{"id":11540,"date":"2020-01-26T03:42:12","date_gmt":"2020-01-26T03:42:12","guid":{"rendered":"https:\/\/essential.construction\/cnstrctr\/glossary\/camber\/"},"modified":"2026-11-03T10:08:29","modified_gmt":"2026-11-03T17:08:29","slug":"camber","status":"publish","type":"glossary","link":"https:\/\/essential.construction\/academy\/glossary\/camber\/","title":{"rendered":"Camber"},"content":{"rendered":"<p><strong>Camber<\/strong> is a curve in the vertical plane of a structural steel member, while <strong>sweep<\/strong> is a curve in the horizontal plane. All mill-produced steel has some natural camber and sweep, and beams are often deliberately cambered upward so they deflect to level under the weight of the slab and loads.<\/p>\n<h2>Why beams are cambered<\/h2>\n<p>A long floor beam sags as wet concrete is placed on it. If it starts flat, the crew finishing the slab to a level surface will fill the sag with extra concrete (&#8220;ponding&#8221;), adding cost and weight. Cambering the beam up by roughly the predicted dead load deflection means it settles close to level once the slab is in. Camber is normally set for dead load only; live load deflection is controlled by sizing the beam.<\/p>\n<h2>Natural vs induced camber<\/h2>\n<ul>\n<li><strong>Natural (mill) camber:<\/strong> the small curve every rolled shape has. Mill tolerances for camber and sweep are set by ASTM A6. Fabricators and erectors normally set any natural camber upward.<\/li>\n<li><strong>Induced camber:<\/strong> added by the fabricator, either cold (a cambering press bends the beam at several points) or with heat (controlled V-shaped heats on one flange that shrink as they cool).<\/li>\n<\/ul>\n<p>The specified camber is usually noted on the framing plan next to the beam size (for example &#8220;W21x44 c=3\/4 in&#8221;), and the AISC Code of Standard Practice sets the fabrication tolerance on it.<\/p>\n<h2>Camber vs sweep vs deflection<\/h2>\n<table>\n<thead>\n<tr>\n<th>Term<\/th>\n<th>What it is<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Camber<\/td>\n<td>Curve in the vertical plane, built in or natural, normally crown up<\/td>\n<\/tr>\n<tr>\n<td>Sweep<\/td>\n<td>Curve in the horizontal plane (side to side)<\/td>\n<\/tr>\n<tr>\n<td>Deflection<\/td>\n<td>How much the member moves under load<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Too much or too little camber<\/h2>\n<ul>\n<li><strong>Over-cambered:<\/strong> the beam stays humped, so the slab is thin over midspan. Shear studs can end up short on cover and the floor has high spots.<\/li>\n<li><strong>Under-cambered or not cambered:<\/strong> the floor sags or uses more concrete than estimated.<\/li>\n<li>Engineers often specify less camber than the full calculated deflection because beams with end connections deflect less than predicted.<\/li>\n<li>Agree early whether the slab is poured to a constant thickness or finished to a level elevation; that decision changes how camber plays out.<\/li>\n<li>Check that beams arrive and are set crown up. Short beams are usually not cambered at all.<\/li>\n<\/ul>\n<h2>Other meanings of camber<\/h2>\n<ul>\n<li><strong>Roads:<\/strong> in the UK and elsewhere, camber is the cross-fall or crown that sheds water to the sides.<\/li>\n<li><strong>Precast and prestressed concrete:<\/strong> members bow upward from the prestress force, and the camber can grow over time.<\/li>\n<li><strong>Formwork:<\/strong> forms and <a href=\"https:\/\/essential.construction\/academy\/glossary\/shoring\/\">shoring<\/a> for concrete beams and slabs may be set with camber to offset deflection.<\/li>\n<\/ul>\n<h2>Related terms<\/h2>\n<ul>\n<li><a href=\"https:\/\/essential.construction\/academy\/glossary\/nelson-studs\/\">Nelson Studs<\/a><\/li>\n<li><a href=\"https:\/\/essential.construction\/academy\/glossary\/joist\/\">Joist<\/a><\/li>\n<li><a href=\"https:\/\/essential.construction\/academy\/glossary\/post-tension\/\">Post Tension<\/a><\/li>\n<li><a href=\"https:\/\/essential.construction\/academy\/glossary\/formwork\/\">Formwork<\/a><\/li>\n<\/ul>\n<h2>Related templates and guides<\/h2>\n<ul>\n<li><a href=\"https:\/\/essential.construction\/academy\/tutorials\/the-ultimate-guide-to-the-design-and-construction-of-structural-steel\/\">Guide to the design and construction of structural steel<\/a><\/li>\n<li><a href=\"https:\/\/essential.construction\/files\/information\/codes\/ansi-303-16-code-of-standard-practice-for-steel-buildings-and-bridges\/\">ANSI 303-16 Code of Standard Practice<\/a> (2016 edition, since updated to AISC 303-22)<\/li>\n<li><a href=\"https:\/\/essential.construction\/files\/information\/codes\/ansi-360-16-specifications-for-structural-steel-buildings\/\">ANSI 360-16 Specification for Structural Steel Buildings<\/a> (2016 edition, since updated to AISC 360-22)<\/li>\n<li><a href=\"https:\/\/essential.construction\/files\/information\/guides\/design-guide-23-constructability-of-structural-steel-buildings\/\">Design Guide 23: Constructability of Structural Steel Buildings<\/a><\/li>\n<\/ul>\n<h2>Frequently asked questions<\/h2>\n<h3>What is camber in a steel beam?<\/h3>\n<p>It is an upward curve along the beam&#8217;s length, either natural from the mill or added by the fabricator. Built-in camber offsets the sag from the weight of the concrete slab so the finished floor ends up close to level.<\/p>\n<h3>How much camber does a beam need?<\/h3>\n<p>The structural engineer calculates it from the beam&#8217;s predicted dead load deflection and shows it on the drawings. It is often set a little below the full calculated value to avoid an over-cambered beam and a thin slab at midspan.<\/p>\n<h3>What is the difference between camber and sweep?<\/h3>\n<p>Camber is curvature in the vertical plane, so the beam bows up or down. Sweep is curvature in the horizontal plane, so it bows sideways. Both exist naturally in rolled steel within mill tolerances, but only camber is normally added on purpose.<\/p>\n<h3>Should a beam be installed camber up?<\/h3>\n<p>Yes. A cambered beam is set with the crown up so the load brings it down toward level. Even uncambered beams are usually set with any natural camber facing up. A beam installed crown down will sag more than designed.<\/p>\n<h3>What is camber on a road?<\/h3>\n<p>On roads, camber means the cross-slope or crown that drains water to the edges. The term is common in the UK, Australia and other Commonwealth countries; in North America it is more often called crown or cross slope.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Camber is a curve in the vertical plane of a structural steel member, while sweep is a curve in the horizontal plane. All mill-produced steel<\/p>\n","protected":false},"author":1,"featured_media":2268,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"glossary-categories":[468],"glossary-tags":[505,506,507,508,509],"class_list":["post-11540","glossary","type-glossary","status-publish","has-post-thumbnail","hentry","glossary-categories-division-05-metals","glossary-tags-beams","glossary-tags-camber","glossary-tags-steel","glossary-tags-structural-steel","glossary-tags-structure"],"_links":{"self":[{"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/glossary\/11540","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/types\/glossary"}],"author":[{"embeddable":true,"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/comments?post=11540"}],"version-history":[{"count":2,"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/glossary\/11540\/revisions"}],"predecessor-version":[{"id":20369,"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/glossary\/11540\/revisions\/20369"}],"wp:attachment":[{"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/media?parent=11540"}],"wp:term":[{"taxonomy":"glossary-categories","embeddable":true,"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/glossary-categories?post=11540"},{"taxonomy":"glossary-tags","embeddable":true,"href":"https:\/\/essential.construction\/academy\/wp-json\/wp\/v2\/glossary-tags?post=11540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}