DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Walls and Ceilings > Bent drywall




Reply
 
Thread Tools Search this Thread Display Modes
Old 04-12-2010, 01:25 PM  
SJNServices
Senior Member
 
SJNServices's Avatar
 
Join Date: Dec 2009
Posts: 124
Liked 2 Times on 2 Posts

Default Bent drywall

Whats the best way to drywall the inside of an arched doorway or radius?



__________________

[url=http://www.SteveJNichols.com]My Website - SteveJNichols.com[/url]
[url=http://bent-nail.blogspot.com]My Blog - Sticks & Stones[/url]

SJNServices is offline  
 
Reply With Quote Quick reply to this message
Old 04-12-2010, 04:53 PM  
Wuzzat?
Banned
 
Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

Default

http://www.google.com/search?client=safari&rls=en&q=%22arched+doorway%22+drywall&ie=UTF-8&oe=UTF-8



__________________
Wuzzat? is offline  
 
Reply With Quote Quick reply to this message
Old 04-12-2010, 06:39 PM  
Nestor_Kelebay
Emperor Penguin
 
Nestor_Kelebay's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 1,844
Liked 2 Times on 2 Posts

Default

I would use two layers of 1/4 inch drywall.

They make the stuff in 1/4 inch thickness specifically for applications where it needs to be bent. I'd check with your local drywall distributor to see if they stock 1/4 inch, and if it'll bend into the radius you need.

__________________

Last edited by Nestor_Kelebay; 04-12-2010 at 06:44 PM.
Nestor_Kelebay is offline  
 
Reply With Quote Quick reply to this message
Old 04-12-2010, 07:30 PM  
Wuzzat?
Banned
 
Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

Default

Quote:
Originally Posted by Nestor_Kelebay View Post
if they stock 1/4 inch, and if it'll bend into the radius you need.
"1/4-inch drywall board for a 5-foot radius"
__________________
Wuzzat? is offline  
 
Reply With Quote Quick reply to this message
Old 04-12-2010, 08:30 PM  
Nestor_Kelebay
Emperor Penguin
 
Nestor_Kelebay's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 1,844
Liked 2 Times on 2 Posts

Default

Well, the websites that Wazzat's link bring up suggest wetting 1/2 inch drywall to soften the paper so that it can be bent into a smaller radius. I expect if you wet 1/4 inch drywall with a spray bottle before bending it, you could probably bend it into a pretzel.

The other option would be to dispense with the drywall completely and use expanded metal and base coat plaster for the arch.

Use plywood cut across the grain to accomodate any difference in thickness between the material used on the arch way and that used on the straight sides of the doorway.

__________________

Last edited by Nestor_Kelebay; 04-12-2010 at 08:33 PM.
Nestor_Kelebay is offline  
 
Reply With Quote Quick reply to this message
Old 04-12-2010, 09:17 PM  
SJNServices
Senior Member
 
SJNServices's Avatar
 
Join Date: Dec 2009
Posts: 124
Liked 2 Times on 2 Posts

Default

And I thought 1/4" would snap when you bent it! Thats what I get for thinking again. My wife warned me about that.
Thanx!!

__________________

[url=http://www.SteveJNichols.com]My Website - SteveJNichols.com[/url]
[url=http://bent-nail.blogspot.com]My Blog - Sticks & Stones[/url]

SJNServices is offline  
 
Reply With Quote Quick reply to this message
Old 04-13-2010, 05:53 PM  
Nestor_Kelebay
Emperor Penguin
 
Nestor_Kelebay's Avatar
 
Join Date: Mar 2009
Location: Winnipeg, Manitoba
Posts: 1,844
Liked 2 Times on 2 Posts

Default

I graduated from mechanical engineering, and even though I really don't use any of the equations and stuff anymore, it's surprising how often the basics show up in everyday life, like drywall.

Your presumption that thin drywall would break when bent doesn't fly from an engineering point of view because paper is actually quite strong in tension. Try rolling a piece of paper up into a tight roll and pulling it apart and you'll discover how strong it is in tension.

It's exactly that property of paper that makes drywall rigid. You see, for drywall to bend, then the paper on one side or the other has to stretch to accomodate that change in shape. The thinner the drywall, the less the paper has to stretch to accomodate the same change in shape, so thinner drywall bends easier than thicker drywall.

It's the same thing with steel rebar in concrete. When concrete is properly reinforced with steel re-bar, the rebar is typically placed on both sides of the concrete, just under it's surface. The purpose in doing that is to keep the concrete rigid. With steel rebar inside the concrete on both sides, then the steel rebar on one side or the other of the concrete slab has to stretch before the concrete slab will bend.

Lots of times you'll see a single layer of steel rebar in the middle of the thin concrete slab, like a floor or sidewalk, for example. In that case, the purpose of the rebar is not to reinforce the concrete to make it stronger and more resistant to bending; it's only to hold it together in one piece. That single layer of steel rebar would not strengthen the concrete at all, it would only help hold it together in one piece if and when it breaks. If instead you put a layer of rebar like that on both sides of the slab, then the slab is very much more difficult to break because it has to bend before it breaks, and the steel rebar on one side or the other has to stretch before the slab bends. The result is a slab of concrete that is very much more difficult to bend, and therefore seems to be "stronger", even though the concrete itself isn't any stronger.

__________________

Last edited by Nestor_Kelebay; 04-13-2010 at 05:57 PM.
Nestor_Kelebay is offline  
 
Reply With Quote Quick reply to this message
Old 09-16-2010, 12:01 PM  
taperguy71
Junior Member
 
Join Date: Sep 2010
Location: hudson, wisconsin
Posts: 12
Default

Hello, The best way depending on how extreme the arc is: For tighter radius two layers of wetted 1/4'' for more gradual wetted 1/2'' . If you set up a saw horse and lean the rock against it the sheetrock will start to relax. Hope this helps. Good luck!



__________________
taperguy71 is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Drywall next to the tub prefoet Walls and Ceilings 3 01-18-2010 06:27 PM
Bent Shower Frame donkeydoo General Home Improvement Discussion 1 03-12-2009 02:40 PM
Drywall mud stlcar2nz Walls and Ceilings 3 07-16-2007 07:25 AM
Drywall Help Drywallhelper Walls and Ceilings 4 08-10-2006 07:15 PM
Bent Metal Chain Link Fence Posts rnolte General Home Improvement Discussion 1 08-04-2006 09:11 PM

Newest Threads

LATEST SPONSOR DEALS