Seam Tape used for taping Protect Board, BuilderBoard, Eco Board, Ramboard, FloorWrap, Polykraft, or Kraft paper in place. Its 3″ width gives more of an allowance to cover seams. The kraft backing makes it easy to tear off and install as well as makes it recyclable. Because of its contractor grade adhesive, it should not be taped directly to finished floors and surfaces. Like most tape it is not vapor permeable and should be avoided in areas where curing floors need to breathe.