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The thickness of the sprayed fireresistant material applied to structural members shall be determined in accordance with ASTM E 605. Thickness testing shall be performed on not less than 25 percent of the structural members on each floor.
1705.14.4.5.1 Beams and Girders
At beams and girders thickness measurements shall be made at nine locations around the beam or girder at each end of one 12-inch (304.8 mm) length.
1705.14.4.5.2 Joists and Trusses
At joists and trusses, thickness measurements shall be made at seven locations around the joist or truss at each end of one 12-inch (304.8 mm) length.
1705.14.4.5.3 Wide-Flanged Columns
At wide-flanged columns, thickness measurements shall be made at 12 locations around the column at each end of one 12-inch (304.8 mm) length.
1705.14.4.5.4 Hollow Structural Section and Pipe Columns
At hollow structural section and pipe columns, thickness measurements shall be made at not fewer than four locations around the column at each end of one 12-inch (304.8 mm) length.

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