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How I Made My Cob Chicken Coop (in 15 photos)

3/11/2020

8 Comments

 
Yay! The cob hen coop is finished. There's even a bit of grass growing on that roof. So here it is: How to make a smallish (1.5m diameter) cob chicken coop, including a living roof and limecrete floor (yes my hens live in style).

Note to all the folk who love to read this stuff, but never do it: This is the one time you should quit the procrastinating, and just give it a go. A cob coop/kennel is perfectly doable alone, it costs basically nothing, and you don't need a permit for it. That's it. I've just set a match to all your excuses:) No garden? Make a small cat house in the park or something! An animal shelter is a super way to practice using cob. It’s basically a miniature version of a house, so you get to try out all the techniques on a manageable scale before committing to a more ambitious structure. Yup, it really is time to get your hands dirty!
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Foundation.
First, dig a small trench/circle for the foundation. This is a hen house, not a castle, so it really only needs to be 10-20cm deep. Fill it with nice fat rocks. Then fill in the gaps with smaller rocks.
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Gravel.
Adding gravel over the top isn’t strictly necessary, but it fills in all the tiny gaps and creates a nice flat surface to build on. This is especially useful if you’re adding a limecrete/earth floor.
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Cob.
Mix up some cob. I used roughly one part clay, one part soil, one part straw, some horse manure ,and two parts sand. But each person’s mix is different, so test it. If you want to be very professional and master the art of clay plaster and cob, take a look at my Perfect Earth Plaster Course.
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Limecrete and earthen floor.
Now add another ring of rocks for a stem wall (to raise the cob off the ground so it is protected from rainwater runoff). This is an important feature with all mud buildings, so don’t skip this part unless you especially like watching cob disintegrate in water.
 
I wanted to test out both a limecrete and earthen floor in my climate, so I made the chicken coop floor half and half. I also wanted to test out whether a vapour barrier was a good idea or not. Hence I laid some plastic between the gravel and the mixture in one half of the coop, but slapped the mixture straight down onto the gravel on the other half. Now that I’ve seen how it functions, I think these natural floors work much better without the vapour barrier (others disagree). What I’m seeing is, the half of the floor where I stuck the vapour barrier doesn’t dry out properly because the damp can’t evaporate.
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Building up the cob walls.
Take your cob mixture and slap it on top of your stem wall to create your first mud layer. Wait for this to dry before adding the next layer on top. In my climate (damp) I found I could lay about 30cm (height) of cob mixture at one time, after which it began to buckle.
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Attaching door frames. Make sure they’re anchored in.
Add your door frames wherever you want them. These need to be properly anchored into the cob mixture. You can see from the photo how I created small lintels above and below the door, which extend into the cob. These were nailed into the cob mixture below. I also added nails (see the red lines) into the side of the door frames so the cob has something to stick to.
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Keep building up and around the frames until they’re completely embedded into the structure.
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Prepping for the roof.
Once you reach the top, add some ‘wall plates’ for your roof to sit on. Again these should be anchored into the cob. I nailed mine in.
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Interior.
Before the roof goes on (if it’s a smallish coop), sculpt the inside. It’s a lot easier this way.
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Add joists.
Add your roof joists. I used bits of old wood I had laying around. Make sure they’re level, and that the roof is sloping gently from front to back.
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Cover the roof.
Use some sort of roofing board to cover the joists. Cut it to the shape you want and screw it in place. Then add a water proof membrane of some kind. You can add hens as well at this stage, if you want.
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The rim.
Attach a rim to the edge of the roofing board to create a kind of tray for the dirt to sit in. In this case I used skirting board, but hey, use your imagination and whatever you have to hand.
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Drainage.
Remember to add mesh at the back so that water can drain out.
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Root barrier.
For a living roof you need a root barrier. Bitumen based membranes, Onduline, or roofing felt won’t be enough because roots will soon eat through them. Sadly plastic is the only way here (as far as I know).

Normally on a human house you’d want a drainage layer here (see how to make a living roof here).
​
Because this is a tiny hen coop, I didn’t bother with that and stuck the dirt straight in.
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Tidy up the edges, and away you go!
See the hen coop on Youtube
In about six months the roof should be green. But in the meantime, the hens are happy and snug.

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8 Comments
Erin Holland
23/3/2021 10:38:55 am

This is amazing!

Reply
Atulya
21/1/2022 10:51:35 pm

The hens like it that's for sure:)

Reply
NinaHedlund
21/1/2022 01:50:13 pm

I really like the idea! How does one clean it though?:)

Reply
Atulya
21/1/2022 10:51:01 pm

Yes, a few people asked that, and I was so confused as to why. But here's a video explaining that (and other things).
https://www.youtube.com/watch?v=7FMnnGItb94
The cleaning part is at about 3 mins in.

Reply
Jemma Warren
22/2/2022 04:21:03 pm

In the pictures I can see there's some limestone (I think?) in between the upper stone layer is that right?
Also do you have to wait for the cob to dry before attaching the wooden roof joists?

Reply
L
5/8/2022 08:40:18 pm

How on earth do you get the eggs out?

Reply
Tori Rowland link
21/6/2024 08:43:26 am

Thanks greeat blog post

Reply
gnana prakash
14/12/2024 04:15:29 am

I am happy to know about your method, and thanks for sharing your knowledge. Tough a small structure, it is brilliant.

Reply



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  • Home
  • Building
    • Earthbag >
      • Rubble Trench Foundations
      • Earthbag in Extreme Weather
      • Earthquakes and earthbag
    • Earth Plaster
    • Using Lime
    • Cob
    • Straw Bale
    • Wattle and Daub
    • Inspiration
    • Off-Grid Living >
      • Off-Grid Prep Course
    • Mud Building Blog
  • Books
    • Dirt Witch
    • Mud Ball
    • Mud Mountain The Book
    • MUD BUILDING PDF PACKAGE
  • About
    • Contact
    • Mud Home Facebook Group
  • COURSES
    • ATULYA's In Person Workshops 2025
    • Perfect Earth Plaster Online Course
    • Lime for Beginners Online Course
    • MUD BUILDING PDF PACKAGE
    • The Off-Grid Roadmap
    • Consultation
  • Blogs
    • Mud Home Turkey
    • Barn Life in Spain
  • My Projects
    • The Earthbag Home in Turkey
    • The Barn in Spain