Slice Seeding is the process we use to either repair a damaged lawn or improve a thin or weak lawn:

This will increase turf density and improve the overall health and appearance of your lawn.  Slice seeding puts the seed directly in contact with the soil as opposed to merely spreading seeds onto your lawn.  This also allows for new seed to enter the soil without stripping any existing sod.  It is in our opinion the best way to renew or thin a heavily thatched lawn and sow in new and improved seed varieties.  A strong, dense lawn is the best natural defense against weed and insect damage.