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Sheetrock On The *exterior* Of A House?

 
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Old 04-09-2014, 01:41 AM   #21
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Re: Sheetrock On The *exterior* Of A House?


Quote:
Originally Posted by smalpierre
The other guy mentioned plywood corners. Durrr!!! I've seen that done before with blackboard between without being nailed off to where it's structural. I've seen racking braces, but usually 1x and in old houses - inset into the studs. What I HAVEN'T seen is these t straps fitted in to a saw kerf nailed to studs. What's that look like and how does it work?
My best way to describe it would be. It looks like the t's from drop ceiling. You snap a line at a 45 and cut the studs so it can slip in. Then pop an 8d nail in through the top of the t into the studs
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Old 04-09-2014, 01:54 AM   #22
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Re: Sheetrock On The *exterior* Of A House?


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Originally Posted by jlsconstruction View Post
My best way to describe it would be. It looks like the t's from drop ceiling. You snap a line at a 45 and cut the studs so it can slip in. Then pop an 8d nail in through the top of the t into the studs
link or pic? I think I've got the idea but I could be way off.

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Old 04-09-2014, 02:05 AM   #23
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Re: Sheetrock On The *exterior* Of A House?


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Old 04-09-2014, 05:15 AM   #24
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Re: Sheetrock On The *exterior* Of A House?


We used to use a ton of it along the shore. It has a good flame spread rating. The buildings we used it on were 4' off the property line. http://www.ebuild.com/product-detail...ior/223132.hwx
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Old 04-09-2014, 05:34 AM   #25
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Re: Sheetrock On The *exterior* Of A House?


Quote:
Originally Posted by rosethornva
I'm an old house gal, and know precious little about 1980s/90s construction. I'm helping a friend with a problem she's having at her 30-year-old house in California. They've found excessive wood rot due to moisture, and she's telling me that her house has sheetrock used as an exterior sheathing (in place of plywood/osb) on her California tract house. Has anyone heard of this before? And any ideas when this practice was in vogue? It's on a not-so-nice two-story tract house in a San Francisco suburb. Thanks for any insight.
A lot of it in South Jersey. 2x8 sheets wrapped in black paper. We call it Gyplap. Don't know if that's the proper term. I've seen people install foam panels over top of it and then install the vinyl siding. I guess that's ok since there are houses that are foam right on the studs then sided over around here. If you remove all the exterior to install plywood then plan on installing new insulation too. I've done it before on a few houses and we always reinsulated. Good luck!
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Old 04-09-2014, 06:41 AM   #26
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Re: Sheetrock On The *exterior* Of A House?


I used it here in IL once on a commercial building built 1' from the property line for fire rating.Code called for 2 layers of 5/8 on the exterior and 1 layer of 5/8 on the interior for a 2 hour fire rating.The wall was 64' X10'H and turned into a $5000 wall for materials.This was around 15-20 years ago.
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Old 04-09-2014, 02:16 PM   #27
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Re: Sheetrock On The *exterior* Of A House?


Thanks for the many replies and good responses.

I learned something about new construction today!!!

And frankly, I'm not too dazzled! LOL. I can't imagine putting this exterior gypsum on a house in lieu of sheathing.

Yikes!

Thanks again.
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Old 04-09-2014, 03:16 PM   #28
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Re: Sheetrock On The *exterior* Of A House?


Rose, while this is not perfectly normal sheathing, it is definitely a common sheathing out west on buildings like multi unit apartments. We called it gyp board. At the time, they said it was a requirement for the prevention of spreading fires.

It looks like from the pictures that it's not the gyp board that is the issue, but rather the leaking from the siding. Protected from the elements, this product is no worse than anything else that is put up. I've put up tons of it.
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Old 04-09-2014, 10:21 PM   #29
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Re: Sheetrock On The *exterior* Of A House?


Used 5/8 green board for fire rated sheeting on these semi attached homes today. It's used for code here and sometimes over 1/2'' ply . If not sided soon it will begin to break down . Great when used in a flood or coastal area .

These homes replaced homes damaged or destroyed by Sandy on Staten Island . They are on raised foundations as per new flood elevation maps . Neighbor hood very slowly coming back .
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Old 04-10-2014, 11:10 AM   #30
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Re: Sheetrock On The *exterior* Of A House?


Yup, seen it before on a 1961 house in Santa Cruz. Did a stucco patch and was surprised to see it used as sheathing. Effing sucked trying to get the stucco off without destroying the gypsum sheathing behind it.
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Old 04-10-2014, 07:25 PM   #31
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Re: Sheetrock On The *exterior* Of A House?


I've only seen gypsum board used as sheathing in the Bay Area a few times, under stucco, in some less fancy suburban homes from the 60s or 70s. I've never seen it in the City. DensGlass, which is a bit of a different animal, does get used, particularly when fire rating counts, in multi-family projects.

Never in shear walls. Now, many urban and suburban lots in densely packed suburbs are narrow, with few window and door penetrations in the long, side walls. Those long, side walls are sometimes strong enough without being engineered shear walls, or so has been explained to me, and that's where you'd see it, both gyp board and DensGlass these days. That's where I've seen it, now that I think of it.

I'll ask the next S.E. I talk to.
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Old 04-10-2014, 11:34 PM   #32
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Re: Sheetrock On The *exterior* Of A House?


What do you know, I have a set of plans on my desk right now, for an addition, that specify gypsum board under stucco. Tomorrow I'll ask the engineer why.
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Old 04-11-2014, 09:55 PM   #33
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Re: Sheetrock On The *exterior* Of A House?


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Originally Posted by CarpenterSFO View Post
What do you know, I have a set of plans on my desk right now, for an addition, that specify gypsum board under stucco. Tomorrow I'll ask the engineer why.
I asked, and the engineer's response was that the wall needs sheathing, primarily as backer for the stucco, and the wall doesn't require the strength of plywood, and gypsum is cheaper than ply. I can use ply if I want, at about $25/sheet, or gypsum sheathing, at $14/sheet. I'm not sure where score and snap and screw compare in cost to skilsaw and gun nailing.

It was probably mentioned by another post, but gypsum sheathing is very similar to but is not the same as standard gypsum wallboard, which is for interior use only.

One on-line reference mentioned that gypsum sheathing can be used in Type 1 and Type 2 construction, where plywood can't be used.

Rose, I'm glad you started the thread. It's been educational for me.
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Old 04-12-2014, 06:05 AM   #34
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Re: Sheetrock On The *exterior* Of A House?


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Originally Posted by CarpenterSFO View Post

Rose, I'm glad you started the thread. It's been educational for me.
Thanks!

Heaven knows I've certainly learned a *lot* in the last couple days about contemporary construction techniques!

BTW, this house I posted about is in a San Francisco suburb, and I see you're in that area. I wonder if exterior gypsum board is more prevalent in that area?

Here in Norfolk, I've never ever never heard of exterior gypsum being used on a house.
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Old 04-12-2014, 07:02 AM   #35
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Re: Sheetrock On The *exterior* Of A House?


Quote:
Originally Posted by smalpierre View Post
The other guy mentioned plywood corners. Durrr!!! I've seen that done before with blackboard between without being nailed off to where it's structural. I've seen racking braces, but usually 1x and in old houses - inset into the studs.

What I HAVEN'T seen is these t straps fitted in to a saw kerf nailed to studs. What's that look like and how does it work?
Simpson Strong Tie:

http://www.strongtie.com/news/indust...entional.html#

http://johnotvos.wordpress.com/2010/...wall-erecting/

Good stuff.
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Old 04-12-2014, 11:16 AM   #36
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Re: Sheetrock On The *exterior* Of A House?


Quote:
Originally Posted by rosethornva View Post
Thanks!

Heaven knows I've certainly learned a *lot* in the last couple days about contemporary construction techniques!

BTW, this house I posted about is in a San Francisco suburb, and I see you're in that area. I wonder if exterior gypsum board is more prevalent in that area?

Here in Norfolk, I've never ever never heard of exterior gypsum being used on a house.
I don't really know if it's more prevalent; I work primarily in the City, where I've never seen it. I can say that right now, many of the commuting homes built within 75 miles of SF in the 80s, 90s, and early 00s seem to be falling apart, sinking, racking, cracking, peeling, leaking, collapsing, etc.
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Old 04-13-2014, 05:13 AM   #37
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Re: Sheetrock On The *exterior* Of A House?


Quote:
Originally Posted by smalpierre View Post

The other guy mentioned plywood corners. Durrr!!! I've seen that done before with blackboard between without being nailed off to where it's structural. I've seen racking braces, but usually 1x and in old houses - inset into the studs.

What I HAVEN'T seen is these t straps fitted in to a saw kerf nailed to studs. What's that look like and how does it work?
We've used T braces in the past, as well as coiled strap by Simpson. The coiled straps were installed in an X configuration, wherever we could fit them on a wall. The T straps couldn't be overlapped due to design, so we alternated direction so that a minimum of one would be in tension while another was in compression. We always installed as many as would fit in the wall, which was typically 52 - 56 feet long, depending on the lot size.
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Old 04-13-2014, 07:08 AM   #38
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Re: Sheetrock On The *exterior* Of A House?


They have it on this older apartment complex in my area built in the 60's. They have had a lot of fires over there too.
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Old 04-13-2014, 09:43 AM   #39
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Re: Sheetrock On The *exterior* Of A House?


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Originally Posted by smalpierre View Post
How does that work? Wouldn't think it'd give any support to keep the wall from going out of square - diagonal support, isn't that one of the jobs of wall sheathing? Even blackboard is structural if you nail it enough.

Let in bracing should be used.


In the 90's installed a lot of that ext type x on condo/apts buildings while framing. Would use it in combination with osb.
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Old 04-13-2014, 05:43 PM   #40
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Re: Sheetrock On The *exterior* Of A House?


one i've run into recently..notice the fancy wiring
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