Products / IKO Stormtite Synthetic Underlayment

Stormtite is IKO's non-breathable synthetic steep-slope underlayment for use under asphalt shingles, sold as a lighter, tear-resistant alternative to No. 15 asphalt-saturated felt and part of IKO's PROFORMAX accessory system. The October 2025 data sheet gives a 48 in. x 250 ft. roll (1,000 sq. ft.) with a 4 in. lap line, calls for 4 in. side and 6 in. end laps fastened with nails or staples carrying 1 in. plastic or metal caps, and lists an ASTM E108 Class A fire test result.