Deep, wide plaster crack and backer board
I couldn't figure why I had a recurring crack in from mid-wall up through actual lathe and mesh crown molding in a 1960s house. V cutting the crack I started to peel away what was a previous repair (bad- using only drywall compound and fiberglass tape for a big gap). Scraping further I discovered the crack forms where a doorway previously was. In the late 80s the door was moved and they used backer board to cover the space and then thin coated plaster over the backer board. The cracks are occurring where the backer and original plater meet (different rates of seasonal movement.) The wire mesh is gone from the back of the large cracks. Now that I have cleaned out the crack of all old material, it's massive. (pictures) Im thinking I can treat the cracks and backer board with plaster weld and then push durabond 45 deep into the cracks to fill and then paper tape. Is this the best plan for addressing these cracks?
