<?xml version="1.0" encoding="UTF-8" standalone="no"?><image-reference xmlns:xt="urn:xpressauthor:trackchanges" id="_c297cf76-4972-46ff-9912-5ab0cdd6b3c7" variation="NT"><num>10.7.1b</num><title id="_0187e707-f0fe-46e7-83e3-e6480757bc91">Construction of walls to reduce impact sound and achieve a 50 R<sub id="_a27dec36-8fa7-427a-87c0-8227a3da7032">W</sub>: cavity brickwork</title><image alt="Construction of walls to reduce impact sound and achieve a 50 RW: cavity brickwork." href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/10-7-1b-construction-of-walls-50-rw-cavity-brickwork-NT.svg"/><desc-note id="_642e0287-68ae-4bf3-96d6-22c4ab5e5655"><p>2 leaves of 90 mm brick masonry with—</p><ol outputclass="alpha"><li id="_03ca094d-d481-4dc2-9cd7-8b9e4cfedabc">all joints filled solid with mortar; and</li><li id="_27a18764-ed3e-41a4-8178-b0185259fd0d">an air space not less than 40 mm between the leaves; and</li><li id="_a433d3c8-c760-4fa2-9e97-972dc1dd9c52">the leaves connected by ties in accordance with AS 3700, except ‘(for piers—isolated and engaged)’ is removed from Clause 8.5.1(d) and where Clause 8.5.1 requires design for unreinforced masonry in accordance with Section 7, the member must also be designed as unreinforced masonry in accordance with Tables 10.3 and 4.1(a)(i)(C) of AS 3700; and</li><li id="_7ec93f50-0cc9-4845-882f-74cc755037ae">wall tie spacing as set out in <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/4857_0.12.0.xml#_bf6b700b-2c13-413d-9b5f-8440a4ae7dad" id="_283ea56f-017b-4a07-9e88-90d11c6a6cbb" referencetype="Text" scope="local" synctargettext="false" type="standard-part">Part 5.6</xref>.</li></ol></desc-note></image-reference>