So I'm trying to lay a patio with 2'x2' outdoor tiles and grass in between them. I figure if I don't take the time and do it properly it will just start to sink and look like crap in a couple years. So I was going to dig the topsoil out (about 6 inches) and lay a nice class 5 or ideally a recycled asphalt pad to act as a base. Now my question is will sod grow down into this. I figure I'll have to water the hell out of it for several months, but will it eventually root through the base? If not what is my best option to putting this together?