DuPont HDXXTYVK3 Installationsanleitung PDF herunterladen (Seite 10)

DuPont

™

Tyvek

Water-Resistive and Air Barriers Installation Guidelines

Facade Considerations

Water-resistive barrier performance is dependent upon the ability of the facade to drain. The

following must be considered for speciﬁc facades.

Stucco

When stucco is installed over wood-based sheathing, the 2009 International Building Code (Section 2510.6) and the 2009

International Residential Code (Section R703.6.3) require “a water-resistive vapor-permeable barrier with a performance

at least equivalent to two layers of Grade D paper” or a layer of water-resistive barrier (WRB) which is separated from the

stucco by an “intervening layer”. When DuPont

™

Tyvek

water-resistive barriers are used behind stucco they should be

separated from the stucco by a second layer of DuPont

™

Tyvek

WRB, a layer of Grade D building paper, felt, rigid foam

board or the paper backing of paper-backed lath. The ﬁrst layer (directly over sheathing or studs) serves as the wall

system’s water-resistive barrier and is integrated with window and door ﬂashings, the weep screed at the bottom of the

wall and any through-wall ﬂashings or expansion joints. Lath shall be installed over the intervening layer in accordance

with ASTM C1063-03 Standard Speciﬁcation for Installation of Lathing and Furring to Receive Interior and Exterior

Portland Cement-Based Plaster and applicable codes. Rigid foam board, when installed over DuPont

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Tyvek

WRB as an

intervening layer, will provide enhanced structural support to the DuPont

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Tyvek

layer WRB and may reduce the required

number of fasteners used for the attachment of the DuPont

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Tyvek

WRB if installed as soon as practically possible.

Brick

The 2009 International Residential Code (Section R703.7.4.2) requires a nominal 1 inch airspace separating the brick from

the water-resistive barrier (WRB). The Brick Industry Association recommends a 1 inch air-space in front of wood stud

construction and a 2 inch air-space in front of steel stud construction. Consistent with these requirements and

recommendations, DuPont

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Tyvek

WRBs shall be separated from the brick veneer by a nominal 1 inch air-space. Window

and door ﬂashing, and through-wall ﬂashing shall be integrated with the DuPont

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Tyvek

WRB layer ensuring proper

shingling. For maximum moisture management and drying of the wall system the airspace in front of the DuPont

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Tyvek

WRB shall be vented to the exterior at the top and bottom of the wall. Some types of brick ties will act as additional

fasteners for DuPont

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Tyvek

WRBs, and, if installed as soon as practically possible after the DuPont

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Tyvek

WRB, may

reduce the required number of fasteners used for the initial attachment of the DuPont

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Tyvek

WRB. DuPont

™

StuccoWrap

, DrainWrap

or CommercialWrap

D are recommended for this application and meet drainage

requirements for one coat stucco and EIFS systems.

Stone Veneer

The 2009 International Building Code (Section 1405.7) requires two layers of water-resistive barrier (WRB) behind stone

(natural, manufactured, synthetic) veneers over wood frame construction. When DuPont

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Tyvek

WRBs are used behind

stone veneer, they should be separated from the stone and mortar by a second layer of DuPont

™

Tyvek

WRB, a layer of

grade D building paper, felt, rigid foam board or the paper backing of paper-backed lath. The ﬁrst layer (directly over

sheathing or studs) serves as the wall system’s water-resistive barrier and shall be integrated with window and door

ﬂashings, the weep screed at the bottom of the wall and any through-wall ﬂashings or expansion joints. When rigid foam

board is used as the second layer, it is installed in front of the DuPont

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Tyvek

WRB. DuPont

™

StuccoWrap

, DrainWrap

or CommercialWrap

D is recommended for this application.

Wood Siding

DuPont

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Tyvek

water-resistive barriers (WRB) and wood siding shall be installed according to manufacturer’s

instructions, industry standards and applicable codes. As recommended by the Western Red Cedar Lumber Association

and U. S. Forest Product Laboratory, wood siding should be primed on all six sides before installation. Foam sheathing

panels often have low vapor permeability, and therefore can cause moisture to accumulate on the back of siding and

cause staining, buckling and damage to ﬁnish coats. As a result, the Western Red Cedar Lumber Association and other

wood siding manufacturers recommend that furring strips are used to create an air space between foam sheathing and

siding. Other recommendations that should be followed to minimize potential problems are:

• Usethickersidingpatternsinwidthsof8inchesorless.Thick,narrowsidingismorestablethanthinner,wider

patterns and better able to resist dimensional changes.

• Usekiln-driedsidingoverrigidfoamsheathing.

• Properpre-nishingisessential.

• Uselightcolornishcoatstomaximizeheatreectionandreducedimensionalmovement.

• Inallcasesitisrecommendedthathousewrap,suchasDuPont

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Tyvek

DrainWrap

, be applied over the foam

sheathing.

In high exposure installations, enhanced drainage and water management may be provided by using DuPont

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Tyvek

DrainWrap

™

, by installing a drainage mesh over the water-resistive barrier, or by creating rainscreen cladding with a

larger airspace behind the siding using furring strips. If furring is installed over the DuPont™ Tyvek

WRB to create a

rainscreen,theprimaryfastenerspacingcanexceed18”.

Fiber Cement Siding

DuPont

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Tyvek

WRBs and ﬁber cement siding shall be installed according to manufacturer’s instructions and industry

standards. In high exposure installations, enhanced drainage and water management may be provided by using DuPont

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Tyvek

DrainWrap™, by installing a drainage mesh over the water-resistive barrier, or by creating rainscreen cladding

with a larger airspace behind the siding using furring strips. If furring is installed over the DuPont™ Tyvek

water-resistive

barriertocreatearainscreen,theprimaryfastenerspacingcanexceed18”.Inhighwindareasatgableendwalls,FEMA

recommends ﬁber cement siding be installed over wood sheathing rather than over plastic foam sheathing. DuPont

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Tyvek

WRBs and ﬁber cement siding shall be installed according to manufacturer’s instructions, industry standards and

applicable codes.

Vinyl Siding

Vinyl Siding is installed directly over DuPont

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Tyvek

WRBs. Vinyl siding shall be installed in accordance with

manufacturer’s instructions, industry standards and applicable codes, including ASTM D4756-06 Standard Practice for

Installation of Rigid Poly(Vinyl Chloride) (PVC) Siding and Sofﬁt. In high wind areas at gable end walls, FEMA recommends

vinyl siding be installed over wood sheathing rather than over plastic foam sheathing.

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