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Installing electrical box for exterior light, in stucco. “new work”

severaltypesofnerd | Posted in General Questions on

What are the options for installing an electrical box for an exterior light, in newly installed stucco, in a robust manner?

I’ve found the Arlington FR420F box, which seems on the right track, but offers no air sealing whatsoever, and minimal overlap for the flange.  It offers either .5″ (too thin for rain screen) or 1.5″ (too thick).

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  1. Expert Member
    Peter Engle | | #1


    I am not clear on whether the box is being installed before the stucco (best practice) or after the stucco?

    If the stucco is already installed, about all you can do is use a surface-mounted fixture, caulk the heck out of the hole and pray.

    If the stucco is not yet installed, the Arlington boxes look like a good solution. The FR405F box looks like it is adjustable for a wide range of cladding thicknesses. That might work for you.

    Another option is to install a PVC conduit through the wall and flash it with a QuickFlash flashing. Leave the conduit long so that the stucco applicator can install the stucco right around the conduit. Then trim the conduit back and install a surface mount fixture box, sealing the box to the surface of the stucco.

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