Structural · S-HWG65

Openings & Reinf. for Conduits in Concrete

Materials

Concrete Reinforced Concrete Steel

Elements

Beams Bearing Walls Columns Floors / Slabs Foundations / Footings Reinforcing Roof / Floor Openings Shear Walls Walls

Connections

Rebar Splice / Development

About this detail

This structural detail provides sizing, spacing, and reinforcement guidelines for conduit penetrations in concrete walls. Rectangular openings require one inch of clear space on all sides, while circular openings require a diameter two inches larger than the nominal conduit size. Multiple horizontal or vertical conduits must maintain a minimum clear spacing of four inches or the maximum diameter of adjacent openings. For clustered conduits, a single large opening up to four feet wide by two feet high is permitted with engineer approval. Where wall reinforcing is interrupted by penetrations larger than ten inches by ten inches, matching steel trim bars must be provided with lap lengths equal to twice the standard lap splice length plus the opening dimension.

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