I'm adding an outlet box to the wall over my deck by drilling a penetration through the wall just to feed the cable through. Will air seal with expanding foam and caulk and feed into a surface mounted exterior weather proof box and outlet cover through the backside of the box.
In addition to caulking the perimeter of the box before screwing it into the siding was thinking of installing a small section of L flashing tucked up into the lap of siding above the box to help minimize water dripping directly onto the top of the box and relying solely on the caulk to seal, but almost every video or how to I see of these retrofit installs has the box just mounted directly to the exterior. (I was thinking of it like the flashing detail on top of a window install around the siding)
Am I being overly cautious or would this somehow affect the rest of the water barrier system of the siding?