The first layer on top of the plywood or OSB roof deck is underlayment. For this, we chose a self-healing ice-and-water membrane to protect the shallow-pitched roof deck. The tricky part in laying ...

OSB, etc. Seals roof tears, seams, flashings, copings, skylights, gutters, and much more. This tape is made to withstand all weather and will flex, expand and contract in all conditions.