How To Detail Outlets On Thick Rigid Foam Walls - Insulation - DIY Chatroom Home Improvement Forum

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Old 08-03-2013, 06:03 AM   #1
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how to detail outlets on thick rigid foam walls

While I think this question might be under the topic of electrical I have a feeling that people in this group have dealt with this issue before.

I am working on a project that will re-skin my house. In the end the exterior walls will be 2 3/4" thick from the outside of the stud to the outside of the siding (1/2" plywood, Tyvek, 1"XPS, 3/4" Rainscreen, 1/2" Siding) I plan on using Quickflash ( for all wall penetrations, to tie into the tyvek. But I'm having a hard time visualizing how the details work on the outlet and 3/0 electrical boxes.

So for example the max depth on the E-SGB-C is 1 3/8". The quick flashing goes at the tyvek layer, that still leaves 2 1/4" (2 3/4 - 1/2 plywood) to the outside of the siding. That means i'm left with a 1 1/8" gap. how do I deal with that?

Most of the outdoor covers I've seen only have a small lip on the back.

Any thoughts or input would be great! pic would be even better.



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Old 08-03-2013, 07:48 AM   #2
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I hope that's not the order you plan on covering that outside wall.
I can see that being a double vapor and having moisture trapped inside the walls.
Have you checked to see how much wiring is available inside the outlet boxes.
Need enough so there's no hidden junctions in behind the wall.
Do you plan on pulling all the windows and doors and resetting them to that new wall thickness?


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Old 08-03-2013, 10:10 AM   #3
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Not to sideline the question, which is about detailing outlets not wall assembly...but yes that is order and no there is no double vapor barrier. Tyvek is vapor permeable.

The wall enclosure follows a well understand Building Science design.

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outlets , xps

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