Creating a New Lawn Over Type 1

I wouldn't try growing over type 1, isn't that the red stuff that sets hard like concrete? I think it would make an impenetrable layer stopping grass roots and cause problems with drainage.

How come there is no access if it was a driveway? It would be better to use a mini digger to rip it up but might be possible by hand, once you get going with a pick it will break up, what size driveway is it? If it's not too deep you might be able to break it up and mix it up with fresh topsoil.

 

That's what I thought, so the compressed stones along with the fines make an impenetrable layer, great for a driveway but bad for a lawn. I've used Type 3 (no fines) on my driveway to allow it to be permeable and have a 4 or 5" layer of topsoil, I have Thyme on mine but grass would do just as well. I think you need to find a way of breaking up the Type 1 you have.

I seem to recall grass roots down to 6" but depends on varieties, I think the deeper you can give it the better.