Cast Iron Tub, Mortar bedding required?

[RSweet]

I'm in the process of replacing a steel tub (16 years old) with a cast iron tub. Tub will be setting on concrete slab. Should I still bed the replacement tub in mortar?

 

[Cacher_Chick]

A true cast iron tub is as solid as you can get. There would be no benefit to using a mortar bed.

 

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[RSweet]

Thank You for the sanity check!