I've built several retaining walls and only one patio. We are bidding on a small raised patio for a customer and I think I already know the answer to this question but need to check to be sure. When you have completed your retaining wall and begin base for the patio, how do you deal with drainage behind the wall? We usually use perf. pipe and 1" clean aggregate along with soil sep. fabric. Do you fill with road base behind the wall and compact or still put some clean behind the wall. Our wall is only 1 foot tall and a 500 sq. ft. paver patio. Also with the soldier course on the patio I was planning on using adhesive where it joins with our wall block, any other suggestions?