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shadiya
Joined: 02 Feb 2008 Posts: 1285
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RichardW
Joined: 24 Aug 2006 Posts: 8443 Location: Llyn Peninsular North Wales
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shadiya
Joined: 02 Feb 2008 Posts: 1285
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resistance is fertile
Joined: 24 Oct 2008 Posts: 1534 Location: The heart of North Devon
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Mutton
Joined: 09 May 2009 Posts: 1508
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shadiya
Joined: 02 Feb 2008 Posts: 1285
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Woodburner
Joined: 28 Apr 2006 Posts: 2904 Location: Essex
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Posted: Wed Oct 28, 09 11:56 am Post subject: |
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Sempervivums and many if not all sedums don't need much soil at all, but if you want to avoid using plastic/rubber liner, I think you need some depth of soil so that it doesn't get instantly saturated and drain through the gaps when it rains more than a llight shower.
A traditional way of roofing in the middle ease was to span a room with beams that were in fact whole (thinnish) tree trunks, that tapered gently from one end to the other. They were placed alternating 'top to bottom' so that along each wall it would alternate thick end, thin end, thick end. IYSWIM The thinner ends were raised so that they were roughly level with the top of the thick ends, and on top of that either masses of twiggy brush wood (not so good) or stiffish mats of reeds or possibly thinly split cane, on top of that went a layer of cobb, about 6 inches thick, and the whole thing would have a gentle slope to water spouts.
The thickness of the beams needed depends more on the span than the weight of the covering.
Unfortunately I can't find a good picture. You can just about make out the thin beams used for the short span of this balcony roof, if you look at teh top of the whitewashed wall though. In the room behind, they would be significanlty thicker and more regularly arranged. https://upload.wikimedia.org/wikipedia/fa/thumb/6/60/Lalajin-An_old_house.jpg/350px-Lalajin-An_old_house.jpg(It says old house but actually it's not; unless you call 30ish years old. |
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James
Joined: 11 Jan 2006 Posts: 2866 Location: York
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shadiya
Joined: 02 Feb 2008 Posts: 1285
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James
Joined: 11 Jan 2006 Posts: 2866 Location: York
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shadiya
Joined: 02 Feb 2008 Posts: 1285
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vegplot
Joined: 19 Apr 2007 Posts: 21301 Location: Bethesda, Gwynedd
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