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			<title>Green Building Forum - timber frame extension wall build up</title>
			<lastBuildDate>Sat, 31 Oct 2026 23:33:13 +0000</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>timber frame extension wall build up</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18497&amp;Focus=311763#Comment_311763</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18497&amp;Focus=311763#Comment_311763</guid>
		<pubDate>Sat, 31 Oct 2026 20:52:11 +0000</pubDate>
		<author>mitchino</author>
		<description>
			<![CDATA[I was visiting my sister today who is having an extension built, timber frame inner leaf with 140mm deep studs, filled with Kingspan, 10mm OSB, 50mm cavity then rendered blockwork. I was surprised to note that on the inside, the approved plans just have a vapour barrier and 12.5mm plasterboard. I thought regs would require 25mm insulated plasterboard to combat cold bridging, especially as in some areas there are 4 studs nailed together to support timber lintels over windows etc. The roof is the same, poorly fitted Kingspan between the joists, vapour barrier and 12.5mm plasterboard.<br /><br />Apparently building control have been onsite and are happy. Is this normal practice?]]>
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