Stormtite is IKO’s economical synthetic underlayment choice. Stronger than conventional organic felts, Stormtite installs easily, even in cool weather, due to its light weight. Stormtite is the perfect combination of strength and flexibility. Stronger than felt. Stormtite® is more resistant to tearing and shredding when installers walk on it. Plus it’s coated top and bottom with tough polyolefin for superior weather-resistance with a slip-resistant surface. Stormtite® effectively sheds water that gets behind shingles and it’s engineered to be a vapor-retarder. Thanks to built-in UV stabilizers, it can be left exposed for up to 30 days and will continue to perform. A single roll of Stormtite® contains 1000 square feet but weighs only 20 to 26 lb. It’s easier for your installers to handle.