Add the light bulb to the fixture.
How to add exterior light fixture in cedar siding.
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.
Now attach the fixture to the outlet 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.
How to install an exterior light fixture on siding.
Attach the fixture to the exterior wall using the mounting holes inside the j block.
Run electric cable from the nearest point of connection to the hole and push the end through.
However light fixtures must be secured to an electrical box.
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.
Outline the back of a remodeling electrical box on the siding with a pencil and cut around the.
Drill a 1 2 inch hole in the siding at the location where you want the fixture.
Be sure to turn the breaker off when you connect the.
You don t have to cut into the siding to mount the block.
Complete the wiring connections to the exterior wall light.
The block we show here has a built in electrical box so you don t need the one in the wall.
To stop water from getting behind the block at the top slip a drip cap between the siding and wrap.
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.