Cob Building – Off the Treadmill

This movie is entitled “Off The Treadmill” and is about getting out of mortgage debt by using the very ground we stand on to build our own homes. “It’s dirt cheap”, says Ianto Evans, master cob builder and architect at Cob Cottage in Southern Oregon. This film was created by Chris Tilt.

Earth is still the world’s most common building material. The word cob comes from an old English root meaning a lump or rounded mass. Cob building requires the use of hands and feet to form lumps of earth mixed with sand and straw. This is a sensory and aesthetic experience similar to sculpting with clay. Cob construction is easy to learn and is inexpensive to build. Because there are no forms, ramming, cement or rectilinear bricks, cob lends itself to organic shapes: curved walls, arches and niches. Earth homes are cool in summer, warm in winter. Cob’s resistance to rain and cold make it ideally suited to cold climates like the Pacific Northwest, and to desert conditions.

Hap and Lin’s Cob House Journal

In the fall of 2007 my wife Lin and I gave up our condo and pitched a tent in an Iowa field to live immersed in nature and without debt.

The tent was soon flattened by a thunderstorm and replaced with a tow behind camper that we picked up on ebay for $700. Even with a tiny woodstove, the camper wasn’t up to an Iowa winter so we journeyed to Oregon where the summer before we had done cob building workshop with Ianto Evans and Linda Smiley.


Cob is an ancient building method that combines clay soil, sand and straw in a free form, frameless structure. The typical thatched cottage of southern England was built with cob and Ianto, a 70 year old Welshman, has led the cob revival. The book he wrote with his wife Linda and Michael G. Smith is aptly titled, The Hand-Sculpted House. Modern cob structures often take full advantage of cob’s sculptural possibilities with curving walls, dragon reliefs and frog mouth pizza ovens.

When Lin and I returned to Iowa early in the spring (actually, a little too early), we started digging a foundation for our own cob cottage. We had no intention of trying to stuff all our activities into a small house. By this time we had built an open shed out of recycled wood and roofing to house a summer kitchen, outdoor shower and workshop. We had no desire to move indoors but we didn’t want to be forced to travel all winter either. So we designed a 14 by 18′ winter room with a high pitched roof to give us a sleeping loft.

Our photo website has details of our building process. In Iowa the subsoil is high in clay, great for building but not good for drainage. Our gravel foundation drains to daylight as does a curtain drain around the high side of our building site. After starting the walls with old concrete and limestone, cobbing began on June 1, 2008. For the next 10 weeks our days began with muddy feet as we mixed our house, batch by batch on tarps. Many new friends would be made doing the cob dance. This must be the most low tech way to build a permanent structure. Whole families joined in and even two year toddlers were able to contribute.

By the end of August the roof was on and we were no longer losing sleep trying to keep our cob covered from the Iowa rains. After another two months of plastering and doing the cob floor, we moved in, just in time to crank up the woodstove. We spent $7,000 on the house and none of it was for labor. Most of the money went into the windows and roof system.

In the “developed” world, houses are made to be plugged in to existing infrastructure. The modern house doesn’t function without connections to water, sewer, electric power and often natural gas. This dependency on infrastructure strikes me as a huge risk considering the current potential for environmental and economic changes and to say nothing of Murphy’s law. In our little house we filter rainwater for drinking. We heat with scrap wood. Our electricity comes from a small photovoltaic system. Our only connection to anything is a phone line. Because our lifestyle is a small step away from camping we are quite content with our minimal facilities.

Tiny houses will play a big role in creating a sustainable future for mankind on earth. Almost half of our countries carbon footprint is caused by the manufacture and maintenance of our structures. For Lin and I, the tiny house is part of our goal to live cooperatively in nature. Based on the hundreds of people who have visited and helped with our construction, this is clearly a shared vision.

We are coming to the end of our second building season on the land. Two more houses have sprung up. One is a strawbale house that we are helping to build for my folks with Brad Young the paid main builder. The other is a 14×14′ bedroom/house that we are building with our daughter Anna. This bale/cob hybrid will have a living roof and will cost half as much as our house. The wall building that took 10 weeks with our cob house took one week with Anna’s bale/cob. The bales in the walls will have a much higher insulation value than straight cob. Anna will use her grandmother’s kitchen and bath, another example of sharing and saving.

By Hap Mullenneaux for the (Tiny House Blog)

Cob Loft Bed

Cob Loft Bed

Cob House Kitchen

Cob House Kitchen

Wood Stove and Stairs

Wood Stove and Stairs

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Recipe for Building a Cob House

Over the past nine months we have been following Brian or Ziggy as his friends call him build his cob house. You can check out the last two posts on the build here and here.

Ziggy emailed me Friday night to tell me he has completed his home and moved in and has set up a page with a recipe for building a cob house on his blog. Here it is in a nut shell:

With $3000 for supplies and nine months of full time labor, Ziggy was able to build GOBCOBATRON, a small cob house with interior dimensions of roughly 15’x13′, and a footprint of (again, roughly) 20’x18′. Practically all of the labor was completed by hand (and foot!), including making and applying all of the cob.


Here’s what Ziggy actually bought, and what he paid for in building supplies:

  • sand (just over 30 tons total) – $507
  • gravel (about 13 tons total) – $177
  • straw (16 bales) – $36 (most straw I used was free)
  • black walnut scrap lumber – $100
  • misc. lumber – $20
  • windows – $220 (two casement, one double hung window)
  • electrical – $28
  • galvanized wire – $30
  • nails – $100 (I couldn’t believe how expensive nails are)
  • raw linseed oil (for floor) – $72
  • EPDM pond liner $622
  • polycarbonate for skylight $400

and for the rocket stove:

  • firebricks – $70
  • flue pipe – $228

It’s true… you can build your own cob house with little money, but with lots of time and enthusiasm. There’s nothing quite like the experience of building your own home with little more than your hands.

Visit Ziggy’s blog for the complete story.

Thanks Ziggy for sharing your journey with us in building your cob house.



by Kent Griswold (Tiny House Blog)

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