Why Seperation Distances Matter in Firestopping

August 24, 2026

When designing firestopping around service penetrations, the distances between individual services and nearby openings is an important part of the overall system design.


Pipework, cables, conduits and other penetrations need to be installed within the spacing parameters covered by the relevent tested configuration. Changing those distances can influence how the firestop behaves when exposed to fire.


If the specified spacing is not maintained, there may be a greater risk of:

- Reduced fire-resistance performance

- Earlier-than-expected system failure

- Increased smoke passage

-Excessive heat transfer to surrounding services or firestopping materials


Firestop systems are tested in defined configurations, meaning that the test evidence applies to specific installation arrangements, including the seperation between penetrations.


For this reason, seperation requirements should be addressed during the design and coordination stages. Establishing the correct spacing before installation helps ensure the completed penetration matches the configuration for which the firestopping system has been assessed.


As the specialist single source distributor of firestopping materials, Blazeout are uniquely positioned to assist with your projects, supplying the correct solutions in full and on time.

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Protecta FR Collar provides an intumescent firestopping solution for suitable pipe penetrations. Available from Blazeout.
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Protecta EX Mortar is a firestopping compound for suitable service penetrations. Source Protecta EX Mortar from Blazeout, your single source supplier.
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Discover Protecta FR Board for suitable firestopping applications involving service penetrations. Available from Blazeout, a single source supplier.