Has this ever happened to you?
You have the perfect 'heavy' mirror that you want to hang directly above your sofa, but you just can't seem to find a stud in the correct location to use to support the weight of your mirror.
Note: In most homes, studs are placed 16 inches apart, but occasionally, you will find them spaced 24 inches apart.
If the mirror is really heavy... you definitely need to use a vertical stud to anchor it securely because if you attach it just to the drywall, over time the weight of the mirror will rip right through the drywall and the mirror will come crashing down one night. So... What do you do? Hang it off center, move the sofa? Not any more...
To securely hang a heavy item on the wall, use a French Cleat.
You can create a French Cleat by cutting a 45 degree angle lengthwise into a simple piece of wood.
Metal French Cleats are also available at your local hardware store.
Using this method will remove any worries of that mirror (or headboard, art, mantle, etc) crashing down off the wall one night... It will also save you the headache of major drywall repairs!