SR127 FireBarrier - technical reference guide (March 2004)

FireBarrier is a computer model that integrates a finite difference heat transfer model with a combination charring and structural model for timber studs or joists and a heat transfer structural model for steel studs.

The finite difference heat transfer model determines the heat transfer across a fire barrier, such as a wall or ceiling, when subjected to an elevated temperature on one side such as would be expected in a fire exposure. The internal structure may range from a timber or steel-framed cavity wall (or floor/ceiling) lined with plasterboard or other similar lining products to solid core barriers, such as concrete, which may also be lined on one or both sides.

Physical properties of the linings/barrier are updated with changing temperatures, and the changing heat transfer conditions are used to predict the failure criteria of insulation and structural adequacy. Integrity failure is not predicted.

FireBarrier has been developedusing the collective results of research conducted at BRANZ into charring rates of timber and design of lightweight timber and steel-framed walls and floors for fire resistance.