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Canvas as an AP construction material
http://byap.backyardmagazines.com/forum/viewtopic.php?f=8&t=1726		 Page 1 of 2
Author:  Dave Donley [ Jun 23rd, '07, 23:59 ]
Post subject:  Canvas as an AP construction material
I watched a documentary about Gen. Sherman a couple weeks ago, and they talked about the pontoon bridges they built back then to cross the rivers (and therby cause mayhem thoughout the South). Some civil engineering reenactors built a few pontoons and a short bridge. The materials they used were some collapsible wooden trusses, and canvas for skining the pontoon boats.

They said canvas will swell and become waterproof - I immediately thought that this could be useful for AP grow beds or tanks, if the canvas indeed can hold water, or at least some grow bed material.

Hex's fabric troughs ( http://www.backyardaquaponics.com/forum ... 0&start=90 ) could be made from organic cotton rather than synthetics, which would add to the feel-good quotient. I imagine that for tank use you'd have to keep the water from wicking or seeping into the ground?

Canvas I would imagine would be much more available in less developed regions of the world, unlike say EPDM or even concrete?
Author:  earthbound [ Jun 24th, '07, 08:55 ]
Post subject: 
I wonder how the canvas goes for being truley water proof.. Here in Australia canvas water bags have been a bit of an icon for many many years. http://www.campout.com.au/carwaterbag.html

Though one of the points of a canvas water bag was that the water seeping through the canvas would evaporate, cooling the internal water. I wonder how much this might effect things, what sort of evaporation rates you may get.
Author:  Dave Donley [ Jun 24th, '07, 09:10 ]
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Looks like for canoes and whatnot they paint it to make it totally watertight. If you used a safe paint that would be acceptable.
Author:  RupertofOZ [ Jun 24th, '07, 12:00 ]
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DD, from memory I think they used bitumen, or at least a bitumen based paint
Author:  Dave Donley [ Jun 24th, '07, 19:03 ]
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The one site I looked at yesterday for canoes said you could use any cheap paint you have lying around.
Author:  Dave Donley [ Jun 24th, '07, 19:12 ]
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Here's is an interesting link to concrete-impregnated canvas shelters:

http://www.wired.com/science/discoverie ... 5/03/66872
Author:  mokevinb [ Jun 25th, '07, 04:10 ]
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Actually, back during the American Civil War they used boiled linseed oil. Put on a couple of coats on the outside, let it dry, and it aids in the water repellency. Does'nt make it water proof, but it helps keep the pontoon bridge floating until a permeanant bridge could be constructed. Probably would do the same thing for your tank or growbed. (I'm not sure of its toxicity though.)

Kevin
Author:  Jaymie [ Jun 25th, '07, 05:44 ]
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:shock: don't start saying things like toxicity and linseed in the same sentence :shock: I put them on my loaves of bread every day :shock:
Author:  EllKayBee [ Jun 25th, '07, 15:52 ]
Post subject: 
Quote:
I put them on my loaves of bread every day


What - toxicities.....what do they taste like :bigsmurf:
Author:  Jaymie [ Jun 25th, '07, 16:06 ]
Post subject: 
linseeds taste like linseeds! ;) I've never actually tasted any by themselves :oops: But, just for you Les, I will tomorrow :D
Author:  EllKayBee [ Jun 25th, '07, 17:10 ]
Post subject: 
Nah! - I wanna know wot toxicities taste like :tongue2:
Author:  Xzorby [ Jun 25th, '07, 21:42 ]
Post subject: 
Jaymie wrote:
:shock: don't start saying things like toxicity and linseed in the same sentence :shock: I put them on my loaves of bread every day :shock:

I don't think linseed is toxic, but boiled linseed oil most definately is. Actually, it's not boiled at all; they add heavy metals and some other stuff to make it dry faster.

You don't need a growbed to be entirely watertight if it's placed right over the fish tank, right? Although you would probably need a bigger pump if you want to use F&D..
If it's not placed over the tank though, something like Hex's troughs would do, but then you still need some water proof fabric or gutter under it.
Author:  EllKayBee [ Jun 26th, '07, 16:24 ]
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Toxicities sure worked well if Jaymie's new avatar is any guide...seems like Mon has been hitting the hot stuff too :shock:
Author:  Nova [ Jun 26th, '07, 16:45 ]
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Sock full of walnuts... ;)

Nova
Author:  TimC [ Jun 26th, '07, 18:29 ]
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lol...... its nudda tumar!
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