Another photo showing ledge below is 50mm and gap at bottom of wall is 10mm 

Thanks Jacob. Yes that’s correct the plaster doesn’t line up with the ledge/beam below. The gaps vary but are around 10mm in size. Cheers

  Is there a temporary solution to fill or reduce gaps between decking that are too far apart. We plan to redo the deck at some stage but the wonderi ...

Throughout this house there is a gap between two sections of the internal walls. It’s big enough to let light (and sound) through and is where two par ...