What technical requirements define peel and stick modified bitumen installation for asphalt or bitumen modification?

Peel and stick modified bitumen (self adhering SBS or APP sheets) is defined more by substrate conditions and detailing rules than by the asphalt itself. Because they lack a liquid, hot-applied layer to fill surface irregularities, meticulous detailing at overlaps, T-joints, and penetrations is crucial for waterproofing success.