[Daniel6227]

can I install Durock directly to my old cement floor and how

 

[Blondesense]

Why? What are you planning to do?

This thread may answer some of your questions:

http://www.diychatroom.com/f5/tiling-basement-104871/

 

[oh'mike]

No backer board over concrete,ever.

Concrete is a good surface to tile to----is there a flaw in the existing concrete?