For adequate support you can mount exterior light fixtures to a solid block or base which you usually install before or during the siding process.
Installing outdoor light on vinyl siding.
How to install an exterior light fixture on siding.
How to put on new exterior light fixtures with aluminum siding.
However when retrofitting lights on vinyl or aluminum siding or fixing a sagging fixture it s usually easier to buy special blocks that fit right over the siding available at home centers.
One way to improve your home s appearance at night is to install exterior lighting.
The vinyl mounting block adds stability to the electrical fixture to support it in all types of weather.
The only difference between installing interior and exterior lights is that exterior lights as well as all the wiring to which they are.
A vinyl mounting block or j block designed for light fixtures replaces a section of the vinyl siding.