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Tyvek® Common Questions (FAQs)

We’ve gathered the most commonly asked questions about Tyvek. If your question isn't answered here, you may also contact us with any questions you may have.

Installation & Warranty

Can DuPont™ Tyvek® be installed over old house wrap?

Yes, DuPont™ Tyvek® can be installed over old house wrap as long as the existing house wrap is Tyvek®.

Installation and Warranty

How long can DuPont™ Tyvek® be exposed before siding?

Tyvek HomeWrap, Tyvek DrainWrap and Tyvek StuccoWrap should be covered within 120 days (4 months).

Is it necessary to remove old building paper before applying DuPont™ Tyvek®?

No, it is not critical to remove building paper prior to installing Tyvek. However, it is necessary to carefully inspect for damaged areas that may not be clearly visible under building paper. Since building paper does not have the same breathability characteristics of DuPont™ Tyvek® HomeWrap®, the wall may lose some of its ability to dissipate moisture to the outside if the paper is left on the wall.

Can DuPont™ Tyvek® be used as flashing?

Tyvek® weather resistive barriers have not been tested or approved as a flashing material. DuPont™ introduced the DuPont™ Flashing System that provides comprehensive protection from water leaks. It is designed to help direct water to the building exterior instead of trapping it inside the wall system and causing water damage.

Should DuPont™ Tyvek® HomeWrap® be placed over or under the sheathing?

DuPont™ Tyvek® HomeWrap® can be used either over or under sheathing. When DuPont™ Tyvek® HomeWrap® is used under sheathing, it functions only as an air barrier and does not protect the sheathing as a secondary water barrier. DuPont™ Tyvek® HomeWrap® has been used directly over studs where there is no sheathing, although use of sheathing is a highly recommended building practice.

Can you use DuPont™ Tyvek® HomeWrap® in combination with a vapor barrier?

Using a vapor barrier depends on how the rest of the wall system is built and the climate the wall is in. If the majority of the year is spent heating the home where the inside temperature is greater than the outside, it is generally good to use a vapor retarder behind the interior drywall. In hot humid climates, vapor barriers should not be used.

Can DuPont™ Tyvek® HomeWrap® be used with the lettering facing in?

DuPont™ Tyvek® HomeWrap® and DuPont™ Tyvek® StuccoWrap® are equally effective in both directions. However, DuPont™ Tyvek® StuccoWrap® has a specially engineered surface that should be placed with the grooves in a vertical direction.

What type of fasteners is recommended when installing DuPont™ Tyvek® HomeWrap®?

DuPont™ Tyvek® HomeWrap® can be installed using a variety of fasteners depending on the application. To attach DuPont™ Tyvek® HomeWrap® to wood, insulated sheathing board or exterior gypsum board, use nails with plastic washer heads, such as DuPont™ Tyvek® Wrap Caps. You may choose to use wide staples with a minimum 1” crown. For steel frame construction use DuPont™ Tyvek® HomeWrap® Wrap Cap Screws.

What type of Warranty is available for Tyvek® products?

Please see the Warranty page for information.

Can I tape the OSB or sheeting joints and then use Tyvek® HomeWrap?

The house needs some air flow to avoid moisture build up within the home. The manufacturer recommends to only Tape the Tyvek® HomeWrap seams.

Should DuPont™ Tyvek® HomeWrap® be overlapped when installed?

Yes, the DuPont™ Tyvek® HomeWrap® should be overlaid from 6" to 12" and should be seamed up with 3" tape. Due to the ridge, the 3" tyvek tape works best. Also make sure that the DuPont™ Tyvek® HomeWrap® is installed similar to shingles on a roof, so that the water will not run behind the bottom layer.

Can DuPont™ Tyvek be used under cedar siding?

Yes, Dupont™ Tyvek® DrainWrap™ can be used under cedar siding. It is recommended that the cedar siding be installed per manufacturer’s guidelines and recommendations by wood siding associations, such as the Western Red Cedar Lumber Association, including priming all surfaces including the back and ends before installing. Additionally, the use of furring strips will help promote drainage of any incidental water that may penetrate the cedar cladding.

Why is Tyvek® DrainWrap™ recommended behind cedar siding?

Tyvek® DrainWrap™ offers the unique combination of a drainage system and a weather resistant barrier in a single product and promotes outstanding bulk water drainage behind siding such as primed cedar by channeling moisture safely to the outside.

Product Questions

If I insulate, why do I need a housewrap?

The installed R-value of insulation is only realized IF the air within the wall cavity stays still and dry. An average 8-mph wind can easily penetrate cracks and crevices even in new homes. You could be losing up to 30 percent of the performance of your insulation. DuPont™ Tyvek® HomeWrap® is designed to help block air from getting inside walls. Properly installed it helps keep drafts out and protects your insulation’s rated R-value. And, just like air gets in, so can water and moisture. DuPont™ Tyvek® HomeWrap® gives you the added benefit of helping to protect your walls from water and moisture.

What is the difference between DuPont™ Tyvek® HomeWrap® and black paper?

Black paper or building paper was not designed as an air retarder like DuPont™ Tyvek®. Unlike DuPont™ Tyvek®, building paper can absorb water. Building paper tears easier than DuPont™ Tyvek® and can degrade over time when under continual exposure to water. Building papers are less permeable to moisture vapor transfer than Tyvek increasing the potential moisture vapor trapped inside the wall could cause mold, mildew and rot.

What is the difference between DuPont™ Tyvek® and other house wraps?

Many other wraps are perforated, which means in order for them to breathe, the manufacturer has punched holes in them, resulting in a reduction of air and water holdout effectiveness. DuPont™ Tyvek® is a non-perforated, nonwoven product with microscopic pores that are so small air and bulk water have a difficult time passing through but since DuPont™ Tyvek® is breathable, moisture vapor can easily escape from the wall.

Can you use DuPont™ Tyvek® under any primary facade?

Yes, it can be used under any façade including brick, stucco, vinyl, cedar siding, and stone. Proper installation under each façade is essential to ensure DuPont™ Tyvek® provides the maximum level of air infiltration resistance and bulk water holdout.

Can I use DuPont™ Tyvek® StuccoWrap® under brick?

Yes. It is perfectly acceptable to use DuPont™ Tyvek® StuccoWrap® under brick. Whether using DuPont™ Tyvek® HomeWrap® or DuPont™ Tyvek® StuccoWrap® under brick it is important to follow brick manufacturer’s guidelines regarding the use of an air space between the brick veneer and sheathing. Typically this space is 1"-2" and will act as a drainage plane if incidental moisture were to penetrate the brick.

How many rolls of DuPont™ Tyvek® HomeWrap® are required for a typical two-story house?

For a typical two story, 2500 square foot house, the general rule of thumb is two rolls of DuPont™ Tyvek® size 9’ x 150’ should be adequate to wrap the house. However, this estimate may vary slightly depending on the house elevation.

How many feet on a roll of DuPont™ Tyvek® Tape?

There are 165 feet on a roll which will be enough to tape a 9’ x 150’ roll.

Is DuPont™ Tyvek® a vapor barrier?

No, DuPont™ Tyvek® is not a vapor barrier. It is breathable, allowing moisture vapor to pass through it.

Why should I tape seams in the DuPont™ Tyvek®?

Taping the seams with DuPont™ Tyvek® Tape gives you the best Tyvek® to Tyvek® adhesion, optimal protection against air and bulk water penetration, and extra durability protection during the building’s construction phase.

Does DuPont™ Tyvek® HomeWrap® make a house too tight?

With more energy efficient construction, "building tight; ventilating right" is the best practice. Mechanical ventilation is more important with today’s sophisticated energy saving home features. However, blower door testing on homes wrapped with DuPont™ Tyvek® show natural air exchange rates per hour that are well within acceptable guidelines per ASHRAE Standard 62.

What DuPont™ Tyvek® Products are available at DIY Home Center?

What appearance does that HomeWrap and Tyvek Tape have?

DuPont Tyvek HomeWrap and Tyvek Tape have the logo printed on it.

 

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