prep for sod
The main thing with either sod or seeding is the soil prep. The worst thing for either is compacted soil which may be significant in the area under the concrete. If you have lots of clay or lots of sand you should add a good amount of quality topsoil and/or compost and till it in to loosen the soil 6-12". Sodding on compacted, poor soil is not going to be successful. Hope that helps.
The main thing with either sod or seeding is the soil prep. The worst thing for either is compacted soil which may be significant in the area under the concrete. If you have lots of clay or lots of sand you should add a good amount of quality topsoil and/or compost and till it in to loosen the soil 6-12". Sodding on compacted, poor soil is not going to be successful. Hope that helps.