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I have a garage which already has vinyl siding on it but the inside is unfinished and accessible. I would like to add an exterior wall lantern.

The vinyl mounting block I purchased looks like this and it is entirely hollow inside (does not contain any sort of structure behind what you see).

vinyl mounting block

The light fixture I've purchased is just a standard wall lantern with a round base similar to this:

Patriot Lighting Brookline II

I would like help understanding which electrical junction box is needed behind this and how it should be installed. In order for the light to have any structure holding it up, I believe the junction box will need to be extend past the siding to the front surface of the mounting block. Is this correct? How do I approach this setup?

  • Is using a different mounting block an option? – ThreePhaseEel Sep 16 at 2:41
  • I think so. I was just trying to avoid taking the siding off – Joe Phillips Sep 16 at 12:05
  • Can you set your new box next to a stud and use a new construction box having it come flush with the siding? To me that sounds like the solution since you have access. If you want to put it in a space away from a stud scab in some framework to nail to. – Ed Beal Sep 16 at 13:28
  • I can probably do that Ed. I'm not sure how to transition it from indoor to outdoor though. Just a small hole? – Joe Phillips Sep 16 at 13:30
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Use a mounting block with a built-in box

The simplest solution to this problem is to use a siding mounting block with a builtin pancake box, such as an Arlington 8141 (the correct part number depends on the lap depth of your siding, the 8141 is what's used with a 1/2" lap) or equivalent.

enter image description here

  • 1/2" D4 siding in my case I think – Joe Phillips Sep 17 at 0:15
  • I bought a couple of these so I'll see how they work out – Joe Phillips Sep 20 at 0:33

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