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tigereye 08-21-2009 10:14 AM

Mounting a panel to a concrete wall
I know this is probably a dumb question, but I'm getting ready to put up a sub panel in my basement. I know I need to mount the panel to plywood. So, planned on using a 4x4 piece of 3/4 Exterior grade. Question is, do I mount the plywood directly to the wall or do I mount PT 2x4s to the wall and the plywood to that? Wasn't sure if I needed an airgap/vapor barrier/insulation behind the plywood since it's below grade.

Also, what's the recommended method for mounting to the wall? Tapcons or something similar? Any way to do it without a hammer drill?



Termite 08-21-2009 11:09 AM

Some people mount them on plywood. Leave the sheet larger so there's room to attach a GFCI receptacle box, phone stuff, and alarm panels if they're in the same area. The ideal installation involves keeping the plywood from directly contacting the concrete due to moisture. You can mount some strips of 1x treated material to the wall and mount the plywood to that. Or for a cleaner look you can use some roofing felt between the plywood and the foundation wall. Trim it once the plywood's installed. I'd avoid treated plywood because of its corrosive nature to metals.

As for anchors, a hammer drill is pretty important. You could use ramset nails if you have access to a ramset gun but occasionally they'll blow out the concrete. Tapcons are a good way to go in my opinion, and they're easy to install.

J. V. 08-21-2009 11:38 AM

Why drill extra holes. Mount the panel directly to the wall. Get the blue screws or nail drivers. Panels are designed to have a little space behind them when surface mounting.

220/221 08-21-2009 02:54 PM


Why drill extra holes. Mount the panel directly to the wall.
I always mount directly to the wall.

1/4" plastic anchors for small panels, 3/8" sleeve anchors for bigger stuff.

micromind 08-21-2009 07:11 PM

If it's my choice, I'll mount a panel directly to a concrete or block wall. As stated above most, if not all, panels have dimples in the back of the can to provide a bit of space from the wall. Only 1/8" or so, but it keeps the moisture out.

If the back of the panel was flat, I'd definitely use plywood. Or 1X2s.

I usually use Tapcons. Quick and easy.


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