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[Cob] Curious about the clayhoward at earthandstraw.com howard at earthandstraw.com
Mon May 11 09:37:01 PDT 2009
The oldest continuously inhabited houses were built with subsoil(dirt) with a clay content. Attend a workshop to find out how to performance test your materials and mix. Howard Switzer, Architect 668 Hurricane Creek Road Linden, TN 37096 931-589-6513 www.earthandstraw.com ----- Original Message ----- From: Robert J Churchill Cc: coblist at deatech.com Sent: Monday, May 11, 2009 1:17 AM Subject: Re: [Cob] Curious about the clay I know going in that it's not cheap but money really isn't a problem. What is a problem is I don't want to build a structure and have it fall down because the clay sucked. So I'm more interested in experiences with commercial clay or even quarry clay, not just dirt with clay in it. --- On Thu, 5/7/09, Henry Raduazo <raduazo at cox.net> wrote: From: Henry Raduazo <raduazo at cox.net> Subject: Re: [Cob] Curious about the clay To: rjc2000 at pacbell.net Cc: coblist at deatech.com Date: Thursday, May 7, 2009, 5:04 AM Clay is one of the most common substances on earth as such many people have it available for free. Just go outside and dig it up. With that said every part of the earth differs from every other part of the earth. Some people have very pure clay which shrinks drastically as it dries some have clay and silt some clay and sand. Others have no clay or so little clay their walls will barely hold together. If you do not have a good supply of naturally occurring clay in your area I would not recommend building with cob. A fairly small wall that I built in my house as a heat sink weighs 8 tons. I bought 4 tons of sand ($20.00 per ton) and mixed that with 4 tons of clay rich soil that came from digging out the basement of a near by house. The contractor was going to haul the soil 60 miles and pay a tipping fee to get rid of it, but I was willing to take it for free. Buying that much clay at a pottery place would be a bit pricey. Anyone who would be a natural builder must first be a scientist and then be an engineer. As a scientist you look around your building cite and ask What do I have? Rocks? Trees? Clay? All can be converted to building materials. Clay is one of the most versatile because it has so many uses as a plaster, load bearing material or refractory. You need to experiment to find the best mix. Sometimes you need to add sand sometimes just straw. You make bricks and then destroy the bricks to determine the best combination of materials. When you know the best combination of materials then you become an engineer and ask yourself "How do I make 8 tons of this stuff?" I like to mix with a rototiller on a slab. You may want to mix with your feet on a tarp. What ever. You need a lot of stuff to build a house. Ed On May 7, 2009, at 1:19 AM, Robert J Churchill wrote: > The word "clay" is used repeatedly but really where exactly is all this clay coming from? I have no idea where I'm supposed to get all this clay. For me, it would be easier just to buy clay from a ceramics shop but I don't even know if that would work. I live in an urban area and it's not like we can just go out and dig up clay at a local quarry. > _______________________________________________ > Coblist mailing list > Coblist at deatech.com > http://www.deatech.com/mailman/listinfo/coblist > _______________________________________________ Coblist mailing list Coblist at deatech.com http://www.deatech.com/mailman/listinfo/coblist
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