Large elliptical cove

[Bud Zeien]

Hey guys,
I have a project coming up quick in which I need to make some large cove in the shape of an ellipse. The ceiling currently has a rectangular recess in it appx. 12' wide x 20' long x 12" deep. I have to make cove molding to go in this recess that will be an ellipse, the cove molding will be appx. 10" tall and will be painted. I'm currently thinking of using some foam insulation as build up and finishing it off with some plaster. Any better ideas? We have a CNC. The piece will be made in several sections as to get it in the room. How well would plaster stick to foam?
Thanks for the input!

[Bud Zeien]

Here is a picture for clarity...

[Jerry Miner]

Before you get too far, you might consider contacting these guys. Flexible curved trim is what they do, and they claim to be able to produce "any profile":

http://www.flexibletrim.com/G_Products.htm

[Lee Schierer]

On an episode of this old house or other rennovation program they were installing foam coves in a tray ceiling that were quite large. I think they were coated with plaster. There are suppliers for this type of thing. Decorative Crown Molding

[Sandra Mart]

Before you get too far, you might consider contacting these guys. Flexible curved trim is what they do, and they claim to be able to produce "any profile":

http://www.flexibletrim.com/G_Products.htm

you right Jerry, The website provides information that is very complete..

[Mel Fulks]

I've made mouldings for similar spaces ,but in two or even three layers using a soft glued up mdf like Trupan ultra lite
I don't think one large cove is a good idea for that space. Looks too much like a substitute for a dome.