A contractor's advice needed

[Eli M.]

Dear BP family,

I hope all of you had wonderful holidays!!!

Now back to flipping, renting, rehabbing and improving our communities.

A quick question here. When I'm rehabbing/building a new bathroom, do I absolutely need to apply Redgard to waterproof it or the moisture resistant sheetrock is enough ( purple or green) ? Do I absolutely need both?

Thank you all in advance and have a great winter,

Eli