There are a dozen ways to do this incorrectly and a few to do it right.
Welding "L" brackets and bolting them to the studs will give you the support you need. You would incorporate the slab with the sink and bolt it to the metal.
The number of brackets and their size would be determined by the size of the vanity top and the potential projected downward force.
Welding "L" brackets and bolting them to the studs will give you the support you need. You would incorporate the slab with the sink and bolt it to the metal.
The number of brackets and their size would be determined by the size of the vanity top and the potential projected downward force.