Layering 2 : (1) Stratification, as of smoke. (2) The partial separation of a 1 to 2 in. layer of concrete from a heavy concrete structural assembly because of severe fire exposure
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}