National Applied Construction (NAC) Products has updated the name of its Super SAM sound control membrane to Super SAM 125 after erroneously listing it on literature and data sheets as 110-mil thick when “actual thickness of the product has been 125 mil (3.2 mm),” the company says. The low-profile membrane retains its IIC rating of 51db on a bare 8-inch concrete slab with no ceiling assembly, and an STC rating of 55 db on a bare 6-inch concrete slab.