Cot PEHD Rainplus 90/88° Cot PEHD Rainplus 90/88° is a polyethylene high-density (PEHD) waterproofing membrane designed for use in roofing, wall, and flooring applications. The membrane is composed of two layers of PEHD and is designed to provide a waterproof barrier against moisture and weathering. The membrane has a 90° and 88° reinforcement angle which increases its strength and durability. The membrane also features a built-in thermal insulation layer that helps reduce energy costs and provides additional protection against the elements. The membrane is suitable for use in both residential and commercial applications.