York Seal 40-Mil Self-Adhering Flashing – 75' Rolls
Ships in 3–5 business days
York-Seal is a 40-mil self-adhering composite flashing membrane designed to limit air, moisture, vapor, and water transmission through masonry walls and building-envelope transitions. It combines a proprietary modified-asphalt adhesive with a durable, cross-laminated high-density polyethylene facer.
The membrane provides strong adhesion, low-temperature flexibility, and resistance to tearing and physical damage. York-Seal is fully bonded to the substrate and can be used for through-wall flashing, construction joints, and window and door transitions.
Key Features
- 40-mil self-adhering composite membrane
- Waterproof and impermeable to moisture
- Limits air, vapor, and water transmission
- Fully bonded to the substrate
- Cross-laminated polyethylene facer provides tear resistance
- Strong low-temperature adhesion and flexibility
- High-temperature stability
- Siliconized release liner for application
- Suitable for through-wall flashing
- Sold in full-box quantities only
Common Applications
- Through-wall flashing
- Masonry walls
- Construction joints
- Window and door flashing
- Air-barrier transitions
- End dams and flashing terminations
Compatible Substrates
- Plywood
- Lumber
- Precast concrete
- Concrete
- Concrete block
- Metal
- Exterior gypsum sheathing
- Brick and masonry with flush mortar joints