Saturday, July 04, 2009

More Rammed Earth In Israel

Dan Mouyal of Adama Construction presents another spectacular rammed earth project.























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Wednesday, June 10, 2009

Is this the UK's Eco-Shed of the Year?


Michael Thompson has finished his rammed earth garden shed!


He's hoping it will be voted the UK's Eco-Shed of 2009.

Click here if you would like to vote. Best of luck to Michael!

Monday, May 11, 2009

Aaron Hauser's Book Scans and Rammed Earth Baking Studio Project

Aaron Hauser in Tennessee is starting work on his first rammed earth building, a Baking Studio. In order to educate himself on the process he read the following classic out-of-print rammed earth books which he has made available to download from his web page. The numbers in brackets indicate the page count.

Farmers' Bulletin No. 1500: Rammed Earth Walls for Buildings(26)

Booklet issued by the US Department of Agriculture in the 1920s regarding rammed earth construction. It is undetermined how many homes and other structures were constructed pursuant to this Bulletin and how many are utilized today.

S.W. Johnson's Rural Economy: A Treatise on Pise Building(88) pub. 1806

Influenced by the works of Francois Cointeraux, this is the first book published in the United States regarding rammed earth construction, and it is an instructional guide for individuals interested in rammed earth, or pise de terre, construction. Note the dedication to President Thomas Jefferson, a supporter of rammed earth construction who visited Mr. Cointeraux in France prior to becoming President.

Karl Ellington's Modern Pise-Buildings (109)

Not sure why the cover photo isn't showing up, but you can click the link to see the photos.

Three cheers and best of luck to Aaron!



Wednesday, February 04, 2009

UK Rammed Earth Building Course

Tuesday, January 27, 2009

Rammed Earth Chicken Coop In Austin, Texas

I came across this rammed earth chicken coop while flickr-ing around last fall and asked the rocking Mr. Cliff White to share his construction experiences with fellow rammed earth enthusiasts.

Where is this project?
This chicken coop is located at my son's school. Part of their curriculum is gardening; I offered to build one to allow them to keep 24 chickens.
http://www.austindiscoveryschool.org/


Why was rammed earth used?
I've built a shed and a retaining wall; this gave me an opportunity to refine my skills in rammed earth. That said, rammed earth is durable, cheap and beautiful. It's very forgiving and practically anyone can build with it. In keeping with the vision of the school, it was a natural choice.


How thick are the walls and what size is the structure?
It's 9 ft x 15 ft. The walls are the same width as concrete block: just over 7.5 inches. This is extremely thin I know but since I was not so much concerned with the thermal flywheel effect as being inexpensive and quick (less material and less time ramming more material). I used concrete block in an effort to quickly build a stem wall and that was the width of the block. My utility shed in my backyard has stood for about 3 years with no problems using the same width.There is no reinforcement in the walls.


How did you attach your doors and windows?
The windows were built in place - I don't recommend it. Sure for a chicken coop it's fine but they were not square. I used scrap wood to make a volume displacement box (as described in Easton's book) but instead of removing them, I simply left them in place (I put screws through the boards before ramming to make sure they were secure). Using these 'gringo blocks' - in Adobe parlance - I attached 1/4 inch hardware cloth and nicer trim wood to make "windows". This serves a dual purpose: allow the kids to view the chickens when they are not in the yard and, more importantly, air out the coop!
The door was built from scrap 2x4 lumber culled from disassembling the forms and walers.
I attached hardware cloth to the frame and voila! The door! The door jamb was made from (somewhat warped by then) wider walers attached to the rammed earth wall using concrete screws. I had to use many of these to provide enough friction to secure it.



What was your forming system?
One corner form made from plywood, 2 x 6 and 2 x 4.
One straight form from the same materials.
I used 3/4 inch black iron pipes and pipe clamps.
The corner form, straight form, pipes and clamps were like the ones described in David Easton's "The Rammed Earth House
"


How did you finish the top of the walls and attach your roof?
I poured a bond beam -not very well I must admit. Like I said above, rammed earth is forgiving. More so than I am! I used metal angle brackets and concrete anchors to secure the wooden roof to the bond beam.


What type of equipment did you use?
I used a 4in x4in x about 3' piece of lumber attached to a 3 ft long 1 inch diameter steel pipe. For corners, I tamped with 2x4s or whatever was available and many work gloves. I used a concrete mixer to mix the cement, dirt, and water. Five gallon buckets were used to lift dirt into the forms.
Since I was trying to do it on the cheap, I did not rent a backfill tamper and air compressor. The tools would have cost greater than $100 a day. I believe it cost much more in time; if I did it over, I'd spend the money on lumber to create a single form encompassing the project and rent the power tools!


How did you come up with your mix?
A few years ago when I was making adobe, I tried out different mixtures here at my house. I found the nearest quarry has at least two mixes that work. I performed 'field tests' suitable for adobe blocks and the data gathered from my 3 years standing structures in my yard.
So now, I can simply have the dirt delivered if I doubt the integrity of on site dirt.
I admit that this was the most daunting task for all my rammed earth endeavors. I had no experience with knowing how good was 'good enough'. I was very cautious at that stage; once one works enough with soil mixtures one gains confidence. For instance, I can tell if a mix has too much silt by the sound it makes when I rap my knuckles on a test block! That took a lot of knuckle rapping and drop tests though!


How long did it take to build the walls?
I found I could mix, and tamp about 6 hours a day (on the weekend). I believe - and it's at least reasonably close - it took 20 minutes to collect and mix, and 20 minutes to tamp 3 five gallon buckets. On occasions when my wife mixed for me, it cut time in half and allowed me to labor longer.

I work full-time and was playing in two bands, so my time was limited to weekends and a vacation. Some injuries and inclement weather pushed this project to two years! My wife estimates 160 hours with 60% of that time was me working solo.

Knowing what I know now I'd:
1) Build a single monolithic form - or cost prohibiting - as large as possible. Forget modular as much as possible. My time and enthusiasm are more valuable!
2) Use tamper and compressor and at least one concrete mixer
3) Take two weeks off from work to prepare foundation and build the form and have dirt delivered.
4) Use a whole day on the weekend (not the whole weekend!)

I believe after the the form was up and secure, actual mixing and tamping using just my wife and me could be done in four days - four saturdays. But I haven't used the tamper so it's a guess.


Watch Out For The Farting Clown

Monday, October 27, 2008

Rammed Earth Eco-Shed in Norfolk

I came across this video on youtube and had to know more about this project.


When and where did you first hear of rammed earth?
I first heard about it in January this year, it was used as an internal feature wall on a "Build an Eco House in 7 days" TV programme here in the UK. The house itself was primarily timber frame and straw bale, but this feature wall was amazing... I had to have a go!
What was the first rammed earth building you ever visited?
The first rammed earth building I visited was my own! I live in the UK, the chances of you being able to visit a rammed earth building are slim... The Eden Project has a rammed earth visitor centre but that's 6 hours drive for me.
What motivated you to build with rammed earth and not another building method?
At first it was the appearance of the finished walls, then when I realised it was dirt cheap it became the cost, now having single handedly rammed the walls I would say it's the connection with the earth as a building material.. it can be quite a humbling experience at times.
Is there rebar ( steel re-inforcement) in the walls?
I looked at how the Indian communities contructed single storey buildings and decided not to bother with any rebars. I have however added an additional "bond beam" between the roof joist to tie the roof joists together from each side of the 5 degree flat roof.
How did you come up with your soil mixture?
I used a "Soil Triangle Diagram" that I found on the internet, analized my own soil from the footing excavation by using a coffee jar full of water, then you add your soil sample, shake for one minute and the leave on a flat surface for 24 hours, you can then see how the soil has settled. I needed more clay silts so I imported 13 tons of sub soil from 6 miles away near the coast. I then used my invention "Sid the Soil Sieve" to grade the earth down to 12mm 0r 1/2 inch Once blended with 5%-8% cement they appeared to make the perfect soil for ramming.
Any idea of your material costs?
This is a 66m2 building with a maximum height of 2.8m, the budget for the raised footings, additional earth, roof structure and the soon to be planted out Green Roof is a mere £2,700.00 and I'm on track to achieve this budget. Notice that I am building a shed, not a dwelling, and so this was a project on a very tight budget... Pound Zero as I call it. I am a Joiner by trade and work within the building industry, so I see a lot of waste and over-engineering, this shed is just a single story building, and so the need to spend a lot of time and money was not required in my opinion... time will tell if it stands the test of time!
How long did it take to ram the walls?
It takes me about 3 hours to ram each section, each coffin former hold 200mm X 2000mm X 500mm of rammed earth so based on that you could say that it would take 15 hours to ram 1 cubic meter by hand.My Eco-shed has 60m2 of walls so it should take me about 180 hours to ram. But you can double that twice over when you add in the sieving and mixing of the earth, setting up the formers and fighting the elements etc.
Is there any insulation?
I didn't bother with the expense and extra work of insulation, the walls are too thin for starters (only 200mm or 8" thick) and this building is mainly going to be used as a garden kitchen and storage area. Also where I am the weather is pretty good, we have the lowest rainfall in the UK and the winters are mild by comparison the the rest of the country.
What would you do differently next time?
After spending three months researching and many hours designing this building to the last detail... even making scale models, I think that I have got this pretty much nailed down, maybe in a year or so I will see some areas of improvement, but so far I am more than happy with the results. I myself have found the whole experience has made me think a lot about rammed earth construction, so much so that I have decided to write an eBook information manual on building Rammed Earth Sheds this winter... watch this space for more info.

Tuesday, October 21, 2008

Rammed Earth in Modoc County, 1942

This post comes from Flickr member Ken Pollard.

In the early 1940s, my father's parents, Ken and Phyllis Pollard, bought 80 acres about 7 miles south of Alturas, California, next to the Telephone Company's transmission station. Ken worked for the phone company. Alturas is a small town in high-desert country of Northeastern California, and is the first town I remember living in; I was born in 1957. The town’s population was about 3,000 and isn't much bigger now. Alturas is the county seat and the largest town in Modoc County. I can remember when the road out to their house was paved, so that must have happened the early 1960s. The next closest building, a house, was about 2 miles away. On a still evening, you could hear the ‘neighbors’ talking outside their home, 2 miles away. Not distinct, but you could hear voices. It was pretty quiet out there.They built their home of rammed earth in 1942. The first photo shows construction of the house looking just west of north.

You can see my grandfather standing on top of the north wall of the house, tamping at the dirt in a temporary form; he's the figure on the left. Ken had discussed rammed-earth and adobe construction with a professor at the University of California at Davis, so he knew something about it. During construction, they moistened the soil until it would just form a ball when squeezed by hand. The earth for the construction came from the site. They would shovel a six-inch layer of soil into the form, and pack it down to three inches with a large steel tamper, shovel in another six inch layer, and so on. When the form had been filled, it was removed. They could stand on the walls right away. Once, they found that one wall by the front door was crooked. Even though it had just been built, it wouldn't push over; Ken had to take a double jack to it, knock it down, and rebuild it.This wasn't easy work. Phyllis said she thought the blisters she earned building the walls would never go away.They did all the building themselves. In 1989, Phyllis wrote me: All the wood in our home -- bathroom, kitchen, closets, etc. -- was red pencil cedar (not the fragrant) milled in Adin -- 19 miles S.W. of Alturas -- and it is not the cedar that grows throughout Modoc County. Ken just finished it with hot linseed oil and it was beautiful.The second photo is a view looking just south of west; the two figures are atop the same section of wall.

The back walls were full-height rammed earth, while the east and west sides were 4 feet tall. The upper part of the east and west walls were glass. They seemed a lot taller than 4 feet when I was a little kid in the early 1960s. The south wall, which will show better in another photo, was nearly all glass, with a planter area inside.The angled wall in the front of this second photo is the greenhouse area. It was accessed from inside the house, and was full of all sorts of ferns and other exotic (to me) plants. When I saw them in the early 1960s, the panes were somewhat coated on the inside by algae or green mold from years of high humidity. One day I climbed up on that angled portion of the wall, and was sitting up there when my grandmother drove in. She was not happy with me, worried that I might fall through the glass. I felt perfectly safe, as the wall was wide, but was very unhappy to be caught.This is another view of the house, looking west.

Taken a bit later in the construction than the last photo, I think it more clearly shows the greenhouse wall as well as the half-walls on the east-side of the house. On the back of this photo, in Phyllis' handwriting is "Home on Westside Rd. 7 mi. South of Alturas. Under construction."The second photo shows the reverse, that is from the inside looking towards the east.


You can see the half-wall at the right side of the photo. It was glass and post above that when finished. Ken had narrow shelves there, and his extensive collection of telephone-pole glass insulators on display there. The two doorways are the exit, on the right, and the door to the greenhouse on the left.This photo shows the 'front' of the house; we're looking north.

You can see the greenhouse area at the right. My grandfather is standing in front of what will be the glass windows. You can see the long overhang of the roof. In the summer, the wall of glass panes was in the shade, while in the winter, being at a lower angle, the sunlight could come in and help heat the place. Modoc County is cold in the winter, occasionally beating out Alaska for the nation's cold spot.The south wall had floor to ceiling green-tinted windows that looked out over a large grass lawn rimmed with a hedge, sage brush beyond, and mountains in the distance. Inside, next to these windows, was a floor-level planter box, filled with exotic (to me) tall plants. I don't know what they were, but the some of the leaves were big and jagged. In a letter dated 08 January 1989, Phyllis writes --The indoor garden had Gardenia, Bird of Paradise, Camellia, Azalea, Begonias, Rabbit's Foot Fern, and, in a 1 ft. dia. Cedar Bark planter, from floor to ceiling-Stag Horn Fern and Split Leaf Philodendron.When I was a child, I didn't think anything of being warm in a room with a wall of floor-to-ceiling windows, but after I grew up and was out on my own, I wondered about their heating bills. I knew they had a furnace and a fireplace, and concluded that they just burned a lot of fuel. In June 1989, Phyllis told me these windows were 1/4" heat-absorbing glass plate, which explained the green tint and southern exposure I remembered. So, starting in 1941, my grandparents used solar energy to help keep their house warm. Phyllis also told me that during some of the wind storms those glass-plate windows would bend in and out, sometimes as much as six inches in the center of the plate.There was a large, 50-gallon built-in fish aquarium on the inside wall opposite the picture windows. The face of the aquarium was flush with the living room wall. I remember feeding the fish. You had to go into their bedroom and enter a closet door. In this access, the top of the tank could be opened and the fish food poured in. Later, Ken put the gold fish out in the horse trough were they grew to a large size, and they were able to survive freezing solid in the winter.Ken built a large stone fire place in the living room. It was open on the left hand side so that long pieces of wood could be fed into the fire box as they burned. This eliminated the need to chop wood to very short, firebox-sized lengths. A round metal post supported the left side of the mantle.On the southwest corner, near the fireplace, the wall further extended about 6 feet further south, to protect the picture windows from the wind. When this extension was built, Ken took his .22 rifle and fired a shot at that wall. The bullet didn't penetrate.The view from those large windows is shown in the next photo.


My grandmother's notation on this photo reads: "Southwest from house -- Westside Rd., Alturas" so the photo is taken at somewhat of an angle from the house. I think. I'll stick with my sense of direction, since that's how I think of it, and it makes the house layout easier to understand -- but I might be wrong. The last time I was there, I was 11 or 12. I'm now 51 (2008).