Photo: Yan Krukov

What is better than Tyvek?

While both Tyvek® HomeWrap® and the ZIP System provide air- and moisture-resistance, each has potential problems that may diminish their intended purpose. A better solution to a WRB is Barricade® Building Wrap. Barricade Building Wrap is strong, durable, permeable, and easy to install.

barricadebp.com - A Better Weather-Resistant Barrier than Tyvek & ZIP System

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Tyvek® HomeWrap®* and the ZIP System® are weather resistant barriers (WRB) applied under the siding of a home or commercial building. The goal of both these products is to ensure a structure is air- and moisture-resistant. Proper installation and integration are essential to attaining this goal. However, achievement of this goal is also dependent on the WRBs permeability, so water that penetrates the system can evaporate. Also, the WRB must have excellent strength and durability to minimize damage from outside elements (sun, wind, rain) or rough handling during the installation process. Damage to the WRB dramatically diminishes its performance. While both Tyvek® HomeWrap® and the ZIP System provide air- and moisture-resistance, each has potential problems that may diminish their intended purpose. A better solution to a WRB is Barricade® Building Wrap. Barricade Building Wrap is strong, durable, permeable, and easy to install. It will also maintain its integrity against outside elements and rough handling before, during, and after installation.

ZIP SYSTEM VS TYVEK®

Tyvek® HomeWrap®

Tyvek® HomeWrap® is made from non-perforated, non-woven, high-density polyethylene fibers that are fused together to form a uniform web. The web creates small pores that resist water and air penetration while allowing vapor to pass through. Tyvek® HomeWrap® is equivalent to a Grade-D 60 minute WRB. DuPont™ manufactures the Tyvek® HomeWrap®. A benefit of Tyvek® is it comes in rolls which overlap at the seams to protect the structure from water intrusion. The further advantage of Tyvek® is it allows for weatherboard lap (external cladding) at window heads and other openings in a structure. Another benefit is the installation of Tyvek® is over the open stud framing and sheathing, which saves on material costs.

Disadvantages of Tyvek® House Wrap

There are several problems with Tyvek® House Wrap that diminish its ability to resist water and air. Tyvek ® House Wrap has a tensile strength of only 30/30 lb/in. So, after installation, but before the exterior cladding and final fasteners, Tyvek ® House Wrap may be susceptible to damage due to high winds and moisture exposure. House Wrap has a tensile strength of only 30/30 lb/in. So, after installation, but before the exterior cladding and final fasteners, Tyvek House Wrap may be susceptible to damage due to high winds and moisture exposure. Similarly, Tyvek ® House Wrap has a UV rating of four months. After four months of exposure to UV rays, the wrap may become damaged. House Wrap has a UV rating of four months. After four months of exposure to UV rays, the wrap may become damaged. Tyvek® House Wrap may have a reverse lap, which can trap water. A reverse lap occurs when the horizontal seams are sealed with tape to reduce air leakage. Unfortunately, this can cause water running down the paper face of the upper sheet to flow behind the lower sheet, where the moisture becomes trapped.

The ZIP System

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The ZIP System includes ZIP System sheathing panels and ZIP System tape. The panels are composed of OSB wood structural sheathing with a Grade-D 60 minute WRB exterior facer of medium density phenolic-impregnated polymer-modified material. The seam sealing self-adhesive tape is a polyolefin sheet with an acrylic adhesive backing. The ZIP System is manufactured by Huber Engineered Woods, LLC. An advantage of the ZIP System, is that because the WRB is applied to the ZIP System panels at the factory, installation at the job site should be quick. Also, the ZIP System is resistant to wind damage. A third benefit is the product comes with a 30-year warranty, although it has some constraints.

Disadvantages of ZIP System

There are several problems with the ZIP System that diminish its water- and air-resistance and its warranty advantage. During installation, the ZIP System sheathing panels are butted together with a ⅛ inch gap between the panels. Seam tape is used to cover the gap. The tape is used to flash windows and other openings in the home or building. Unfortunately, improper tape application creates a path for moisture to enter the wall system. In addition, dirt, dust, and low temperatures (below 20°F) reduce the bonding nature of the tape. The ZIP System, application of the WRB to the sheathing occurs at the factory. Consequently, installation of the framing hardware is at times over the WRB. Unfortunately, when water accumulates and runs down the WRB, the hardware installed over the WRB, is more susceptible to corroding than framing hardware installed behind the WRB. Construction of ZIP System Wall Sheathing is with oriented strand board (OSB) structural panels with a resin-impregnated Kraft paper overlay. Therefore, it is prone to absorbing moisture which will damage the panels before installation. Compounding this problem is the ZIP System has a one perm rating. The ZIP System has a UV rating of 3 months. After three months of exposure to UV rays, the system may become damaged. The 30 year ZIP System warranty is void for several reasons: if the tape is exposed to dirt, dust, or cold temperatures, if the tape wrinkles after application, and if it is proven that the structure does not conform to all applicable building codes and industry standards. In addition, the 30-year warranty is not transferable. Barricade House Wrap is a perforated, high-quality, cross-woven polyolefin house wrap that meets and exceeds requirements for 1water- and 2air-resistance. It is also 3permeable. There are several reasons Barricade Building Wrap a better option for a WRB over the ZIP System and Tyvek® HomeWrap®. Barricade House Wrap has a tensile strength (ASTM D-5034) of 63.3 lbs/inch MD, 51.4 lbs/inch CD. Tyvek ® tensile strength is 30 lbs/inch MD, 30 lbs/inch CD, which makes Tyvek ® more susceptible to damage from wind, construction errors, etc. than Barricade Building Wrap.

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tensile strength is 30 lbs/inch MD, 30 lbs/inch CD, which makes Tyvek more susceptible to damage from wind, construction errors, etc. than Barricade Building Wrap. Barricade House Wrap has a UV exposure rating of 12 months. The UV rating for ZIP System is three months, and Tyvek ® is four months. Potential damage due to exposure to the sun’s rays is less for Barricade ® Building Wrap than ZIP System and Tyvek ® HomeWrap ® . is four months. Potential damage due to exposure to the sun’s rays is less for Barricade Building Wrap than ZIP System and Tyvek HomeWrap . Barricade House Wrap is easy to install because it is semi-transparent, (unlike Tyvek ® ) and allows a clear view of the studs and sheathing surface during application. Barricade is also easy to handle, lightweight, and comes in many lengths and widths that can fit the needs of any construction project. ) and allows a clear view of the studs and sheathing surface during application. Barricade is also easy to handle, lightweight, and comes in many lengths and widths that can fit the needs of any construction project. Unlike ZIP System, Barricade House Wrap has superior temperature resistance (AC38 Section 3.3.4: (Cold Mandrel Bend Test) ) which ensures the house wrap won’t crack at low temperatures. Barricade House Wrap has a permeability rating of 11 US perms; therefore, it is considered vapor permeable. ZIP System, however, has a permeance of only one perm, which means it is susceptible to trapping water within the wall system.

*Tyvek® is a registered trademark of DuPont™.

barricadebp.com - A Better Weather-Resistant Barrier than Tyvek & ZIP System

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