15 Hot Work Permit Guidelines I. Hot Work Fire Facts The top ten materials most frequently ignited by welding torches in non-residential structure fires 1. Thermal or acoustical insulation (11%) 2. Unclassified form of material (9.8%) 3. Structural member or framing (9.6%) 4. Rubbish, trash or waste (6.7%) 5. Dust, fiber, or lint (6.6%) 6. Exterior roof covering or finish (5.8%) 7. Accelerant or other gas or liquid in or from pipe or container (4.0%) 8. Fuel (3.9%) 9. Interior wall covering (3.9%) 10. Box, carton, or bag (3.7%) The top ten areas of fire origin for non-residential welding torch structure fires 1. Maintenance shop or area (11.9%) 2. Process or manufacturing area (8.8%) 3. Attic, ceiling/roof assembly, or concealed space (6.5%) 4. Wall assembly or concealed space (6.5%) 5. Garage (6.5%) 6. Machinery room or area (5.6%) 7. Product storage area, tank, or bin (4.9%) 8. Exterior roof surface (4.6%) 9. Exterior wall surface (3.6%) 10. Duct (3.0%)
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