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Drywall archway question? Garrett?

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Drywall archway question? Garrett?

Old 04-20-2007, 04:43 PM
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Default Drywall archway question? Garrett?

I need to cut an door/archway with a curved radius. Its for a buddy and I dont want to bring in my plasterer for such a small job. It has to match several others in the house. Ive got the framing figured out- plywood sandwiched with 2x4s cut to the width of existing framing. What do you use for cornerbead that can turn a corner with? Would you do lathe/plaster for the jamb area or would you backcut blueboard?
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Old 04-20-2007, 05:29 PM
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Default Re: Drywall archway question? Garrett?

You can purchase corner bead designed for installing on a radius. For the inside of the radius, we either bend 1/2" drywall on large radius, or do 2 layers of 1/4" on tighter radius.
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Old 04-20-2007, 07:10 PM
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Default Re: Drywall archway question? Garrett?

http://www.gibraltar1.com/files/Cornerbead.jpg

It's not a very good picture of the corner bead, but you can see that the one side has cuts to allow for the radius......I'd be surprise if Home Depot doesn't sell it? I get my supplies from a wholesaler.

I agree with Paul's drywall choices, but with caution! Far to often I see fairly open radiuses (inside or out) done with ˝" board and the board doesn't flow properly.....the board ends up developing vertical cracks in the gypsum when the screws are set home. Therefore it would probably be safer for you to use two layers of 1/4" drywall.....the first layer ends up acting like a backer for the second layer.

OR

You can hang your ˝" first and then a second layer of 1/4" over top of that....it really all depends on the radius one is working with.

OR

You can take your ˝" board and hit it with the garden hose! Some inside radiuses found at the base of some circular stair cases can only be done this way.
* Soak down the inside side of the sheet and let it sit for a good half hour before trying to work with it. If after a half hour you don’t find the sheet flexible enough, give it more water and wait some more. The waiting time is for the water to penetrate the gypsum to soften it up. Carrying a full wet sheet of drywall requires atleast two people with caution, it is pretty soft. OH, be careful with your screws, they will go right through with ease! Once you’ve got your wet sheet or piece hung let it dry before installing your corner beads.

IMO the most successful way of doing radiuses is to have a backer for the drywall to conform to. That backer can either be drywall or 1/8" plywood and on the tighter radiuses wet drywall is the only way to go IMO.
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Old 04-20-2007, 07:25 PM
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Default Re: Drywall archway question? Garrett?

Oh, I should add:

Because you are doing an archway that will require corner bead, you have to under size the thickness of the arch you build so it will accommodate the 1/2" thickness of drywall that goes on it's face plus space for a layer of ˝" plywood that will need to go on both faces of the arch (under the drywall). The plywood facing provides a continuous nailing surface for your corner bead’s outside radius (all your little fingers). The inside radius isn’t a problem because the contour of the corner bead holds it tight to the drywall with just a few nails.
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Old 04-20-2007, 07:36 PM
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Default Re: Drywall archway question? Garrett?

I just did a 36" diameter full arch..it's the bead that actually makes the radius, the rock just gives you something to build to. I used 1/4" rock. Follow Garretts procedure, you'll be fine.
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Old 04-21-2007, 03:04 PM
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Default Re: Drywall archway question? Garrett?

Thanks alot guys. Its about a 3 foot diameter,and only the thickness of old 2x4 + lathe + horsehair plaster on both sides so its around 6 inches. . I think Ill only use the wetting as a last resort if I cant get the double 1/4 inch to work out without it cracking. Im going to use a couple layers of 1/8 ply as backing.
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Old 04-21-2007, 06:34 PM
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Default Re: Drywall archway question? Garrett?

The question that comes to my mind is why bother with the drywall on the inside of the arch? You are already using 1/8" ply (doorskins) there. Just put the corner bead on and mudd over the doorskins? I don't think there is anything magical about the drywall, it is just a cheap substrate.
Just my 2˘
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been doing it since 1971
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Old 04-21-2007, 06:51 PM
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Default Re: Drywall archway question? Garrett?

thom you raise an interesting point, the potential problem is your door skin won't flow the radius and therefore your corner bead's outer edge won't flow. IMO it's really a show and tell situation.

I tried to give the guy an overview of doing radiuses and let him pick and choose which one he goes with. But you are right, your method will work under the right conditions.
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Old 04-21-2007, 06:57 PM
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Default Re: Drywall archway question? Garrett?

iIf you have a place that sells trim-tex they sell a product called fast cap that is used for arches. http://www.trim-tex.com/productsindex.htm
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Old 04-22-2007, 07:58 AM
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Default Re: Drywall archway question? Garrett?

Are these beads plastic? they look so to me. Maybe Im wrong but I figured that the mud will adhere much better to drywall than to plywood. Sortof like plaster over blueboard. I see your from seattle. I have a buddy who was a taper from seattle and he had never heard of a skimcoat over blueboard with a unikal or diamond? Do they not do this out there. Its pretty much the standard here and the finish is rock hard. Once againm thanks for the help.
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Old 04-22-2007, 09:05 AM
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Default Re: Drywall archway question? Garrett?

Building trades are highly regionalized..what is common in one area my be unheard of 200 miles away. I'd avoid the wood for the expansion/contraction factor.
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Old 04-25-2007, 12:58 PM
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Default Re: Drywall archway question? Garrett?

I use a product called easy arch for my arches, they are a metal frame and always turn out nice, and I use the trim tex flexible corner bead.
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Old 04-25-2007, 06:05 PM
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Default Re: Drywall archway question? Garrett?

Knocked out the hole today, framed and plywooded no problem. Wet the back of the 1/4 drywall well and put on 2 layers. Definately the way to go. Found the plastic bead no problem. Got on the first coat of mud. Thanks for the help all.
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