Flush-mount electrical panel on exterior wall: should I add insulation?
I am located in CZ2 and built a small outbuilding/workshop a while back and am finally getting around to adding electrical.
I tried to build tight with zip sheathing, liquid flash, and flashing panels for penetrations.
I would strongly prefer to flush-mount the electrical panel in between the 2×4 wall studs. My concern is that there will be no insulation in that space. Maybe I am overthinking it, but I am wondering if I should add at least a thin piece (1/2 or 3/4″) of XPS foam behind the panel. This would prevent condensation from forming on the interior metal panel in the winter. It would also be beneficial from an insulation standpoint, although I am not really concerned about that given the small size of the building (168 sq ft). However, if I add some foam board behind the panel, then I will need to deal with the interior no longer being quite flush – but I could frame that out with 1/2″ or 3/4″ wood.
Any opinions? Should I not overthink this and just flush mount the panel as normal or should I add a bit of foam board and frame out the interior of the panel?
Thanks for reading 🙂
GBA Detail Library
A collection of one thousand construction details organized by climate and house part