Originally Posted by Smallaxe
Dead grass thatch should stay on the lawn to decompose and provide cover for seed..
. using a slit-seeder in an attempt to get the seed under the grass mulch is good, but seed will find its way into the mulch just fine...
Living thatch on the other hand doesn't allow seed to penetrate its waterproof layer, but then it is thick with weak grass already... knowing the status of this living thatch will help you decide how to proceed with the seeding...
I can think of no circumstance where detaching will help the situation of either type of thatch... raking in the $10K every Spring is probably the only reason to keep de-thatching on the lawncare list...
I think we may not all be on the same page, as to what thatch is:.....?
And to the OP How much thatch do you have? That would give us all the ability to answer your question in our own opinions and you can decide what to do from there.