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Chicago, IL
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Kenmore, WA
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Vinyl siding over drywall?
[#2] Posted: 11/29/2006 - 11:02:01 AM |  |  |
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Hi Kurt,
Yeah, I see it done on newer condos out here all the time.
It's usually part of a layered wall system wherein the drywall is placed behind the OSB, the whole thing is wrapped and then the siding goes on. I've never bothered to ask why. I always assumed it was some kind of firewall engineering. They typically use an exterior grade drywall, and, unless the flashings at penetrations has been done poorly, it seems to work fine. Sometimes I find it flipped the other way with the drywall on the outside of the lamina. In fact, I believe that the the building I'm living in is done exactly that way.
There are a whole lot of little 1,000 sq. ft. post WWII houses around here that were built for GI's after the war that are sheathed with an exterior-grade drywall that has a black paper facing. In most cases, it's held up for more than 50 years and still going strong. Of course, those aren't sided with vinyl though.
How many of you knew that drywall has been around for just about 105 years now?
ONE TEAM - ONE FIGHT!!!
Mike
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Chicago, IL
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 Vinyl siding over drywall?
[#3] Posted: 11/29/2006 - 11:11:00 AM | | |
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OK. Thanks. I'm not a new house guy; some of this stuff is weird.
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Kurt in Chicago
"If I smell it, it goes in the report".............Phillip Smith...2012
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Champaign, Illinois
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Vinyl siding over drywall?
[#4] Posted: 11/29/2006 - 8:10:31 PM | | |
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I've recently seen some Exterior Grade Gypsum Board that is 7/16 inch thick; I guess they are to cheap to give them a 1/2 inch of sheathing, of any kind.
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lawrenceville, georgia
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Vinyl siding over drywall?
[#5] Posted: 11/30/2006 - 01:55:07 AM | | |
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I seldom if ever see building wrap under vinyl siding in my area. I wonder if this is a local thing or is included in 2006 IRC? I have 2003 and 2000 IRC but not 2006 IRC. My area uses 2000 IRC with local up dates. I am going to research this item but someone out there may know the answer.
Thanks,
Paul B.
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Spring Hill (Nashville area), Tennessee
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Vinyl siding over drywall?
[#6] Posted: 11/30/2006 - 07:46:14 AM | | |
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The exterior drywall that I have seen is not white in color, the gypsum has a cream to tan color. Also the paper backing is tan in color and can have what looks like fiberglass threads/fibers in it.
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Scott Patterson
http://www.traceinspections.com
"Minds are like parachutes they only function when open"
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Chicago, IL
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Vinyl siding over drywall?
[#7] Posted: 11/30/2006 - 09:32:54 AM | | |
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Further research......
It's part of the FRRA. The house setback was minimal, and they got a variance based on having an adequate fire resistance rated assembly.
Thanks all. And yes, this was a strange color; kinda grey.
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Kurt in Chicago
"If I smell it, it goes in the report".............Phillip Smith...2012
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Spring Hill (Nashville area), Tennessee
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Vinyl siding over drywall?
[#8] Posted: 11/30/2006 - 11:18:51 AM | | |
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Wait till you see a home with EIFS, and exterior drywall for a substrate!
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Scott Patterson
http://www.traceinspections.com
"Minds are like parachutes they only function when open"
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Columbus, Mississippi
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Vinyl siding over drywall?
[#9] Posted: 11/30/2006 - 11:48:14 AM | | |
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"Exterior drywall"....
If that isn't an oxymoron, it should be. What a stupid, stupid, stupid idea.
Brian G.
Endlessly Amazed & Dumbfounded 
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Kenmore, WA
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Vinyl siding over drywall?
[#10] Posted: 11/30/2006 - 2:07:03 PM | | |
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I'be been seeing exterior gyp on buildings (commercial) for years. I guess its just a west coast thing.
Since I don't do commercial stuff, I really couldn't explain the benefits of using it on the exterior. But I've seen it growing up, and all around cities just driving by and taking a gander at how stuff is built.
Have never seen it yet on a residence (except for multi-family).
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Randy Navarro
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Kenmore, WA
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Vinyl siding over drywall?
[#11] Posted: 11/30/2006 - 3:10:53 PM | | |
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Hi,
This should be enlightening. click here.
OT - OF!!!
M.
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Kenmore, WA
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Vinyl siding over drywall?
[#12] Posted: 11/30/2006 - 3:31:13 PM | | |
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Hi Kurt,
Here's the stuff I've been seeing around here. Click here
ONE TEAM - ONE FIGHT!!!
Mike
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Chicago, IL
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Vinyl siding over drywall?
[#13] Posted: 11/30/2006 - 4:58:24 PM | | |
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Interesting.
I remember Fine Homebuilding ran an article many years ago about an architect in California that fought the muni's & won regarding gyp as a structural panel. Seems the critical consideration was glue; nailed panels didn't provide much (loosened up over time), but glued panels provided as much racking resistance as plywood.
I know it really stiffens up a frame when you glue 5/8" Type X to the walls & ceilings.
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Kurt in Chicago
"If I smell it, it goes in the report".............Phillip Smith...2012
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Barrington, IL
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Vinyl siding over drywall?
[#14] Posted: 12/02/2006 - 5:19:22 PM | | |
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This is new construction. Garage outside wall is built solely of wood studs, drywall and vinyl siding. No plywood, no OSB and no paper. I could't tell what the rest of the house was - for some reason they used housewrap.
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Eric Barker
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Sedalia, Missouri
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Spring Hill (Nashville area), Tennessee
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Vinyl siding over drywall?
[#16] Posted: 12/03/2006 - 08:15:50 AM | | |
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It might be required in the Code but the manufacturers that I'm aware of do not require it.
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Scott Patterson
http://www.traceinspections.com
"Minds are like parachutes they only function when open"
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Gaston, Oregon
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Sedalia, Missouri
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Vinyl siding over drywall?
[#18] Posted: 12/03/2006 - 10:58:51 AM | | |
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Jim,
I do not have the capability to scan this from home. According to the Table though water-resistive barrier is required on all siding material. There are a couple of exceptions with stipulations for the Fiber Cement Panel and lap siding. If I get the chance I will scan the table.
Thanks for the opportunity.
Craig
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Sedalia, Missouri
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Vinyl siding over drywall?
[#19] Posted: 12/03/2006 - 5:54:30 PM | | |
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Here is a list that require weather-resistant according to the table.
Horizontal aluminum w/insulation wo/insulation.
Brick veneer / Concrete masonry veneer.
note: For masonry veneer, a weather-resistive sheathing paper is not required over a sheathing that performs as a weather-resistive barrier when a 1-inch air space is provided between the veneer and the sheathing. When the 1-inch space is filled with morter, a weather-resistive sheathing paper is required over studs or sheathing.
Hardboard / Panel siding-vertical
Hardboard / Lap siding-horizontal
Steel
Stone veneer
Particleboard panels
Plywood panel / exterior grade
Vinyl siding
Wood rustic, drop / A weather resistive membrane shall be installed weatherboard fashion under the vertical siding unless the siding boards are lapped or battens are used.
Shiplap
Bevel
Butt tip
Fiber cement panel / lap siding: R703.2, Protection against condesation in the exterior wall assembly shall be provided in accordance with Chapter 11 of this code.
Craig
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Cartersville, GA
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Vinyl siding over drywall?
[#20] Posted: 12/03/2006 - 7:32:33 PM | | |
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It's a little clunky, but here's the table:
Download Attachment:  table.pdf
91.72 KB
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