Building A Cob House-Follow Up With the Mullenneaux's

In early November I wrote a post on "Building a Cob House" about the Mullenneaux family, and their personal cob building community story. The responses from readers were fantastic and inquisitive, so I felt a follow-up was necessary. I reached out to Hap and Lin Mullenneaux with questions readers had asked and how it felt to be living in their new cob house the past month. They happily obliged and also offered to serve as a contact for anyone else interested in cob houses. I hope you enjoy and learn from their responses as much as I did.

GB: With your cob home finished, how does it feel to be living in a home that you created solely with your own hands (and feet), especially with the help of Fairfield (Iowa's) supportive community?

HLM: We have been living in the house for one month. It feels more like a part of nature than a conventional house. As something natural, it is easy to accept it as it is. While there are some things that aren’t finished, we are beginning to realize that this house may never be finished because that is a static condition and this house is alive. We do look forward to running water inside and taking baths at home, coming as soon as the pond fills. Since summer ended we have missed our outdoor shower.

Loft Bedroom. The ceiling is bamboo matchstick blinds over reflectix. Photo Credit: Hap and Lin Mullenneaux

GB: What specific environmental benefits have you noticed in your new cob home?

HLM: In building this house we used much more “waste” than we created. Now our use of energy and water is a fraction of any house we have lived in before. We use rainwater from the roof. We heat with wood from the scrap pile at a nearby sawmill. Our total monthly housing costs are under $100, mostly phone and internet.

Cozy Kitchen-Photo Credit: Hap & Lin Mullenneaux

GB: In my previous post, I received a question regarding cob homes' flexibility and durability for various climates. Can you answer that comment, especially in light of Iowa's notoriously cold winters, wet springs and hot summers?

HLM: At this stage of our experiment the jury is still out. The season in question is winter. Cob walls give you excellent thermal mass. Heat them and they will radiate that heat back to you over time. But what happens when there is a sub-zero wind chill hitting the other side of the wall? Stay tuned!

GB: Are there any challenges you've noticed since moving in?

HLM: Balancing the heat was a challenge because we put the woodstove by the stairs. We are closing it in so that the heat spends more time downstairs. Condensation was an issue at first. We made the house very tight and there was still cob and plaster drying when we moved in. Add the vapor that we contribute from cooking, etc and you have high humidity. This is becoming less of an issue as winter progresses, but the interior plaster absorbs moisture easily and down the road we may cover it with something less permeable.

GB: So, if someone were interested in building their own cob home what insights, resources and advice would you give them and why?

HLM: In a climate with real winter you need to use every bit of the building season to finish a cob house before freezing begins. Keep the design small. Have the foundation and stem wall ready in the spring. Do the roof first on either permanent or temporary posts. We had to work hard to protect our walls before we got the roof on. Enjoy the process and encourage everyone to enjoy it with you. Cob is not meant to be done alone. To give cob a fighting chance in cold weather, do everything you can to help it. We made the house tight with good windows that are strategically located. We insulated the roof properly. We probably should have done more to insulate our stone stem wall. Keep the cob walls thick. In places where we sculpted seats or niches into the wall the thin wall tends to be cold and damp. Finally, don’t let heating be an after thought in a cold climate. Make sure you will have heat where you need it with proper placement of the woodstove or other heat source. Some folks who built a cob house in south central Iowa said that their home was a bit chilly when the woodstove was located on the north wall. The next winter they moved it closer to the middle of the house and were much more comfortable.

Be sure to get some hands on experience before you start your own project The workshop that we took at Cob Cottage was a blast. http://www.cobcottage.com/

Here are more great teachers we have met:
http://www.housealive.org/
http://www.emeraldearth.org/
http://www.cobincornwall.com/

We are happy to answer questions and share our experience via email: haplin[at]gmail[dot]com

Thanks for doing this, Grace.
Hap & Lin Mullenneaux

Building A Cob House

How eclectic, yet authentic does it sound to build your affordable dream home...with your hands and feet?
My close friend, Mani Mullenneaux's parents Hap and Lin have been doing just that. They've had "cobbing" parties, mixing earth from their own land in our hometown of Fairfield, Iowa (South East corner of the state) to create their sustainable and natural dream home. Their end result: 400 square feet including a loft bedroom. An article from The Iowa Source features Lin and Hap's journey through not only building their cob home, but the community they've built around it. I was home for a little this summer before moving to Colorado, and I almost went with Mani to help cob, so the story touched me on a personal level. Here are the highlights from the article, with my opinions and thoughts inserted throughout...

What IS a cob house?

"Cob building has been used for centuries in Europe but is relatively unknown in the U.S. In the summer of 2007, Hap and Lin journeyed to Oregon to learn cob building at the Cob Cottage Company, the home of Ianto Evans and Linda Smiley."

Lin in the early stages of foundation of the cob walls (Photo Credit: Hap and Lin Mullenneaux)

In knowing Hap and Lin, I can see how they seek to inspire others to build homes with natural materials through their own personal joy of building their own. "Part of the appeal for this kind of building is that it involves community,” says Lin, “when your friends and family help build your home.” My friend, Mani is the youngest of five in the Mullenneux clan, so with Hap and Lin's children, grandchildren and parents their family and 'cobbing' support has had great breadth.

Affordable living for today's economy

As of October the house has grown and is close to finish. There is a white lime-plaster finish, a green metal roof to catch rainwater and a periwinkle blue door.

“Hap wanted the door to be the color of morning glories,” says Lin. The morning glories have climbed to the top of the arches over the garden and Hap’s mother Dorothy and her husband Bill Beal have planted a beautiful garden of their own, next to the camper where they have lived this summer."

Hap's mother Dorothy and her husband, Bill enjoying the 'cob dance' (Photo Credit: Hap and Lin Mullenneaux)

I think the author, Linda Egenes does a beautiful job of describing the mystical cob, cottage of which I can't wait to see when I make a trip back home:

"But the cottage, the cottage. It’s a cozy, magical place, with a winding staircase to the wooden loft where the bed already rests, and two small baskets for socks and sleepwear are the only other furniture. Pine saplings, cut as dead wood by Hap from a nearby forest, form rustic beams downstairs. The partially plastered interior walls feel smooth and cool as stone. A wood stove sits in the northwest corner, cob benches create a window seat under the south windows."

The best part is that their unique home cost them only an estimated $7000 and half of that was in the windows and roof. Not only have they efficiently spent less on their new home but they are reaping the benefits of the sustainable lifestyle it will provide them.

“The experience of building this house was completely different than the home we built ten years ago,” says Hap. “I don’t remember feeling so vibrant at the end of the process like I do now. These materials are alive. With materials coming out of the ground, with labor coming from so many wonderful friends and family, it’s a tremendous blessing that we’ve received. It feels like a miracle."

Lin and Hap in their cob home (photo by Gabe Walker)

Here is the full article in the Iowa Source, "Building a $7,000 Cob House"
In addition, Hap and Lin are incredible photographers. Check out their site here as they created, "A Cob House Journal"