This is a 2 pronged question.
I currently have a plain concrete slab porch in the front of the house. I am planning to put slate (size 16”x16”) on top that will have natural earth tones. I already have a supplier ready to go. Concerning installation….should I use “thinset” with mortar or should I install exterior grade plywood over the concrete slab and then put the slate on top? Or maybe people on this board will have a better suggestion. Here are a few pics of my outdoor porch....and it will be power washed and scraped clean before any installation. http://tinyurl.com/npmr8
The second part of this question is that I am planning to buy enough slate to put a 14’x14’ slate patio in the back. Can this just be installed on tampered substrate?
Thanks for any suggestions or thoughts. As a FYI I am located in SE PA.