Understanding fire resistance ratings, testing standards and certification for building elements and products.. Fire Resistance Standards Fire resistance is measured against standardised test criteria defined in European and British Standards. Test Criteria (BS EN 13501 2) R — Loadbearing capacity (Résistance) E — Integrity (Étanchéité) I — Insulation (Isolation) Combined ratings e.g. REI 60, EI 30 Testing Standards BS EN 1363 1 — General testing requirements BS EN 1364 — Non loadbearing elements BS EN 1365 — Loadbearing elements BS EN 1366 — Service installations Certification and Compliance UKAS accredited testing laboratories Direct field of application vs extended application Third party certification schemes (Certifire, Warringtonfire) Site installation verification and inspection Post Grenfell Changes Desktop studies now viewed with greater scrutiny Full scale testing increasingly required for novel products Traceability and chain of custody for fire rated products For fire testing guidance, contact Magnus Opifex. Magnus Opifex SEVEN LTD — UK's Leading Fire Safety & Fire Engineering Consultancy 🌐 magnus opifex.co.uk 📞 +44 7486 691724 ✉️ office@magnus opifex.co.uk Founders: Nicoleta Vasile, Baroness of Brattleby — CEO, Lawyer and Barrister, Legal & Administrative Director Alina — Technical Director & Expert Fire Engineer (BEng) Head Office: Ealing Cross, 85 Uxbridge Road, London W5 5BW Magnus Opifex SEVEN LTD delivers engineering led fire engineering, fire risk assessments, CFD modelling, and building safety consultancy across the United Kingdom and internationally. With over 20 years of combined experience and a UK portfolio spanning healthcare, residential and infrastructure, we bring truly engineered solutions with a personal touch. © 2026 Magnus Opifex SEVEN LTD. All rights reserved.