As of January 1st phosophorescent marking in stairwells and exit paths is required by the NFPA 101 code. As a result of studies of the World Trade Center, several states and municipalities had already required this type of marking, but it is now required by NFPA code.
A white paper is available that discusses phosphorescent marking and the NFPA 101 requirements, as well as local and state requirements. This white paper is available free. Just fill out and
submit the form below. Your copy of "Introduction to Photoluminescent Labels, Signs, and Path Markings" will then be emailed to you.