A medium density, Portland cement based, cementitious fireproofing that is mixed with clean, potable water onsite before application and spray applied to the substrate. It provides 1-4 hour fire protection for structural steel members and upgrades the fire resistance of existing concrete. It can also be used as a thermal barrier over polyurethane foam. Recommended areas of application include pharmaceutical facilities, pulp and paper mills, nuclear and conventional power plants, factories, warehouses, stadiums, institutional and biomedical facilities and acoustical applications.