it'll probably do the job, but as for how long it'll be before it starts moving again is anyones guess.
won't need much to do the job.
if you must use no more nails, wedge some bits of old brick or tiles round it to make it solid before hand. this should mean that the solilds are doing the job of holding the joist and the adhesive is just holding the solids in place.
Is the bay window the same do you think? Plaster and lathe? If it is thats next to be sorted.
Also how much would it roughly be to skim two 12x12" rooms and one 9x6". Had some quotes but not sure what going rate is. Both large rooms have chimney breasts and bay windows, so a few edges.
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