Installation Guide
Copyright ©2016 E. I. du Pont de Nemours and Company. All Rights Reserved. K27349 Version 4/16 5
Installation of Integral Flanged Windows in Recessed Openings
Before Water-Resistive Barrier (WRB) Is Installed
DO NOT STRETCH DuPont
™
FlexWrap
™
NF when installing along the length of sills or
jambs. DuPont
™
FlexWrap
™
NF is only intended to be extended when covering corners
or curved sections.
DuPont
™
self-adhered flashing systems products perform best when installed at
temperatures above 25°F (–4°C).
Avoid placing DuPont
™
Tyvek
®
Wrap Cap Fasteners where flashing or DuPont
™
Tyvek
®
Tape will be installed; however, DuPont
™
Tyvek
®
Wrap Cap Fasteners can be applied
over the flashing.
Adverse weather conditions or cold temperatures may require use of a primer to
promote adhesion of DuPont
™
self-adhered flashing products to most common building
materials. Concrete, masonry, and fiber-faced exterior gypsum board require the use of
DuPont
™
Adhesive/Primer.
Please call 1-800-44-Tyvek (800-448-9835), visit www.weatherization.tyvek.com, or
consult your local DuPont
™
Tyvek
®
Specialist for additional information and installation
support.
Key Installation Requirements for Drainable Window / Door
Installation Under the Limited Product and Labor Warranty
When flashing windows or doors, the following principles must be followed:
• When installed properly, DuPont
™
StraightFlash
™
, DuPont
™
FlexWrap
™
NF, and
DuPont
™
Flashing Tape provide nail sealability at window/door openings to help
protect critical window-wall interfaces. Metal sill pan flashing may be used, but must
not replace flexible sill flashing that provides nail sealability.
• DuPont
™
self-adhered flashing systems products comply with AAMA 711-13,
Voluntary Specification for Self Adhering Flashing Used for Installation of Exterior
Wall Fenestration Products, which has a modified version of ASTM D 1970 that is
more representative for vertical wall applications.
• Direct water onto an acceptable air and water barrier drainage plane with an
unobstructed path to the exterior of the wall. Provide a drainage path for any water
intrusion through the window/door attachment system that collects at the sill.
• Properly integrate flashing with acceptable DuPont
™
Tyvek
®
WRB in accordance with
the details in this installation guideline. DuPont
™
self-adhered flashing systems
products must be applied with a minimum 2” lap onto the WRB.
• DuPont requires that DuPont
™
FlexWrap
™
NF and StraightFlash
™
be covered within
nine months (270 days) of installation. DuPont requires that DuPont
™
Flashing Tape
be covered within four months (120 days) of installation.
• Ensure that window / door and flashing system design takes into account common
factors that will impact performance, such as:
– Climate considerations: Rainfall, Wind, Temperature (hot / cold cycles), Humidity
– Building design: Window / Wall Design (overhangs, recessed openings, bump-
outs), Wall Assembly (wood frame or masonry), Window System (wood or vinyl),
New Construction or Replacement Window drainage path
– UV exposure prior to the construction of the exterior facade
• Field testing the window / door and wall installation as a complete system is a
recommended best practice.
• Use of trained installers is highly recommended.