Tyvek® allows faster dryingįor a weather barrier to be considered vapor permeable, it must have a vapor permeance of at least 5 perms (IRC) or 10 perms (IBC) as tested per ASTM E96 B (desiccant method). Improper taping can allow water to enter the system, reducing the performance of the ZIP System® Wall Sheathing and the entire wall system.Ĭonversely, Tyvek ® building wraps are comprised of a precisely bonded barrier, for high bulk water hold-out and breathability. So bulk moisture absorption is never an issue. The bulk water hold-out capability of ZIP System® Wall Sheathing depends on taping of all joints and corners. Tyvek® provides superior water resistance Failure to do so can result in damage to the panels, potentially compromising the integrity of the wall system, if not carefully repaired. So, it must be handled with care to avoid taking on moisture before installation. ZIP System® Wall Sheathing is constructed of an oriented strand board (OSB) structural panel with a resin-impregnated Kraft paper overlay. And even larger tears or holes can be repaired, using a combination of the same Tyvek ® product and Tyvek ® tape. Any small punctures that may occur can be easily repaired, using Tyvek ® tape. Tyvek® is durable in tough conditionsĭuPont™ Tyvek ® weather barriers are constructed of a strong, nonwoven material, so they are resistant to tearing and puncturing and stand up to the demands of job-site conditions. Several reasons were cited, including the need for every seam of ZIP System® Wall Sheathing to be taped and rolled the need to maintain precise 1/8” spacing between every seam and the need fordry conditions and surfaces before taping.īy comparison, Tyvek ® products can be installed under most weather conditions, and underlying sheathing can be installed more quickly, because every corner and seam does not need to be taped and rolled. Test results showed no significant installation time advantage for the ZIP Systems® wall sheathing and tape over the DuPont™ Weatherization System. Each crew was timed while installing the ZIP System® and the complete DuPont Tyvek® Weatherization System and sheathing, following manufacturers’ installation instructions, on a framed two-story structure that included three standard double-hung and three round top windows. In testing conducted by the Home Innovation Research Lab at the request of DuPont, five installation crews participated in a series of experiments designed to test the ZIP System® manufacturer’s claims of easier, faster installation. And Tyvek® weather barriers deliver superior overall performance, compared to ZIP System® Wall Sheathing, in five key areas: The unique material and building science behind DuPont Building Envelope Solutions provides the optimal balance of protection against air and bulk water infiltration and vapor permeability. DuPont™ Tyvek® weather barriers are trusted by building professionals to provide performance that ZIP System® wall sheathing and tape can’t.
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