The Code Authority Q&A: Angled Penetrants and Firestopping

Questions and answers

Q: When installing firestopping for a penetrating item into or through a fire-resistance-rated assembly, does the penetrating item have to be at 90 degrees perpendicular to the assembly?

A: The penetrant may pass through the opening in the wall or floor assembly at any angle, provided the annular space is maintained on both sides of the wall or floor assembly, and all other specifications in the design are satisfied. Where necessary, systems will indicate if the angle is restricted to a specific range.

Q: Is an angled penetration allowed for any firestop system?

A: Angled penetrations are only allowable for specific materials that have been tested in this manner or if the material meets the guidance set forth in the XHEZ GuideInfo. This guidance allows angled installation of penetrants that are uninsulated and consist of metallic pipe, conduit, tube, duct or cable and the firestop system utilizes a Fill, Void or Cavity Material (XHHW) (such as sealants, putty or mortar).

Q: If the penetrant is not a metallic pipe, conduit, tube, duct or cable, what angle for installation is acceptable?

A: Except where otherwise indicated in the system, the penetrating item should penetrate the wall or floor assembly at an angle of 90 degrees. 

Q: Where can I find further information on penetrations and firestop systems? 

A: Further information can be found using UL Product iQ^® by referring to the XHEZ GuideInfo. 

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