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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Vertical Penetrations

Michael Dudley
Residential Plus Real Estate Services
December 24, 2014

Vertical penetrations are considered openings between floors. What about chase walls between restrooms? It seems as though some consider this a vertical penetration. However, these plumbing chase walls usually do not penetrate the floor like a shaft does.

My question: Are plumbing chase walls considered true vertical penetrations by BOMA?


David Fingret
Extreme Measures Inc.
December 29, 2014

Hi Michael,

No. A horizontal plumbing chase is not considered a vertical penetration. However, it is sometimes difficult to determine what portion (if any) of such spaces are penetrating the floor slab without opening up the wall. We usually compare these areas from floor to floor and look for certain patterns on the plans to help us determine this.

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