Proper installation of flashing tape is critical for maintaining a building’s weather resistance and energy efficiency. Dupont flashing tape, including the specialized FlexWrap™ product, provides a barrier against moisture and air infiltration. This article details the installation process, focusing on best practices and specific instructions for both standard Dupont flashing tape and FlexWrap™.
Understanding Dupont Flashing Tape
Dupont flashing tape is a self-adhering, waterproof tape designed to seal areas susceptible to water entry, such as around windows and doors. When correctly applied, it contributes to the longevity of a building and improves its energy efficiency. Different types of Dupont flashing tape are available, with FlexWrap™ offering enhanced flexibility for irregular surfaces.
Tools and Materials Needed for Installation
Successful installation requires specific tools and materials. These include Dupont flashing tape or Dupont FlexWrap™ products, a utility knife or scissors for cutting the tape, a J-roller or hand roller to ensure adhesion, measuring tape, cleaning cloths, and potentially caulk or sealant as recommended by the manufacturer. A primer may also be necessary for OSB or low-temperature surfaces. Safety gloves and goggles are also recommended.
Surface Preparation
Prior to application, surfaces must be clean and dry. Ensuring proper adhesion relies on a prepared substrate.
Step-by-Step Installation: Standard Flashing Tape
The installation process for standard Dupont flashing tape involves several key steps.
- Sill Flashing: Cut the tape to a length 12 inches longer than the window sill width. Center the tape on the sill, allowing at least 6 inches of overlap on each side. Press the tape down, starting from the center and working outwards. A J-roller is essential for ensuring full adhesion, particularly at the corners. Excess tape at the corners should be cut and folded over the sheathing to create a watertight seal.
- Window Installation: Once the sill flashing is in place, the window can be set into the rough opening and secured according to the manufacturer’s instructions. Proper alignment and squaring of the window are crucial.
- Jamb Flashing: Cut two pieces of Dupont flashing tape to the height of each jamb (the sides of the window). Center the tape over the top of the window and apply it across the header. Overlap the jamb flashing and press down firmly to create a continuous seal. Use a J-roller to smooth the tape and ensure complete adhesion.
- Tyvek® WRB Integration: Install Tyvek® weather-resistant barrier (WRB) over the top edge of the head flashing. Shingle-lap the WRB over the flashing, sealing all overlaps with Tyvek® tape, following the manufacturer’s guidelines.
Installing Dupont FlexWrap™
Dupont FlexWrap™ is designed for more challenging applications, such as arched windows, curved walls, and pipe penetrations, due to its increased flexibility.
Installing FlexWrap on Window Sills: Cut the FlexWrap to a length at least 12 inches longer than the window sill. Apply the FlexWrap starting from the center of the sill and press it into place, allowing at least 6 inches on each side. Mold the tape into place, ensuring no wrinkles or air pockets are present. Use a J-roller to ensure good adhesion.
Installing FlexWrap Around Pipes: Cut the FlexWrap to a length that will wrap around the pipe with at least 3 inches of overlap. Position the tape over the pipe and press it into place, conforming to the surface. A utility knife can be used to cut slits around the pipe for a tighter fit. Overlap the tape as needed and roll it to ensure a solid seal.
Tips and Best Practices
Several best practices contribute to a successful Dupont flashing tape installation. Proper overlap is paramount; always overlap the flashing tape by at least 2 inches at seams and corners to maintain a continuous barrier. Inspect adhesion after installation, paying particular attention to corners, to ensure the tape is fully adhered.
Dupont FlexWrap™ Specifications
Dupont FlexWrap™ exhibits specific physical properties. Available roll sizes include 6-inch width by 75-foot length and 9-inch width by 75-foot length. Each case contains 4 rolls, with 16 cases per pallet, resulting in 64 rolls per pallet.
According to testing conducted according to ASTM E1677, the assembled air leakage for DuPont™ FlexWrap™ is less than 0.04 cfm/ft2 (0.2 L/s • m2). The product maintains this performance both before and after thermal aging between 0–180°F.
The following table summarizes key test results:
| TEST METHOD | TEST TITLE | PROPERTY | RESULTS |
|---|---|---|---|
| AIR | Assembly Air Leakage | < 0.04 cfm/ft2 (0.2 L/s • m2) | |
| ASTM E1677 | Standard Specification for Air Barrier (AB) Material or Assemblies for Low-Rise Framed Building Walls |
Benefits of Proper Installation
Proper Dupont flashing tape installation offers several benefits, including enhanced durability of the building envelope, improved energy efficiency, and prevention of costly repairs due to water damage. Adhering to manufacturer’s instructions and installation guidelines is essential to maintain the integrity of the building.
Conclusion
Proper Dupont flashing tape installation, whether using standard tape or Dupont FlexWrap™, is essential for maintaining a building’s weather resistance and energy efficiency. By following the detailed steps outlined in this guide and adhering to manufacturer guidelines, a durable, weatherproof barrier can be achieved around windows, doors, and other vulnerable areas, providing lasting protection. Careful attention to surface preparation, proper overlap, and thorough adhesion are key to a successful installation.