<?xml version="1.0" encoding="UTF-8" standalone="no"?><image-reference id="_e1290d1d-77bf-47ec-b921-da99317f860c" variation="NT"><num>10.7.1d</num><title id="_2c662342-fa09-4bbc-bfb9-32f57607f42e">Construction of walls to reduce impact sound and achieve a 50 R<sub id="_939ef888-90cf-4df4-acf8-d9a1ab7786b7">W</sub>: concrete blockwork</title><image alt="Construction of walls to reduce impact sound and achieve a 50 RW: concrete blockwork." href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/10-7-1d-construction-of-walls-50-rw-concrete-blockwork-NT.svg"/><desc-note id="_fe255d86-9c60-46b3-b7c6-eb4c9620da89"><p>190 mm thick concrete block masonry with—</p><ol outputclass="alpha"><li id="_da441d9c-58ac-4f77-80c1-3cee2409cf9e">each face of the blocks fitted with 50 mm x 50 mm timber battens, spaced at not more than 610 mm centres, screw-fixed into resilient plugs with rubber inserts; and</li><li id="_c5add530-a0e1-4794-b7a5-866b31ec5b57">the space between the battens completely filled with mineral or glass wool blanket or batts not less than 50 mm thick; and</li><li id="_6a64d39e-6d0d-4254-99c0-be184e889604">the outer face of the battens finished with plasterboard not less than 10 mm thick.</li></ol></desc-note></image-reference>