<?xml version="1.0" encoding="UTF-8" standalone="no"?><table-reference xmlns:xt="urn:xpressauthor:trackchanges" graph="None" id="_3b3d1306-30a3-4f22-ab2c-6aca0dac6cbd"><num>S36C2m</num><title id="_269f7c9d-bdab-41ee-846e-fca79639208b">Typical R-Values for non-ventilated roof spaces with a reflective surface: Pitched roof with cathedral ceiling, roof space not more than 300 mm thick</title><table id="_000494cc-1d72-46ea-8d64-de3c18ef8a32" keycol="1"><tgroup cols="6"><colspec colname="001" colnum="1" colwidth="107.95*"/><colspec colname="006" colnum="2" colwidth="107.90*"/><colspec colname="002" colnum="3" colwidth="107.90*"/><colspec colname="003" colnum="4" colwidth="36.10*"/><colspec colname="005" colnum="5" colwidth="36.10*"/><colspec colname="004" colnum="6" colwidth="36.10*"/><thead><row><entry morerows="1">Emittance of airspace bounding surfaces</entry><entry morerows="1">Thickness of roof space</entry><entry morerows="1">Direction of heat flow</entry><entry nameend="004" namest="003"><xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1420_0.4.0.xml#_e5acb40f-3d3d-4a3d-8987-f09f7eaadf77" id="_66de59a4-c038-4130-967e-594f57f56e51" scope="local" type="abcb-glossentry">R-Value</xref> of reflective airspace</entry></row><row><entry>15° to not more than 25° pitch</entry><entry>more than 25° to not more than 35° pitch</entry><entry>more than 35° to not more than 45° pitch</entry></row></thead><tbody><row><entry>Surface 1 emittance 0.9, Surface 2 emittance 0.05</entry><entry>≤ 300 mm</entry><entry>Up</entry><entry>0.43</entry><entry>0.43</entry><entry>0.43</entry></row><row><entry>Surface 1 emittance 0.9, Surface 2 emittance 0.05

</entry><entry>20 mm</entry><entry>Down</entry><entry>0.59</entry><entry>0.59</entry><entry>0.59</entry></row><row><entry>Surface 1 emittance 0.9, Surface 2 emittance 0.05</entry><entry>60 mm</entry><entry>Down</entry><entry>0.91</entry><entry>0.82</entry><entry>0.75</entry></row><row><entry>Surface 1 emittance 0.9, Surface 2 emittance 0.05</entry><entry>100 mm to ≤ 300 mm</entry><entry>Down</entry><entry>0.96</entry><entry>0.85</entry><entry>0.76</entry></row></tbody></tgroup></table><desc-note id="_06b9090e-ba1b-458f-903a-bc02298f8a5c"><ol outputclass="numbered"><li id="_ba0fca7b-205b-4380-8cdb-07c8140d06a5">A non-ventilated airspace in a roof is one with continuous cover, such as metal or sarked tiles, and no specific provision for ventilation.</li><li id="_bccf26e8-c26f-440b-8cf6-aa10926f7fd4">Linear interpolation may be used to calculate the <xref xmlns:qxa="urn:schemas-quark-com:xmlauthor" format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1420_0.4.0.xml#_f438bdfd-6adb-43c4-b342-7b1656af23c4" id="_38b7a382-6565-4cfe-bf88-b1831211eecd" qxa:read-only="true" referencetype="Text" scope="local" synctargettext="true" type="glossterm">R-Value</xref> of the airspace in a roof with an intermediate pitch<xt:insText xt:action="start" xt:author="Lee Liu" xt:dateTime="2024-04-15T18:15:00" xt:id="95f23136-ce5e-4258-a6b1-b3aa89cb0d30"/> and thickness<xt:insText xt:action="end" xt:id="95f23136-ce5e-4258-a6b1-b3aa89cb0d30"/>.</li><li id="_c8d16e06-c9bc-43f1-80ed-9cd83a9d5319"><xref xmlns:inv="urn:xpressauthor:xpressdocument" format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1420_0.4.0.xml#_e5acb40f-3d3d-4a3d-8987-f09f7eaadf77" id="_6ceeef38-215a-42d8-866c-9a941e8f182d" inv:access="external" referencetype="Text" scope="local" synctargettext="false" type="abcb-glossentry">R-Values</xref> are calculated using AS/NZS 4859.2 based on the following:<ol><li id="_9e197e20-4810-4725-bc36-53fe87651d6a">summer temperatures of 24°C internally and 36°C externally for heat transfer down; and</li><li>winter temperatures of 18°C internally and 12°C externally for heat transfer up; and</li><li>emittances are normal emittances of bounding surfaces in accordance with AS 4200.1.</li></ol></li></ol></desc-note></table-reference>