I went on an appointment today for a 1000 sqft limestone (Fon Du Lac) flagstone patio. It was dry laid by the previous HO and the joints were mortared in and are now cracking/crumbling out. It has some low spots and the stone on average is 18"x18" with tight joints (1" on average). I want to hear how you guy's would fix this patio and an estimated labor time. I'm planning on rejointing with polysand.