I will be getting a price together for a friend of mine for a 20 x 20 patio with a fire pit in the middle. I am trying to talk him out of the "four cobble patio stone" that he likes from lowes and go with techo or Ep. If he does want to go with it, how much does each piece of stone cover? Its 16" by 16". Im just so used to measuring out the job and ordering pavers by the pallets. As far as the fire pit, its circle and 18 linear feet around. Is there certain block I need to use?(flame retartent, flame resistant?) I didnt know if you could just use just any block. What is the easiest block to use since it will be a circle? Id rather avoid having all kinds of cuts. Any preferences on Fire pit material? thanks!