I use the weedblock material and dump soil on top when building raised beds
for myself and my customers. It works beautifully. The grass decomposes
and I've never had a reoccurrence of grass coming up. I own a flower
planting service in Raleigh, NC and this area has very hard orange clay, so
digging is not always the easiest approach.

Penny
Zone 7b - North Carolina
Peter wrote in message ...
Just finished a retaining wall and will be putting about 12 - 14 " of
soil on top of an area 10' x 20'. currently filled with grass.

Question ??? Can I just put weed block down and dump 14" of
soil on top of the existing grass. Will this kill the grass
completely. Or should I use Round-Up or a herbicide first to kill
the grass.

I'd like to finish the job quickly, and hate to wait for the round-up
to work... if the grass dies under the load of soil that's good
enough for me.

Your advice???