How much propane for torch-applied roofing membrane?

At 0.35 kg/m²: 35 kg total → four 11 kg cylinders with one spare, or seven 5 kg camping cylinders (more swaps, less efficient). Budget 0.4 kg/m² in winter for the same area.

Typical wide roofing burners use ~1.5–3 kg/h propane depending on flame setting. A 50 m² job at 0.35 kg/m² (17.5 kg) is roughly 6–12 hours of torch time — not one continuous hour; overlaps, roll changes and safety breaks add up.

It is a mid-range planning figure for standard 4 mm torch membrane in mild weather. Manufacturer courses sometimes cite 0.2–0.3 for skilled applicators; first-timers or thick mineral caps should use 0.4–0.45. Edit the field to match your last job log.

Professional torch roofing in Europe almost always uses propane (11 kg or 33 kg cylinders). MAP/Pro gas blends exist for plumbing torches but lack heat for wide membrane burners. Match regulator and hose to cylinder type.