Coving / cornice repair

[JDR]

Firstly - my first post on here, but been a visiter to the forum for a while - what a great resource it is - general thanks to all for guidance and advice picked up along the way while reading other threads.

Some adivce is wanted on repairing a section of coving on the outer corner of the chimney breast - damaged due to the previous occupier routing a gas pipe up through it - as you do to original 1920's coving.

The damaged section is only 20 - 30cm but around the corner - can anyone suggest a way of making a mould of a"good" section to be able to patch in. I have looked for an off-the-shelf section to match in and can't find one.

It is a relatively simple ridged design, 170mm x 70mm depth max dimensions.

If this makes sense I was thinking of cutting a series of profiles from hardboard or similar to make a guide for the mould - then making the mould from plaster or even papier mache - let this set then form a box around it and then make make the coving itself - using plaster or preferably something lighter - any suggestions? The idea would be to make a couple of straight sections then mitre to form the corner.

Any help greatly appreciated.
Thanks

ps - What is the difference between cornice and coving?

 

[confidentincompetent]

Small bits like that I would knock up some one coat plaster, apply roughly oversize, wait an hour or so till it starts to set then carefully hand sculpt with scraper, putty knife, trowl and a strait edge to blend with old lines etc... The plaster should work easily if you keep wetting it. I use polyfilla to finish of any bits I'm not happy with and, to get a real smooth finish to blend.. Tedious but there you are ...
Cove is just the normal curve... cornice is the fancy stuff... I think...lol..
Good luck...