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Planting A New Lawn Over The Old Lawn

TBLC

LawnSite Member
I have a client that wants me to redo his front yard. Its not big at all. Less that 1,000 sq feet. The yard is a little low and he want me to bring it level with the walkway and the driveway. Which means adding about 4 or 5 inches of top soil at the lowest spot. Now, the grass that is planted there now isn't to bad, not very many weeds at all.

My question is, Do i need to spray round-up on the existing grass and then rototill it in and then add my top soil? or can I just put the new topsoil over the existing lawn and compact, seed, fert, and call it a day?

I'm from Pennsylvania.
Also, When is it to late to start to try growing new grass.




P.S.
As I keep reading this I'm thinking rototilling is the way to go.
I already check with old threads and could not find any like this?
Thanks TBLC
 
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