This coving is all around my house, but some needs repair and I can't match it.
It's a "C" profile with a lip at the bottom. I thought perhaps the lip was a separate picture rail or something, but it is all one moulded piece (plaster).
Does this profile have a name? I am based in the UK.
Best Answer
I would call that a "cove with bead". The main part is a simple cove, and there is a bead added at the bottom for a little extra detail.
To make the repairs, you would have to duplicate it in plaster. You would cut a template, pour plaster into a trough to hold the corner shape, then use the template to shape the exposed surface of the plaster to match the existing molding. Once the plaster has hardened, you have to "glue" it to the ceiling with more plaster. You'll probably want some sort of specialist to do this for you as it's not particularly easy, especially as a first project in plaster.
As an alternative, you may be able to find a matching cove and bead in wood or polystyrene (as it seems someone has done). These would be much easier to install with simple finish nails and a bit of filler over the nail heads.
A third alternative would be to find just a matching cove, then add a matching bead. If installed carefully, nobody would ever see the joint between the two (the joint would be above the bead and you'd have to have your head where your camera was in order to see the joint, so it wouldn't even have to be super tight). Again, wood or plastic would make for an easy installation.