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Cob & Natural Building School

1.5k members • $10/month

6 contributions to Cob & Natural Building School
Cob FirePit
Started a new cob project today. A fire pit. I’ve got an entire wheel barrow full of dirt so there’s more to build. I’m foregoing the straw this time around, with such a small structure I’m curious to see how it’ll hold up without that fiber I don’t have a tarp so I’m mixing in a small bucket. 🪣 I prefer the tarp, much easier and feet are better mixing tools than hands for cob. @Alex Sumerall if I get some garden lime from Home Depot, is there a curing process that I can do? Last time I tried that, it all washed away - but I didn’t cure it. I had read somewhere if you cover it with a plastic for a few days the C02 put off can “cure” it
Cob FirePit
1 like • Apr 16
@Danielle Cherdak Horticultural lime is ground limestone, not burned, it does not set. Construction lime sets under the influence of CO2 carbon dioxide, NHL is hydraulic lime, sets under the influence of water, no carbon dioxide is needed. NHL comes in different hardnesses, it is used when it is closed off from air, for example when it is used thickly.
Rammed Earth Shower 🚿 progress being made!
Yesterday, I poured the floor on my new rammed earth outdoor shower. I'm happy to say, this luxurious shower will be available for workshop students starting in April! Yesterday, I also received the 2000 bricks that I'll be using to construct the stem wall for the massive cob wall we'll be constructing at our upcoming hands-on workshops. Check out the class schedule here: https://www.thiscobhouse.com/cob-workshops/ What do you think of the new shower so far?
Rammed Earth Shower 🚿 progress being made!
2 likes • Feb 27
That shower wall looks really good!
First timer
I wanted to start small for my first cob project so I decided to try a little rocket stove.i made the bottom tray first with a perlite clay mixture. I ran out of materials before I finished the “J tube” and the ground has been covered in snow so I can’t get more. I am wondering if the crack is because I didn’t add enough sand? Or too much straw? Thanks for any suggestions.
First timer
3 likes • Feb 21
If your material has the right adhesion, then make ratio tests. In the picture it looks like the adhesion is not plastic. I could be wrong because the soil is different here. For the J rocket stove, the horizontal part should be quite short. As soon as the weather gets a little better, I would like to make something similar, as a test.
2 likes • Feb 21
They say that the smaller the value of x, the better the stove works.
Straw & Hemp Fiber Insulation Walls
I am as much an advocate for straw and hemp fiber walls as I am for earth walls. Natural fiber and earth have different properties, but deliver the overall benefits that people are looking for in construction. I'll be opening up my straw-clay course very soon. This class will cover in detail how to construct straw-clay and hempcrete/hemp-slip walls. Who's interested in these natural building materials?
2 likes • Feb 12
I'm interested, that's why I'm here!
Cob Rocket Stove
Earlier in 2024, after the April TN Workshop with Alex - I came home and built a cob rocket stove. It worked great, until it fell apart completely LOL' It fell apart because the lime plaster I used incl regular garden lime from the hardware store, and I didn't 'cure' it... or at least that's what I think happened. I figured out pretty quickly (after the first rain) that the plaster didn't work and never got around to fixing it. A few weeks ago after some very heavy rain it finally toppled over. I've got a lot of footage I haven't edited yet, IDK if I will get around to it... but below you can see a few pics/vids from the project! Overall, it was fun. 10/10. But I need to learn more about true lime plaster.
Cob Rocket Stove
2 likes • Feb 12
If you want to make it a little more resistant, you don't have to plaster it with lime, just paint it with slaked lime. Apply it in several layers, and when it cracks from the heat, repair it with a new layer. If you rub the lime with olive soap before it sets, it will be more resistant to water. However, it will be difficult for the new layer to stick to it. The best protection is to cover it.
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László Gyüre
2
5points to level up
@laszlo-gyure-3459
I live in Hungary, Europe. I deal with clay and decorative coatings. https://www.facebook.com/profile.php?id=61568516243487

Active 1d ago
Joined Feb 7, 2025
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