Mark the sink height then toe screw 2 6 backers to the studs to support the sink bolts cutting out more drywall as necessary.
Attach sink to stud wall.
Optional move the stop valves closer to the trap in order to hide them behind the pedestal.
Cut a hole in the wall spanning from stud to stud and then cut a piece of 2 8 to fit snugly between the studs.
How to attach a pedestal sink to the wall without studs.
Attach the mounting bolts.
Although it isn t the preferred way of securing the sink to the wall you can use adhesive caulking as well.
You have to open the wall to expose at least two studs neither of which can be located directly behind the sink.
You have to support both ends of the blocking with a stud.
When you push the pedestal sink against the wall you can screw it to the lumber behind the drywall.
If a wall stud happens to be centered directly behind the sink you need to open the wall to three studs the one behind the sink and the studs on either side of it.
The lumber is secured to the wall studs and covered with a drywall patch.
Follow manufacturer s instructions for locating the sink brace.
For sinks that do not attach with a bracket ask an assistant to hold the sink at the wall so the upper holes at the rear underside of the sink align at the horizontal line on the wall.
More often than not a pedestal sink s mounting holes will not line up with existing wall studs.