To stop water from getting behind the block at the top slip a drip cap between the siding and wrap.
How to add exterior light fixture in cedar siding.
The mounting blocks are paintable and available in different sizes and profiles to fit most types of flat and lap vinyl siding styles.
Add the light bulb to the fixture.
However light fixtures must be secured to an electrical box.
After looking around at flashing techniques which is not easy to find details on i think the best bet is to cut a block the size of the light base trace it onto the siding and cut out the siding.
Squeeze a fat bead of caulk around the perimeter of the cutout press the block into it and drive a screw through each pilot hole and into the sheathing.
How to install an exterior light fixture on siding.
Run electric cable from the nearest point of connection to the hole and push the end through.
Be sure to turn the breaker off when you connect the.
Now attach the fixture to the outlet box.
Give yourself at least.
The block we show here has a built in electrical box so you don t need the one in the wall.
Choose a location for the fixture and run power to that location through the inside wall.
Since you will have to install an electrical box to attach the fixture to i would place the box where the light will go trace around it and cut out the offending siding so you will be back to the osb backing.
You can then attach the pancake box to the osb run your wire into it and place your light attaching it to the pancake box.
Attach the fixture to the exterior wall using the mounting holes inside the j block.
You don t have to cut into the siding to mount the block.