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Owned by Alex

Cob & Natural Building School

1.6k members • $10/month

Learn how to build your own natural, non-toxic house with cob and straw-clay. Save money, live debt-free, and be healthy!

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134 contributions to Cob & Natural Building School
Fall 2026 Cob, Straw & Earthen Floor Workshops Open!
I'm happy to announce my upcoming Fall 2026 Cob & Straw Building Workshops are open for registration. Come and join us in beautiful eastern Tennessee for our next Introduction to Cob and Straw Workshops! We will be constructing both a cob building and a straw-clay building, applying lime plaster finish, and pouring an earthen floor! This workshop is perfect for beginners and experts alike! You will get the expert knowledge to build with cob and straw! Either for small-scale structures or large-scale projects like homes and buildings. Please click the link below to get the schedule and class details. Click Here for Schedule and Workshop Details I have NOT raised class prices, and I've added even more great benefits to the classes. So, you can still enjoy the low pricing and incredible value ratio! I look forward to meeting more of you here this Fall! Alex
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Fall 2026 Cob, Straw & Earthen Floor Workshops Open!
Trial wall test and another question
We made a trial wall to test our mixture. It's looking good so far. Also got the bricks finished this week. Letting the mortar set up a bit before pouring concrete in the walls. Do the cob walls need deadman wherever we put walls?
Trial wall test and another question
0 likes • 9d
Wow, beautiful brickwork! Sorry, I'm just getting back to the Skool and catching up on the computer work here. Amazing to see your progress! The "deadman" or wall anchors are generally just to secure windows and doors to the cob walls. Are you talking more about something like anchors/rebar sticking out of the stem wall. These can help in a seismic zone to prevent the cob walls from shearing off the stem wall. But I'm not sure if that's what you were meaning..
0 likes • 6d
@Jessica Poe Oh, okay! I see now. There are going to be a few ways you could do that. Best way would be to embed a 2x4 (or 4x4) into the cob wall wherever your stick frame wall will touch up against the cob walls. Just attach some deadman anchors to these embedded 2x4's so they can't ever dislodge from the cob wall. Then your stick frame walls can just screw into these anchors at the wall. I'd also anchor the stick frame walls to the floor somehow. What kind of floor system are you putting on the inside?
Making progress
Started working on making cob slip forms and put in door frames. We got sand delivered and brick work should start Monday 😁
Making progress
0 likes • 20d
Exciting! This is all looking so good. The forms look great too. Are those hog panels? Curious where you found them.
0 likes • 17d
@Jessica Poe Oh, nice! I've been seeing those display shelves a lot lately, and wondering where someone could buy some. Nice find!
Building a COB house in 2 phases.
Hello to everyone, my husband, our daughter, and I have a nice piece of land where we are starting our project to self-build a COB house. We'd like to ask you all about your experience connecting a new section of a COB house to an existing one. We want an 8-meter x 14-meter house, but we can't build it all in one go, so we have designed the floor plan with two rectangles, one attached to the other. Our doubt arises when connecting the walls of the first construction to the new one ..... any ideas? Thank you all for this great community 😉
0 likes • May 26
If you can integrate the foundations of Phase 1 and Pahse 2, connecting the walls should be no issue. There are different ways to integrate a new cob wall to an existing one. You will basically have rebar or wood anchors sticking out of Phase 1 wall, and then build the new cob wall around those anchors, integrating the two walls. Then you plaster over the seam of where the walls meet together.
Making door frame openings
Okay walk me through making the frame openings. I'm looking at the pictures you have, and it looks like the boards span the entire 18 in width, do I really need to use 18 in boards or If I use 10 in boards would that cause issues?
1 like • May 26
Hey Jessica, So, the window/door frame boards don't need to span the width of the wall. They can, but it's usually not necessary (Unless your putting a door and a screen door both on the same opening. For windows this is probably never needed.) The window frame only needs to be placed in the wall wherever you want the window to go. It can be towards the outside/inside/or middle. The lintel above the window/door will hold the full weight of the wall that's above the opening. Let me know if you need anymore clarification.
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Alex Sumerall
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454points to level up
@alex-sumerall-5026
Professional cob house builder and instructor at This Cob House. I teach people how to build their own natural earthen homes.

Active 1d ago
Joined Jan 30, 2025
Greeneville, Tennessee
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