Creating a New Lawn

Hi all,
I have a question. I recently moved house and the rear yard was completely covered in patio brickes which were badly neglected so I lifted all 3500 Bricks.
What i am left with is Black plastic with 1 - 2 Inces of stones the 2 - 3 inces of sand. My question: If I simply Puncture the plastic in separate Places to allow the water to soak away and then put a Stone trench against the path running to a drain would this be enough or should the plastic be lifted. I am planning on putting down at least 3 -4 inces of top soil on top of the sand then buying lawn rolls to lay on the Soil.
As this is my first attemp at gardening any help would be appriciated. Thanks all.
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The plastic is there to prevent weeds from sprouting under the bricks. If you lift it up or puncture it, weeds will grow. Of course weeds will grow anyway. Depending on the kind of grass you grow and the length of its root you may be ok to just leave it alone.

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For good results, a lawn needs more than 3-4 inchs of top soil. I'd get an absolute minimum of 6, preferably 9 down. If you're going to do this, it's easier and cheaper to do it right the first time.
As long as the water is draining through the plastic that is below the stone base that is there now, it should be ok to put the top soil over the stone/plastic. Check it after a heavy rain and see how quickly it drains.
Of course, to add a decent amount of top soil, you need to have the flexibility in the grading to do this. Make sure you grade it away from the house. Depending on constraints, you may have to remove material that is already there before you can put top soil down.
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Just another thought, it was unclear if the plastic is now on top of the remaining stone base. If it is, then I would definitely remove it, as it's real easy. If it's underneath, then I would consider leaving it, as long as water is draining ok.
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Chet Hayes wrote:

Thanks All,
The stone Is on top of the plastic which would make it very difficult to lift, so I think I will get a good 6 Inces of top soil on top of the sand and make sure the water has plenty of drainage.
Again Thanks for all your input.
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