Epilay
Synthetic Roofing Underlayment.
The protective layer beneath the finished roof — selected to match the structure, exposure, and roofing system on each project.
The Foundation
A critical layer beneath every roof.
Protect your investment from the underlayment up. Epilay is a 100% synthetic roofing underlayment built from advanced engineering and unique features that make it our most recommended deck protection.
Exceptionally light-weight with superior tear strength — a 10-square roll at 7 MIL thickness weighs only 23 lbs — Epilay can water-tight your roof for up to 6 months, giving you a generous window between dry-in and the finished roofing system going on.
Tougher than felt. Faster to handle. Built to last between trades.
Why It Matters
Built to protect the deck before the finish goes on.
Synthetic Protection
Modern underlayments resist moisture, tearing and jobsite wear better than traditional felt on demanding projects.
High Tear Strength
Designed to handle foot traffic, wind exposure, and fastening without breaking down during installation.
UV Stability
Helps protect the roof deck if final roofing installation is phased or delayed during construction.
Walkable Surface
Textured surfaces improve installer footing and make work on the roof safer and more controlled.
Lightweight Coverage
Large rolls cover significant roof area efficiently, reducing handling time compared with heavier felt products.
Roof-System Compatibility
Suitable beneath metal, stone-coated, and other sloped roofing systems when matched to the project requirements.
System Options
Specified to the roof.
Synthetic underlayment
High-strength synthetic sheets offer strong tear resistance and dependable deck coverage in demanding conditions.
Project-specific selections
We specify the right underlayment based on roof design, exposure, final roofing type, and site conditions — not one brand for every job.
Specifications
The essentials.
- Application
- Sloped residential & commercial roofs
- Formats
- Synthetic roofing underlayment
- Function
- Secondary water-shedding layer over the roof deck
- Surface
- Walkable textured finish
- Performance
- High tear resistance and temporary weather protection
- Selection
- Specified by roof type, geometry, and site exposure
Project Gallery
Underlayment on active projects.
