Ram Board seam tape is designed to hold Ram Board seams together. Its 3 in width gives more of an allowance to cover Ram Board seams. The seam tape's kraft backing makes it easy to tear off and apply. Because of its contractor grade adhesive, Ram Board seam tape should not be taped directly to finished floors and surfaces. Like most tape, Ram Board tape is not vapor permeable and should be avoided in areas where curing floors need to breathe.