BT20XL Butyl is a cold applied self-adhering membrane composed of a tough cross laminated high density polyethylene film coated on one side with a layer of our proprietary butyl adhesive.

Features

• A 20 mil butyl self-adhering membrane
• Seals joints in exterior sheathing
• Self-adhered flashing to seal window and door nailing flanges
• 120 day UV exposure rating
• Safe for use on all wood, wood clad, aluminum, fiberglass and vinyl windows and doors, and PVC membranes
• Safe for use on all window and door flanges/nailing fins
• Recommended for high altitude, high temperature and/or highly conductive metal cladding/flashing (copper, Cor-Ten, zinc) applications
• Compatible with most construction sealants and will adhere to most construction surfaces
• IAPMO ER 362 certified
• Complies with ASTM E2112 requirements