<?xml version="1.0" encoding="UTF-8" standalone="no"?><table-reference graph="None" id="_e118e8c6-a3bf-4dff-bf0a-b4a913499cf0"><num>S36C2i</num><title id="_ef9e7238-d994-4e67-9356-9233c02beb01">Typical R-Values for airspaces: reflective non-ventilated</title><table id="_53bcf59b-cba2-4fb5-b764-086d7ab58d9f" keycol="1"><tgroup cols="3"><colspec colname="001" colnum="1" colwidth="144.00*"/><colspec colname="002" colnum="2" colwidth="144.00*"/><colspec colname="003" colnum="3" colwidth="144.00*"/><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="_a75b9647-da85-4cec-ae75-f7a3c4d3daef" referencetype="Text" scope="local" synctargettext="false" type="abcb-glossentry">R-Value</xref></entry></row></thead><tbody><row><entry>In a wall with an inner reflective surface of 0.05 emittance and a 20 mm to 100 mm airspace to the wall lining</entry><entry>Horizontal</entry><entry>0.61</entry></row><row><entry>In a wall with a central reflective membrane with an inner surface emittance of 0.05 and a 20 mm to 100 mm airspace from the membrane to the wall lining, and an outer anti-glare emittance of 0.08 and a 20 mm to 100 mm airspace to the wall cladding</entry><entry>Horizontal</entry><entry>1.1</entry></row><row><entry>In a wall with an outer anti-glare reflective surface of 0.08 emittance and a 20 mm to 100 mm airspace to the wall cladding</entry><entry>Horizontal</entry><entry>0.53</entry></row></tbody></tgroup></table><desc-note id="_b96ba19e-9b47-48e7-93f8-4803a19bd1fa"><ol outputclass="numbered"><li id="_a7f7fca0-abb1-45a4-98af-8f4488fd58e2">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 500 mm<sup id="_a48cc4f7-6e37-474c-8818-4e727e806341">2</sup> per metre of length in the horizontal direction.</li><li id="_dbc4e91e-2faa-4ac3-bbae-2c5dfc3c13e1">A non-ventilated airspace in a wall for the purposes of Note (1) includes a wall with drainage openings or weepholes that are open vertical joints in the outer leaf of a <xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1214_0.9.0.xml#_10d8bd04-d86b-42d9-a132-983737bb8ef3" id="_cc018eff-2952-4232-82e4-d049dd19f6cc" referencetype="Text" scope="local" synctargettext="false" type="glossterm">cavity</xref> masonry wall, which are not regarded as ventilation openings.</li><li id="_e2ad7515-d11f-4d8d-8fec-73f42f297848"><xref format="dita" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/1420_0.4.0.xml#_f438bdfd-6adb-43c4-b342-7b1656af23c4" id="_663b3706-e127-4c36-8c77-87da9ec0ebba" 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="_77f7774f-b2f9-474e-a5ed-e32b5acd55cf">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); and</li><li>emittances are normal emittances of bounding surfaces in accordance with AS 4200.1.</li></ol></li></ol></desc-note></table-reference>