In this video, you will learn how to Flash a wood buck window using DuPont™ StraightFlash™
and DuPont™ FlexWrap™ NF self-adhered flashing products, before integrating the
flashing with an application of DuPont™ Tyvek® Fluid Applied WB. First, prime the
CMU around the window opening with a DuPont recommended spray primer, such as 3M's™
High Strength 90 or DuPont's adhesive primer, working from the sill up apply primer a minimum
of 2" onto the face of the wall. Apply the FlexWrap™ NF onto the sill extending the
Flashing approximately 6" up the jam. Start in the middle and work your way to both sides
being careful not to overstretch the FlexWrap™ NF. Roll it tightly into the corner without
extending it and fold it up onto the jams. After the flashing is adhered to the sill
press out the corners and the FlexWrap™ NF will stretch and extend leaving a continuous
flashing membrane across the corner. Do this for both corners then roll the FlexWrap™
NF down onto the face of the wall, make sure it's fully adhered to the wall and use a J
roller to insure maximum adhesion. Next, using DuPont™ StraightFlash™ apply the jam and
head flashing. Working your way up from the bottom, place the flashing onto the face of
the jam and extend a minimum of 2" from the jam onto the face of the wall. In a later
step, the StraightFlash™ on the CMU outside the window opening will be covered with the
Tyvek® Fluid Applied WB to seamlessly integrate the flashing and the air and water barrier.
Make sure that the StraightFlash™ is pressed firmly and it meets at the crevices so that
it's fully adhered and has a tight bond. Continue that same procedure on the other jam and use
a J roller for maximum adhesion. The window head is next, work from the center out, trying
not to stretch the FlexWrap NF. Roll it into the corner and press it down firmly. do the
same procedure for the other side of the head. Roll the FlexWrap™ NF onto the face of the
wall, gently stretching the corners and making sure the flashing is fully adhered. You now
have a window opening protected by a self-adhered flashing membrane, the adhesive on the back
of the FlexWrap™ NF and StraightFlash™ is butyl-based so it won't run or stain like
asphalt-based adhesives. Use a J roller on the flashings to maximize adhesion and form
a tight seal. Once that is done, the wall is ready to receive the Tyvek® Fluid Applied
WB Air and Water Barrier, in this case being applied using a Graco pressure roller which
is hooked to standard spray pump equipment and feeds the Fluid Applied WB through the
hose to the roller. This is the DuPont™ preferred application method for Tyvek® Fluid
Applied WB.