In fact , as far as I have revised, certain materials with low levels of combustion may be considered non combustible material, as specified in the North Carolina State Code, consideration which I will like to know if it is registered specifically in the NFPA 5000 or NFPA 101 codes or some other place within the NFPA Norms.
For example ,in the United Kingdom: "a staircase that is enclosed throughout its height by a fire resisting structure and doors , can sometimes be considered a place of comparative safety. In these cases the staircase can be known as a protected route." In addition , "composite materials may be considered non combustible if the material has a structural base of non combustible material, the combustible surfacing is not more than 0.125" thick, and the surfacing has a flame spread less than 50 when tested in accordance with ASTM E84 "
Many rules and construction codes of different countries specify that whenever or wherever the codes are not specific regarding fire hazard, the NFPA codes will be mandatory on that concern.
Appreciating any comments to my uncertainty, I remain
-- Fire Safety Advice Center ( http://www.firesafe.org.uk )
-- NCDOI OSFM Evaluation Services, DOI File #WP61-11, Ed. Date 09/08/11 , Rev 1 : 12/05/11