Hello,
renovating a house built in 1923. There is a masonry chimney that hasn't been used for a few years with (I think) 4 flues. In the attic, the plaster has fallen off and the bricks are exposed. If you poke at the mortar between the bricks, it's fairly easy to scrape away sand, but the structural integrity seems good. What should one do? Must it be dismantled and rebuilt or can new plaster be applied in the attic?
See pictures.
Thanks in advance!