Elevate UltraPly™ TPO T-Joint Covers are square pieces with rounded corners of non-reinforced membrane made of flexible thermoplastic polyolefin. They are designed to cover and seal all T-joints formed at seam intersections of UltraPly TPO membranes that exceed 1.2 mm in thickness and at seam angle changes. They can also be used to repair small punctures of the field membrane.