Method of attaching insulation to molded automotive floors

A method for securing an underpad to automotive and trunk coverings to form a composite comprising:

• molding first thermoplastic fastening means to the underside of a thermoplastic backing layer that secures a fiber face layer, said layers forming a carpet composite;
• contacting said thermoplastic backing layer with an underpad having substantially the same dimensions as said composite;
• having an upper surface and a lower surface;
• and having openings therethrough from said top surface to said lower surface;
• positioning said composite and said underpad so that a portion of said opening at said upper surface of said underpad has a diameter sufficient to receive and contain said first thermoplastic fastening means;
• inserting a second thermoplastic fastening means comprising a head and a shaft into said first thermoplastic fastening means through the lower surface of said opening, a portion of said opening at the lower surface having a diameter sufficient to receive and contain said head of said second thermoplastic fastening means, and a narrower diameter sufficient to allow said shaft to pass through and be received in locked engagement with said first thermoplastic fastening means, thereby securing said composite to said underpad.