The block should be rectangular and large enough to accommodate the base of the fixture.
How to install outside receptacle on siding.
Guide the end of the 12 2 cable through the hole in the middle of the exterior box and push the box against your siding.
How to add a household outlet or receptacle to a house outside wall etc.
Then strip about two feet of sheathing off the end of the cable and cut off two of the three wires.
If the outdoor box is metal install two grounding pigtails connecting one to the box and one to the ground screw on the gfci outlet.
Screw the outlet to the box then apply a bead of silicone around the face of the box.
Be sure to get an outlet box that s meant for exterior use.
I have seen plenty of guides online with straightforward techniques to add a plug on siding exteriors but never found a good guide for a brick exterior.
Cut a mounting block out of 1 inch lumber to mount a fixture on vinyl or clapboard siding.
Retrofitting an outdoor outlet is a bit more work than an indoor outlet especially if you live in a brick house like i do.
Screw an exterior outlet box to the outside wall so it lines up with the hole.
Start by removing a knockout in the box by hitting it with a screwdriver.
Make the wire connections between the cable and a gfci outlet.
Screw on the box cover.
If you don t want to cut a hole for a recessed electrical box you can skip this step.
Hold the outside outlet box against the exterior wall where you plan to hang it checking to make sure the box covers.
Run cable from the interior box to the hole in the exterior.
Beginning at the hole you drilled use the keyhole or saber saw to cut around the outline.
Tuck the wires neatly into the box and secure the outlet to the box using the provided screws.
Join the pigtails and the circuit ground wire.
Install the outdoor box cover as directed by the manufacturer.