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Unread 03-25-2020, 04:26 PM   #1
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Default Steel studs and insulated walls

What are you guys using for device boxes in insulated steel stud walls with a vapour barrier? I have tried a few things but nothing is all that great.

I put this in the Canadian forum because vapour barriers in Canada are sacred.
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Unread 03-25-2020, 04:35 PM   #2
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I would probably use welded nail on boxes with a vapor boot.

Are you using romex or AC90?

Sent from my new phone. Autocorrect may have changed stuff.
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Unread 03-25-2020, 04:42 PM   #3
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Originally Posted by Kevin_Essiambre View Post
I would probably use welded nail on boxes with a vapor boot.

Are you using romex or AC90?

Sent from my new phone. Autocorrect may have changed stuff.
I’m thinking mostly NMD. The box needs to be supported on the side opposite to the stud. If you screw a piece of 2 X 4 to the box the vapour boot gets all scrunched up.
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Unread 03-25-2020, 04:50 PM   #4
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I’m thinking mostly NMD. The box needs to be supported on the side opposite to the stud. If you screw a piece of 2 X 4 to the box the vapour boot gets all scrunched up.
Scrunched up is pretty normal... maybe plastic boxes would work better though, especially if you're using NM.

Sent from my new phone. Autocorrect may have changed stuff.
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Unread 03-25-2020, 04:51 PM   #5
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I haven't yet come across this issue, but I would use Nutek boxes with a 2x4 on one side.

Are you in AB? Because I thought we couldn't use poly hats anymore? Has to be plastic gasketed boxes (Building Code)?

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Unread 03-25-2020, 04:54 PM   #6
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If you go AC90 then you pretty much have to use a steel box with poly hats. Maybe a 2304 to fill out the hat more.

Or 4x4s with poly hats and plaster rings supported from behind.

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Unread 03-25-2020, 04:58 PM   #7
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Originally Posted by Mobius87 View Post
I haven't yet come across this issue, but I would use Nutek boxes with a 2x4 on one side.

Are you in AB? Because I thought we couldn't use poly hats anymore? Has to be plastic gasketed boxes (Building Code)?

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I haven’t heard that but I haven’t done much resi lately. I better check it out because I’m doing a resi job right now.

What about AC90 jobs? You can’t get NuTek boxes for armoured cable can you?

Edit: Actually you can (single gang only).
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Last edited by 99cents; 03-25-2020 at 05:03 PM.
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Unread 03-25-2020, 04:59 PM   #8
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It's interesting because these plastic boxes with the flange for that purpose are here, but I don't think too many places require them. I'd like to see what one of these looks like, plastic with the tabs to screw to steel studs with the foam on flange. Such a thing exists?
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Unread 03-25-2020, 05:08 PM   #9
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It's interesting because these plastic boxes with the flange for that purpose are here, but I don't think too many places require them. I'd like to see what one of these looks like, plastic with the tabs to screw to steel studs with the foam on flange. Such a thing exists?
It does. I just posted a photo of it. It’s kind of useless, though, because there is no support on the side opposite the stud and you can only fasten it on the flat side of the stud.
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Unread 03-25-2020, 05:30 PM   #10
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What you are talking about is what we generally refer to as “far-side support”.

To achieve this we would generally use the Caddy H23 bracket to hold the box. It also allows you to attach the box to either side of the stud.
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Unread 03-25-2020, 05:37 PM   #11
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What you are talking about is what we generally refer to as “far-side support”.

To achieve this we would generally use the Caddy H23 bracket to hold the box. It also allows you to attach the box to either side of the stud.
I wonder if those are CUL rated? I've never seen them before. Typically I use KSS boxes.

Those caddy supports still don't help with the vapour barrier issue though.
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Unread 03-25-2020, 05:37 PM   #12
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Originally Posted by HackWork View Post
What you are talking about is what we generally refer to as “far-side support”.

To achieve this we would generally use the Caddy H23 bracket to hold the box. It also allows you to attach the box to either side of the stud.
Isn’t that just for a 4 X 4 box?
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Unread 03-25-2020, 05:41 PM   #13
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Isn’t that just for a 4 X 4 box?
Yes, with a mud ring. Can’t you cut the vapor barrier tightly around the mud ring?
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Unread 03-25-2020, 05:42 PM   #14
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Yes, with a mud ring. Can’t you cut the vapor barrier tightly around the mud ring?
Vapour barrier has to enclose the box.
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Unread 03-25-2020, 05:42 PM   #15
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or 4 11/16 boxes. So yes there would be a problem for your barrier.
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Unread 03-25-2020, 05:56 PM   #16
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Confirmed. Flanged and gasketed in AB now.
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Unread 03-25-2020, 07:03 PM   #17
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I'm not Canadian, but I did stay in a Holiday Inn once

Can't you use 4x4 with mud rings and wrap it in duct tape? Just like you would if you were chasing masons?
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Unread 03-25-2020, 07:59 PM   #18
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I have only ever used plastic vapour barrier. Cut in 2 x 2 sections and wrap the box in it.

Cheers
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Unread 03-25-2020, 08:26 PM   #19
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I have only ever used plastic vapour barrier. Cut in 2 x 2 sections and wrap the box in it.

Cheers
John
Big enough courtesy loops there? Lol

Sent from my new phone. Autocorrect may have changed stuff.
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Unread 03-25-2020, 08:27 PM   #20
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I have only ever used plastic vapour barrier. Cut in 2 x 2 sections and wrap the box in it.

Cheers
John
I've done that on occasion when I didn't have the right poly hat, but overall poly hats are way easier.

I'm not a fan of the plastic boxes on the exterior walls that we have here.

They're more of a pain to work with, and are not as adaptable. No spacing them out or in to accommodate finished wall thickness.

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