When installing a cultured marble shower in a new house do I need to spread thinset on the floor for the base if it sits level on it's own or can I use something else to fix it in place. I plan to use Hardy Backer cement board on the walls , what is the best adhevise to use to install the cultured marble walls to the cement board?

First: are you installing Cultured marble on the floor ?

Hello - did you ever receive an answer to your question? I have the same question about a cultured marble shower pan and walls but we are installing on a cement floor. Put down level quick last night but the floor is still not entirely level. There were no instructions to this unit.

Perhaps this will help, Install a Solid-Surface Shower Pan | Extreme How To, DIY - Do it Yourself, Home Improvement, Home Decorating
Good luck, Tom

Thanks but that site gives mostly definitions and does not give installation instructions

Sorry! Try this one. How to Install a Cultured Marble Shower Surround | eHow.com
Let me known if that works for you, Good luck, Tom