Solving your more complex transitions in the wall assembly

York 304 SA is now considered the best self-adhering through-wall flashing. The flexible 2 mil sheet of Type 304 stainless steel is compatible with all neighboring materials and the 10 mils of butyl adhesive provides superior adhesion outperforming traditional peel and stick.
York 304 SA is a self-adhering metal flashing that offers best in class puncture and tear resistance.  It can be applied from 20°F to 170°F and stays stable and air tight from -70°F to 250°F.


  • Available in Type 304 (standard) & Type 316 for more corrosive/coastal areas
  • Bare stainless steel surface for sealants to adhere to
  • Best in class puncture and tear resistance
  • Butyl adhesive/watertight bond
  • No primer required
  • Flexible, easy to cut and form by hand
  • UV resistant
  • 20 year warranty
  • Fire resistant: ASTM E84 Class A material
  • Mold resistant: passes ASTM D3273
  • Passes AAMA 711-20
  • Passes air barrier material test: ASTM E2178-13
  • Excellent bond to a variety of substrates like OSB, exterior gypsum, plywood, concrete, metals and air barrier materials
  • Contributes towards LEED by satisfying EA Credit 1 (optimize energy performance) and EQ Credit 4.1 (low emitting materials)


  • Through-wall flashing
  • Transition membrane (air barriers, roofing, waterproofing)
  • Window & door sill pan flashing
  • Jamb closer flashing
  • Repair tape for flashing, air barriers, etc.
  • Roof to parapet flashing
  • Lap tape for through-wall flashing
  • Deck ledger flashing

Compatible with:

  • Air barriers
  • Spray polyurethane foam
  • Insulation boards
  • Below grade waterproofing
  • Roofing membranes
  • Construction sealants

Available in Sizes

Type 304 & Type 316
4”, 6”, 9”, 12”, 18”, 24”, 36” x 50′
4”, 6”, 9”, 12” x 20′
*Custom sizes upon request

Contact us for a free specification review