York-Seal Installation Instructions

40 mil Self-Adhering Flashing Membrane

Surface Protection:

• Concrete shall be in place for 7 days minimum. The substrate must be completely dry. The surface shall have a smooth finish free of voids, sharp protrusions, form release agents, and be clean, dry, and smooth. Block or brick walls shall have mortar joints struck flush and York-Seal should not span a gap greater than 1/4".

Primer:

• Surfaces to receive York-Seal must be clean and dry. For best results, substrates must be primed. Apply primer by spray, brush, or with a long nap roller. At 75º, allow the primer to dry for 1 hour minimum. Prime only areas to be waterproofed the same day, reprime if areas become dirty or wet.

Application:

• Precut York-Seal into manageable lengths. Remove the siliconized release liner and position the membrane carefully before pressing it into place. Self-adhering membranes must be rolled with a suitable hard roller to ensure the entire membrane is pressed firmly into the substrate, taking care to avoid air pockets and wrinkles. Overlap adjoining pieces 2 inches and seal the edge with a mastic. Cut the bottom edge back 1 inch from the exterior surface of the building and place it on top of the drip edge.
• Reinforcing strips on all inside and outside corners as well as mechanically fastening to the door and window frames is strongly recommended for air barrier installations.

Terminations:

• Press terminated edges firmly in place. The use of a surface-mounted termination bar is recommended for vertical terminations. Horizontal terminations at end dams require a minimum 2-inch turn up of the membrane to form a tray and/or use preformed end dams from the factory. Apply an approved sealant to all termination edges, laps, cuts, and penetrations.

Safety, Storage, and Handling:

Pallets of membrane shall not be double stacked on the job site. Provide cover on top and sides, allowing for adequate ventilation. Avoid prolonged and repeated contact with the skin. Consult the Material Safety Data Sheet for the best available information on safe handling, storage, personal protection, health, and environmental considerations.

Limitations:

• Not recommended in areas where the membrane will be subject to temperatures above 180ºF.
• Do not apply the membrane to a substrate that has absorbed water. Should be installed when air and surface temperatures are above 40ºF.
• Do not apply primer or membrane to damp or contaminated surfaces.
• Do not span a gap 1/4" or greater.
• Not recommended for use with sealants containing coal tar or polysulfides.
• UV Exposure: 60 days.
• Avoid using with products that have high levels of plasticizers.