Easing into Butyl Technology
Start with Cost-Effective Eaves and Rakes on Synthetic Roof Decks
In parts of the country where mechanically attached synthetic underlayment is installed across the entire deck, adapting to high-performance building practices doesn't have to mean completely overhauling your everyday installation routines overnight. If you are accustomed to running a standard synthetic field underlayment—such as a high-quality Flash Deck® Nail Base—there is a simple, high-leverage way to dramatically upgrade your building envelope: Easing into premium protection by starting with cost-effective eaves and rakes.
By starting with cost-effective eaves and rakes, your company can experience the advanced protection and performance benefits of premium butyl technology right where it matters most.
A Unified Standard: One Detail for Every Application
It is worth noting that this edge-first perimeter method is not a workaround—it represents the top tier of our three eave protection levels (Standard, Enhanced, and Superior) and is our preferred Superior Eave Detail. This exact same premium technique is utilized when upgrading to our full self-adhered butyl systems, including Flash Deck® Shingle Base and Flash Deck® Metal Base.
By implementing this Superior tier now, you integrate elite building science into your synthetic workflow today while perfectly positioning your crews for full self-adhered upgrades tomorrow. Whether you are running a complete self-adhered system or bridging the perimeter with a traditional synthetic field underlayment, the physics of the edge do not change. By standardizing this 9-inch detail on every job, your crews master a single, universal workflow that provides elite protection, regardless of the field underlayment specified.
The Edge-First Technique: Step-by-Step
The Flash Deck Strip-In method is installed at the roof perimeter prior to any drip edges being fastened to the deck. It establishes a monolithic, self-sealing barrier at the absolute most vulnerable details of the entire structure.
- Prepare the Substrate: Eaves and Rakes. Ensure the roof deck and fascia board are clean, dry, and entirely free of debris, sawdust, or protruding fasteners.
- Apply Strip-In to the Deck: Prior to Drip Edge. Unroll the nine-inch Flash Deck Strip-In along the horizontal eave or vertical rake. Adhere the membrane directly to the raw wood decking, aligning it parallel with the deck edge.
- Extend onto the Fascia or Rake: The Over-the-Edge Seal. Extend the membrane over the roof perimeter and down onto the face of the fascia or rake trim. This creates a continuous, unbroken gasket over the critical sub-fascia and deck junction.
- Verify Clearance: Crucial Aesthetic Check. Ensure that the extended portion of the Flash Deck Strip-In on the fascia does not extend past the visible, bottom "kick" of your metal drip edge. The metal profile must completely conceal the membrane for a clean, professional finish.