electrical boxes and layerin drywall

Hi all... This may very well be a stupid question but here goes anyway... I am looking at doing a wall using RC1 and 2 layers of 5/8" sheetrock. When I measure for the outlet boxes, that I have from another remodel, I find that to get the box out to the correct position at the last drywall sheet, the box is at the very edge of the 2x4 stud. Are there special "deep" electrical outlet boxes for this type of wall assembly? Can you find them at Home depot, etc? Also anyone find any advantage in using 1/2" and 5/8" instead of two 5/8"? Ie; dis-similiar materials. I have read the Recommended book and he seems says he does not know. thanks...jam

The consensus around here is that it makes more sense to use all of the thicker material, rather than trying to mix-and-match different thicknesses. In theory there are slight benefits to using varying thicknesses, but those benefits are generally outweighed by the benefits of having the extra mass of the thicker material throughout. Plus, it's easier to keep track of a single stack of a single thickness, vs. multiple stacks of varying thicknesses. Less waste too. My walls will be so thick that I plan to do surface-mounted steel boxes. I'm not 100% sure about this code-wise, but I think you can mount your boxes as though they'd be flush with a single layer of drywall, and then you can use this type of extender to accommodate the extra depth. --Keith :mrgreen:

jamminji wrote:

Also anyone find any advantage in using 1/2" and 5/8" instead of two 5/8"? Ie; dis-similiar materials. I have read the Recommended book and he seems says he does not know.

Jam, do you mean my book? I didn't suggest that I didn't know - I said it was nonesense to spend your money on that type of construction - why throw it away on anything that was not tested and true? That's a long way frm my seeming to say I didn't know......... BTW - my answer is still the same - use 5/8" drywall - it the cheapst mass you can buy - Rod

Oh geez... that did sound bad! No Rod... I did not mean it to sound like you do not know what your talking about. Excatly what siad in your post. There is no data on it and without data it is anyones guess, and best to do what is proven. Sorry for the terrible writing... please forgive me! jam Great book btw...

I found electrical boxes at home depot that adjust via a screw to varying depths. they have a metal bracket that you screw to the stud and then a screw moves the box in or out. You can adjust them pretty far out. I plan on 2 layers of 5/8 drywall and there is plenty of adjustment for them.

You can see pictures of them in my studio post for barn door studios http://www.johnlsayers.com/phpBB2/viewtopic.php?t=8740