Major fires occurring during the restoration, maintenance, and renovation phases of historical and monumental structures exhibit globally similar ignition and propagation dynamics due to hot work hazards (welding, blowtorches), electrical overloads, chemical solvent residues, and the high fire load of aged timber roof trusses.

Major Historical Structure Fires Originating from Restoration and Renovation

Historical Structure / LocationYearRenovation / Construction PhaseIgnition and Fire Dynamics
Børsen (Old Stock Exchange) Copenhagen, Denmark2024400th-anniversary comprehensive roof and facade restoration, scaffolding encapsulationFire originated in the attic beneath scaffolding, causing the complete collapse of the 17th-century copper-clad timber spire (Drakenspir).
Notre-Dame Cathedral Paris, France2019Timber spire (Flèche) and roof lead-cladding restorationFire ignited in the 12th-century timber roof framework (“La Forêt”), leading to the collapse of the spire and portions of the stone rib vaulting.
Glasgow School of Art (Mackintosh) Glasgow, Scotland2018£35M comprehensive reconstruction following the 2014 fireNear the completion phase, the fire spread rapidly throughout the building via ventilation ducts and accumulated paint/timber residues, completely gutting the structure.
Basilica of Saint-Donatien-et-Saint-Rogatien Nantes, France2015Roof waterproofing and metal flashing repairOpen flames from a gas blowtorch (flame-welding) used by roofers for bitumen membrane waterproofing ignited the underlying timber framework.
Haydarpaşa Railway Station Istanbul, Turkey2010Roof insulation and timber frame repairLiquid membrane flame-melting and chemical adhesives applied during roof insulation ignited the dry timber attic, completely destroying the roof structure.
Gran Teatre del Liceu Barcelona, Spain1994Stage mechanics and steel framework modernizationSparks from arc welding performed backstage ignited adjacent flammable velvet curtains; the historic opera house was reduced to ashes.
Windsor Castle Berkshire, England1992Comprehensive restoration, rewiring, and chamber renovationA high-intensity restoration spotlight left in prolonged contact with a fabric curtain inside Brunswick Tower ignited a blaze that destroyed 115 rooms.
Teatro La Fenice Venice, Italy1996Acoustic retrofitting and electrical modernizationArson and gross negligence by electrical subcontractors facing heavy contract delay penalties resulted in the total destruction of the historic opera house.

Common Technical Risk Factors in Heritage Construction Fires

  1. “Hot Works” and Thermal Insulation Failures: Slag, sparks, and open flames generated by blowtorches, flame cutters, angle grinders, and arc welding contacting centuries-old dry timber dust within enclosed structural voids.
  2. Chemical Contamination and Volatiles: Combustible vapor concentrations (VOC accumulation) generated by solvents, thinners, varnishes, and chemical rust removers trapped in unventilated spaces or absorbed by disposable cellulose wipes.
  3. Temporary Site Electrical Networks: Overloading, improper grounding, or short-circuiting in high-amperage temporary cables powering heavy compressors, heaters, and construction hoists.
  4. Deactivation of Fire Detection Systems: Temporary bypassing or physical masking of optical and ionization smoke detectors to prevent false alarms caused by construction dust, leaving the site without active early-warning coverage.

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