is provided for forming a relatively thick lightweight nonwoven insulating mat the method includes the steps of forming a relatively thin relatively dense first outer layer by needle punching a first batt of glass fibers and forming a relatively thin relatively dense second outer layer by needle punching a second batt of glass fibers a relatively thicker relatively less dense intermediate batt of glass fibers is fed between the first and second layers thereafter the first layer intermediate batt and second layer are needle punched together to form a multi layer mat having a first layer middle layer and second layer application_number US 41476806 A description referring to the figures in general the present invention is directed to a method for producing a multi layer nonwoven insulating mat of fiberglass fibers and to an insulating mat so formed u201c needle punching u201d refers to the process of converting batts or webs of loose fibers into a coherent fabric referred to as a nonwoven fabric on a needle loom needle punched nonwovens are created by mechanically orienting and interlocking the fibers of a batt as those terms are known in the art the mechanical interlocking is achieved with a large number of barbed felting needles that repeatedly punch through a loose batt the generic needle punch loom comprises at least one needle board that is held in place by a needle beam feed rollers and exit rollers.