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How to make cornice corner joints with a raked wall?

Hi, I’m about to install 75mm Gyprock Cove Cornice. I will have to make quite a few internal and a couple of external corners.I have sloping ceilings,ie raked walls. All the ceilings have a 4 degree slope.
Any ideas as to how to make good joints would be very welcome. Do I have to make up some jig with a mitre slot for my saw or is there an easier way? It’s been a long Christmas break and my head is hurting thinking about it. I do like challenges 😊.

Many thanks

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Comments

Jewelleryrescue

Hi @ironbark

I feel your pain I hope I can help.

All the corners still 45 degrees cut as per normal. The top edge of the cornace edge length might need chamfering at 4% to match roof angle.

Why cant you simply fill any gap or lip at the top join? I know you must have your reasons not seeing you problem first hand I know you will forgive me.

ironbark

https://www.workshop.bunnings.com.au/discussion/comment/33358#Comment_33358

Thank you for that. I think I’m going to cut off a couple of short lengths and play around. I do have a very large number of corners and so need to work out a quick repeatable cut; I don’t want to be fluffing around filling each joint. I was toying with the idea of making up a jig/mitre board with a build in 4degree slope so I’m able to cut both ends of the sloped edge. I haven’t got my head around it yet still plastering at the moment!

cheers Jan 😊

Jewelleryrescue

https://www.workshop.bunnings.com.au/discussion/comment/79014#Comment_79014

Hi @ironbark

can you take a picture of the profile (the end of a cornace piece) So I can try understand better thanks Not giving up on you yet 🙂

ironbark

https://www.workshop.bunnings.com.au/discussion/comment/103798#Comment_103798

Hi Jewelleryrescue,

Thank you for your maintained interest 😊🙏.

It is a very uncomplicated cornice as you’ll see. It’s basically semi circular with a very small flattened section on the back; this flattened bit obviously isn’t really relevant. Hopefully when it comes to the practice my concerns will feel misplaced! Thank you again.

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/118951#Comment_118951

Hi @ironbark,

I don't believe the 4-degree slope of the roof will necessarily change the angle of the mitre substantially. I'm a very visual person and would cut two pieces at the standard angle and place them against the ceiling. If they don't mate up correctly, make small adjustments to each to get everything lined up perfectly. Take those pieces and use them as a template to make your jig. Replicate the cut on the other pieces with the jig.

Even without the slope of the roof, filling the joint between the cornices is typical for a perfect fitment. Walls are not 100% square to each other, so some amount of filling is always required.

Please let me know if you have questions.

Mitchell

ironbark

https://www.workshop.bunnings.com.au/discussion/comment/127993#Comment_127993

Thank you Jewelleryrescue & Mitchell,

I’m thinking it’ll work out OK 😊. Always looking ahead at jobs yet to be tackled in case I need to resolve any issues. I agree now, I think my concerns were unwarranted!

Thank you both for your contributions.

Jan 😊

ironbark

https://www.workshop.bunnings.com.au/discussion/comment/103798#Comment_103798

Hi Jewelleryrescue,

The above project with the cornice and the raked ceiling had to be postponed but was tackled yesterday and today. You were correct in your first response; my initial concerns (over thinking it 😁) were unfounded and the reality was that with a little tinkering with the coving adhesive those gaps created by the four degree raking were easily resolved!

I’ve done plenty of DIY and landscaping in the past and have always just resolved issues in a practical sense when they popped up! Now much older, I’m tending to overthink issues 😆.

Thanks again for your interest.

Jewelleryrescue

https://www.workshop.bunnings.com.au/discussion/comment/119204#Comment_119204

Your welcome @ironbark

You have done well overcoming another little DIY glitch we all face.

Now your older and wiser 🙂 thinking is what will help you grow faster. It will save you time, money and help you not make mistakes to often this knowledge will aid you in further projects/ Your thinking will over come glitches speed up as your experiance builds on top of each project. Next time you are faced with similar issue you will have it nailed 🙂

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