Posted: 15/07/2016 at 14:21
HI Laura, I can't open your attachments, but it doesn't really matter. You'll need to break the hardcore up before putting your soil on top. Unfortunately, drainage is important for grass to do well, so even if you're in a fairly dry area, excess rain will just 'sit' on top of the hardcore, making the soil boggy, which in turn will make the grass unhappy. It'll be worse during winter.
A good bit of digging with a fork to loosen it all might be enough, but if it's been a driveway, it'll be very compacted, so you may need to do a lot more than that to make it a viable base.
I think it may need something heavier duty than a fork!
Ooh - Bob's put the pic on