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Old 12-25-2014, 10:24 PM   #1
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Making outside light electrical boxes waterproof


Hi everyone. I'm wondering how to make the electrical box for outside lights waterproof.

We have to use emt so currently setup is: metal electrical box, round mud ring (one of these: http://m.homedepot.com/p/Steel-City-...25R/202590481/), a mounting bracket (similar to this one: http://www.engproducts.com/products/...ing-Bracket-1/), vinyl siding mounting box, then the light.

So, other than the light and the mounting box, the electrical box is open to the elements. It seems like there should be something between the box/mud ring and mounting bracket to make it waterproof.

Is this thinking correct? If so, what should be there?

Thanks!
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Old 12-25-2014, 10:35 PM   #2
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https://ca.images.search.yahoo.com/y...yhs-rogers_001

have a look here
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Old 12-25-2014, 11:41 PM   #3
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Thanks for the reply.

I see lots about waterproof electric outlets (which we have) but not wall lights...
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Old 12-26-2014, 07:33 AM   #4
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Quote:
Originally Posted by wewantutopia View Post
I'm wondering how to make the electrical box for outside lights (or anything else) waterproof.
It's not possible. The BEST you can hope to achieve is water resistance for these surface mounted applications is by using exterior rated boxes (eg red dot) with gaskets.

Quote:
It seems like there should be something between the box/mud ring
and mounting bracket to make it waterproof.

If so, what should be there?
When a junction box and the wiring is INSIDE the line of the house...
a lesser standard is adequate and usually sufficient. The alternate box and trim choices available are usually based around the aesthetics of matching the house, the trim, the siding ...not wire safety.

What kind of exterior veneer do you have?
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Old 12-26-2014, 08:14 AM   #5
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Thanks for the reply.

The emt is in the wall with an octagonal box. The exterior is covered in 1.5" foil faced polyiso so there is a box extender to make it flush with the foam.

Most of the house is clad in vinyl siding so they are covered by a vinyl mounting box (how ever waterproof that is)

The area I'm currently working on will be clad in stone veneer so it will get a third extension box, but there will be no vinyl mounting box. (We haven't decided what mounting box we will use).

I can't believe it is allowable by code to leave the box essentially open on a wall outside .
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Old 12-26-2014, 08:38 AM   #6
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Quote:
Originally Posted by wewantutopia View Post
Most of the house is clad in vinyl siding so they are covered by a vinyl mounting box (how ever water resistant that is)
They're fine. And again, their main function is to provide a FLAT surface to mount to and a square edge to set vinyl siding/channel against. NOT water protection. Before those things were common...

Quote:
...to leave the box essentially open on a wall outside.
The light fixture does have a shroud right?

In 99.8756% of such installations over the last 100 years or so the only common faults are insects and some rust. Really.

Is your fixture in a spot likely to be flooded on any sort of regular basis?
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Old 12-26-2014, 08:59 AM   #7
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Yep it has a shroud. Don't get me wrong, I'm not having any problems. Mostly just curious.

I picture water running down a wall, between the shroud and wall/mounting box and into the electrical box.
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Old 12-26-2014, 09:21 AM   #8
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Under an eave?
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Old 12-26-2014, 09:50 AM   #9
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Quote:
Originally Posted by wewantutopia View Post
Yep it has a shroud. Don't get me wrong, I'm not having any problems. Mostly just curious.

I picture water running down a wall, between the shroud and wall/mounting box and into the electrical box.
clear silicone caulking around the canopy. Leave the bottom uncaulked to allow any water that may get in to drain.
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