{"id":23612,"date":"2025-11-05T11:01:39","date_gmt":"2025-11-05T10:01:39","guid":{"rendered":"https:\/\/incoperfil.com\/?post_type=guia-tecnica&#038;p=23612"},"modified":"2026-05-18T09:03:04","modified_gmt":"2026-05-18T07:03:04","slug":"fire-resistance-in-composite-slabs","status":"publish","type":"guia-tecnica","link":"https:\/\/incoperfil.com\/en\/guia-tecnica\/fire-resistance-in-composite-slabs\/","title":{"rendered":"8. Fire resistance in composite slabs"},"content":{"rendered":"<p data-start=\"3588\" data-end=\"3845\">A composite slab is a steel-concrete structural system capable of achieving high levels of fire resistance without the need for additional sprayed fire protection, provided that the design accounts for the slab depth and the required specific reinforcement.<\/p>\n<p data-start=\"3847\" data-end=\"4134\">Under normal service conditions, the steel deck acts as permanent formwork and structural reinforcement. In fire conditions, its structural contribution decreases as the steel temperature rises; therefore, fire resistance must be ensured by the overall behavior of the structural system.<\/p>\n<h2 data-section-id=\"14eywdh\" data-start=\"4136\" data-end=\"4188\"><span role=\"text\">Structural behavior and fire design criteria<\/span><\/h2>\n<p data-start=\"4190\" data-end=\"4293\">Fire resistance is determined in accordance with UNE-EN 1994-1-2 (Eurocode 4), based on three criteria:<\/p>\n<ul data-start=\"4295\" data-end=\"4557\">\n<li data-section-id=\"1pzfv2i\" data-start=\"4295\" data-end=\"4388\"><strong data-start=\"4297\" data-end=\"4326\">R \u2013 Load-bearing capacity<\/strong>: time during which the slab maintains structural stability.<\/li>\n<li data-section-id=\"1nrhzf7\" data-start=\"4389\" data-end=\"4467\"><strong data-start=\"4391\" data-end=\"4408\">E \u2013 Integrity<\/strong>: ability to prevent the passage of flames and hot gases.<\/li>\n<li data-section-id=\"o19t1i\" data-start=\"4468\" data-end=\"4557\"><strong data-start=\"4470\" data-end=\"4496\">I \u2013 Thermal insulation<\/strong>: limitation of temperature increase on the unexposed face.<\/li>\n<\/ul>\n<p data-start=\"4559\" data-end=\"4628\">These criteria define the <strong data-start=\"4585\" data-end=\"4607\">REI classification<\/strong> (REI 30 to REI 240).<\/p>\n<p data-start=\"4630\" data-end=\"4793\">In composite slabs, compliance is typically achieved through slab depth and bottom reinforcement, without additional protection systems in standard configurations.<\/p>\n<h2 data-section-id=\"13bpoup\" data-start=\"4795\" data-end=\"4834\"><span role=\"text\">Components and fire performance<\/span><\/h2>\n<ul data-start=\"4836\" data-end=\"5082\">\n<li data-section-id=\"bvvxmf\" data-start=\"4836\" data-end=\"4922\">Bottom reinforcement resists tensile forces and ensures load-bearing capacity (R).<\/li>\n<li data-section-id=\"k9aw6i\" data-start=\"4923\" data-end=\"5002\">The steel deck contributes to integrity (E) through its bond with concrete.<\/li>\n<li data-section-id=\"1utmur1\" data-start=\"5003\" data-end=\"5082\">Concrete provides thermal protection; slab depth is key for insulation (I).<\/li>\n<\/ul>\n<h2 data-section-id=\"bxemsi\" data-start=\"5084\" data-end=\"5133\"><span role=\"text\">Minimum slab depth and REI classification<\/span><\/h2>\n<ul data-start=\"5135\" data-end=\"5336\">\n<li data-section-id=\"6xr0dw\" data-start=\"5135\" data-end=\"5196\"><a href=\"https:\/\/incoperfil.com\/en\/profiles\/inco-70-4-composite\/\"><strong data-start=\"5137\" data-end=\"5160\">INCO 70.4 Composite<\/strong>:<\/a> 120\u2013220 mm for REI 30 to REI 240<\/li>\n<li data-section-id=\"1qflye9\" data-start=\"5197\" data-end=\"5269\"><a href=\"https:\/\/incoperfil.com\/en\/profiles\/inco-100-3-composite\/\"><strong data-start=\"5199\" data-end=\"5223\">INCO 100.3 Composite<\/strong><\/a>: greater depths depending on span and loads<\/li>\n<li data-section-id=\"ejf37l\" data-start=\"5270\" data-end=\"5336\"><a href=\"https:\/\/incoperfil.com\/en\/profiles\/inco-100-3-r-composite\/\"><strong data-start=\"5272\" data-end=\"5298\">INCO 100.3 R Composite<\/strong><\/a>: optimized for high fire resistance<\/li>\n<\/ul>\n<p data-start=\"5338\" data-end=\"5394\">Final values must be verified by structural calculation.<\/p>\n<p data-start=\"5396\" data-end=\"5505\">In some cases, an additional layer (screed or flooring) with equivalent thermal properties may be considered.<\/p>\n<h2 data-section-id=\"13vaf2u\" data-start=\"5507\" data-end=\"5535\"><span role=\"text\">Bottom reinforcement<\/span><\/h2>\n<p data-start=\"5537\" data-end=\"5758\">The reinforcement is placed continuously within the ribs, with cover defined by profile type and required classification. When combined with other reinforcement, the larger diameter may be adopted if requirements are met.<\/p>\n<h2 data-section-id=\"1ap105z\" data-start=\"5760\" data-end=\"5798\"><span role=\"text\">Additional protection measures<\/span><\/h2>\n<p data-start=\"5800\" data-end=\"5915\">Supplementary systems (sprayed coatings or suspended ceilings) may be used where required by design or regulations.<\/p>\n<h2 data-section-id=\"ebd90k\" data-start=\"5917\" data-end=\"5952\"><span role=\"text\">Materials and fire reaction<\/span><\/h2>\n<p data-start=\"5954\" data-end=\"6050\">Structural steel and concrete are classified as <strong data-start=\"6002\" data-end=\"6015\">A1 \/ A1FL<\/strong>, meaning they are non-combustible.<\/p>\n<h2 data-section-id=\"4d7hac\" data-start=\"6052\" data-end=\"6089\"><span role=\"text\">Incoperfil composite profiles<\/span><\/h2>\n<ul data-start=\"6091\" data-end=\"6285\">\n<li data-section-id=\"1k55vb4\" data-start=\"6091\" data-end=\"6150\"><a href=\"https:\/\/incoperfil.com\/en\/profiles\/inco-70-4-composite\/\"><strong data-start=\"6093\" data-end=\"6116\">INCO 70.4 Composite<\/strong><\/a>: versatile medium-depth profile<\/li>\n<li data-section-id=\"zmth7s\" data-start=\"6151\" data-end=\"6206\"><a href=\"https:\/\/incoperfil.com\/en\/profiles\/inco-100-3-composite\/\"><strong data-start=\"6153\" data-end=\"6177\">INCO 100.3 Composite<\/strong><\/a>: suitable for medium spans<\/li>\n<li data-section-id=\"1lamnvn\" data-start=\"6207\" data-end=\"6285\"><a href=\"https:\/\/incoperfil.com\/en\/profiles\/inco-100-3-r-composite\/\"><strong data-start=\"6209\" data-end=\"6235\">INCO 100.3 R Composite<\/strong><\/a>: designed for high fire resistance requirements<\/li>\n<\/ul>\n<p data-start=\"6287\" data-end=\"6348\">All profiles comply with current standards and are CE marked.<\/p>\n<h2 data-section-id=\"1u957ut\" data-start=\"6350\" data-end=\"6368\"><span role=\"text\">Conclusion<\/span><\/h2>\n<p data-start=\"6370\" data-end=\"6575\">Fire resistance is an integral part of structural design and must be verified according to Eurocode 4. Slab depth and bottom reinforcement are the key parameters to achieve the required REI classification.<\/p>\n<h2 data-section-id=\"1jx3izz\" data-start=\"5414\" data-end=\"5438\"><span role=\"text\">Technical manual<\/span><\/h2>\n<p data-start=\"5440\" data-end=\"5498\">Refer to the Incoperfil Technical Manual for full details.<\/p>\n<hr data-start=\"5611\" data-end=\"5614\" \/>\n<p data-start=\"5500\" data-end=\"5563\" data-is-last-node=\"\" data-is-only-node=\"\">Last update: February 2026<br data-start=\"5526\" data-end=\"5529\" \/>\u00a9 Incoperfil. All rights reserved.<\/p>\n<p data-start=\"5500\" data-end=\"5563\" data-is-last-node=\"\" data-is-only-node=\"\">The technical content of this article is part of the Composite Slab Technical Manual and the documentation registered by Incoperfil with ColorIURIS (Record No. 1-INCOPERFIL-12.2025).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Incoperfil composite profiles allow the design of slabs with high REI classifications through proper slab depth and bottom reinforcement design. The fire resistance of the system is defined in accordance with European standards and is part of the structural design of the project.<\/p>\n","protected":false},"author":2,"featured_media":14116,"menu_order":9,"template":"","meta":{"_acf_changed":false},"categories":[1328],"tags":[],"class_list":["post-23612","guia-tecnica","type-guia-tecnica","status-publish","has-post-thumbnail","hentry","category-technical-guides-for-composite-flooring"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>8. 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