I'm also a fan of what HTURKAK proposed. Bear in mind that the kicker joint should be high enough so as not to allow the waterstop to contact the reinforcing steel below it. A good rule of thumb is that the distance from the waterstop to the rebar is 1.5 times the size of the largest aggregate...
The waterstop does not need to be installed at the center of the joint. It is perfectly acceptable to install the waterstop off-center. What you want to bear in mind, is the waterstop should have one half waterstop width in concrete cover. Example: A typical 6-inch waterstop would require 3...