| HGTV had a nice article on this. However, I have never heard of anyone laying it dry, it's always mortared to the top of the patio. Here's the link that should answer questions. http://www.hgtv.com/hgtv/gl_design_patios_decks/article/0,1785,HGTV_3568_1384273,00.html |
Here is a link that might be useful: HGTV article