/figure>\n<p>The girt outer face is <strong>flush (0\u2033)<\/strong> with the column outer face. Girts connect to the column web\/flange and butt between columns as a <strong>simple span<\/strong>; a strap is typically added across the column flange for panel attachment.<\/p>\n<ul>\n<li><strong>Strengths:<\/strong> flattest interior wall and the most usable floor area; no exterior air space; suits drywall and masonry finishes.<\/li>\n<li><strong>Trade-offs:<\/strong> simple span means higher steel weight and extra attachment material; insulation compression at columns is the greatest of the three.<\/li>\n<\/ul>\n<h2>Side-by-side comparison<\/h2>\n<table>\n<thead>\n<tr>\n<th>Condition<\/th>\n<th>Offset<\/th>\n<th>Structural model<\/th>\n<th>Steel weight \/ cost<\/th>\n<th>Insulation at column<\/th>\n<th>Column clearance<\/th>\n<th>Typical use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Bypass<\/strong><\/td>\n<td>8\u2033\/10\u2033\/12\u2033<\/td>\n<td>Continuous (lapped)<\/td>\n<td>Lowest<\/td>\n<td>Not compressed<\/td>\n<td>\u0642\u064a\u0627\u0633\u064a<\/td>\n<td>Default choice; high wind \/ large bays<\/td>\n<\/tr>\n<tr>\n<td><strong>Inset<\/strong><\/td>\n<td>1\u2033<\/td>\n<td>Simple span (butted)<\/td>\n<td>+30\u2013100%<\/td>\n<td>Compressed<\/td>\n<td>Greater<\/td>\n<td>When more column clearance is needed<\/td>\n<\/tr>\n<tr>\n<td><strong>Flush<\/strong><\/td>\n<td>0\u2033<\/td>\n<td>Simple span (butted)<\/td>\n<td>High<\/td>\n<td>Most compressed<\/td>\n<td>Large \/ flat wall<\/td>\n<td>Flat interior; maximum floor area<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>How big is the cost gap?<\/h2>\n<p>For a <strong>100\u2032 \u00d7 200\u2032 \u00d7 16\u2032<\/strong> building (\u224830.5 \u00d7 61 \u00d7 4.9 m) with <strong>25\u2032<\/strong> (\u22487.6 m) column spacing, switching from bypass to inset\/flush adds more than <strong>4,000 lb<\/strong> of girts (\u22481.8 t) \u2014 about a <strong>+95%<\/strong> girt-system weight increase and roughly <strong>+8%<\/strong> on whole-building steel. On a cost basis, a separate data set shows the girt system rising about <strong>70%<\/strong> and the overall project about <strong>3%<\/strong> (~+$3,000). The gap widens with higher wind loads and larger bay spacing.<\/p>\n<p><em>Source: published engineering tips from North American PEB makers (American Buildings \/ Kirby Building Systems). Figures are order-of-magnitude; final project design governs.<\/em><\/p>\n<h2>Girt selection logic<\/h2>\n<ol>\n<li><strong>Default to Bypass.<\/strong> With no special requirement, bypass wins on steel weight, stiffness, insulation and cost \u2014 and the advantage grows with larger bays and higher wind loads.<\/li>\n<li><strong>Need more clearance between columns?<\/strong> Consider Inset \u2014 the 1\u2033 offset pulls the columns back, at a higher cost.<\/li>\n<li><strong>Need a flat interior or maximum floor area?<\/strong> Consider Flush, accepting higher cost and an insulation penalty.<\/li>\n<li><strong>Energy-sensitive project?<\/strong> Watch the thermal bridge: inset and flush compress insulation at each column.<\/li>\n<li><strong>Future openings planned?<\/strong> Use a butted (simple) bypass for easier field locating.<\/li>\n<\/ol>\n<h2>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n<p><strong>What exactly does girt offset measure?<\/strong><br \/>\nThe distance from the wall steel line (the wall datum plane) to the outside face of the supporting column flange.<\/p>\n<p><strong>Why is a bypass girt more steel-efficient?<\/strong><br \/>\nThe girts lap at each column to form a continuous beam, lowering the mid-span moment so thinner sections can carry the load. Inset and flush girts are simple spans and must be heavier.<\/p>\n<p><strong>What is the difference between inset and flush?<\/strong><br \/>\nInset has a ~1\u2033 offset with the column slightly set back, giving more clearance. Flush has a 0\u2033 offset with the girt face level with the column face for the flattest interior and maximum floor area. Both are simple spans and cost more than bypass.<\/p>\n<p><strong>Which condition is best for insulation?<\/strong><br \/>\nBypass \u2014 the column sits back inside the girt cavity, so blanket insulation is not compressed at the columns.<\/p>\n<p><strong>Which one do you usually recommend?<\/strong><br \/>\nBypass for most projects. Choose inset or flush only when you specifically need greater column clearance or a flat interior \/ maximum floor area.<\/p>\n<h2>Talk to VIKKINS<\/h2>\n<p>VIKKINS delivers turnkey pre-engineered steel buildings across the Americas \u2014 Canadian engineering standards, efficient manufacturing, and a track record of 362+ projects in 90+ countries (EN \u00b7 ES \u00b7 FR \u00b7 \u4e2d\u6587). Send us your project parameters and our engineering team will balance cost, clearance and thermal performance. <a href=\"https:\/\/www.vikkins.com\/ar\/%d8%a7%d8%ad%d8%b5%d9%84-%d8%b9%d9%84%d9%89-%d8%b9%d8%b1%d8%b6-%d8%a3%d8%b3%d8%b9%d8%a7%d8%b1\/\" target=\"_blank\" rel=\"noopener\">Talk to VIKKINS Engineering<\/a> or email <a href=\"mailto:sales@vikkins.com\">sales@vikkins.com<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>In a pre-engineered metal building (PEB), the girt offset looks like a minor line on an order form \u2014 yet it drives steel weight, cost, thermal performance and interior clearance. When you fill out an order form or model a building, you eventually have to choose how the girts sit relative to the columns: bypass, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2022,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[],"class_list":["post-2020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-knowledge"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/posts\/2020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/comments?post=2020"}],"version-history":[{"count":2,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/posts\/2020\/revisions"}],"predecessor-version":[{"id":2026,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/posts\/2020\/revisions\/2026"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/media\/2022"}],"wp:attachment":[{"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/media?parent=2020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/categories?post=2020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vikkins.com\/ar\/wp-json\/wp\/v2\/tags?post=2020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}