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			<title>Green Building Forum - Efflorescence or mould?</title>
			<lastBuildDate>Wed, 10 Jun 2026 10:07:39 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>Efflorescence or mould?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16425&amp;Focus=278381#Comment_278381</link>
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		<pubDate>Tue, 28 Jan 2020 12:11:18 +0000</pubDate>
		<author>WeeBeastie</author>
		<description>
			<![CDATA[About two months ago I had polythene and sand laid on the ground below my floor void.  There was a white substance in places on the ground and on the brick foundation walls beforehand.  I'd assumed this was efflorescence.  I've just noticed there is now (presumably) the same white substance appearing on the sand, near the perimeter below a south-facing bay window.  Does this suggest that this is mould rather than efflorescence?  The sand was damp when laid.  If mould, what should I do?<br /><br />Thanks.]]>
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		<title>Efflorescence or mould?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16425&amp;Focus=278408#Comment_278408</link>
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		<pubDate>Tue, 28 Jan 2020 23:10:56 +0000</pubDate>
		<author>tony</author>
		<description>
			<![CDATA[collect some and see if it dissolves in water, it will and mould does not dissolve, i think that it will be sodium nitrate crystals]]>
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	<item>
		<title>Efflorescence or mould?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16425&amp;Focus=278445#Comment_278445</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16425&amp;Focus=278445#Comment_278445</guid>
		<pubDate>Thu, 30 Jan 2020 13:06:37 +0000</pubDate>
		<author>WeeBeastie</author>
		<description>
			<![CDATA[Yep, efflorescence falling off the brick walls.  Relieved.]]>
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