Choose the system before applying heat
The first decision is whether a system compatible with the design can avoid open flames or hot material. A cold-applied alternative may remove an ignition source, although its adhesives or solvents also require assessment. Selection must reflect the design and the actual roof conditions.
Before authorising the task, identify roof layers, insulation, junctions and cavities. A surface that appears non-combustible may conceal timber or combustible debris. Using a torch to dry an unfamiliar substrate is not harmless and cannot serve as a way of discovering its composition.
Control hot material and its supply
Kettles, containers and delivery lines must suit the material and follow the manufacturer’s instructions. Supports and fixings need to withstand their intended use. A displaced pipe or failed connection can direct hot bitumen towards people who are not involved in applying the roofing system.
Fuel hoses need separation from heat and potential spills, protection against damage and a planned route. Containers, clothing and face and hand protection should be selected for the thermal hazard. Gas equipment also creates specific risks involving storage, leakage and ignition.
Protect the building and the access routes
Control of Fire risk must include areas below and beside the roof, particularly in occupied buildings. Coordinate the activity with those responsible for the premises and prepare alarm and response arrangements. Ventilation and work location should prevent fumes from reaching people or air intakes.
Edges, rooflights and fragile surfaces remain hazards while waterproofing takes place. Equipment, rolls and containers must not overload the structure or obstruct access. Plan collective fall protection alongside the thermal work so that an application task does not force someone towards an unprotected opening.
Risk continues after the torch is extinguished
Fire monitoring should continue during breaks and after completion, including locations where heat could have travelled out of sight. The monitoring duration and checks depend on materials, configuration, assessment and authorisation conditions. Documented closure confirms that these checks were completed, rather than merely recording that the roofer has left the roof. A hidden smouldering area can develop into a fire after the visible activity has stopped.
