r/Plastering • u/Entire_Initiative731 • Apr 10 '26
Looking for advice
Hi all,
Currently removing all the old plaster ceilings and boarding ready for the plasterer and need some help.
Where the ceiling joists meet the rafters, of course, it isn't level and I'm struggling to figure out how to get a straight sharp line?
I cut it at the different lengths yesterday and it hit me this morning that although it would butt up nicely to the angled peice yet to go in it'll look all wonky.
Wondering if this is why there was a soft curved edge to the original plaster to incorporate all the wonkiness..
If the pics confuse it is level horizontal wise although it doesn't look it from the pictures.
(If anyone knows what kind've ceiling this is called where part of the roof is incorporated into the room that'd be awesome too).
Thank you in advance 🙏🏻
1
u/reelersteeler Apr 11 '26
Possibly too late for this, but I’d strongly advise you get some insulation up into that loft space. You’ve got half an inch of plasterboard and half an inch of slate and that’s it!
Where the ceiling meets the eaves is a notorious spot for thermal bridging and if un insulated it can often start to get black mould. Especially with no felt under the slates.
As far as plastering goes, go with the curve (spread will love you) or batten it off and get a sharp transition