Scribing coving

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mr_diy

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I need to fit a piece of coving with an exteral mitre on the left side and the right-had side scribed to an already fitted piece. (if that makes sense).

I have read a thread on here about doing this with a coping-saw - but despite a few hours with a coping saw and sandpaper, I cannot for the life of me figure out what I am doing wrong. I can get a nice snug fit between the 2 pieces, but only if the new piece is about 1cm down the wall from where it is supposed to be!

What am I doing wrong?
 
I need to fit a piece of coving with an exteral mitre on the left side and the right-had side scribed to an already fitted piece. (if that makes sense).

I have read a thread on here about doing this with a coping-saw - but despite a few hours with a coping saw and sandpaper, I cannot for the life of me figure out what I am doing wrong. I can get a nice snug fit between the 2 pieces, but only if the new piece is about 1cm down the wall from where it is supposed to be!

What am I doing wrong?
Cutting it wrong!!! Simple
 
I need to fit a piece of coving with an exteral mitre on the left side and the right-had side scribed to an already fitted piece. (if that makes sense).

I have read a thread on here about doing this with a coping-saw - but despite a few hours with a coping saw and sandpaper, I cannot for the life of me figure out what I am doing wrong. I can get a nice snug fit between the 2 pieces, but only if the new piece is about 1cm down the wall from where it is supposed to be!

What am I doing wrong?

Picture would make it easier to get someone to help.
 
Is this just your standard hypocrisy coving? Pics would help. I’m imagining it to be on a chimney breast return by your description. Maybe your walls/ceiling line is way out and you need to be a bit handy with filler
 
Pics attached
 

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I should mention this is a scrap of coving I am practicing with, so the left hand joint isn’t correct.
 
Just cut the existing cove. Measure 67mm or 84mm depending on cove size along top and cut with knife down to bottom corner. Scribe never works well I have found.
 
I’m winging this answer, that’s pretty awkward. But until someone comes along with something better .....

I think I’d put the next piece on the face of that first so I’d know where it has to meet up with. I’d probably try doing a small section from the external to where it would meet the top line. I’d then possibly free hand the rest with adhesive, or casting plaster. Maybe finish it off with a bit of one-fill maybe
 
Just cut the existing cove. Measure 67mm or 84mm depending on cove size along top and cut with knife down to bottom corner. Scribe never works well I have found.

I think that would be a nighmare as I would need to keep the knife blade at 45 degress all the way through the cut?
 
I think that would be a nighmare as I would need to keep the knife blade at 45 degress all the way through the cut?
No. As near as you can. Seal the dry edges with Pva or some kind of sealer. Pack the joint with filler so it oozes out. Let it set a little and shape up. Let it dry and sand. Tad more filler if needed. The new angle will act as a guide. Done loads myself
 
Just cut back the the existing coving fit a new piece with an internal left hand mitre then cut another piece with a right internal with a left hand external and carry on from there. Do you have a mitre box?
 
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I put pencil line down free hand and go easy with Stanley knife to cut through. Wood Chisel to remove lumps off filler
 
Ok, great - thanks guys - I think I have a way forward!
Frist I will try wayners suggestion of cutting a RH internal mitre into the piece which is already in situ.

If that goes pear-shaped then I just make a straight cut about a metre away and replace with a new length which I will cut a RH internal mitre into.
 
You will be fine. Just keep bottom level and don't worry about the top edge. You can hide the top when filled but the bottom being level is critical
 
Just a quick note, if the existing is British Gypsum and the new stuff Knauf then they are different, they are the same size but the profile is different. It may be my eyes but your existing bit of cove looks like it is sitting to far down the wall to me.
 
I think they are both British gypsum - I was left with some fragments when I demolished the cupboard and it had be same label on the back as the new stuff.
 
So I had a go at this last night and although it’s far from perfect it might be close enough to fill?
(There is no adhesive on yet, this was just me holding it up).
 

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Seal and pack full with filler. Sealer will stop the shrinking and it will never crack. Will be perfect when done. Good job there
 
Does the existing coving come down the wall more than 83mm?
Hmm - I will check tonight, but if it does and I just make the new pieces at the same level will that work?

When I looked at the picture it did look like the coving was quite far down the wall, but when you look at in the room then it's not obvious, so might just have been the angle I was holding the camera at - I will check tonight.
 
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