QuietWalk Sound Absorption and Vapor Barrier 100 sq ft Premium 3 mm Flooring Underlayment A19 Bulbs 74 Manufacturer Warranty N A Kitchen Carts 74 Manufacturer Warranty N A They are partially threaded to provide stronger clamping with less shear movement Feet) 100 UNSPSC 30161700 For Use with Hardwood No IIC Rating 71 75 STC Rating More than STC 50 Length (Feet) 33 floating bamboo and luxury vinyl plank (5mm and thicker) underlayment is for floating floor applications (flooring that required no glue or nail down) will not work with nail staple or glue down applications Superior sound reduction recycled fibers absorbs sound and keep it from traveling to other rooms