5 Best DuPont FlexWrap Alternatives (Reviewed)

DuPont FlexWrap has been used for years by contractors and builders to keep moisture and air from getting through door sills and windows.

In addition to providing defense against corrosion, mold, and water damage, this DuPont window flashing also dramatically reduces HVAC costs while enhancing air quality.

The advantages of selecting DuPont FlexWrap are numerous. However, there are a few more reasons why its alternatives might be of interest to you. The cost of DuPont FlexWrap is high.

Additionally, this might not be the most economical option if you need to seal a large number of windows. Additionally, local stores might not carry DuPont FlexWrap. Additionally, if you order it online, you might have to wait days.

Finding some of the top DuPont FlexWrap substitutes is a smart idea for the reasons listed above. I’ll outline and contrast a few window flashing alternatives to DuPont FlexWrap in the guide below.

1. Flex Flashing Tape by James Hardie Wrap

James Hardie is a well-known name in the building sector. This company makes its window flashing tape, just like DuPont. This tape sticks securely to window sills and doors. It is pliable and reasonably simple to use.

The most notable feature of this DuPont FlexWrap substitute is that it is devoid of volatile organic compounds (VOCs), asphalt, and other solvents that could contaminate the air in your house.

James Hardie’s window flashing tape has a high water resistance. It is breathable, though. As a result, it enables the walls to release moisture, keeping them dry. This makes a significant contribution to stopping the growth of mold.

The James Hardie Wrap Flex can be applied to windows with irregular shapes because of its design. It has the same feature as DuPont FlexWrap.

The thickness of DuPont FlexWrap is 64 mils, while that of James Hardie Wrap Flex is 60 mils. As a result, the latter is thicker and provides superior water resistance.

DuPont FlexWrap has a 270-day UV resistance period. James Hardie Wrap has a 180-day UV exposure tolerance. James Hardie’s tensile strength is 18 lbs/in, while DuPont FlexWrap’s is 30 lbs/in.

James Hardie Wrap Flex is a good substitute, but it isn’t as effective as DuPont FlexWrap.

2. Window Seal for Poly Walls

The Window Seal from Poly Wall is another well-liked substitute for DuPont FlexWrap. This 20-millimeter-thick window flashing tape is suitable for use on window frames, door frames, and other construction seams. Poly Wall window flashing tape is a long-lasting choice because it self-adheres and seals.

Like DuPont FlexWrap, Window Seal is comparatively simple to use. Round or custom-shaped windows are better suited for Poly Wall Window Seal. Additionally, it can be applied over staples, nails, and fasteners.

It does a fantastic job of keeping moisture out, which stops mold from growing. Moreover, it is elastic. As a result, you don’t need to be concerned about it breaking apart in the event of structural movements.

The temperature range that Window Seal can tolerate is 40°F to 120°F. Poly Wall Window Seal is composed of rubberized asphalt, as opposed to butyl like DuPont.

3. Window Flashing with ArcFlash

ArcFlash is the place to go if you’ve been searching for a thicker substitute for DuPont FlexWrap.

ArcFlash is 70 mils thick, in contrast to 64 mils for DuPont window flashing. This provides you with an additional line of defense against water damage.

Poly Wall also produces ArcFlash. It is a stretchable asphalt tape that adheres to itself and heals itself. It is specifically made for arched windows, as the name implies.

Therefore, you should use this flashing tape, which is specifically designed for such applications, if your windows are curved or round.

It can be applied over fasteners and nails. It also resists cracking very well. ArcFlash’s laminated polyethylene backing is one of its unique characteristics. As a result, it is more resilient than DuPont FlexWrap.

4. Original Tite Seal

Another great DuPont FlexWrap substitute is Tite Seal Original, which is manufactured by Cofair.

Rubberized asphalt is used in its construction, and like DuPont FlexWrap, it sticks well to a variety of surfaces, including brick, stucco, vinyl, metal, wood, and siding. Therefore, the substrate on which you can use this product is unlimited.

Tite Seal Original stops moisture and air from entering after it is installed. Tite Seal is widely accessible, which contributes to its popularity. It is available on Amazon or at the Home Depot location closest to you.

The UV stabilizer in Tite Seal Original is a polymer surface. Tite Seal may be exposed to sunlight for up to six months while construction is underway.

Although it’s not as long as DuPont FlexWrap can tolerate UV rays, you still have enough time to complete your project.

5. Flex WindowWrap

The WindowWrap Flex is the only substitute for DuPont FlexWrap that performs better than it in numerous industries. You can apply this tape to joints, windows, and doors.

In contrast to DuPont FlexWrap, which only provides air and water resistance, this wrap also lowers noise levels and keeps insects—no matter how tiny—from getting through.

It is a window flashing made of rubberized asphalt. However, a polythene film laminates it on the outside. It is incredibly durable and stretchable.

It adheres well to a variety of surfaces, including plywood, OSB, steel, aluminum, and drywall. It self-heals, so you don’t need to worry about applying nails and fasteners.

It can only be exposed to UV light for three months, despite being a powerful window flashing device. To improve waterproofing, this window flash can be applied externally.

It is ideal for curved doorways and windows. It can also be used in place of kraft paper and metal flashing. If that wasn’t enough, this DuPont FlexWrap comes with a limited warranty of ten years.

What is the Difference Between DuPont FlexWrap and Its Alternatives?

We can all agree that one of the best window flashing tapes available is DuPont FlexWrap. It outperforms most tapes in terms of tensile strength, temperature, water, UV, and air resistance.

You must therefore be aware of its superior performance when weighing its alternatives.

However, we cannot overlook the high cost of DuPont FlexWrap. Therefore, if you are on a limited budget, the aforementioned options may be helpful.

Additionally, you can request these substitutes if your local store does not carry DuPont FlexWrap.

Are These Substitutes Compatible with DuPont Tyvek Home Wrap?

The same company’s materials should be used to create a building envelope. Please use DuPont FlexWrap when installing Tyvek house wrap.

Because the adhesion may not be compatible, combining window flashing tape with other house wraps can have disastrous results.

This also holds true for the window flashings mentioned above as alternatives to DuPont FlexWrap. You won’t encounter any issues if you follow their instructions, whether it’s for Cofair or Polywall.

Additionally, remember that the warranty may be voided if window flashing and house wraps are combined.

Where Can I Purchase FlexWrap from DuPont?

The inability to locate DuPont FlexWrap in local stores is one of the primary reasons consumers search for alternatives. Your local Home Depot store is the best place to check if you’re wondering where you can get it.

You should purchase it online if you can’t find it there. The latter solution’s only drawback is that delivery will take longer. You absolutely cannot overlook any of the above options if you are pressed for time.