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billyg 09-21-2011 10:16 AM

Drywall arch
I would like to build an 8 feet span arch in a master bath. I'll attach 2 x4 studs on the side walls to support the top plate (2x4) on the ends. The top plate will span about 8 feet across. The problem is the joists supporting the drywall ceiling run in the same direction as the top plate.--As a result, there is no solid wood above the drywall ceiling where I can screw/nail the top plate to. I was thinking of using hollow wall toggle bolt anchors to secure the top plate to the ceiling. What's your opinion? How close should I space the toggle bolts? Will the ceiling drywall alone be strong enough to support the arch?
After the top plate is attached, I would attach 1/2 inch OSB and then 1/4 inch drywall to finish off the arch.
Any and all opinions would be welcome!

TrapperL 09-21-2011 10:53 AM

Block between the existing ceiling joists and nail the top plate to those.
Around here, the guys will drywall the the walls but the actual arch is made from 1/8" tempered hardboard. They tape and float it, texture it and paint it. Looks like it works since this has pretty much been the standard for several decades.

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