This sound barrier underlayment reduces impact vibrations in residential and commercial spaces. dB4 Lite is a flexible and environmentally safe acoustic barrier that can be installed directly under finished floors including hardwoods, carpets and laminate finished flooring. dB4 Lite is designed with resilient polyester fibers to reduce impact vibrations, and a 7-layer moisture blocking polyethylene film to protect finished floors. The combination of the two materials significantly reduces impact vibrations and footfall. This noise control underlayment received a high IIC rating, ensuring a soundproof floor. Designed with polyester, dB4 Lite does not contain any harmful chemicals, is environmentally friendly and can be 100% recycled after use. This acoustic floor underlayment is puncture resistant, lightweight, easy to install and acts as a vapor barrier. dB4 Lite bonds easily to the subfloor, and should be installed with the fiber side facing down regardless of the flooring type.