[1655graff]

Looks like everyone's afraid to tell you that this is a recipe for disaster. It is. Slate - unless it's a certain kind and quality - doesn't fare well outdoors. Where are you located?

"East Bay" hills of the San Francisco Bay Area.

 

[1655graff]

So CC and Bud,

I did take a look at your posts along this lines after CC's initial reply (2007, 2006, etc.). 2 questions follow:
a) Bud, you'd recommended Mapei kerabond with keralastic. In your reply to my situation here are you still good with these 2 products?
b) in one reply, someone recommended an "isolating membrane" is that backerboard and/or Ditra?

CC, additionally, I think you (and Bud) raise a good point when you ask me/others how long do we want it to last. Right now, I'd say "Long enuf that I don't feel like I wasted my time doing it." Yes, not a very good answer, I know, but 5 years would be nice. And, once it's been there for that long, of course I'd like another 5 years, etc. etc. etc.

Finally, if I was doing it from scratch, I'd DEFinitely install like Daniel.