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Subject Author Date
Wall design and vapor barriers Vlab20 04-28-2006
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Posted by Vlab20 on April 28, 2006, 2:21 pm
We are designing a commercial building in northern California, 100
miles Northwest of San Francisco. The general contractor (from
Wisconsin), who is our client in this case wants to use an EIFS system
on the exterior. We have alot of information that the builders in CA do
not want to touch EIFS and we are thus recommending using portland
cement stucco.
This is where the questions come:
We are looking to design the wall with approximately 7/8" two coat
stucco system on metal lath, over 30 # building paper, on 5/8" Dens
Glas on 6 inch steel studs, with 6 inch fiberglass batt insulation and
5/8 inch Type X gysum wall board with permeable latex paint.
I have been to Buildingscience.com but find that there is not a black
and white answer to the wall design.
Vapor Barrier needed? Vapor barrier on exterior of Dens Glass?
Has anyone done any buildings in this Mixed Climate region or a Hot Dry
Climate?
I welcome any thoughts of details you have done on your projects. Thank
you.


Posted by 3D Peruna on April 28, 2006, 2:34 pm
Vlab20 wrote:
> We are designing a commercial building in northern California, 100
> miles Northwest of San Francisco. The general contractor (from
> Wisconsin), who is our client in this case wants to use an EIFS system
> on the exterior. We have alot of information that the builders in CA do
> not want to touch EIFS and we are thus recommending using portland
> cement stucco.
> This is where the questions come:
> We are looking to design the wall with approximately 7/8" two coat
> stucco system on metal lath, over 30 # building paper, on 5/8" Dens
> Glas on 6 inch steel studs, with 6 inch fiberglass batt insulation and
> 5/8 inch Type X gysum wall board with permeable latex paint.
> I have been to Buildingscience.com but find that there is not a black
> and white answer to the wall design.
> Vapor Barrier needed? Vapor barrier on exterior of Dens Glass?
> Has anyone done any buildings in this Mixed Climate region or a Hot Dry
> Climate?
> I welcome any thoughts of details you have done on your projects. Thank
> you.
>
>

You posted to alt.building.construction, too. Go to
http://www.buildingscience.com. All of the information you seek can be
found there or through resources available there.


Posted by on April 28, 2006, 5:54 pm

Vlab20 wrote:
> We are designing a commercial building in northern California, 100
> miles Northwest of San Francisco. The general contractor (from
> Wisconsin), who is our client in this case wants to use an EIFS system
> on the exterior. We have alot of information that the builders in CA do
> not want to touch EIFS and we are thus recommending using portland
> cement stucco.
> This is where the questions come:
> We are looking to design the wall with approximately 7/8" two coat
> stucco

Traditional stucco on lathe usually requires three coats. Refer to
your building code and ASTM C 926.

> system on metal lath, over 30 # building paper, on 5/8" Dens
> Glas on 6 inch steel studs, with 6 inch fiberglass batt insulation and
> 5/8 inch Type X gysum wall board with permeable latex paint.
> I have been to Buildingscience.com but find that there is not a black
> and white answer to the wall design.
> Vapor Barrier needed?

Depends on what you're trying to accomplish.

> Vapor barrier on exterior of Dens Glass?

Is that the hot humid side in Northern CA?

> Has anyone done any buildings in this Mixed Climate region or a Hot Dry
> Climate?
> I welcome any thoughts of details you have done on your projects. Thank
> you.


Posted by inspector.terry@gmail.com on April 30, 2006, 11:22 am
I do not know if the I-Codes are applicable, as only a few California
jurisdictions are adopting a portion of the codes. So for what it may
be worth, here is the IBC reference that may help.

2512.1 General. Plastering with cement plaster shall not be
less than three coats where applied over metal lath or wire fabric
lath and not less than two coats where applied over masonry,
concrete or gypsum board backing as specified in Section
2510.5. If the plaster surface is to be completely covered by veneer
or other facing material, or is completely concealed by anotherwall,
plaster application need be only two coats, provided
the total thickness is as set forth in ASTM C 926.

2510.5 Backing. Backing or a lath shall provide sufficient rigidity
to permit plaster applications.
2510.5.1 Support of lath. Where lath on vertical surfaces
extends between rafters or other similar projecting members,
solid backing shall be installed to provide support for
lath and attachments.
2510.5.2 Use of gypsum backing board.
2510.5.2.1 Use of gypsum board as a backing board.
Gypsum lath or gypsum wallboard shall not be used as a
backing for cement plaster.
Exception: Gypsum lath or gypsumwallboard is permitted,
with a weather-resistant barrier, as a backing
for self-furred metal lath or self-furred wire fabric lath
and cement plaster where either of the following conditions
occur:
1. On horizontal supports of ceilings or roof soffits.
2. On interior walls.
2510.5.2.2 Use of gypsum sheathing backing. Gypsum
sheathing is permitted as a backing for metal or wire fabric
lath and cement plaster on walls. A weather-resistant
barrier shall be provided in accordance with Section
2510.6.

Terry
Combination Building Inspector
ICC Certified
Utah Licensed


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