P R O D U C T / I N S T A L L A T I O N
I N F O R M A T I O N
United States
R E S I D E N T I A L
WEATHERMATE™Straight Flashing
WEATHERMATE™Straight
Flashing provides a tear-resistant
seal that resists water intrusion
around windows and doors.
It is part of the complete
WEATHERMATE™Weather
Barrier Solutions lineup from
Dow – products designed to
enhance the performance of
the building envelope.
PROPERTIES
WEATHERMATE™Straight
Flashing combines a blue
tough coated woven polypropylene film facer with a butyl rubber adhesive that forms a strong
mechanical and chemical bond to
most building materials. A plastic
film release liner provides a more
consistent peel than plain paper
liners.
WEATHERMATE Straight
Flashing contains no asphalt.
The butyl rubber adhesive technology, a key component of
this flashing, is considered
superior to asphalt adhesives in
compatibility with commonly
used building envelope caulking
materials, insulated and noninsulated sheathing, housewraps
and window casing materials.
Properties of WEATHERMATE
Straight Flashing are presented in
Table 1. Performance testing
results are presented in Table 2.
Installation
Properties of WEATHERMATE™ Straight Flashing
Face Material Composition Coated woven polypropylene film
Face Color Blue
Adhesive Composition Butyl rubber
Adhesive Color Gray
Thickness 30 mil
Release Liner White plastic film
Width 4", 6", 9"
Length 100'
WEATHERMATE™ Straight Flashing Performance Testing
Water Vapor Transmission, ASTM E96, perms < 1
Minimum Application Temperature 30°F
UV Resistance 180 days
frame wall. For information on
using WEATHERMATE Straight
Flashing on other types of
angle. Pull up and temporarily
fasten above window opening
(Figure 1).
wall assemblies, contact your
Dow representative or call
1-866-583-BLUE (2583).
TA B L E 1
TA B L E 2
HOUSEWRAP OVER AN
EXTERIOR SHEATHING ON
A WOOD FRAME WALL
The instructions outlined
here describe how to use
WEATHERMATE™Straight
Flashing to flash a flanged window
installed on a wall assembly
consisting of housewrap over
an exterior sheathing on a wood
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Step 1:
a. After installing housewrap
over rough window openings, make an inverted “Y”
cut in the housewrap at
each window.
b. Fold housewrap in at jambs
and sill, fastening to inside
face of framing.
c. At the top of each jamb, cut the
housewrap 6" at a 45-degree
Figure 1
WEATHERMATE Straight Flashing
P R O D U C T / I N S T A L L A T I O N
I N F O R M A T I O N
Step 2:
Install WEATHERMATE™Sill
Pan according to complete
manufacturer installation
instructions (Figure 2). Seal
overlap seam and top edge
of corner pieces with
WEATHERMATE™Straight
Flashing or WEATHERMATE
™
Flexible Flashing. Note:
WEATHERMATE™Sill Pan
works best when the window
sill is sloped to the exterior.
Figure 2
Alternatively, install a backdam
and WEATHERMATE™Flexible
Flashing on the sill. For complete details, refer to the
WEATHERMATE™Flexible
Flashing product/installation
information sheet (Form No.
179-07302).
Step 3:
a. Apply sealant at window jambs
and head only. Or back-caulk
the window, applying sealant
on the back side of the nailing
flange (Figure 3). Make sure
sealants, housewraps and flashings are chemically compatible.
b. Install window, plumb,
level and square, per manufacturer instructions. Shims
should be placed under
WEATHERMATE Sill Pan, if
necessary.
c. Prepare substrate surface as
Figure 3
necessary to ensure it is
clean, dry and free of grease,
dust or debris.
d. A spray adhesive, such as
3M High Strength 90, is
recommended if applying
WEATHERMATE Flashings
directly to OSB or other
surfaces where additional
adhesion may be required.
Step 4:
a. Apply WEATHERMATE
™
Straight Flashing along
window jambs, overlapping
WEATHERMATE™Sill Pan
or other sill flashing. Always
use firm pressure to press
WEATHERMATE™ Straight
Flashing into place. Consider
using a hand roller or
smoothing tool to ensure a
tight seal. Do not stretch
flashing or force changes in
directional line as this can
cause wrinkling and channels that prevent a smooth
tight seal to the substrate.
b. Install a drip cap, if
applicable.
c. Next, install WEATHERMATE
Straight Flashing along header. Complete overlap the
entire width of the jamb
flashing.(Figure 4).
Figure 4
Step 5:
Fold housewrap flap down and
secure with WEATHERMATE
™
Construction Tape (Figure 5).
Air seal windows around
entire interior perimeter with
GREAT STUFF™Pro Window &
Door insulating foam sealant.
Figure 5
™
IN THE U.S.:
• For Technical Information: 1-866-583-BLUE (2583)
• For Sales Information: 1-800-232-2436
THE DOW CHEMICAL COMPANY
• Building Solutions • 200 Larkin • Midland, MI 48674 • www.insulateyourhome.com
NOTICE: No freedom from infringement of any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with
time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer's use and for ensuring that Customer's workplace and disposal practices are in compliance with applicable laws and other government enactments. The product shown in this literature may not be available for sale and/or available in all geographies where Dow is represented. The claims made may not have been approved for use in all countries. Dow assumes no obligation or liability for the information in this document. References to “Dow” or the “Company” mean
the Dow legal entity selling the products to Customer unless other wise expressly noted. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.
Building and/or construction practices unrelated to building materials could greatly affect moisture and the potential for mold formation. No material supplier including Dow can give assurance that mold
will not develop in any specific system.
Printed in U.S.A. ®™Trademark of The Dow Chemical Company (“Dow”) Form No. 179-07303-0913MCK
or an affiliated company of Dow
McKAY219775
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