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I am trying to mount a TV onto an "exterior" wall. I used the quotes because I guess technically it may not be exterior (I live in a townhouse with dividing walls between the houses).

Anyway, I've done this before at a different location with no problems. However, I am drilling guide holes and cannot seem to drill into the wall more than 1.5" (not sure the width of the sheetrock in that). I've tried drilling into multiple studs at multiple heights and get the same issue.

I do not want to saw the drywall just to look at the stud. Does anyone have any guesses as to what might be going on?

Additional info:

  • House was built in the 70s

  • Tip of drill bit is much hotter than I'd expect.

  • Didn't have this issue with the stud in-between the two studs in question.

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Are you allowed to drill into party walls? That said, my guess is you may have masonry firewalls between each unit. –  DA01 Sep 20 '13 at 21:27
    
This is not a condo. I am drilling into a stud that is on my side of the firewall and is mine to do what I will with. –  TheCatWhisperer Sep 20 '13 at 21:28
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I don't know where you live, but note that it may not actually be 'yours to do what you will with'. If it's a party wall, then it's technically jointly owned by you and the person on the other side. Local regulations or HOA regulations may have restrictions on what you can do with them. That said, if it's truly 'your side' then my guess stands...you may have a masonry wall in the middle and the stud you are drilling into is merely a furring strip (rather than a full thickness stud) –  DA01 Sep 20 '13 at 21:33
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FWIW, patching sheetrock isn't that hard. It might just be easiest to cut a small hole and peek in. If you make the hole behind where the TV will be placed, you won't even have to worry about patching it all that neatly. –  DA01 Sep 20 '13 at 21:38
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I'd consider that more of a furring strip. Hard to say, but it may not be load bearing at all...merely there to hold up the sheetrock. That doesn't explain the outlet boxes...how are those 3" deep? I wonder if your masonry wall is uneven...perhaps there's a bump out of the masonry wall? –  DA01 Sep 21 '13 at 0:14
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