How on earth do you Mitre 127mm plaster coving?

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I'm about to put a few pieces of plaster coving in my hallway.
I've just had a dry run on mitreing a corner and can't fathom it at all !!
I've got a couple of internal and external joints to do....any help very welcome please !!! :confused:
 
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You can get a tool like a half pyramid :eek: that lays across the concave part of the cove and you cut against one of the sides ;) metal ones for the pros and placcy for diy ..........probably in your local shed now.......otherwise use trigonometry :)
 
Don't know if they still do but Gyproc used to print a paper template for both internal & external mitres on the back of their sales literature. Cut out the templates, lay them on the coving, draw a line & cut with a hand saw - it worked fine for me for many years; chances are the walls will be out so your going to have to do a little filling anyway!
 
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Easiest way is to make yourself a mitre box. Fairly easy to make from a couple of pieces of 25x175 timber.
 
Thanks for your replies gents. I took Nige F's advice and bought a plastic 'pyramid' which works ok (& I mean just ok). There weren't any metal versions. Instructions are v. poor tho'.
Just one last question...how do you mitre a horizontal piece of cove to a vertical one? Is it still the same method? I just don't want to waste more cove experimenting again.
 

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