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outlet boxes in basements with furring strips #67078 06/25/06 08:06 PM
Joined: Aug 2004
Posts: 69
nov Offline OP
How do you fellas go about installing outlets in a basement wall. The set up is furring strips nailed to the cinder block then paneling or sheetrock installed. There is only a 3/4" space between the rock and block. I have seen those arlington boxes that go into the void in cinder block but I am worried about a hole that large in the block because of water. The sheetrock is not bad it would be an 1 1/4" box but the paneling is only 1/8" thick.

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Re: outlet boxes in basements with furring strips #67079 06/25/06 08:31 PM
Joined: Jul 2004
Posts: 9,558
gfretwell Online Content
Cutting into the block with a side grinder is the easiest way. You can also fish that wire through the block into a deep box and avoid that "physical damage" problem. Water shouldn't be an issue since block is not waterproof but thermal insulation/draft stopping may be an issue. The mounting pad usually has a 1/2" offset but if you shim it to the block with 3/8 ply instead of nailing to the furring it works out right for 1/8 panelling.

Greg Fretwell
Re: outlet boxes in basements with furring strips #67080 06/26/06 12:22 PM
Joined: Dec 2005
Posts: 44
TNSunny Offline
I generally just run conduit down the wall and mount the boxes on the surface. It really doesn't look all that bad, and sure beats the heck out of trying to cut cinder block 3/4"-1" behind the surface of the wall and through an opening the size of a single-gang box. And once you factor in the time it takes to fish wire through the block - IF the block isnt' filled with concrete - installing the conduit is much more cost effective.


Re: outlet boxes in basements with furring strips #67081 06/26/06 01:52 PM
Joined: Aug 2005
Posts: 214
Elviscat Offline
You might be able to install shallow Wiremold boxes, I believe they're 15/16" so you might be able to have them install the paneling over the boxes with only a slight bulge... Just a suggestion

Re: outlet boxes in basements with furring strips #67082 06/26/06 02:01 PM
Joined: Jan 2003
Posts: 4,391
iwire Offline
We usually blow out the block with a demo hammer making room for a 4" sq box and plaster ring.

I don't think wire mold boxes are listed for flush installation.

Bob Badger
Construction & Maintenance Electrician
Re: outlet boxes in basements with furring strips #67083 06/26/06 03:06 PM
Joined: May 2002
Posts: 1,716
Roger Offline
We do the same as Bob does and if the blocks are hollow we just use a hammer.

We use one of the boxes below or one simlar.

[Linked Image from]

[Linked Image from]

If the furring strip doesn't work out with a web we just add a short piece where we want it.


Re: outlet boxes in basements with furring strips #67084 06/26/06 08:30 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
My first suggestion is to lay the panelling over a layer of sheetrock. The panelling, in my experience, simply is not stiff enough to support itself- unless you're putting the firring 6" apart! Nobody likes the wavy look of unsupported panelling.
(If you plan on a layer of foam insulation, the sheetrock is a MUST for fire protection. Foam burns like rocket fuel).

It is possible to use MC- it's skinnnier than pipe- but you still will have the connector running into the sheetrock, and some trimming will be needed. And then there is the issue of "mud ring" sizes.

Sure there are real shallow "cut in" boxes out there, but they will neither solve the connector problem, nor have room for more than three wires.

Wood isn't that pricey .... why not use thicker firring? A 2x2 will give you an entire 1 1/2" to work with.


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