I've been doing a lot of reading concerning setting the shower pan in mortar for support and leveling. From what I've read, it seems most recommend a 4:1 or 5:1 ratio of sand:cement. I'm going to use Quikcrete Sand/Topping mix which I understand is approximately 3:1. Should I plan on adding sand to bring this to a 4:1 or 5:1 ratio, or can I use it straight from the bag?

This is the shower pan we are installing: http://mobilehomepartsstore.com/Merc...egory_Code=SPN. This is in an 18-year-old mobile home and will replace an existing bathtub. It is 54" x 28", so will one 60# bag of the Quikcrete be enough? We are going to use the "pile method" I've read about on this forum. My husband is a pretty big guy so I want this to be solid and sturdy.

Thanks for your recommendations.
Joyce