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DuPont™ Tyvek® is very fine polyethylene fibers (seven times finer, in fact, than human hair) bonded by heat and pressure to create a printing substrate that isn’t paper, fabric, or film, but combines the best properties of all three.
The best time to install DuPont™ Tyvek ® Water-Resistive Barriers is: • AFTER the roof sheathing is installed • AFTER the step flashings and kickout flashings have been installed
DuPont ™ Tyvek ® ThermaWrap LE must be installed with shiny, metallic side facing towards a clear ¾ inch minimum air space to obtain the installed R-Value benefits. ThermaWrap ™ LE will still act as a water-resistive barrier without an air space.
Is DuPont ™ Tyvek ® a vapor barrier? No, DuPont ™ Tyvek ® is not a vapor barrier. It is made with unique material science to keep air and bulk water out while allowing moisture vapor inside walls to escape. Can I use a Tyvek ® weather barrier in combination with a vapor barrier?
Air and Water Barrier Performance • Unique nonwoven structure of Tyvek HomeWrap makes it breathable, allowing moisture vapor to pass through. This helps promote drying in wall systems, to help prevent mold and water damage. • Tyvek ® HomeWrap stops air movement through the walls,
DuPont™ Tyvek® ThermaWrap™ will still act as a water-resistive barrier without an airspace. Refer to the DuPont ™ Tyvek ® ThermaWrap ™ Fact Sheet for more information.
DuPont™ Tyvek® HomeWrap® is the original house wrap, incorporating unique material science that helps keep air and water out, while letting water vapor escape. As a result, it can contribute to improved building durability by helping to protect homes against damaging wind and rain that can penetrate the exterior cladding.
