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Most current US building codes require filling all holes that penetrate floors with fireblock foam. Building inspectors routinely look for it. The purpose is to slow down the spread of fire from floor to floor, similar to the firebreak blocking required in many jurisdictions in every stud bay in framed walls. This would preclude leaving pull holes and ...


If you don't run conduit, you won't be able to pull wires with a pull string going through holes in studs anyway. So you might as well firestop them (or run conduit and firestop around the outside of it.)

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