This standard specifies a method for assessing the burning behaviour, spread of flame and the smoke development of horizontally mounted floor covering systems exposed to a radiant heat gradient in a test chamber, when ignited with a pilot flame. This method is applicable to all types of floor coverings such as textile carpet, cork, wood, rubber and plastic coverings as well as coatings. Results obtained by this method reflect the performance of the total floor covering system as tested. Modifications of the backing, bonding to a substrate, underlay, or other changes of the system may affect test results.