Gap between wall and new ceiling

[Bathfan]

Hi after some advise, i've taken down an old lath and plaster ceiling (horrible job!) and installed new plasterboard ceiling. Have some gaps were the wall meets the ceiling, ranging from 5mm up to 15mm. I can use expanding foam on most sections but this bit has a void beyond the gap and not sure what to do.
Any suggestions on ways to fill it? Also should scrim tape be applied where wall meets ceiling? Walls will be lined with paper as in bad condition.

Many Thanks

 

[oldbutnotdead]

150mm isn't a gap, its a gaping hole! The pic shows gaps in the 5 to 15mm range- filler or spare plaster would do for them, just wodge it in.

 

[Bathfan]

150mm isn't a gap, its a gaping hole! The pic shows gaps in the 5 to 15mm range- filler or spare plaster would do for them, just wodge it in.

Ooops! Yes meant 5 to 15mm, just worried it will just fall into void as nothing holding it there. I guess scrim tape would help with this?

 

[oldbutnotdead]

Yes. 15mm is a bit much for filler if there's no wall behind but you'd get away with using plaster or board adhesive in those gaps, then tape and joint as normal

 

[johnny2007]

Or just install coving and cover any imperfection.