Making a Ceiling Medallion
Jan. 10th, 2017 05:10 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
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The Art Deco chandelier came with the house when I bought it, but I added the plaster medallion when I put new drywall on the ceiling about 24 years ago. The medallion is gold-leafed and glazed, a typical way of decorating them in the 19th century.
Fortunately, I still have the rubber molds that I made many years ago for one of my customers. I retrieved the molds from a box in the basement, bought a 25 pound bag of plaster of Paris (way too much), a can of cooking spray, and made some space on the kitchen table.
2.

I lightly spray PAM cooking spray on the mold as a release agent. Using a rubber mold, I don't absolutely need the PAM, but it makes the casting easier to remove and causes less wear and tear on the rubber mold.
3.

The mold is in 2 parts: top and bottom. The top piece has 3 holes in it for pouring in the liquid plaster, and to allow air inside the mold to escape.
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I mixed up some plaster, 2 parts plaster to 1+ part water, in a bowl, and poured it into the mold using a plastic funnel.
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Once the mold is filled and plaster starts coming out of the air vent holes, I tap the mold gently to get any air bubbles out and then let it harden for about half an hour.
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After the plaster has hardened, I carefully remove the top half of the rubber mold. The plaster has hardened in the 3 holes, called sprues, and will have to be trimmed off later.
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Next, I remove the plaster casting from the bottom half of the mold and clean the mold off to make another casting. I will need a total of 8 castings of this leaf to make the medallion.
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The left leaf is just as it looks after coming out of the mold. The right leaf has been trimmed up with an Exacto Knife (above). The sprues have to be trimmed off as well as the line where the top and bottom halves of the mold meet. I also clean up any other imperfections.
9.

All 8 cast leaves, plus a center piece, assembled on a piece of brown paper.
I gave Pat instructions on how to lay out and attach the parts to his ceiling. If he doesn't feel sure about how to do it I may drive down to Flushing to install it for them once the weather improves. Alida and Pat were very excited that I was able to get the medallion made for them as a Christmas present. It feels good to give something that you know is wanted.
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Date: 2017-01-10 10:22 pm (UTC)no subject
Date: 2017-01-10 11:34 pm (UTC)Making the plaster castings is enjoyable, but a little messy. I'm glad you enjoyed my post!
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Date: 2017-01-10 10:29 pm (UTC)no subject
Date: 2017-01-11 05:10 am (UTC)I think I have made about 6 medallions of this design over the years, and another 8 or 10 of other designs.
The ornamental plasterwork in classic theaters blows me away! Having done repair work on the Landmark Theater here in Syracuse, and the Stanley Theater in Utica, I am very familiar with some of the spectacular plasterwork. Some of the molds they used must have been enormous! ...and I believe they used molds made of plaster, not rubber, which would have been far more difficult to work with. I wish I could have gotten you into the Landmark Theater when you were here. You would have loved the place!
Lily and I miss you! *Hug*
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Date: 2017-01-11 12:08 am (UTC)I love working with plaster. It's so versatile!
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Date: 2017-01-11 05:54 am (UTC)I was a restoration contractor for many years. About 35 years ago an Architect/friend came to me with a box full of broken pieces of a plaster ceiling medallion. The medallion had been on the hallway ceiling in an 1870 house in my neighborhood. The house had a bad fire and the plaster ceiling got saturated with water and came crashing down. Only one of the 8 plaster leaves had survived intact. Only part of the center piece of the medallion was there, but there was enough for me to identify it as the same element that had been used in a medallion I had already made for another customer. I made a temporary mold using an inexpensive product called 'mix-a-mold', and made enough castings, plus one to recreate the damaged medallion. Later on I used the extra leaf to make a new, relatively permanent mold out of plaster. I liked the flowing, rich design of this medallion a lot, it was nicer than many I had seen so I made one for my own house and several for other customers. Eventually, after about 20 castings, that mold cracked, and I bought a two-part rubber mold mix to make the current mold. The mix was quite expensive, and I don't think that company is still in business. Making the molds is a LOT of work and much more challenging than making castings from a mold.
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Date: 2017-01-11 12:49 am (UTC)no subject
Date: 2017-01-11 06:03 am (UTC)no subject
Date: 2017-01-11 01:04 am (UTC)I know the medallion you made for them will be beautiful when completed!
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Date: 2017-01-11 06:05 am (UTC)I hope that Pat can complete it, so that I don't have to make another trip to Flushing.
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Date: 2017-01-11 06:11 am (UTC)Fascinating. Beautiful too. We call them ceiling roses - and we need one for our living room. Just sayin'! ;o)
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Date: 2017-01-12 04:09 am (UTC)http://www.wheatleyplasterwork.co.uk/ornamental-plaster-products/ceiling-centres
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Date: 2017-01-11 03:16 pm (UTC)Too bad something like that would be so out of place in our house. lol...
Hugs, Jon
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Date: 2017-01-12 03:56 am (UTC)Ceiling medallions look best on a relatively high ceiling. Of course they can be made in a wide variety of styles, but should compliment the architecture of the house or the furnishings.
I know little of what your house looks like inside or out*, but the bottom line is we all make our living spaces into something that works for us and pleases us. :-)
*Hugs*
*all I remember is photos of newly refinished oak floors and some handsome draperies.
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Date: 2017-01-12 06:31 am (UTC)no subject
Date: 2017-01-12 03:11 am (UTC)Does your local library have a 3D printer? That might be a way to make lighter-weight ones.
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Date: 2017-01-12 03:37 am (UTC)I don't know if the library has a 3D printer, but that is an intriguing idea! I will have to ask.
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Date: 2017-01-13 04:15 pm (UTC)So much nicer than the popcorn ceilings I'm stuck with. :)
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Date: 2017-01-14 10:01 am (UTC)I suppose that I am a part of the history of a lot of houses around here.
A century from now I wonder if people will be saying: "He's so lucky, his house has the original popcorn ceilings from 1975."
LOL & *shudders*
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Date: 2017-01-17 03:46 am (UTC)no subject
Date: 2017-01-17 06:32 am (UTC)It is nice to see you here again! :-)
Wow
Date: 2017-03-12 09:24 pm (UTC)Re: Wow
Date: 2017-03-13 01:37 pm (UTC):-)