How houses actually burn in a wildfire

A wildfire front passing a property is usually a matter of minutes. The danger lasts hours. Understanding the sequence is what makes a defence system worth installing.

The sequence

• Ember cast: burning fragments are lofted ahead of the front and can land several kilometres in front of it
• Accumulation: embers collect in gutters, roof valleys, under tiles, on terraces, in planters and against walls
• Smoulder: material dries further in the radiant heat and begins to smoulder, often unnoticed
• Ignition: a single smouldering point finds fuel — a beam, a pergola, a cushion — and the house becomes its own fire

By the time the front itself arrives, the outcome has usually already been decided by how dry those surfaces were.

What an installed system changes

Water applied to a roof, eaves and perimeter before the front arrives raises the moisture content of everything embers land on, and raises humidity in the air immediately around the structure. Embers land wet and die. That is the whole mechanism — there is nothing exotic about it, and that is precisely why it is reliable.

The conditions it must survive are the hard part: no mains water, no grid power, no road access, smoke, and nobody at home. That is what the engineering is for — independent water, independent power, and for the Estate system, autonomous activation without anyone present.