Butyl tape was originally created and used for roofing. It protects from the outdoor elements and is fantastic for repairs. It seals seams and binds cracks and holes that are small in diameter and just on the surface of the roof and its shingles.
For the best results from butyl tape, put it down on grit-free roofs that have a smooth surface. Clean the roof thoroughly with a pressure washer or a good solution of detergent and water by hand before applying the sticky layer of tape.
Butyl tape may be a lifesaver, but it has its limits. Only use it on small areas. If you apply butyl tape over large areas as a patch, it may not hold up to the harsh weather conditions that a roof is designed to endure.