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			<title>Green Building Forum - roofing slates</title>
			<lastBuildDate>Fri, 17 Apr 2026 03:12:40 +0100</lastBuildDate>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=252631#Comment_252631</link>
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		<pubDate>Sun, 08 Jan 2017 19:32:57 +0000</pubDate>
		<author>rsk1</author>
		<description>
			<![CDATA[Can anyone give a comparison of the eco credentials of real versus artificial roofing slates? And while we're at it, any other kind of comparison such as longevity and cost]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=252636#Comment_252636</link>
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		<pubDate>Sun, 08 Jan 2017 20:35:50 +0000</pubDate>
		<author>Nick Parsons</author>
		<description>
			<![CDATA[Some fibre-cement slates are nearing the end of their life at around 30 years. There's a good example about 200 yards from where we last met! I don't know about embodied energy-type calcs, but bear in mind that the life of a real slate could be at least 4-5 times as long as a fibre- (and quite possibly asbestos-) cement 'slate'.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=252652#Comment_252652</link>
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		<pubDate>Mon, 09 Jan 2017 10:14:36 +0000</pubDate>
		<author>owlman</author>
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			<![CDATA[Cambrian from Redland Monier, state 60 years. made from 60% natural slate.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=252656#Comment_252656</link>
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		<pubDate>Mon, 09 Jan 2017 10:55:18 +0000</pubDate>
		<author>MarkyP</author>
		<description>
			<![CDATA[cant comment on the eco aspect but we used real slate on our project. it was a toss up between welsh and spanish, we went for quality spanish in the end - SSQ's Domiz 1st. They come with a 75 year guarantee and welsh naitonal parks approval. Nice looking slates, pleased with them.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=252663#Comment_252663</link>
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		<pubDate>Mon, 09 Jan 2017 13:15:17 +0000</pubDate>
		<author>SteamyTea</author>
		<description>
			<![CDATA[Can't comment on longevity of eco slates (whatever that means), but when I looked at the embodied energy and carbon dioxide emissions of some recycled rubber ones, they were not as good as natural slate.<br />Recycling is not always that good when it comes to embodied energy and carbon dioxide emissions.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310268#Comment_310268</link>
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		<pubDate>Sun, 22 Feb 2026 20:29:03 +0000</pubDate>
		<author>Victorianeco</author>
		<description>
			<![CDATA[Any up to date recommendations?<br /><br />Currently considering our roofing options - we want Nordic style roofing perhaps standing seam but open to suggestions be it black and to last]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310271#Comment_310271</link>
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		<pubDate>Sun, 22 Feb 2026 22:23:28 +0000</pubDate>
		<author>fostertom</author>
		<description>
			<![CDATA[Are you close enough to the sea to get salt spray which attacks even galvanised and top quality stainless? If not, then colour coated profiled metal sheeting - trad agricultural 3" x 3/4" sine-wave 'galvanised iron' in 0.7mm (not standard 0.5mm) grade is my favourite, always handsome if precisely done. Maybe nothing less than zinc will do - don't even think of the zinc coated steel look-alike standing seam systems - they show rust streaks soon enough even inland. Website doesn't say what the Catnic product is made of, but everything else they make is coated mild steel - don't touch it.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310275#Comment_310275</link>
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		<pubDate>Mon, 23 Feb 2026 08:51:26 +0000</pubDate>
		<author>fostertom</author>
		<description>
			<![CDATA[To add - Catnic Solastream is the solar-panel augmented version of Catnic Urban, which yes is just colour coated Tata steel, def not for a salty atmosphere, and AFAIK not for inland either, as a cheap alternative to solid-zinc standing seam, as it soon shows rust streaks. Why should it do that, when the same-material (colour coated steel) works fine as 'corrugated iron'? Must be because as standing-seam, the metal has to be 'worked' and crimped, while profiled metal sheeting is not. Even cut ends don't seem to rust, whether done with the approved nibbler/shear tool (which nicely compresses the painted edge) or with more damage and paint-melting with a cutting disc (the nibbler only works straight across the sheet - if cut diagonally or curved, has to be disc'd). I guess the working/crimping disrupts the paint into flakes, which then hold water (as a clean cut does not).]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310284#Comment_310284</link>
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		<pubDate>Mon, 23 Feb 2026 21:25:49 +0000</pubDate>
		<author>Victorianeco</author>
		<description>
			<![CDATA[We're about 70m up from sea level and a good 500m away so I'd say not affected<br /><br />Traditional agricultural gives just that, the feel of a barn or a shed, can't see how this would work on the property.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310286#Comment_310286</link>
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		<pubDate>Tue, 24 Feb 2026 09:26:28 +0000</pubDate>
		<author>djh</author>
		<description>
			<![CDATA[We avoided steel for our roof and went with aluminium. It seems to be OK but I suppose it's only been ten years. Zinc is supposed to be very good, but I have no experience.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310288#Comment_310288</link>
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		<pubDate>Tue, 24 Feb 2026 10:46:54 +0000</pubDate>
		<author>fostertom</author>
		<description>
			<![CDATA[Aluminium also not good at the seaside!]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310290#Comment_310290</link>
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		<pubDate>Tue, 24 Feb 2026 15:36:21 +0000</pubDate>
		<author>Nick Parsons</author>
		<description>
			<![CDATA[Fostertom wrote:<br /><br />''Aluminium also not good at the seaside!''<br /><br />FT, I guess you were galvanised into action to say that.... (I'll get my coat)]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310292#Comment_310292</link>
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		<pubDate>Tue, 24 Feb 2026 16:24:29 +0000</pubDate>
		<author>djh</author>
		<description>
			<![CDATA[That'll be why they build some boat hulls out of aluminium then <img src="/newforum/extensions/Vanillacons/smilies/standard/devil.gif" alt=":devil:" title=":devil:" />  You do need to choose the right alloy and the right surface covering, of course. Take expert advice.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310293#Comment_310293</link>
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		<pubDate>Tue, 24 Feb 2026 17:44:07 +0000</pubDate>
		<author>chrisinbrighton</author>
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			<![CDATA[It is the anodised surface finish that gives aluminium the corrosion resistance for use on boats etc]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310294#Comment_310294</link>
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		<pubDate>Tue, 24 Feb 2026 19:49:52 +0000</pubDate>
		<author>fostertom</author>
		<description>
			<![CDATA[But it's that and/or stove enamel/colour coating that goes dull/pitted, in marine atmosphere. Yes, if not anodised, or if anodising fails, Al soon starts growing white fluff. Maybe Al boats get lots of re-painting?<br /><br />If people disagree, get maintenance-free, longtime smart looks with Al in a salt-blown location, I'll change my belief. AFAIK, Scandinavian-grade timber windows with factory opaque stain finish (no Al facings) stay smart longest by the sea - and can be re-finished at quite long intervals.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310295#Comment_310295</link>
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		<pubDate>Wed, 25 Feb 2026 00:06:33 +0000</pubDate>
		<author>WillInAberdeen</author>
		<description>
			<![CDATA[Aluminium boats (or underwater bits like outboard motors) often have zinc anodes to stop them corroding, and use specific alloys with a lot of magnesium chrome manganese and whatnot for corrosion resistance. Smaller items like masts and fittings are anodised after all shaping and welding has been done - don't think this works for roofs where seams are folded in situ.<br /><br />Aluminium is a bit awkward to fasten as it is too soft to use for satisfactory screws, so has to be fastened with a different material like stainless steel and eventually they corroded each other. Got to keep it away from anything copper or brass.<br /><br />But I have a few aluminium masts from about 1970 I think so with the right treatment it can last.]]>
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		<title>roofing slates</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=14817&amp;Focus=310296#Comment_310296</link>
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		<pubDate>Wed, 25 Feb 2026 08:25:18 +0000</pubDate>
		<author>fostertom</author>
		<description>
			<![CDATA[Interesting, Will. And I always worried about even stainless steel screws in contact with aluminium.]]>
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