This Tyvek Butyl Tape is a versatile and reliable solution for various insulation needs. With a thickness of 2mm and a length of 30 metres, it is suitable for use on windows, interior walls, acoustic insulation, pipes, and attic/loft spaces. The tape is made of butyl putty material and is black in colour, weighing 1.2kg and measuring 20mm in width. Used for forming an airtight seal between breather/construction membranes. The tape is mould and mildew resistant, double-sided, water-resistant, and synthetic composed pliable rubber non-hardening. It comes in a roll packaging and is sold as a unit quantity of 1. This membrane sealer is perfect for those in need of insulation and accessory materials for their building projects.