{"id":920981,"date":"2026-09-29T14:00:00","date_gmt":"2026-09-29T12:00:00","guid":{"rendered":"https:\/\/djya2ldob4.wpdns.site\/?page_id=920981"},"modified":"2026-10-30T10:12:37","modified_gmt":"2026-10-30T09:12:37","slug":"os18-a","status":"publish","type":"page","link":"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/os18-a\/","title":{"rendered":"SOA category OS18-A"},"content":{"rendered":"\n\n<div class=\"cqop-v6 cqop-v6-soa-categoria-os18-a\" data-v6-page=\"Categoria-OS18-A\">\n\n<div class=\"cqop-v6-pannello-829311a\" id=\"contenuto\">\n\n<div class=\"gb-text cqop-v6-pannello-fd08351\" aria-hidden=\"true\"><\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-d3705ba\" aria-hidden=\"true\"><\/div>\n\n\n\n\n\n<div class=\"cqop-v6-contenuto-06a0e85\"><nav style=\"--separator: &quot;\/&quot;\" class=\"cqop-breadcrumbs wp-block-breadcrumbs\" aria-label=\"Breadcrumbs\"><ol><li><a href=\"https:\/\/www.cqop.com\/en\/\">Home<\/a><\/li><li><a href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/\">List of SOA categories<\/a><\/li><li><a href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/\">SOA specialised works categories<\/a><\/li><li><span aria-current=\"page\">SOA category OS18-A<\/span><\/li><\/ol><\/nav>\n\n\n\n<div class=\"cqop-v6-pannello-f3875ab\">\n\n<span class=\"gb-text cqop-v6-pannello-4855609\">OS18-A<\/span>\n\n\n\n\n\n<span class=\"gb-text cqop-v6-pannello-ea96d22\">Specialised works categories<\/span>\n\n<\/div>\n\n\n\n\n\n<h1 class=\"gb-text cqop-v6-titolo-b35a3b5\">SOA category <span class=\"cqop-v6-pannello-8a3115e\">OS18-A<span aria-hidden=\"true\" class=\"cqop-v6-pannello-f4fc0bb\"><\/span><\/span><\/h1>\n\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-7496375\">Steel structural components<\/p>\n\n\n\n\n\n<div class=\"cqop-category-requirements\">\n\n<span class=\"gb-text cqop-category-requirement\"><strong>Requirements:<\/strong>Own production facility<\/span>\n\n\n\n\n\n<span class=\"gb-text cqop-category-requirement\">Certified welders and a welding coordinator<\/span>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-642d0e4\">\n\n<div>\n<p class=\"gb-text cqop-v6-testo-43af25e\"><strong class=\"cqop-v6-pannello-7f02261\">OS18-A<\/strong> covers <strong class=\"cqop-v6-pannello-7f02261\">steel structural components<\/strong>: factory production and on-site assembly of steel structures for buildings, industrial sheds, bridges and large roofs. It has one fundamental rule: the company must <strong class=\"cqop-v6-pannello-7f02261\">produce the components in its own factory<\/strong>; assembling them is not enough. 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125.9h2.2v2.2h-2.2zM64.81 125.9h2.2v2.2h-2.2zM69.35 125.9h2.2v2.2h-2.2zM73.9 125.9h2.2v2.2h-2.2zM78.45 125.9h2.2v2.2h-2.2zM82.99 125.9h2.2v2.2h-2.2zM87.54 125.9h2.2v2.2h-2.2zM92.08 125.9h2.2v2.2h-2.2zM96.63 125.9h2.2v2.2h-2.2zM101.17 125.9h2.2v2.2h-2.2zM105.72 125.9h2.2v2.2h-2.2zM110.26 125.9h2.2v2.2h-2.2zM114.81 125.9h2.2v2.2h-2.2zM119.35 125.9h2.2v2.2h-2.2zM123.9 125.9h2.2v2.2h-2.2zM128.45 125.9h2.2v2.2h-2.2zM132.99 125.9h2.2v2.2h-2.2zM137.54 125.9h2.2v2.2h-2.2zM142.08 125.9h2.2v2.2h-2.2zM146.63 125.9h2.2v2.2h-2.2zM151.17 125.9h2.2v2.2h-2.2zM155.72 125.9h2.2v2.2h-2.2zM160.26 125.9h2.2v2.2h-2.2zM164.81 125.9h2.2v2.2h-2.2zM169.35 125.9h2.2v2.2h-2.2zM173.9 125.9h2.2v2.2h-2.2z\"\/><path fill=\"#D98296\" d=\"M34.9 67.9h2.2v2.2h-2.2zM38.66 70.49h2.2v2.2h-2.2zM42.43 73.08h2.2v2.2h-2.2zM46.19 75.66h2.2v2.2h-2.2zM49.96 78.25h2.2v2.2h-2.2zM53.72 80.84h2.2v2.2h-2.2zM57.49 83.43h2.2v2.2h-2.2zM61.25 86.02h2.2v2.2h-2.2zM65.02 88.61h2.2v2.2h-2.2zM68.78 91.19h2.2v2.2h-2.2zM72.55 93.78h2.2v2.2h-2.2zM76.31 96.37h2.2v2.2h-2.2zM80.08 98.96h2.2v2.2h-2.2zM83.84 101.55h2.2v2.2h-2.2zM87.61 104.14h2.2v2.2h-2.2zM91.37 106.72h2.2v2.2h-2.2zM95.14 109.31h2.2v2.2h-2.2zM98.9 111.9h2.2v2.2h-2.2zM102.66 109.31h2.2v2.2h-2.2zM106.43 106.72h2.2v2.2h-2.2zM110.19 104.14h2.2v2.2h-2.2zM113.96 101.55h2.2v2.2h-2.2zM117.72 98.96h2.2v2.2h-2.2zM121.49 96.37h2.2v2.2h-2.2zM125.25 93.78h2.2v2.2h-2.2zM129.02 91.19h2.2v2.2h-2.2zM132.78 88.61h2.2v2.2h-2.2zM136.55 86.02h2.2v2.2h-2.2zM140.31 83.43h2.2v2.2h-2.2zM144.08 80.84h2.2v2.2h-2.2zM147.84 78.25h2.2v2.2h-2.2zM151.61 75.66h2.2v2.2h-2.2zM155.37 73.08h2.2v2.2h-2.2zM159.14 70.49h2.2v2.2h-2.2zM162.9 67.9h2.2v2.2h-2.2zM34.9 125.9h2.2v2.2h-2.2zM38.46 128.68h2.2v2.2h-2.2zM42.01 131.46h2.2v2.2h-2.2zM45.57 134.23h2.2v2.2h-2.2zM49.12 137.01h2.2v2.2h-2.2zM52.68 139.79h2.2v2.2h-2.2zM56.23 142.57h2.2v2.2h-2.2zM59.79 145.34h2.2v2.2h-2.2zM63.34 148.12h2.2v2.2h-2.2zM66.9 150.9h2.2v2.2h-2.2zM70.46 153.68h2.2v2.2h-2.2zM74.01 156.46h2.2v2.2h-2.2zM77.57 159.23h2.2v2.2h-2.2zM81.12 162.01h2.2v2.2h-2.2zM84.68 164.79h2.2v2.2h-2.2zM88.23 167.57h2.2v2.2h-2.2zM91.79 170.34h2.2v2.2h-2.2zM95.34 173.12h2.2v2.2h-2.2zM98.9 175.9h2.2v2.2h-2.2zM102.46 173.12h2.2v2.2h-2.2zM106.01 170.34h2.2v2.2h-2.2zM109.57 167.57h2.2v2.2h-2.2zM113.12 164.79h2.2v2.2h-2.2zM116.68 162.01h2.2v2.2h-2.2zM120.23 159.23h2.2v2.2h-2.2zM123.79 156.46h2.2v2.2h-2.2zM127.34 153.68h2.2v2.2h-2.2zM130.9 150.9h2.2v2.2h-2.2zM134.46 148.12h2.2v2.2h-2.2zM138.01 145.34h2.2v2.2h-2.2zM141.57 142.57h2.2v2.2h-2.2zM145.12 139.79h2.2v2.2h-2.2zM148.68 137.01h2.2v2.2h-2.2zM152.23 134.23h2.2v2.2h-2.2zM155.79 131.46h2.2v2.2h-2.2zM159.34 128.68h2.2v2.2h-2.2zM162.9 125.9h2.2v2.2h-2.2z\"\/><path fill=\"#fff\" d=\"M98.9 37.46h2.2v2.2h-2.2zM98.9 42.02h2.2v2.2h-2.2zM98.9 46.59h2.2v2.2h-2.2zM98.9 51.15h2.2v2.2h-2.2zM98.9 55.71h2.2v2.2h-2.2zM98.9 60.28h2.2v2.2h-2.2zM98.9 64.84h2.2v2.2h-2.2zM98.9 69.4h2.2v2.2h-2.2zM98.9 73.96h2.2v2.2h-2.2zM98.9 78.52h2.2v2.2h-2.2zM98.9 83.09h2.2v2.2h-2.2zM98.9 87.65h2.2v2.2h-2.2zM98.9 92.21h2.2v2.2h-2.2zM98.9 96.78h2.2v2.2h-2.2zM98.9 101.34h2.2v2.2h-2.2zM98.9 105.9h2.2v2.2h-2.2zM98.9 110.46h2.2v2.2h-2.2zM98.9 115.02h2.2v2.2h-2.2zM98.9 119.59h2.2v2.2h-2.2zM98.9 124.15h2.2v2.2h-2.2zM98.9 128.71h2.2v2.2h-2.2zM98.9 133.28h2.2v2.2h-2.2zM98.9 137.84h2.2v2.2h-2.2zM98.9 142.4h2.2v2.2h-2.2zM98.9 146.96h2.2v2.2h-2.2zM98.9 151.52h2.2v2.2h-2.2zM98.9 156.09h2.2v2.2h-2.2zM98.9 160.65h2.2v2.2h-2.2zM98.9 165.21h2.2v2.2h-2.2zM98.9 169.78h2.2v2.2h-2.2zM98.9 174.34h2.2v2.2h-2.2zM98.9 178.9h2.2v2.2h-2.2zM16.9 178.9h2.2v2.2h-2.2zM21.46 178.9h2.2v2.2h-2.2zM26.01 178.9h2.2v2.2h-2.2zM30.57 178.9h2.2v2.2h-2.2zM35.12 178.9h2.2v2.2h-2.2zM39.68 178.9h2.2v2.2h-2.2zM44.23 178.9h2.2v2.2h-2.2zM48.79 178.9h2.2v2.2h-2.2zM53.34 178.9h2.2v2.2h-2.2zM57.9 178.9h2.2v2.2h-2.2zM62.46 178.9h2.2v2.2h-2.2zM67.01 178.9h2.2v2.2h-2.2zM71.57 178.9h2.2v2.2h-2.2zM76.12 178.9h2.2v2.2h-2.2zM80.68 178.9h2.2v2.2h-2.2zM85.23 178.9h2.2v2.2h-2.2zM89.79 178.9h2.2v2.2h-2.2zM94.34 178.9h2.2v2.2h-2.2zM103.46 178.9h2.2v2.2h-2.2zM108.01 178.9h2.2v2.2h-2.2zM112.57 178.9h2.2v2.2h-2.2zM117.12 178.9h2.2v2.2h-2.2zM121.68 178.9h2.2v2.2h-2.2zM126.23 178.9h2.2v2.2h-2.2zM130.79 178.9h2.2v2.2h-2.2zM135.34 178.9h2.2v2.2h-2.2zM139.9 178.9h2.2v2.2h-2.2zM144.46 178.9h2.2v2.2h-2.2zM149.01 178.9h2.2v2.2h-2.2zM153.57 178.9h2.2v2.2h-2.2zM158.12 178.9h2.2v2.2h-2.2zM162.68 178.9h2.2v2.2h-2.2zM167.23 178.9h2.2v2.2h-2.2zM171.79 178.9h2.2v2.2h-2.2zM176.34 178.9h2.2v2.2h-2.2zM180.9 178.9h2.2v2.2h-2.2z\"\/><\/svg>\n\n<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-96ce454\">Simulate the cost of SOA certification<\/div>\n\n\n\n\n\n<a class=\"gb-text cqop-v6-pulsante-5eba899 cqop-v6-state-6d47db8\" href=\"https:\/\/www.cqop.com\/en\/online-services\/fee-and-requirements-calculation\/\">Calculate fees and requirements<\/a>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv6855 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os18a_image2-en.webp\" alt=\"Typical OS18-A types: portal-frame industrial sheds, truss bridges, tall steel-framed buildings\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">Typical OS18-A types: portal-frame industrial sheds, truss bridges, tall steel-framed buildings<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-74a4c6d\">\n\n<div class=\"cqop-v6-titolo-sticky-1c8b9f9\">\n\n<h2 class=\"gb-text cqop-v6-titolo-ecc189a\">SOA certification OS18-A: areas of application<\/h2>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-71e1793\">\n<p class=\"gb-text cqop-v6-testo-04d085f\"><strong class=\"cqop-v6-pannello-7f02261\">OS18-A<\/strong> covers all <strong class=\"cqop-v6-pannello-7f02261\">structural steelwork<\/strong>. The main sectors:<\/p>\n\n\n\n\n<ul class=\"cqop-v6-pannello-9bf0cf7\">\n\n<li class=\"gb-text cqop-v6-griglia-eaa3518\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">01<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Industrial and logistics buildings:<\/strong> frames, roof beams and bracing. It is the largest segment, driven by e-commerce and data centres.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\"><span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">02<\/span> <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Bridges and viaducts:<\/strong> truss girders, steel-concrete composite bridges, arches and footbridges.<\/span><\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">03<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Large roofs:<\/strong> stadiums, sports halls, exhibition pavilions, hangars and canopies.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">04<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Tall steel buildings:<\/strong> office towers and high-end residential buildings, a growing segment.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">05<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Pylons and towers:<\/strong> supports for power lines, antennas and floodlight towers.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">06<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Infrastructure structures:<\/strong> noise barriers, sign gantries, service walkways.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-8357285\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">07<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Seismic upgrading:<\/strong> steel frames and bracing inserted into existing buildings.<\/span>\n            <\/li>\n\n<\/ul>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-930206b\"><strong class=\"cqop-v6-pannello-7f02261\">In short:<\/strong> OS18-A is the category of <strong class=\"cqop-v6-pannello-962ca18\">heavy structural steelwork with an in-house factory<\/strong>, an excellence of Made in Italy.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv6875 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os18a_image3-en.webp\" alt=\"Structural diagram of a duo-pitch industrial portal frame: HEB columns, haunches at the joints and flanged ridge joint\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">Structural diagram of a duo-pitch industrial portal frame: HEB columns, haunches at the joints and flanged ridge joint<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-contenuto-c7714c8\">\n\n<h2 class=\"gb-text cqop-v6-titolo-e915111\">SOA categories related to OS18-A<\/h2>\n\n\n\n\n\n<div class=\"cqop-v6-griglia-86cb130\">\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS18-B<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Curtain wall components<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the <strong class=\"cqop-v6-pannello-7f02261\">\u201csister\u201d of OS18-A<\/strong>: it covers <strong class=\"cqop-v6-pannello-7f02261\">curtain walls<\/strong>. In large buildings they coexist: OS18-A for the skeleton, OS18-B for the envelope.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS13<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Precast reinforced concrete structures<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the equivalent of OS18-A <strong class=\"cqop-v6-pannello-7f02261\">in precast concrete<\/strong>: here too a factory.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS32<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Timber structures<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the equivalent <strong class=\"cqop-v6-pannello-7f02261\">in timber<\/strong> (<strong class=\"cqop-v6-pannello-7f02261\">glulam<\/strong> and <strong class=\"cqop-v6-pannello-7f02261\">CLT<\/strong>). Together with OS18-A and OS13 it forms the trio of prefabricated construction.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS11<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Special structural devices<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">covers the devices that <strong class=\"cqop-v6-pannello-7f02261\">complete steel structures<\/strong>: bridge joints, bearings and seismic devices.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG1<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Civil and industrial buildings<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is often the <strong class=\"cqop-v6-pannello-7f02261\">prevailing category<\/strong> in steel buildings; in industrial sheds, however, OS18-A can carry a lot of weight and be decisive.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG3<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Roads, motorways, bridges, viaducts, railways<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the <strong class=\"cqop-v6-pannello-7f02261\">prevailing category<\/strong> in <strong class=\"cqop-v6-pannello-7f02261\">steel bridges and viaducts<\/strong>, where OS18-A comes in as a separable category.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS21<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Special structural works<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">builds the <strong class=\"cqop-v6-pannello-7f02261\">foundations<\/strong> of steel structures: <strong class=\"cqop-v6-pannello-7f02261\">OS21 works below ground, OS18-A above<\/strong>.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS6<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Finishes in wood, plastic, metal and glass<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">covers <strong class=\"cqop-v6-pannello-7f02261\">light non-load-bearing metalwork<\/strong> (railings, gates, window and door frames), for which OS18-A is not needed.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv6916 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os18a_image4-en.webp\" alt=\"Detail of a column-beam structural joint: flanged plates, butt welds and high-strength bolts\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">Detail of a column-beam structural joint: flanged plates, butt welds and high-strength bolts<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-74a4c6d\">\n\n<div class=\"cqop-v6-titolo-sticky-1c8b9f9\">\n\n<h2 class=\"gb-text cqop-v6-titolo-ecc189a\">Why it pays to qualify in OS18-A<\/h2>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-71e1793\">\n<p class=\"gb-text cqop-v6-testo-3c2b5d5\"><strong class=\"cqop-v6-pannello-7f02261\">OS18-A<\/strong> is very selective: its own factory, certified welders. For those who meet these requirements, this is a <strong class=\"cqop-v6-pannello-7f02261\">strategic advantage<\/strong>:<br>\u00b7 <strong class=\"cqop-v6-pannello-7f02261\">major contracts<\/strong> for bridges, viaducts and logistics hubs;<br>\u00b7 <strong class=\"cqop-v6-pannello-7f02261\">high-end private construction<\/strong>, such as company headquarters and data centres;<br>\u00b7 <strong class=\"cqop-v6-pannello-7f02261\">seismic upgrading<\/strong> of public buildings;<br>\u00b7 <strong class=\"cqop-v6-pannello-7f02261\">sustainable<\/strong> projects, because steel is infinitely recyclable.<\/p>\n\n\n\n<p class=\"gb-text cqop-category-conclusion-accent cqop-v6-testo-23dd753\">If you have a metal fabrication workshop and <strong class=\"cqop-v6-pannello-962ca18\">qualified welders<\/strong>, the <strong class=\"cqop-v6-pannello-962ca18\">OS18-A is the natural next step<\/strong> towards securing <strong class=\"cqop-v6-pannello-962ca18\">major contracts<\/strong> for steel structures.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-481eee7\" id=\"faq\">\n\n<div class=\"cqop-v6-griglia-28a732f\">\n\n<div>\n\n<h2 class=\"gb-text cqop-v6-titolo-2c72ce6\">SOA category OS18-A: frequently asked questions<\/h2>\n\n\n\n\n\n<div class=\"cqop-category-download cqop-category-download-minimal cqop-category-download-faq\">\n<a class=\"gb-text cqop-category-download-button\" href=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/schede-tecniche-soa-strutturate-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"Download PDF technical data sheets \u2014 opens in a new tab\">\n<svg role=\"presentation\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.7\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"><\/path><\/svg>\n\n\n<span class=\"gb-text\">Download PDF technical data sheets<\/span>\n<\/a>\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div>\n\n<div class=\"wp-block-essential-blocks-accordion cqop-faq-accordion  root-cqop-faq-96002-0\"><div class=\"eb-parent-wrapper eb-parent-cqop-faq-96002-0 \"><div class=\"eb-accordion-container cqop-faq-96002-0\" data-accordion-type=\"accordion\" data-tab-icon=\"\" data-expanded-icon=\"\" data-transition-duration=\"500\"><div class=\"eb-accordion-inner\">\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96002-0-1 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96002-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96002-0\"><h2 class=\"eb-accordion-title\">What is the official description of category OS18-A?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96002-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-f38d055 gb-text\">OS18-A \u201cconcerns the factory production and on-site assembly of steel structures\u201d. Both production and assembly must be carried out by the company.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96002-0-2 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96002-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96002-0\"><h2 class=\"eb-accordion-title\">Why is assembling steel structures not enough?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96002-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">Because OS18-A is reserved for those who produce the components in their own factory. The factory must be owned or held under a finance lease, not on free loan, for the entire duration of the certificate. Companies that only carry out assembly may fall under other categories, such as OS6.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96002-0-6 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96002-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96002-0\"><h2 class=\"eb-accordion-title\">Which works count as CEL for OS18-A?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96002-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">Production and assembly of steel structures: beams, columns, trusses, arches, bridge decks, seismic frames. The CEL must clearly state that the company was also responsible for production, otherwise it may not be recognised.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-5e842af\">\n\n<svg focusable=\"false\" role=\"presentation\" aria-hidden=\"true\" class=\"cqop-v6-icona-71ff866\">\n      <defs>\n        <pattern id=\"mattoniOS18A\" width=\"72\" height=\"36\" patternUnits=\"userSpaceOnUse\">\n          <rect x=\"0\" y=\"2\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"36\" y=\"2\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"18\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"-18\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"54\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n        <\/pattern>\n      <\/defs>\n      <rect width=\"100%\" height=\"100%\" fill=\"url(#mattoniOS18A)\"><\/rect>\n    <\/svg>\n\n\n\n\n\n<div class=\"cqop-v6-griglia-7a21026\">\n\n<div>\n\n<h2 class=\"gb-text cqop-v6-titolo-1522a9c\">Your next move?<\/h2>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-2d399db\"><strong class=\"cqop-v6-pannello-cff7b97\">Demonstrate your requirements<\/strong> and turn this knowledge into action: make sure you have the right SOA qualification and don\u2019t hesitate to invest in training and innovation.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-4cdb9ad\">\n\n<a class=\"gb-text cqop-v6-pulsante-5eba899 cqop-v6-state-f859560\" href=\"https:\/\/www.cqop.com\/en\/contacts\/\">Contact us<\/a>\n\n\n\n\n\n<a class=\"gb-text cqop-v6-pulsante-0678f05 cqop-v6-state-b958ab0\" href=\"https:\/\/www.cqop.com\/en\/online-services\/fee-and-requirements-calculation\/\">Calculate fees and requirements<\/a>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>OS18-A Specialised works categories SOA category OS18-A Steel structural components Requirements:Own production facility Certified welders and a welding coordinator OS18-A covers steel structural components: factory production and on-site assembly of steel structures for buildings, industrial sheds, bridges and large roofs. It has one fundamental rule: the company must produce the components in its own factory; &#8230; <a title=\"SOA category OS18-A\" class=\"read-more\" href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/os18-a\/\" aria-label=\"Read more about SOA category OS18-A\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":920978,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_eb_attr":"","_eb_data_table":"","footnotes":""},"class_list":["post-920981","page","type-page","status-publish"],"acf":{"h1_seo":""},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920981","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/comments?post=920981"}],"version-history":[{"count":8,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920981\/revisions"}],"predecessor-version":[{"id":922315,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920981\/revisions\/922315"}],"up":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920978"}],"wp:attachment":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/media?parent=920981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}