Laying A New Lawn On An Old Lawn.

I am laying a new lawn on an old one, do I need to kill the old grass first?
Yes, you do need to kill the old grass first.The best way to do this is to apply round up weed killer about 10 days before,this will kill all the grasses and weeds, making the preparation a lot easier as the soil will break up into small particles creating a better tilth or seed bed.
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