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			<title>Green Building Forum - internal wall insulation infront of chimney stack</title>
			<lastBuildDate>Tue, 25 Aug 2026 12:55:15 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>internal wall insulation infront of chimney stack</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18353&amp;Focus=309323#Comment_309323</link>
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		<pubDate>Sun, 21 Sep 2025 09:15:22 +0100</pubDate>
		<author>chrisinbrighton</author>
		<description>
			<![CDATA[Hello,Ive been going around in circles looking for the best way to internally insulate one wall in an old victorian flat.It is a top floor flat which has two slate hung mansard roof walls(which ive insulated already externally) and one which is basically just a very long chimney stack.<br />My idea is to get the walls back to brick,then build stud wall with 75mm Kooltherm,then polythene,then plasterboard. I would leave a small airgap between the kooltherm and brick and have vent holes going into the unused chimney stack.<br />Research ive done suggests going down the breathable route for old bulidings but im not sure ill get a good enough insulation value.]]>
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		<title>internal wall insulation infront of chimney stack</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18353&amp;Focus=309331#Comment_309331</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18353&amp;Focus=309331#Comment_309331</guid>
		<pubDate>Sun, 21 Sep 2025 13:04:46 +0100</pubDate>
		<author>tony</author>
		<description>
			<![CDATA[I wouldn’t leave a ventilation gap, the wall should be self drying so long as nothing impermeable on the outside including cement pointing]]>
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