<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause xmlns:xt="urn:xpressauthor:trackchanges" id="_d18cf30a-2e9c-49c4-a91f-67aa0a781c73" outputclass="ncc-clause"><meta><facet building="Class 2"/><facet building="Class 3"/><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 9c"/><facet building="Class 10b"/><facet building="Class 10c"/></meta><sptc>10.7.2</sptc><title id="_1a41ffde-2712-44d6-aec6-6cfdd94b79bf">Determination of airborne sound insulation ratings</title><archive-num>2019: 3.8.6.3</archive-num><subclause id="_848dbaa1-90c4-4325-9dfa-23dd1dd92417" outputclass="subclause"><title id="_1bc12f4a-c381-4f3c-939a-cfccac2f3b53">SubClause</title><num>1</num><p>The Rw + Ctr sound insulation rating <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1432_4.0.0.xml#_af6fde9f-147d-4782-8b85-42044e80fd42" id="_e820260d-941a-40ff-8c6b-d19fd66d5d13" scope="local" type="abcb-glossentry">required</xref> by <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1997_1.5.0.xml#_4799edf5-6cdd-434b-af44-c3535fd3e1e2" id="_acae4f35-b22e-4176-b80e-7b4eae6f93f0" scope="local" type="subclause">10.7.1(1)(a)</xref> must—</p><ol outputclass="alpha"><li id="_8d00c835-00f0-4905-9b0b-08cec52de161">be determined in accordance with AS<xt:delText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-09-09T11:54:00" xt:id="fe2076ee-c9c2-4db9-8789-98d58fe03fe6"/>/NZS<xt:delText xt:action="end" xt:id="fe2076ee-c9c2-4db9-8789-98d58fe03fe6"/> ISO 717.1, using results from laboratory measurements; or</li><li id="_5ae5c42c-cdcb-46db-b1cb-03bccd7218ac">comply with <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/2002_1.5.0.xml#_8fa0e329-e721-44f1-a4de-0b6cc6d152f3" id="_10990418-c777-4922-834b-324ea0b50745" scope="local" type="clause">10.7.5</xref> to <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/2036_0.11.0.xml#_98d8a2f5-3c2d-4fa2-b226-bab2637fc1fb" id="_4e7f474f-9b88-46c4-b00a-16eab191b6cc" scope="local" type="clause">10.7.8</xref> and the relevant provisions of <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/2000_1.4.0.xml#_3e498635-5ada-4f89-a0b1-331d4821e5fc" id="_7e3dab69-5ac8-4de0-a5ea-c060a3c62a9b" scope="local" type="clause">10.7.3</xref>.</li></ol></subclause><callout id="_0e1c38d4-4bf9-4763-982b-5d7aa712c11a"><callout-type ncc-info-type="info"/><p>R<sub id="_b684118b-eb88-416c-8b9c-796ef12b71dc">w</sub> is a measure of airborne sound insulation. C<sub id="_06207496-bc8c-4939-944a-294a301a42c8">tr</sub> is a spectrum adjustment factor that adjusts for low frequency sound levels. C<sub id="_1e4cee71-27ab-4c2b-8df5-5c67b7805753">tr</sub> has been chosen in recognition of the problems caused by the high bass frequency outputs of modern home theatre systems and music reproduction equipment used by occupants of Class 1 buildings.</p><p>The wall configurations described in <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/2002_1.5.0.xml#_8fa0e329-e721-44f1-a4de-0b6cc6d152f3" id="_2b1dca5e-fe0f-49e8-8b36-c102d463a597" scope="local" type="clause">10.7.5</xref> to <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/2036_0.11.0.xml#_98d8a2f5-3c2d-4fa2-b226-bab2637fc1fb" id="_bdafea91-abf3-4eba-8e26-abf3687ea450" scope="local" type="clause">10.7.8</xref> are typical examples. Other proprietary methods are available via testing to AS<xt:delText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-09-09T11:55:00" xt:id="cc2ddd0f-7589-4ca6-9a6b-cff73fdd1342"/>/NZS<xt:delText xt:action="end" xt:id="cc2ddd0f-7589-4ca6-9a6b-cff73fdd1342"/> ISO 717.1 for meeting the R<sub id="_94594f0f-6208-409c-871e-9716c2642b3b">w</sub> + C<sub id="_ebff4c59-84ed-49c6-874b-d3488e70fd56">tr</sub> requirements of <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1997_1.5.0.xml#_776c640b-caa2-4216-b04b-7887705ea812" id="_771799f0-a62e-4472-ab01-17ced4c63903" scope="local" type="clause">10.7.1</xref>.</p></callout></clause>