Copyright ©2012 E. I. du Pont de Nemours and Company. All Rights Reserved. Rev. 2/12 11
DuPont
™
Tyvek
®
Water-Resistive and Air Barriers Installation Guidelines
Use of Temporary Fastening Methods
Fastener selection and fastening schedule is a function of holding power during
exposure and durability while in service. DuPont
™
Tyvek
®
Water-Resistive and Air
Barriers Installation Guidelines require the use of cap fasteners (nail, staple and screw)
or 1” crown staples as the means for permanently attaching DuPont
™
Tyvek
®
WRBs. In
addition to fastener selection, DuPont requires a permanent fastener schedule
between 6 to 18 inches, anchored to the studs. These fasteners and schedule are
considered a permanent means of attachment and provide substantial holding power
during exposure. Cap fasteners provide additional protection against moisture and air
infiltration at the fastener location, especially when the cladding is in intimate contact
with the water-resistive barrier and there is minimal drainage.These fastening
guidelines minimize the number of penetrations while maintaining a balance of product
durability during exposure. Sheathing other than structural OSB and plywood should
not be relied on as the fastening base. This includes, but is not limited to, foam,
fiberboard, and gypsum sheathing materials.
Use of recommended permanent fasteners at reduced schedules, other mechanical
fasteners such as smaller staples (slap staples) and adhesives are considered temporary
fastening methods because they do not have substantial holding power and may not
provide adequate durability while in service. Temporary fasteners should not be relied
upon to permanently attach DuPont
™
Tyvek
®
WRB. Because these fasteners have
limited holding power, they are not supported by DuPont as the primary means of
attachment.
Temporaryfasteningmethodscanbeusedifthefollowingguidelinesarefollowed:
• TemporaryfasteningmethodsshallonlybeusedtotacktheDuPont
™
Tyvek
®
WRB
in place when a permanent fastener is installed immediately after the temporary
fasteners are installed. In this case, permanent fasteners include cladding fasteners
such as brick ties, lath fasteners for traditional stucco, external foam board
fasteners, or siding installed with nails. Cladding shall be installed according to
applicable building codes and industry standards.
• Whenusingadhesives,verticalstripsspacedapproximatelyevery24to36inchesor
along every other stud line are acceptable. Vertical strips may be applied to the outer
face of the sheathing or directly to the studs for open stud construction. When using
adhesives, care must be taken to avoid excessive surface coverage as this may
impact the vapor permeability in that area. Adhesives should be evaluated for
compatibility with DuPont
™
Tyvek
®
WRBs.
• Whenusingtemporarymechanicalfasteners,theyshouldbeusedminimallytotack
the DuPont
™
Tyvek
®
WRB in place. Small staple fasteners are acceptable with OSB,
plywood and exterior gypsum sheathing only. Small staple fasteners should not be
used with fiberboard or foam sheathing. Temporary fastener schedule should not
exceed four (4) fasteners per square yard. Tape all tears and localized damage. For
larger holes (greater than 1”) follow instructions on page 7 of this guide.
Selection and use of temporary fastening methods is an option dependent on building
schedule, cladding type and local building practices.
NOTE: These Temporary Fastening Guidelines are subject to change based on new
technology or testing information and may be superseded at any time. It is always
important to follow the latest guidelines which may be found on
www.Weatherization.Tyvek.com.
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