Kyle Boatright said:

I would say you need to have the existing lawn tilled, then add topsoil and
till again before installing new sod.

Why till? That's one of the worst things you can do to the soil, and you
wanna do it twice.


Otherwise, you run a real risk of creating soil layers which will impede
root growth.

Agreed the old turf has to be removed first, but not at the cost of the
soil's structure. Renting a sod cutter rather than a tiller is a much
better option, imo.

--
Eggs

-Middle age is when broadness of the mind and narrowness of the waist
change places.