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I'm a bit puzzled about what's behind the drywall in my high rise condo built 3 years back. When drilling into an interior room wall supposedly where a stud should be(found by a stud detector and yes I am using it properly), my drill goes through the wall with barely any resistance.

It's a fairly lengthy wall, about 10 feet connecting my living room to my bedroom. However, when I drill into the wall connecting to the neighbours, I feel a lot of resistance and definitely hitting a stud.

Could it simply be that the studs are paper thin and weren't meant to handle extra load besides the wall?

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1 Answer 1

Even though you found the stud with your stud finder, you may have missed it. Even steel studs will offer a bit of resistance to drilling, and you should see some metal filings or twists following the bit out of the wall. You may have to try again with a very small bit 3/4 inch one way or the other to find the stud. Use your stud finder to give yourself a better idea what side of the original hole you should try. Of course, you can use the hole you already drilled by inserting a drywall anchor rated for the load you want to attach. I prefer the corkscrew type anchors to the expansion type.

There is a difference between the interior private walls and the common wall in condos. Common walls are always thicker, usually thicker sheetrock or two layers of 1/2 inch rock. This is for a longer fire time rating and soundproofing between units.

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Thanks! You were right, I was off by a bit and just missed the stud. –  user2308797 Feb 16 at 22:17
    
Just an additional question, what's the typical load capable on a metal stud assuming I'm using a toggle bolt? For example, if I want to hang a mirror or tv that's 30lbs, do I need add plywood to the back? Or can I get away with toggle bolts on two studs? –  user2308797 Feb 16 at 22:24
    
the studs can handle a 30 pound load (15# per stud) very easily. No problem. Be sure to select the proper anchor for the load. There should be a load rating on the anchor packaging. –  shirlock homes Feb 17 at 11:44

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