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			<title>Green Building Forum - Harling: replace or retain?</title>
			<lastBuildDate>Mon, 25 May 2026 08:48:20 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>Harling: replace or retain?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18072&amp;Focus=305030#Comment_305030</link>
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		<pubDate>Sun, 21 Jan 2024 07:29:54 +0000</pubDate>
		<author>WeeBeastie</author>
		<description>
			<![CDATA[I have a 1930 semi-detached bungalow in the east of Scotland.  The walls are two leaves of brick with a finger-width cavity between, tied occasionally with a course of brick.  100mm cork IWI has been added, with Secil lime-based adhesive and finish. The existing harling (wet dash) is cement-based, with what I presume is a modern 'non-breathable' paint finish.  The harling seems sound apart from where building work requires patching.  My question is whether the harling should be replaced with a lime-based finish (K Rend's K Lime Roughcast has been suggested) + silicate paint to allow any moisture in the wall a route out to the exterior as well as the interior.  Or do I ensure the existing harling is meticulously repaired in an attempt to eliminate rain getting in?  One traditional lime harling company has suggested that as we get more and more rain a lime-based exterior could at times let damp right through the brick tie courses. The IWI supplier advises leaving the existing (made good) - that would certainly save a lot of money.  Thoughts?]]>
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		<title>Harling: replace or retain?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18072&amp;Focus=305031#Comment_305031</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18072&amp;Focus=305031#Comment_305031</guid>
		<pubDate>Sun, 21 Jan 2024 09:55:07 +0000</pubDate>
		<author>Peter_in_Hungary</author>
		<description>
			<![CDATA[If it ain't broke don't fix it.<br /><br />How long has the existing been in place without attributable problems ? Unless you can attribute problems to the existing I would leave it alone.]]>
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