In my condo (three floor building) the interior walls are all Fireguard-grade 5/8 drywall attached to 11 gauge structural steel studs (which SUCK except for when hurricanes blow through). Each original penetration has a fireguard “box” around it. I’m wondering if this is necessary? The construction is party wall, so there are four sheets of Fireguard between my interior and my neighbors. I’m told my interior wall is required to be 1hr firewall.

picture of drywall box inside stud cavity

  • Never seen that before. But then again my experience has all been with single family dwellings. Why don't you ask your local building/inspection department? Even if something like that is not required by code (but I don't know if that's the case or not), your jurisdiction may have stricter standards,
    – SteveSh
    Jan 4, 2020 at 16:14
  • Are there any penetrations to the other side of the wall in the adjacent stud spaces or above the junction box? Jan 4, 2020 at 16:41
  • @nosparksplease - there are not. There is a double firewall between my place and the neighbor’s interior firewall.
    – benmarks
    Jan 4, 2020 at 16:58
  • What is penetrating the firewall at this location? a few PEX water pipes? Jan 4, 2020 at 17:12
  • @ThreePhaseEel - only a 1G receptacle box. No penetration through back firewall. The blue conduit you see is smurf tube, supplying the 120v THHN.
    – benmarks
    Jan 4, 2020 at 17:30


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