We had to replace some old lath/plaster walls with new sheetrock. We left the coved portion of the plastered ceiling in place, but where the sheetrock meets the coved ceiling there is a 1" - 2" gap (we left the lath in place in this gap). We have read that using a fiberglass product for these gaps is not recommended (cracks can easily develop). Paper tape is not wide enough. How do we properly repair these gaps?
Disclaimer: We aren't professionals...but want to do a good job.