Introduction
FortiFlash is a self-adhered waterproof flashing membrane designed for long-term protection against water intrusion in residential and commercial construction projects. It is engineered for use around windows, doors, and other vulnerable areas where water resistance is critical. The product is part of the Henry 1-2-3 Moisture Control System™ and comes with a 15-year warranty that covers both materials and labor for warranted repairs.
This guide provides a detailed overview of the installation process for FortiFlash, including product specifications, installation methods, and compatibility with other materials. The information is based on the technical data and downloadable documentation provided by the manufacturer.
Product Overview
FortiFlash and FortiFlash Butyl Variants
Henry offers two primary versions of FortiFlash: the standard FortiFlash and FortiFlash Butyl. Both products are self-adhered and designed for use in a variety of weather conditions, though they differ in their adhesive properties and temperature tolerances.
- FortiFlash is available in 25 mil and 40 mil thicknesses, with roll widths ranging from 4 to 36 inches and a standard 75-foot length for most sizes.
- FortiFlash Butyl is available in 20 mil and 30 mil thicknesses, with roll widths from 4 to 18 inches and a 75-foot length. It is suitable for installation in temperatures as low as 25°F and can withstand extreme temperatures up to 250°F.
Both versions are compatible with a range of sealants, including Moistop® Sealant, and are designed to self-seal around nails and fasteners to maintain watertight integrity.
Key Features
The following features are common to both FortiFlash and FortiFlash Butyl:
- Rubberized asphalt core to prevent delamination and tearing
- Self-sealing properties around fasteners for long-term watertightness
- AAMA 711 compliance, ensuring compatibility with aluminum window frames
- Easy installation with no need for mechanical fasteners
- 15-year warranty when used as part of the Henry 1-2-3 Moisture Control System™
Installation Methods
Installation of FortiFlash involves several key steps, including preparation, application, and integration with other system components such as weather-resistive barriers and sealants. The following sections outline the general procedures and specific methods for different types of window and door installations.
General Installation Steps
Surface Preparation
The substrate must be clean, dry, and free of dust, dirt, and debris. Any existing sealants or adhesives should be removed. The surface should be primed if necessary, though this is not always required for FortiFlash.Unrolling the Membrane
Carefully unroll the FortiFlash membrane to the desired location. Avoid stretching or tearing the material during unrolling.Application
Press the membrane firmly onto the surface to ensure good adhesion. Use a hand roller or squeegee to remove air pockets and ensure full contact with the substrate.Sealing Edges and Overlaps
Overlaps between rolls should be at least 2 inches. Use a compatible sealant, such as Moistop® Sealant, to seal all edges and joints.Integration with Other System Components
FortiFlash is designed to work in conjunction with Blueskin® VP100 Self-Adhered WRB and other components of the Henry 1-2-3 Moisture Control System™. Ensure that all components are properly aligned and integrated for optimal performance.
Flanged Window Installation Methods
For flanged windows, Henry provides several installation methods depending on the level of wind and water exposure. The following methods are available for both pan flashing at the sill and low exposure scenarios:
Method A – Pan Flashing at Sill
This method is recommended for areas with high wind and water exposure. The process involves:
- Applying the FortiFlash membrane as a pan flashing at the sill level
- Extending the membrane up the sides of the window frame
- Sealing the edges with Moistop® Sealant
- Ensuring that the flashing is integrated with the weather-resistive barrier
Downloadable installation guides for this method include:
- VPWRB-6A1-P1: Flanged Window Section Method A1 – Pan flashing at sill
- VPWRB-6A1-P2: Flanged Window Sequence Installation Method A1 – Pan flashing at sill
Method B – Low Wind and Water Exposure
This method is suitable for areas with lower exposure to wind and water. The process includes:
- Applying the FortiFlash membrane directly to the flange of the window
- Ensuring that the membrane overlaps the flange by at least 2 inches
- Sealing all edges and joints with a compatible sealant
- Integrating with the weather-resistive barrier as needed
Downloadable guides for this method include:
- MAWRB-6B-L1: Flanged Window Section Method B – Low wind and water exposure
- MAWRB-6B-L2: Flanged Window Sequence Installation Method B – Low wind and water exposure
Method B1 – Additional Sill Flashing
This method includes additional flashing at the sill for enhanced protection. The process is similar to Method B but includes an extra layer of FortiFlash at the sill level to provide additional water resistance.
Downloadable guides for this method include:
- VPWRB-6B1-P1: Flanged Window Section Method B1 – Pan flashing at sill
- VPWRB-6B1-P2: Flanged Window Sequence Installation Method B1 – Pan flashing at sill
Compatibility and Integration
FortiFlash is designed to be part of a comprehensive moisture management system. It is compatible with the following products:
- Blueskin® VP100 Self-Adhered WRB: A high-performance weather-resistive barrier that provides an additional layer of protection against water intrusion.
- Moistop® Sealant: A premium sealant that is compatible with FortiFlash and is used for sealing edges, joints, and overlaps.
- WeatherSmart and WeatherSmart D: Systems that enhance the performance of the building envelope by providing additional protection against wind and water.
These products work together to form the Henry 1-2-3 Moisture Control System™, which is backed by a 15-year warranty covering both materials and labor for warranted repairs.
Technical and Installation Considerations
Several technical considerations should be taken into account when installing FortiFlash:
- Temperature Range: FortiFlash Butyl is suitable for installation in temperatures as low as 25°F, making it ideal for colder climates. Standard FortiFlash should be installed in moderate to warm conditions.
- Substrate Compatibility: The membrane is compatible with a variety of substrates, including wood, concrete, and masonry. It is also AAMA 711 compliant, ensuring compatibility with aluminum window frames.
- Split-Back Release Liner: The split-back release liner allows for easy handling and integration with weather-resistive barriers. This feature is particularly useful for large-scale installations.
- Self-Adhesion: The product adheres well to most surfaces without the need for mechanical fasteners, reducing installation time and labor costs.
Troubleshooting and Common Issues
While FortiFlash is designed for ease of installation and long-term performance, certain issues may arise during or after installation. The following are common issues and potential solutions:
- Air Pockets or Poor Adhesion: These can occur if the membrane is not pressed firmly onto the surface. Use a hand roller or squeegee to ensure full contact with the substrate.
- Fastener Punctures: The membrane is designed to self-seal around nails and fasteners. If a puncture is large or does not seal, apply a bead of Moistop® Sealant to the affected area.
- Edge Sealing Issues: Overlaps should be at least 2 inches, and edges should be sealed with a compatible sealant. If an edge is not sealed properly, it may lead to water intrusion.
- Compatibility with Sealants: Ensure that the sealant used is compatible with FortiFlash. Moistop® Sealant is recommended for optimal performance.
Conclusion
FortiFlash is a versatile and reliable self-adhered waterproof flashing membrane designed for use in a variety of construction applications. When installed correctly as part of the Henry 1-2-3 Moisture Control System™, it provides long-term protection against water intrusion and is backed by a 15-year warranty covering both materials and labor. The product is available in multiple sizes and thicknesses, making it suitable for a wide range of projects.
By following the installation methods outlined in this guide, contractors and DIY users can ensure that FortiFlash performs optimally and integrates seamlessly with other system components. Proper surface preparation, adherence to installation best practices, and compatibility with approved sealants and weather-resistive barriers are essential for achieving the best results.