Waterproofing. United States Government master specification for integral waterproofing material, water-repellent type (for use with Portland cement mortar or concrete), Federal Specifications Board Specification 444, officially promulgated by Federal Specifications Board, Oct. 28, 1926, for use of Departments and independent establishments of Government in purchase of integral waterproofing material, water-repellent type (for use with Portland cement mortar or concrete).