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How to repair cracked cornice?

Hi, I repaired cracked cornice, now it looks worse. I cannot find that same profile size which is 65mm. So I would like to try again to repair, now I am wondering if there is a tool out there that can be used to fit that cornice curved profile if I put some sort of plaster there?

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Nailbag

Hi @margiemh

as @JacobZ mentioned we would need a few more clear photos far and close as I can't tell where the issue is.

To know if it's 55mm or 75mm cornice, just measure its height as per image below.

Nailbag

Screenshot 2024-09-01 at 3.00.54 PM.png

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JacobZ

Hi @margiemh,

Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.

Is it possible to get some closer photos of the issue you are having?

It looks like the top edge may have some slight cracking, but it's very difficult to see the issue from the photos you have provided. If this is the case, you might like to check out How to repair a cracked cornice for a step-by-step guide on how to fix this issue.

Is it also possible to get a photo with a tape measure against the cornice for scale?

I have found that cornice is very difficult to measure as the measurement refers to the radius of the cornice as opposed to the measurement across the curved section. I note that there are options for 55mm and 75mm Cove Cornice from CSR. One of these may actually be closer to the size of your cornice than you suspect. If they do turn out to be a close profile, they can be ordered through your local store's Special Orders desk.

Also, allow me to tag some of our helpful members to see if they have any advice to offer, @Dave-1, @Noyade, @Jewelleryrescue, @Nailbag.

Let me know how you go with those additional images and if you have any further questions, please don't hesitate to ask.

Jacob

Nailbag

Hi @margiemh

as @JacobZ mentioned we would need a few more clear photos far and close as I can't tell where the issue is.

To know if it's 55mm or 75mm cornice, just measure its height as per image below.

Nailbag

Screenshot 2024-09-01 at 3.00.54 PM.png

margiemh

Many thanks Nailbag, I've got it now, I did measure incorrectly, I went along the curve! So I'm all good now, I will remove that one cracked cornice and replace with a new one. I won't be sending any other photos, as I will not attempt to repair, now that I know I can replace.

Thank you once again.

Nailbag

Nice one @margiemh glad we were of help.

Nailbag

margiemh

Many thanks Jacob for your quick response.

Cheers,

Margie

margiemh

Hi, I have tried to repair cracked cornices, but they continue to flake away whilst I am placing the Parfix Multipurpose filler on the cracks. When I apply the filler, more old stuff just comes away. So I have been applying with a spatula and small roller, to smooth it over. I have done this before, and when I sanded it a few days later, it just flakes away again. Any good clues or tips please?

Jason

Hi @margiemh,

Sorry to see you are still having trouble.

As there is going to be a delay before one of our resident Bunnings D.I.Y. experts can assist, let me tag a few other helpful members for their thoughts: @homeinmelbourne, @Brad and @Nailbag.

Thanks,

Jason

Nailbag

Hi @margiemh

Without any photos to get a better idea of what's going on, I can only think that the cracked areas need to be dug out more to remove anything loose before applying the filler. But only use the Parafix to fill the deepest part of the holes/cracks to just below the surface. Allow it to dry for a few days and then use a skim coat over the top to either side of the crack. This would only then need a very light sand to finish. And make sure you're sanding away all of the old paint either side of the cracks to give skim coat more surface area to stick to.

Nailbag

margiemh

Hi Nailbag, many thanks for your response. The fact is when I touch the cornice, it just continues to flake off, I reckon if I do what you suggested, there will be no cornice left, also the ceiling is beginning to come away. It sure is a problem! Anyway, I did fill it best I could yesterday again with Parafix. I also think if I sand it carefully more flaking will appear. Do you think if I were to use "skim coat" over where I have filled that would be okay? Then I will paint it.

thanks again,

Margie

EricL

Hello @margiemh

It is a bit of worry if flakes keep coming off the cornice. Have you tried to sand the surface of the cornice until it stops flaking? the final result should be that you'll get a powdered residue instead of flakes coming off. The only reason I can think of why you are getting flakes is because the old paint coating has deteriorated badly. The other reason is that a new coat of paint was placed over an old coat that was not prepared properly.

If this happens then any sealer or coating placed over the defective coating will fall off in flakes. I propose sanding the surface of the old cornice thoroughly before you attempt to coat it with any type of paint or filler. Make sure to wipe and clean the surface of the cornice before you with Selleys Sugar Soap Wall Cleaning Wipes. I also suggest having a look at these discussions - Interior cornice is loose, how-to re-attach without removing? by @dr_harika and How to repair a cracked cornice.

If you can share a photo of the cornice, that will give our members a better idea of its current state. We can then make recommendations on how to proceed.

If you have any other questions we can help with, please let us know.

Eric

margiemh

Many thanks Eric for your response.

There is a problem with the removal of flaky bits of cornice, that is once I have sanded and then fill, well how do I get the correct profile back? I did look in Bunnings for a rounded tool, but couldn't find one.

EricL

Hello @margiemh

Can I please request for a closeup photo of the flaking surface and the part you repaired? This will give our members a better idea of what's happening. We can then make recommendations on what steps to take. Technically after you've sanded the surface of the cornice there is no need to fill it unless there are large irregularities on the surface of your cornice. The purpose of sanding the surface is to remove the flaking bits of paint and getting a nice smooth surface.

If you need further assistance, please let us know.

Eric

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