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Packing is the process and/or the materials used in filling bothservicepenetrations andbuilding joints with backer materials as approved components within afirestop.
Packing with inherently fire-resistive materials, such as rockwool or ceramic fibre is intended to protectsealants that would, on their own, be consumed by thefire. Lesser packing, such asfoam backer rod or fibreglass are used simply to hold up materials that can survivefire testing on their own. In both cases, the packing is placed in such a way as to control the exact depth of the materials that top off the seal.
