The instant invention relates to a process for coating the back of textile floor coverings, e.g. carpets, with polyurethane foams wherein it is possible to obtain particularly firm fixing of the nap and improved anchorage of the textile filaments. The process broadly comprises:A. applying to the back of a textile floor covering a first coat consisting essentially of a reacting foamable mixture of a polyol and a large excess of polyisocyanate,B. before said first coat has been hardened, applying thereto reacting foamable mixture of substantially equivalent quantities of polyol and polyisocyanate, andC. thereafter hardening the resultant product.