What Size Gravel Behind Retaining Wall? CR4 Discussion ...
Dec 14, 2010· Re: What Size Gravel Behind Retaining Wall? 10/30/2010 3:08 PM Mirra grid every 3 courses,3/4 stone 2'' from the back of the wall,perferated 4'''' sock pipe with 4" out lets in the bottom face of the is a calc for this for how high you go versus how far back you go with the mirra grid,ect.