<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause id="_fa93e6d8-a3e3-4831-94dd-9c5db3fb62d6" outputclass="ncc-clause"><sptc>S2C27</sptc><title id="_3de9a4cf-376d-4075-978c-c4cdaa71a8c1">Measurement of thickness of column and beam protection</title><archive-num>2019: Sch. 5 (Annex): 12.1</archive-num><subclause id="_8b86cda0-acae-40aa-98d9-b632fca3d87c" outputclass="subclause"><title id="_98d1514e-aa5c-4b8a-b9b1-a2f5dd2dc00b">SubClause</title><num>1</num><p>The thickness of the fire protection to steel columns and steel beams (other than fire protection of gypsum-perlite or gypsum-vermiculite plaster sprayed on metal lath or sprayed to contour) is to be measured from the face or edge of the steel, from the face of a splice plate or from the outer part of a rivet or bolt, whichever is the closest to the outside of the fire-protective construction, except that—</p><ol outputclass="alpha"><li id="_b7fa2025-1d10-4305-88f0-12eca3ce8739">if the thickness of the fire protection is 40 mm or more, rivet heads may be disregarded; and</li><li id="_fa0b80ee-2f1b-4b56-9949-8b13e341bd9a">if the thickness of the fire protection is 50 mm or more—<ol><li>any part of a bolt (other than a high-tensile bolt) may be disregarded; and</li><li>a column splice plate within 900 mm of the floor may encroach upon the fire protection by up to a ¼ of the thickness of the fire protection; and</li></ol></li><li id="_ad0c6d33-65ba-43a8-82ba-6d7e63bf6429">the flange of a column or beam may encroach by up to 12 mm upon the thickness of the fire protection at right angles to the web if—<ol><li>the column or beam is intended to have an FRL of 240/240/240 or 240/–/–; and</li><li>the flange projects 65 mm or more from the web; and</li><li>the thickness of the edge of the flange (inclusive of any splice plate) is not more than 40 mm.</li></ol></li></ol></subclause></clause>