<?xml version="1.0" encoding="UTF-8" standalone="no"?><table-reference graph="None" id="_cc51d1dc-0a2d-4d6e-bcff-6bb2823559c8"><num>S36C2h</num><title id="_b575bdae-0cde-44bc-8dee-49d536700918">Typical R-Values for airspaces: non-reflective non-ventilated</title><table id="_42ae6538-25c7-425d-ba06-5d2b8c80d462" keycol="1"><tgroup cols="3"><colspec colname="001" colnum="1" colwidth="144.05*"/><colspec colname="002" colnum="2" colwidth="144.15*"/><colspec colname="003" colnum="3" colwidth="143.85*"/><thead><row><entry>Position of airspace</entry><entry>Direction of heat flow</entry><entry><xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1420_0.4.0.xml#_e5acb40f-3d3d-4a3d-8987-f09f7eaadf77" id="_3ac648ab-cc8e-4d42-a658-84c80fd8f241" scope="local" type="abcb-glossentry">R-Value</xref></entry></row></thead><tbody><row><entry morerows="1">In a roof with a pitch not more than 5° or cathedral ceiling with a 20 mm to 50 mm thick roof airspace</entry><entry>Up</entry><entry>0.15</entry></row><row><entry>Down</entry><entry>0.15</entry></row><row><entry morerows="1">In a roof with a pitch not more than 5° or cathedral ceiling with a more than 50 mm to 300 mm thick roof airspace</entry><entry>Up</entry><entry>0.15</entry></row><row><entry>Down</entry><entry>0.17</entry></row><row><entry morerows="1">In a roof airspace greater than 300 mm thick or with a horizontal ceiling and a roof pitch more than 5°</entry><entry>Up</entry><entry>0.18</entry></row><row><entry>Down</entry><entry>0.28</entry></row><row><entry>In a wall</entry><entry>Horizontal</entry><entry>0.16</entry></row></tbody></tgroup></table><desc-note id="_032351bf-7b4e-4d44-ad54-5931e5607f5d"><ol outputclass="numbered"><li id="_dc601273-684d-4757-97ea-4e0d70261ccf">Linear interpolation may be used to calculate the <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="_036e5b5a-c090-4b12-808d-b03ff0174e95" inv:access="external" referencetype="Text" scope="local" synctargettext="false" type="abcb-glossentry">R-Value</xref> of the airspace in a roof with an intermediate pitch.</li><li id="_d501f97c-c2a7-4f7a-814a-678e32a6ad27">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="_fa6c5a21-a004-4739-bd47-21f341116270"><xref xmlns:inv="urn:xpressauthor:xpressdocument" format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1420_0.4.0.xml#_f438bdfd-6adb-43c4-b342-7b1656af23c4" id="_fd25e039-73d6-49c9-bcab-5acb5a5e79bb" inv:access="external" referencetype="Text" scope="local" synctargettext="false" type="glossterm">R-Values</xref> are calculated using AS/NZS 4859.2 based on the following:<ol><li id="_7e79bfa2-b039-477d-9d80-3d4198b9c8f3">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>average of summer and winter results for horizontal heat transfer (e.g. in walls).</li></ol></li><li id="_c63fefb8-7651-4a08-a8ac-5500d65f26e8">A non-ventilated airspace in a wall is one where there is no express provision for airflow through it and openings to the external environment do not exceed more than 500 mm<sup xmlns:inv="urn:xpressauthor:xpressdocument" id="_a3b6c376-0df4-4b75-8693-9a725954cee6" inv:access="external">2</sup> per metre of length in the horizontal direction.</li><li id="_fb594bc3-77de-42eb-a4aa-7f311badb11e">A non-ventilated airspace in a wall for the purposes of Note (4) includes a wall with drainage openings or weepholes that are open vertical joints in the outer leaf of a <xref xmlns:inv="urn:xpressauthor:xpressdocument" format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1214_0.9.0.xml#_d9f8479e-3794-41cf-ab60-e1588241810e" id="_2dfff0db-7931-4519-b34d-6a72ec298a2a" inv:access="external" referencetype="Text" scope="local" synctargettext="false" type="abcb-glossentry">cavity</xref> masonry wall, which are not regarded as ventilation openings.</li></ol></desc-note></table-reference>