Super SAM 125 sound control membrane is the only self-adhering, sheet applied, modified bitumen product that is an all-in-one crack isolation, waterproofing, moisture vapor barrier & sound control membrane with a delta rating of 18, the company says. With a thickness of only 125 mil (3.2 mm), Super SAM 125 is the perfect low-profile solution for condo, apartment, residential and commercial applications, according to the company.