<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause xmlns:xt="urn:xpressauthor:trackchanges" id="_2abcf606-664b-462e-9aee-6dd9b975c358" outputclass="ncc-clause"><meta><facet building="Class 1a"/><facet building="Class 1b"/><facet building="Class 4"/><facet building="Class 5"/><facet building="Class 6"/><facet building="Class 7a"/><facet building="Class 7b"/><facet building="Class 8"/><facet building="Class 9a"/><facet building="Class 9b"/><facet building="Class 10a"/><facet building="Class 10b"/><facet building="Class 10c"/></meta><sptc>F7D4</sptc><title id="_2656e6ef-82a1-4c2f-afe9-9f9cfabdaca6">Determination of impact sound insulation ratings</title><archive-num>2019: F5.3</archive-num><subclause id="_89076bc1-b9aa-4798-85f5-a771e655670b" outputclass="subclause"><title id="_09649b12-0789-4a08-a5a7-26565125eb62">SubClause</title><num>1</num><p>A floor in a building <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_af6fde9f-147d-4782-8b85-42044e80fd42" id="_565848ae-07dc-4f14-abdd-a891d98535ab" scope="local" type="abcb-glossentry">required</xref> to have an impact sound insulation rating must—</p><ol outputclass="alpha"><li id="_17e59806-df2f-4431-a6c5-89058047b707">have the <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_af6fde9f-147d-4782-8b85-42044e80fd42" id="_a9eaba0d-ebf8-421a-a490-8781f3e51db4" scope="local" type="abcb-glossentry">required</xref> value for weighted normalised impact sound pressure level (L<sub id="_6da4a110-7779-4f1f-81fd-4959929cbdaf">n,</sub><sub id="_c0105ce1-fb28-41e4-8e6e-1c40368f425f">w</sub>) determined in accordance with AS ISO 717.2 using results from laboratory measurements; or</li><li id="_4ee01934-2ba0-4ddb-84da-ed864e377ffa">comply with <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/193_0.7.0.xml#_eff72f84-ae5b-441f-a9f1-596ca32a1ab9" id="_544d151d-ed8e-4674-b9ec-cc3f754d320b" scope="local" type="specification">Specification 28</xref>.</li></ol></subclause><subclause id="_f453cdcf-cc9e-4b50-b200-fa8d828be956" outputclass="subclause"><title id="_ed18944d-82da-402d-b5df-749b9a3ee4b2">SubClause</title><num>2</num><p>A wall in a building <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_af6fde9f-147d-4782-8b85-42044e80fd42" id="_f708591b-2456-47f0-b779-d47c5d064e68" scope="local" type="abcb-glossentry">required</xref> to have an impact sound insulation rating must—</p><ol outputclass="alpha"><li id="_09de57d0-0b21-4ec9-86f7-616cf09b4ed7">for a Class 2 or 3 building be of discontinuous construction and</li><li id="_8fe52c1f-a4be-4b45-875e-ddf30191be0f">for a Class 9c building, must—<ol><li>for other than masonry, be two or more separate leaves without rigid mechanical connection except at the periphery; or</li><li>be identical with a prototype that is no less resistant to the transmission of impact sound when tested in accordance with <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/194_0.3.0.xml#_b4e8c26f-102e-4c43-8c92-08da2303c420" id="_9711a919-f1c1-42bb-87a7-428c2e1d686f" scope="local" type="specification">Specification 29</xref> than a wall listed in <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/781_6.6.0.xml#_aeae7bd4-e510-4504-81e9-a76460866dbc" id="_c1dee742-3608-499e-8637-cb03a88c8f15" scope="local" type="clause">S28C4</xref> to <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/794_0.19.0.xml#_f653a810-9240-4a7e-b0f2-98653967288f" id="_6342afb8-1449-45c6-b3de-6984d9d4b368" scope="local" type="clause">S28C7</xref>.</li></ol></li></ol></subclause><subclause id="_de21feb9-6ae1-4f41-9488-a9a44a8e0043" outputclass="subclause"><title id="_211ceb5d-9655-4614-b730-6b15322f782d">SubClause</title><num>3</num><p>For the purposes of this Part, discontinuous construction means a wall having a minimum 20 mm cavity between 2 separate leaves, and—</p><ol outputclass="alpha"><li id="_e0ba4133-f941-4c19-8b1d-507a4053f51e">for masonry, where wall ties are required to connect leaves, the ties are of the resilient type; and</li><li id="_edb2ffc7-f3e3-434d-a5e9-3baec40dee13">for other than masonry, there is no mechanical linkage between leaves except at the periphery.</li></ol></subclause></clause>