Warehouses and distribution centres contain enormous fire loads. Proper sprinkler design, storage classification, and fire engineering are critical to preventing catastrophic loss.. Warehouse Fire Risk Warehouses and distribution centres represent some of the highest value fire risks in commercial property. A single warehouse fire can cause losses exceeding £100 million. Fire Load Classification BS EN 12845 classifies storage hazards: Category I — low hazard storage (non combustible goods, metal products) Category II — moderate hazard (mixed commodities, furniture) Category III — high hazard (Group 1 3 plastics, aerosols, flammable liquids) Category IV — very high hazard (expanded plastics, rubber tyres) Sprinkler Design Approaches In Rack Sprinklers: Installed within the racking structure Provide direct water application to fire at point of origin Essential for storage 10m high Complex installation and maintenance ESFR (Early Suppression, Fast Response): Ceiling mounted only — no in rack sprinklers needed Large orifice heads (K25 or K34) High water pressure requirements Can protect storage up to 12 13m with limitations on commodity type Ceiling only conventional: Standard ceiling sprinklers Suitable for low category storage up to 6m Insufficient for high challenge fires in tall racking Key Design Considerations 1. Storage height — determines sprinkler system complexity and water demand 2. Commodity classification — Group 1 4 plastics dramatically affect system design 3. Aisle width — narrow aisles restrict fire service access and affect sprinkler discharge 4. Automation — automated warehouses may have no human detection of fire 5. Structural steel — unprotected portal frame steelwork is standard but vulnerable to fire induced collapse Insurance Requirements Insurance companies (particularly the RISCAuthority/FPA) often impose requirements exceeding building regulations: Sprinkler systems to LPC/FM Global standards Fire compartmentation more onerous than ADB Fire detection independent of sprinkler flow switches Fire service access and water supply provisions For warehouse fire engineering, contact us. 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.