Hello. I am pouring a 18" stamped border around a patio. Most of it is covered and protected from the rain. The width of it is mostly 10' with a section that extends approximately 10X15', My question is the border completely forms around the middle patio section; therefore, sort "enclosing" this middle section which I believe will not allow for expansion. 1) Should I put expansion joint material along the inside of this border before I pour the middle section. 2) Do I still use the 1/4" drop per foot guideline. I understand about sawing or troweling control joints when the concrete is wet, but I am not sure with this one.