I’d like to add a light fixture to the outside of my house.
The exterior wall is constructed as follows: there is plywood sheathing on the studs, on top of that sheathing is hard foam insulation, on top of that insulation are 1”x 3” vertical nailers 16” on center, on top of those nailers is attached the horizontal wood siding. Thus, there is a vertical chase behind the siding every 16”.
I have an existing exterior outlet that is recessed into the wood siding.
Starting at the existing outlet box, can run a piece of UF-B cable up though the 3/4” chase (between the wood siding and the foam insulation) to a new weatherproof box to be located under the soffit for the light fixture? Or, I have to run conduit on top of the siding between the boxes?