How To Trim An Arched Window

 
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Old 06-25-2010, 12:46 AM   #1
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How To Trim An Arched Window


I got a side job doing trim on a unfinished house but the trouble is that I haven't had to do an arched opening. The trim is to be MDF 2 1/4 ogee Base/Case. What would be the best way to try to bend it. Thought about relief cutting the bottom which would become the top to create a fan. Suggestions please.
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Old 06-25-2010, 02:40 AM   #2
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Re: How To Trim An Arched Window


Check trimster.com to see if they have a profile that will work for you. If you are trying to match an odd ball custom trim it can be time consuming and a royal PITA. Hopefully one of the pro trim guys may have more current info & will jump in here.

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Old 06-25-2010, 05:20 AM   #3
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Re: How To Trim An Arched Window


i wouldnt even do a trim id return the drywall right to the window and be done.
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Old 06-25-2010, 05:34 AM   #4
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Re: How To Trim An Arched Window


use flex trim. lay it out on the floor over night and let it "rest" to its arch shape
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Old 06-25-2010, 05:58 AM   #5
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Re: How To Trim An Arched Window


We always get our arched casings made by a custom millwork shop. You may be able to make your own out of sheet goods and put your own profile on it.
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Old 06-25-2010, 07:21 AM   #6
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Re: How To Trim An Arched Window


In my opinion you have two choices in order to do it right. Both were already spoken to in previous posts. Have it made to match or get flex trim.

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Old 06-25-2010, 07:28 AM   #7
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Re: How To Trim An Arched Window


just make it yourself, don't try and bend it, just get a wider piece and draw the arch then cut and router it. I've made many arch pieces. one time I had to make a large one and used two pieces of the trim specified and ripped alternating pieces (to make up for the saw cut) and glued them all back together in the arch. It was getting painted so you never saw the pieces. Had to do that twice in the same house, one bigger than the other.
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Old 06-25-2010, 09:05 AM   #8
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Re: How To Trim An Arched Window


Quote:
Originally Posted by loneframer View Post
We always get our arched casings made by a custom millwork shop. You may be able to make your own out of sheet goods and put your own profile on it.
Yea you can just give them the radius of the arch and they will make one for you.
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Old 06-25-2010, 10:20 AM   #9
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Re: How To Trim An Arched Window


It is a single point radius trim. The jamb would be simple to make. What's the profile of the molding?
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Old 06-25-2010, 11:34 AM   #10
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Re: How To Trim An Arched Window


I tried using a piece of pvc trim for a similar window a few years back. With some effort, I got it to make the curve. The first nail caused it to explode into a million pieces. Really scary.

Started over with flex trim after learning what didn't work.
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Old 06-25-2010, 02:43 PM   #11
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Re: How To Trim An Arched Window


Go to Home Chepo all thier Trim has a bend just like the Window!
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Old 06-25-2010, 03:40 PM   #12
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Re: How To Trim An Arched Window


You just need one of these



Leo has a thread on curved moldings you might want to look at http://www.contractortalk.com/f13/cu...oldings-74133/

Personally, I would not attempt it myself. I would refer them to someone who does custom millwork, you want them to have it done the right way.
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Old 06-25-2010, 04:09 PM   #13
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Re: How To Trim An Arched Window


Get a hold of the window supplier, they will hook you up!
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Old 06-25-2010, 05:26 PM   #14
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Re: How To Trim An Arched Window


Quote:
Originally Posted by dprimc View Post
I tried using a piece of pvc trim for a similar window a few years back. With some effort, I got it to make the curve. The first nail caused it to explode into a million pieces. Really scary.

Started over with flex trim after learning what didn't work.
If you're bending PVC trim, you should use a heat blanket to soften it enough to make the curve, or make it out of sheet goods, like I do.
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Old 06-25-2010, 05:34 PM   #15
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Re: How To Trim An Arched Window


Here's how I do them. Just a router and a home made base for the router. I've done wall plates with 3/4 plywood the same way. 16' radius is the largest I've done so far. Just have to extend the base using 6" wide rips of plywood.
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Old 06-25-2010, 05:40 PM   #16
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Re: How To Trim An Arched Window


What about the interior Lone?
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Old 06-25-2010, 05:49 PM   #17
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Re: How To Trim An Arched Window


Quote:
Originally Posted by KennMacMoragh View Post
What about the interior Lone?
On curved trim, we usually get it made at a custom millwork shop. Just have to give them the radii and a trim sample.

I did make a few casings in my own house, very much like the window in the opening post, but I used sanitary trim throughout.

I apologize for the quality of the pics,. I had the wrong film in the camera. These were taken the day I sold the house.
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Last edited by loneframer; 06-25-2010 at 05:56 PM.
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Old 06-26-2010, 02:33 AM   #18
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Re: How To Trim An Arched Window


I wondered why they didn't order a trim kit with the window.

It's just a single ogee I might attempt to make it. Flex trim dose sound like it would work. I'll do that window last but will have to address it first with the HO to figure out which way he wants to go. Oh and he needs to rent the scaffolding for me to put it in too. Thats not going in off a ladder thats for damn sure.
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Old 06-26-2010, 10:39 AM   #19
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Re: How To Trim An Arched Window


Here's a video of cutting radii with a router. I only used one radius on this setup because the inside curve was the only one that mattered. You can use as many center lines as you want and change bit profiles to flute the trim, etc. These were being used to make bending forms for drywall, so I whipped them out pretty quickly.

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
http://www.youtube.com/watch?v=f-uZRuz4P0I
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Old 06-26-2010, 10:43 AM   #20
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Re: How To Trim An Arched Window


Here's where the got used

I also made some ramps to bend an arch across the sheets, using a combination of the router for the radius and a Skilsaw to make the straight cut.
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