Fire barrier protected dynamic joint

A fire barrier system for a dynamic joint in a structure capable of withstanding a fire test condition, the dynamic joint including a first structural element having a first attachment area and a second structural element having a second attachment area, the first and second structural elements being moveable with respect to one another, the first and second attachment areas defining a space therebetween, the space having a fixed length and a width which varies from a minimum width to a maximum width as the elements move with respect to each other, fire barrier system comprising:

• a flexible sheet of a fire barrier material comprising a first portion attached to the first attachment area by a first attachment means, a second portion attached to the second attachment area by a second attachment means, and an intermediate portion having an intermediate mass located generally in the space, at least one of the attachment means comprising an adhesive material of a type that provides an adhesive material bond having at least one of a tensile or a shear bond strength which in force units is at least equal to 1/4 of the product of the mass of the intermediate portion of the flexible sheet times 1.0 g, the fire barrier system being capable of withstanding a fire test condition, whereby the adhesive material provides a barrier to smoke passing between the flexible sheet and the first structural element.