Passive fireproofing contains structure fires before the flames can spread. Spray-on intumescents, a type of passive fireproofing, coats roofs, floors, beams and columns. An application of fireproof spray prevents structural collapse by extending the time a building can stand during the heat of a fire. Read more: http://www.sprayonfoam.com/passive-fireproofing#ixzz4DfQiVJH5