<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause id="_225aadf6-0b6f-40ea-ab5f-80c2e150cc6d" outputclass="ncc-clause"><sptc>S2C17</sptc><title id="_d7279d7f-0d13-4d0f-8d60-fe52d5f2c83a">Gypsum-perlite or gypsum-vermiculite plaster or metal lath — columns</title><archive-num>2019: Sch. 5 (Annex): 7.2</archive-num><subclause id="_8cf7b018-22cb-46d0-8271-b9d26b96f781" outputclass="subclause"><title id="_850ddf30-1320-4508-bab1-293ad98dd426">SubClause</title><num>1</num><p>For the fire protection of steel columns with gypsum-perlite or gypsum-vermiculite on metal lath—</p><ol outputclass="alpha"><li id="_cfd1b00d-afe3-4702-b5af-b6a49a025e8f">the lath must be fixed at not more than 600 mm centres vertically to steel furring channels, and—<ol><li>if the plaster is to be 35 mm thick or more — at least 12 mm clear of the column; or</li><li>if the plaster is to be less than 35 mm thick — at least 6 mm clear of the column; or</li></ol></li><li id="_70206ddd-f821-43cf-b0ef-009d0d3ec36d">the plaster may be applied to self-furring lath with furring dimples to hold it not less than 10 mm clear of the column.</li></ol></subclause><subclause id="_a894bc8f-57a4-4de0-b9c9-3f04267e44c0" outputclass="subclause"><title id="_e3a05834-78f4-44d0-b715-76a74e9a65ff">SubClause</title><num>2</num><p>For the purposes of (1), the thickness of the plaster must be measured from the back of the lath.</p></subclause></clause>