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Alternative Architecture: Cob Building

Ms. Inglish has 30 years experience in medicine, psychology, STEM instruction, history, and aerospace education for USAF Civil Air Patrol.

Dogon cob houses and thatched roof in Mali.

Dogon cob houses and thatched roof in Mali.

Cob for Natural Construction

Cob is also called "cobb" and in Welsh, "clom." It is an all-natural building material containing a mix of subsoil, water, and fibrous organic materials like straw. Sand or clay is sometimes added for strength.

Adobe, Cottages and Pyramids

After reading for years about Native American and Mexican adobe houses and the construction of the Egyptian Pyramids, I realized that these were both examples of cob building. Checking at the time with historical records, modern investigative research, and personal contacts in both Egyptian archaeology and New Mexico history, this was confirmed in certain ares of each locale.

The same materials were used and are still used in parts of New Mexico. Specifically, bricks and blocks have been formed, and adobe has been molded over them small Native American communities called "pueblos."

The living roof on this cob house draws customers to buy organic popcorn to help support Stanley Park's ecological programs in BC.

The living roof on this cob house draws customers to buy organic popcorn to help support Stanley Park's ecological programs in BC.

English and American Cob Builders

Many examples of ancient cob building exist in England and have been brought to the United States by green businesses set up to build these structures and by eco-friendly individuals on their own.

Several people have written books about cob building and materials that you might check out of the library or find at your local book store or green building supply outlet:

  • Building Green: A Complete How-To Guide to Alternative Building Methods Earth Plaster * Straw Bale * Cordwood * Cob * Living Roofs by Clarke Snell and Tom Callhan is excellent. I enjoy this book because it provides step-by-step instructions and dozens of correlated pictures. These specific techniques are demonstrated at the Oakland Park Nurseries and Garden Centers around Ohio each year in free workshops and I was moved to attend a few of these by this book. I helped to build a large backyard cob pizza oven one summer and watched as builders planted a living roof on another occasion.
Living roof on a cob house.

Living roof on a cob house.

Midwest American Cob Techniques

I have looked at the materials of several house plans for cob building and examining the printed materials used in construction of a cob house in Knox County, Ohio.

I've come up with some foundation information about arches and, while what I have discovered may not fully meet your needs, I have supplied information for additional specific places to go for help.

I've also supplied several links to cob building sites that will answer email questions about cob related projects, and a couple of descriptions of some very good books that illustrate methods and give instructions in cob building.

It appears that the sturdy construction of cob, especially if straw is added into the mix of clay and sand, can support an arch over an arched window that is otherwise standard window size or even double the width of a standard window in today's construction of houses. In several pictures of completed cob homes, arches across doorways that span twice the width of standard house door also appeared strong.

You can set the window or door temporarily in place, and pretty simply mold the cob around it and let dry.

A cob home of mud and fiber in Niger, Africa.

A cob home of mud and fiber in Niger, Africa.

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Practical Cob House Plans

Several sets of plans and instructions I read suggested that the arch should be made more narrow in the center than on the ends, so that the weight the arch must bear can be somewhat reduced. No specific measurements were given.

None of the house plans indicated any means for determining the lengths of arches of any longer possible spans than a standard window, double window, door width, or double door width. However, since the cob-with-straw-mix is extremely strong when sun-baked, a longer arch span of this material may be possible. Based in standard engineering calculations, the base supporting the arch would need to be of a size, height, strength, and shape adequate to support the span of cob.

For longer cob arches, suspension bridge building engineering formulas would likely work, and your local university engineering and architecture departments would probably help you with these at no charge. Graduate students often do these sorts of projects and department professors check their work.

The Work of Freeman Yorde in America

Resource and Energy Efficient Living (REEL)

In Knox County, Freeman Yorde built himself a small house out of cob and recycled wood (for framing). A house of 336 square feet, it is built on a foundation of 12-by-24 feet.


Mr. Yorde learned what he says is the art and architecture of cob construction in Portland, Oregon from Eric Hoel, who went on to Baltimore, Maryland to work with Habitat for Humanity.

Freeman helped Eric build a house of 750 sq. ft. (or "round feet", because the building's walls are curved) above a river in Salem, Oregon.

Freeman returned to Knox County in Central Ohio in September. 2002. There he found an interesting 10-day cob building workshop in southeastern Ohio at what he recalls to be named the Green Fire Ranch on SR 50 east of Athens.

Ianto Evans, who had taught Freeman and his friend Eric how to build with cob techniques, ran the workshop. Freeman continued to live in Gambier for the year, working as a house framer for a company that had employed his father as a construction manager.

The following summer (2003), Freeman spent in Vermont. He returned to Gambier during Autumn 2003 and contacted a student group on the Kenyon College campus named Resource and Energy Efficient Living (REEL).

With REEL support, Freeman wrote a successful proposal to Kenyon College to rebuild the tool shed, which had once been a goat barn. His proposal included earthen and reclaimed materials, such as old barn beams and timbers. These were excellent ideas for sustainability.

Professor Ray Heithaus of the Kenyon biology department oversaw the BFEC and was the impetus toward success. The leaders of REEL, Prof. Heithaus, and Freeman met with Kenyon's Buildings and Grounds Superintendent and his assistant to establish a possible stipend for the building.

Actually, $3,000 was dedicated to the building, half for construction tools and materials and half for Freeman Yorde. Interestingly, at the same time, a $60,000,000 Kenyon Athletic Facility construction project had already been ongoing for a year. Kenyon officials must have considered the cob project important as well.

Kenyon Tool Shed Cob Project (2004 - 2006)

Construction on the cob tool shed in Knox County, Ohio began at the Brown Family Environmental Center (BFEC) at Kenyon College on March 31, 2004. Freeman Yorde graduated from that school in 1996 in Gambier, Ohio.

Construction on the cob shed lasted 3 building seasons, which adds up to 29 months from March, 2004 to October, 2006.

From the beginning, all work was accomplished by hand and foot, including digging, shoveling, hauling, mixing the cob, and building the wall. It took dedication and a lot of energy to complete the work.

Total cost of the building did not exceed $2,500 - excellent by construction standards. Over 200 sets of hands built the shed, using eight tons of clay, 12 tons of sand, hundreds of gallons of water, and 20 bales of straw to create earthen walls. No wonder it probably required centuries to build the pyramids of earthen bricks or stone in Egypt.

The doors to the shed were donated generously by friends. The transparent windows are from an old lake cabin in Northern Wisconsin and the stained glass windows were made by Freeman's sister-in-law in Chicago. The roof was donated by the company 64 Metals, Inc. in St. Louisville, Ohio.

Serendipity at the Tool Shed

Freeman Yorde met his future wife on this project. At the midpoint of the first building season (2004), the future Mrs. Yorde became Freeman's building partner.

The couple married in Columbus, Ohio at their church, Xenos Christian Fellowship, on May 29, 2010. In addition, Freeman reports that he came to know the Lord as a result of doing the tool shed project, becoming a Christian in Decemeber of 2004. He says that, "without God, this project never would have gotten finished."

This is all genuinely uplifting. Freeman Yorde learned sustainable building construction, met his future wife on a construction project, and found the Lord all in the same venue, whose main ingredient was the Earth used for contruction.

Life Lesson From the Shed

A meaningful quote from Freeman Yorde:

Machines are not the enemy ... and yet we cannot let what we do with our hands, the skill of our trade, be set aside to wither.

Freeman suggests the following site:

See, maintained by Ianto Evans and his wife Linda Smiley.

Cob Workshops in the Midwest

Cob revivalist Ianto Evans gave a series of Cob Workshops at the Ohio State University in 2004. Evans helped attendees to refresh current skills and to learn new ones as well. One lesson taught was that a properly constructed and molded cob house can last for over 100 years.

Cob Builders and Schools Coast-to-Coast and Canada


Cob Architecture Plans in America

  • Cob Projects - Timeless Art of Cob Building: Hundreds of projects and fantastic photos.
  • lists many workshops featuring cob in North America.
  • coblist email discussion group about cob.
  • Page of photos and description of cob.
  • This site is mostly focused on cob, and offers information and workshops.
  • Information about cob and sponsors cob workshops in Tennessee
  • This forum is specific to cob building with additional gallery, videos, and workshops listed.

© 2008 Patty Inglish MS

LEEDap on November 11, 2009:

cool cob structures! interesting info

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 13, 2009:

chloefaith - New Mexico is a gorgeous state and I've seen many pictures of the attractive cob buildings there. Easy and cheap as well as attractive and useful is the best!

Avare - thanks for commenting; glad you liked it.

Avare on May 13, 2009:

Great hub! Thanks for interesting reading. Rated it! :)

chloefaith from White Sands Area on February 22, 2009:

As a resident of New Mexico I am familiar with adobe housing. You made a nice presentation of it, funny how quickly we want to unload all that progress and revert into something easy and cheap. I am into the eco-friendly environment, but there are reasons for evolution. I love your hub.

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on December 23, 2008:

Tatjana-Mihalea -- I've joined your fan club to see more pictures like the one on your link. Of the people I know, those individuals and families that have built their own homes are happiest. Many of them have been cob buildings. They have shown my all sorts of structures, including cob "bricks" larger than myself. It is fascnating.

Tatjana-Mihaela from Zadar, CROATIA on December 23, 2008:

Wow, Patty, this is great Hub. Especially for me, I have 5years experience in cobing, while renewing my 100 years old weekend house. Cobing is amazing, because you become one with the house you build, it is such a passion, you sculpt the wals, you can do whatever you want from mud. It is hard work, but soo funny. Very soon I will write a hub about it, in case you are interested, there is one picture of my living room in the hub "How to achieve good vitality & stay young, active, healthy!".

Many thanks for this Hub.

A lot of best wishes for Xmas and Happy New Year!

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on December 01, 2008:

Thanks very much for sharing that with us, Jan. We have lots of ready building material all around us, don't we?

Jan Mosbacher from Devon on December 01, 2008:

Hi Patty

Great photo's!

I used to live in a beautiful Devon Longhouse, where the cob walls were 300 years old. It's amazing to think that walls made of straw and mud can last so long, and they're so easy to repair if there ever is a problem.

Best wishes


sherlynavia from United States on October 06, 2008:

Great hub with good stuff!

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on October 04, 2008:

That's wonderful. Congratulations on your choice!

korey on October 04, 2008:

someday i will build my own thank you

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on September 21, 2008:

Thanks blogit2050! -- I'm still looking for pictures of cob bricks large enough for a pyramid. In northern Ohio, a couple people are using large cob bricks, so I will go up asap and photog them.

blogit2050 from india on September 19, 2008:

Wow, kool piece of work and hard work...nice

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on September 19, 2008:

Great want2know! Hope some of the resources really help.

want2know on September 19, 2008:

Cool hub I am sharing this hub with a friend whos a eco building consultant it has great insite and resources.

Thank you for the information

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on August 12, 2008:

Wonderful, Nathan! Thanks for the link; people will enjoy it.

Nathan Brown on August 12, 2008:

Here's a great cob house building work exchange opportunity for anyone who's interested:

The guy running this is a friend of mine and I think he's great to work with.

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 22, 2008:

Hi dlarson! A garden wall sounds like a good first project. I hope you take pictures and do a hub of it so we can see!

I think you might try to reinforce the arch with something like chicken wire as a base, like build a framework and work the cob up around it and into it and pack it in tight. This is like putting a flat metal mesh base into a wall that needs new plastering.

If you can get the chickenwire mounted strongly into the ends of the opening for the arch, this might work wwell, and the chicken wire can be bent into a convex arch somewhat. Then, with an arch narrower slightly in the middle, you may have strength and a good looking arch. I surely hope so!


Dan from Priest River, ID on May 22, 2008:

Wow, thanks for the reply Patty! We're going to build one of these ourselves but without building permits. They don't exactly comply with the IBC and here, if an inspector can't compare it to "the book", its not going to get approved.

Maybe I'll build a garden wall first and see just how large of an arch I can build with the stuff. Then I'll load it down after it dries and see how much weight it will carry....

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 12, 2008:

Lets put some links to earthbag:

Garry Nelson from Hawaii on May 12, 2008:

Be sure and check out earthbag homes, like the honey house.

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 12, 2008:

Hi CS Alexis - An associate and friend in Michigan own some property and I'm going to suggest they build at least one cob building on it.

There are some underground homes in Ohio and Michigan that have cob molded around the exposed entrances and skylights. I will attempt to get some pictures of these. In and around Dayton Ohio, there have been underground office buislings, with perhsps the front 25% of the building exposed to light and using solar panels, etc, Hills were built around them. Very low utilities bills.

I've read a few comments on diswcussion baords about cob houses being "toasty" and warm in the winter and cool without air conditioning in the summer, especiialy if shaded propery with trees, etc. I have the sense that soil-sand-clay-straw cob is warmer than sand-clay-adobe in the winter from all of these comments, but I don't know, myself. Then there are comments and pictures in the books on cob architecture that show how rock-hard the soil-based cob becomes in the sun - as hard as sandstone and some other rock. This could likely be sanded to smooth its rough surface.

At any rate, I think I want a cob home now, too.

Thanks so much for posting.

C.S.Alexis from NW Indiana on May 11, 2008:

Patty, these structures almost invite you to move in ASAP! I know there is something to the flowing lines and the good energy, like waves of peace flowing in the wind. It is perfectly lovely, natural and elusive, sorta like following a winding river or road and you just keep going and you know in your heart that it will be right around the next bend, harmonious! Thank you for this hub. Nice!

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 11, 2008:

I agree, CS Alexis, and they look strong and durable as well. Many people say they feel a definite good energy when they walk into these dwellings.

C.S.Alexis from NW Indiana on May 11, 2008:

Do love the simple and soft lines in these structures. They feel very warm and inviting.

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 10, 2008:

Chef Jeff! - I wonder also what the building inspectors would say. The house in Knox County Ohio passed OK. Counties across the nation are different about this, I'm sure.

Patty Inglish MS (author) from USA and Asgardia, the First Space Nation on May 10, 2008:

Thanks for all the comments! Just to clarify my sources --

I have a contact that is an archeologist working in Egypt - they have indeed found bricks in some pyramids made of mud, straw, sand and clay. Not molded like cob is molded - dried into large bricks, but still of the same materials.

Adobe - I have RN friends in New Mexico that state adobe in their locale is very much made like cob - no mortar.

Chef Jeff from Universe, Milky Way, Outer Arm, Sol, Earth, Western Hemisphere, North America, Illinois, Chicago. on May 10, 2008:

The first picture reminds me of the House of the Future they had at Disneyland back when I was a kid, with the rounded arch & smooth surfaces. I wonder how well this would go over with our local county building inspector folks, who seem to believe that a house can only be built of wood & plasterboard.

Great hub, and, I hope to read more about this and other construction topics.

ahmu on May 10, 2008:

nice hub u make i like it

Eileen Hughes from Northam Western Australia on May 09, 2008:

I saw an article on tv the other night where a house was built from polystyrene. Its amazing what can be done these days. Very interesting hub Thanks Patty

Rob Jundt from Midwest USA on May 09, 2008:

Fun hub. Great links. Thanks.

Bob Ewing from New Brunswick on May 09, 2008:

This is an excellent resource, thanks.

Zsuzsy Bee from Ontario/Canada on May 09, 2008:

Patty! I must look into this type of building. I could do that. I like it a lot. Research here we come.

Thanks for giving me a great idea.

awesome hub as always regards Zsuzsy

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