York 304 SA is a self-adhering stainless steel flashing and transition membrane manufactured from a flexible 2-mil sheet of Type 304 stainless steel, a butyl adhesive, and a siliconized release liner. It provides exceptional puncture and tear resistance while remaining flexible enough to cut, fold, and form by hand.

The self-adhering butyl backing creates a watertight bond without requiring a primer. Its exposed stainless steel surface provides a reliable bonding surface for compatible sealants, air barriers, roofing membranes, and waterproofing systems. York 304 SA can be used as through-wall flashing or to connect critical transitions throughout the building envelope.

Key Features

• Self-adhering Type 304 stainless steel membrane
• Best-in-class puncture and tear resistance
• Watertight butyl adhesive
• No primer required
• Flexible and easy to cut and form by hand
• Bare stainless steel surface provides reliable sealant adhesion
• Suitable for application temperatures from 20°F to 170°F
• Remains stable and airtight from -70°F to 250°F
• Class A fire-resistant material
• Mold resistant
• Passes AAMA 711-20
• 20-year manufacturer warranty
• Custom sizes available upon request

Common Applications

• Through-wall flashing
• Air-barrier transition membrane
• Roof-to-wall transition membrane
• Below-grade waterproofing transition membrane
• Parapet transition membrane
• Window and door sill pans
• Jamb and fenestration flashing
• Deck-ledger flashing
• Flashing and air-barrier repairs
• Lap and transition tape

Compatible Materials and Systems

• Air barriers
• Roofing membranes
• Below-grade waterproofing systems
• Spray polyurethane foam
• Insulation boards
• Construction sealants
• OSB
• Exterior gypsum
• Plywood
• Concrete
• Metal substrates