Abstract: Disclosed are plastic compositions for a carpet backing having from about 5 to about 25% by weight PVC resin, from about 5 to about 25% by weight plasticizer, and from about 50 to about 90% by weight filler. In a preferred embodiment, the plastic composition is about 15% by weight Geon-138, about 15% by weight di-isononyl phthalate, and about 70% by weight fly ash. Also disclosed are methods for forming backings for floorcoverings using the disclosed plastic compositions. In preferred embodiments, a plastic composition is applied through a slot-die directly to the underside of a carpet or alternatively onto a conveyor belt on top of which the carpet or floorcovering may be subsequently positioned.