The Acousti-Mat® Perimeter Isolation Strip is as an edge border used with Acousti-Mat® Floor Underlayment in order to prevent structural sound transmission to side walls. The product is extremely flexible, lightweight, easy to install and handle. The material is sold by the roll, 2.5" wide x 110" in length and 1/8" thick. The Perimeter Isolation Strip is packaged on a roll for long placement runs and limited cutting. The Acousti-Mat® Perimeter Isolation Strip should be installed at the perimeter of all areas receiving the Acousti-Mat® Floor Underlayment. It should also go around any protrusions in the flooring. This procedure isolates the sound mat floor system from other material. This isolation creates an acoustical break that minimizes the transmission of sound laterally from the “floating floor” to any other construction assembly. Adhere the foam perimeter isolation strip to the wall or staple as close as possible to the top of the foam strip, above the height of the poured floor.