Junction box type for exterior sconce?

measure_twiceSeptember 21, 2013

What type of junction box is appropriate for an exterior sconce light mounted flush to the siding? This is a little different because there is 1" exterior rigid foam insulation.

I am not sure if it has to be waterproof or can project through the sheathing or maybe a 1/2" pancake box is enough.

1. There is not a 2x4 stud located where I want to to mount the light (of course). It is right between studs 16" on center.
3. The wall is 1/2 osb, then 1" exterior rigid foam, then vinyl siding.
4. The sconce back is a flat rectangle 10" high by 8" wide.
5. it weighs under 6 lbs

Thank you for reporting this comment. Undo
Ron Natalie

They make specific lighting boxes for this application, they are usually round and while not necessarily waterpoof, they're typically painted or made of plastic that's not going to corrode in such an environment. You'll have to check the instructions for the fixture, but most decorative ones won't work on just a pancake box.

It sounds like with our exterior foam insulation, you might have sufficient depth there for this box (just screwed to the disoriented strand board).

    Bookmark   September 22, 2013 at 9:06AM
Thank you for reporting this comment. Undo

Thank you, ronnatalie. I looked at and measured the round boxes. They were 1 1/2" to 2" deep, too deep for the 1" rigid foam. Oh foo.

I finally got an adjustable depth single gang PVC box. I put a 2x4 cleat across the space and an 18" long stud vertically to hang the box. The metal bracket fastens to the face of the 2x4 so I first fastened the box to the wood then rotated it to the outside and fastened the stud vertically.

The adjusting screw made it simple to set the box exactly to the face of the foam. I will add a vinyl mounting block and flashing tape to divert rain around the j-box.

    Bookmark   September 22, 2013 at 7:20PM
Sign Up to comment
More Discussions
Light/Switch wiring
Here is the scenario. Have a kitchen light that needs...
can homeowner so electrical work in his own home ? (above ground pool)
I live in Western ma and I'm having an Adobe ground...
Wiring in a 1 1/2" thick wall cavity
I need to run 12/2 wire thru an existing thin wall....
Please Critique Low-Volt (Home Automation) Plan/Proposal
GW/Houzz Community, As always, I want to thank this...
Andrew K.
Badly done multi-wire circuits (previous owner strikes again..)
I bought a 1940-ish house last year, for which the...
Sponsored Products
Antique Copper Small Bowl Wall Sconce with Shards Cutout Design
$106.20 | Bellacor
Lifetime 50-gallon Compost Tumbler
Chambord Weathered Copper 1-Light Sconce
$68.31 | PLFixtures
Glomar Wall Mounted 1-Light Outdoor Old Bronze Incandescent Sconce Light HD-986
$37.99 | Home Depot
Sphere Fountain
$1,533.00 | Horchow
Kichler Sarabella Traditional Wall Sconce
Serena & Lily Silk Shantung Window Panel
Serena & Lily
'At the Lake' Wood Box Sign
$7.99 | zulily
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™