Lost me, are the walls bowed or the cieling joist. Doesn't matter. Which ever is bowed put 2x material up next to it, trueing out the bow. If it's exterior you want to true out, check with the historical committe for certificate of appropriate, they might let you use vynl
siding, if so just fur out the low areas. kind of a pain, but fan fold works wonders for this.
i had that problem with a 100 year old house that had like 5 roofs on it so the second story walls were all bowed out. well we took all the roofs off and had a skeleton 2nd floor and used comalongs and pulled them into true and then braced and readjusted the trusses to hold at the new wall positions, had to replace some boards but if i had to do the house all over again i would have bull-dozed it and started from stratch. LOL
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