Corner Sink

It is a corner porcelain sink, and we plan on installing some 2x8 joists so that we have something to attach the sink. We will first install the plasterboard and then sink.

question, what kind of fasteners do you use against the joists? There are a variety of holes on the back of the sink, there is any point to specific stress that we want to secure? Are there any type of washers used to sit against the sink so that we do not have metal (Lag, for example) against the porcelain?

u can use the GAL, I've used 3 screws before.just in.decking make sure u never go with using a rubber washer and the drain pan washer.rubber cons