Mark on the siding where you plan to install exterior lighting using a pencil.
Install outdoor light fixture on vinyl siding.
All we have is the vinyl trim around where it used to be with the wires sticking out of a hole in a small vinyl panel.
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.
Slide the j hook under the piece of siding you need to remove to set the j block in place.
Remove portions of the vinyl.
Cut a mounting block out of 1 inch lumber to mount a fixture on vinyl or clapboard siding.
The block should be rectangular and large enough to accommodate the base of the fixture.
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.