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Old 07-10-2012, 10:49 PM   #1
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Mount electrical boxes in exterior stucco wall.


I need to install two light fixtures and an outside outlet in a stucco wall. This particular wall has no plywood. It has stucco over a 1" styrofoam board with house wrap and a quarter inch hardboard next to the studs. Total width from stud to outer edge of stucco is
1 7/8". How do I mount the electrical boxes securely in this type of wall where there is nothing to nail to?

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Old 07-10-2012, 11:05 PM   #2
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Mount electrical boxes in exterior stucco wall.


Are you trying to mount one of these ..http://www.homedepot.com/Electrical-...&storeId=10051 .

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Old 07-10-2012, 11:15 PM   #3
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Mount electrical boxes in exterior stucco wall.


Hi Copperclad,
Thanks for the quick response.
I was planning to install a basic outlet box with a waterproof cover and two 4" round boxes for the light fixtures. There is an outlet in the back wall of my house, but I can't see how the box is secured or what it is secured to.

As you know, the standard boxes are made to work with half inch sheetrock, not a 2" stucco wall. I know it can be done...just don't know how.

Ron
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Old 07-10-2012, 11:17 PM   #4
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Mount electrical boxes in exterior stucco wall.


If no plywood exist, then your really going to have to hit framing members to support the boxes.
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Old 07-10-2012, 11:19 PM   #5
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Mount electrical boxes in exterior stucco wall.


Id say take 3 5/8 hole saw and make a hole. Might take a hammer and small screw driver to get through the stucco. (not sure, we don't have stucco around here) If you land on a stud, use a pancake box. If you miss the stud, use a cut in box
http://www.platt.com/platt-electric-...spx?zpid=59872
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Old 07-10-2012, 11:22 PM   #6
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Mount electrical boxes in exterior stucco wall.


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Id say take 3 5/8 hole saw and make a hole. Might take a hammer and small screw driver to get through the stucco. (not sure, we don't have stucco around here) If you land on a stud, use a pancake box. If you miss the stud, use a cut in box
http://www.platt.com/platt-electric-...spx?zpid=59872
That box may or may not work depending on the real thickness of the stucco, not sure the maximum depth that box is good for and still have the bracket work.
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Old 07-10-2012, 11:22 PM   #7
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I'm not an electrician but I don't think a regular box will work in your application. You probably have to use a weather proof box and possibly a short piece of conduit entering the home.. There's a lot of knowledgeable electricians on this site, I'm sure they will be able to help you out.
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Old 07-10-2012, 11:24 PM   #8
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Mount electrical boxes in exterior stucco wall.


An old work box with deep madison straps might work...


In the picture they are using regular depth madison straps, but you can buy these with longer legs for a deeper material thickness....


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Old 07-10-2012, 11:28 PM   #9
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Try starting here.
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Old 07-10-2012, 11:30 PM   #10
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Mount electrical boxes in exterior stucco wall.


I have used regular metal cut ins or metal octagon cut ins and used a toggle bolt thru the ears to grab the foam insulation. All of them are still hanging from what I know.

I will agree that this is a tricky situation.
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Old 07-10-2012, 11:31 PM   #11
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Mount electrical boxes in exterior stucco wall.


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I have used regular metal cut ins or metal octagon cut ins and used a toggle bolt thru the ears to grab the foam insulation. All of them are still hanging from what I know.

I will agree that this is a tricky situation.
I've done the toggle bolt method before as well.
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Old 07-10-2012, 11:50 PM   #12
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Mount electrical boxes in exterior stucco wall.


Hey Stickboy1375, I was going to say that you are really burning the midnight oil, but it looks like you passed that marker some time ago.

I will take a look at the straps. I want to see if there is something similar for the round boxes too.

And to KbSparky, that looks like just the thing for this type of wall, but I have never seen one in any of the building supply/hardware stores that I haunt. I will call the company tomorrow to ask who their nearest distributor is....and if they make round boxes.

I'm impressed by the speed and number of responses I have received on this subject. Thanks to all of you.

Ron
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Old 07-11-2012, 12:09 AM   #13
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Mount electrical boxes in exterior stucco wall.


Quote:
Originally Posted by stickboy1375 View Post
That box may or may not work depending on the real thickness of the stucco, not sure the maximum depth that box is good for and still have the bracket work.
You can cut some of the bracket ears off, so its not so deep. If its still not deep enough you can get a longer screw


Quote:
Originally Posted by CopperClad View Post
I'm not an electrician but I don't think a regular box will work in your application. You probably have to use a weather proof box and possibly a short piece of conduit entering the home.. There's a lot of knowledgeable electricians on this site, I'm sure they will be able to help you out.
The light fixture needs to be water proof. The box doesn't need to be
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Old 07-11-2012, 12:22 AM   #14
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Mount electrical boxes in exterior stucco wall.


The problem I see with the box KB posted is that that box is made to mount to the plywood backing then the foamboard and stucco go over the flange. You may be able to get it to work, but its not going to look good IMO.
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Old 07-11-2012, 12:28 AM   #15
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Mount electrical boxes in exterior stucco wall.


I understand that jimmy. Like I said, I'm no electrician.. I just think it would be easier to drill a 3/4 hole through the stucco, fish the wire, screw the weatherproof box to the stucco, sealant caulk around the box, hook your receptacle, put your weather proof cover and be done. As I'm not an electrician, help me to understand why the box in the wall is better as I will be doing something similar shortly..

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