Do not turn your back on or ignore the future. For
like a speeding bus it could ruin your whole day. Instead
embrace it like a lover, with whom you are well pleased
to greet.
We do not know what the future will bring to our planet,
but whether doom and gloom or a bright new beginning
we would do well to take a look at possibilities. Plan
for the worse and live for the best.
Approved
Building Methods
This is not a bible of what we are looking
for, allow, or need. It is simply flavor of or
a look at what we would consider as welcome to
our Eco Village. There is a mechanism or process
to go through when looking to purchase a lot and
build in our community. It is not an arduous process
and is really just designed so that both you and
our members are comfortable with what is transpiring
in this impending relationship with our community.
Clearly, in a “Beyond Sustainable Eco Village”
that has a green flavor to it there are certain
ideas that dictate what we are aspiring to become.
This is a lush desert and stick built or wooden
frame homes are not particularly appropriate here.
You can try and convince the Board that your
project is different and that is why we do not
ever start with a "no you can’t do that"
attitude. You must convince us! So rather than
dwell on the negatives, let us look at what we
are likely to be impressed and inspired by.
This is from page one of this website
http://www.adobebuilder.com/
It is a good enough place to start if this
is of interest to you.
Welcome! You're here because of
your interest in building and owning an
earth-wall home. Your questions probably
center around, "will it work
in my climate? ", "can
I do it? ", "how do I begin?
" or "how much will it
cost? " This site exists to answer
these questions and to get you started.
Here are the main considerations...
THE CODES...Adobe is defined in
the current International Building Codes,
used across the United States. Individual
states, such as New Mexico, Arizona and
California, modify this code to fit their
building practices. Pressed Block and Rammed
Earth are generally included in these codes,
which can also be modified by individual
counties and cities. Adobe was often a ‘sleeper’
in previous codes, but with the new interest
in green building, bureaucrats and legislators
are eager to bring it forward and work is
underway to write it into ASTM standards.
So yes, you can do it, legally speaking.
In areas without codes, you have more freedom,
but you should still build to a recognized
standard. If your building department has
little experience with earth walls, they
may require that your plans be stamped by
a licensed engineer or architect. In many
areas of the Southwest, prescribed codes
allow you to build to a standard, without
a professional stamp. This is the case in
Arizona and New Mexico, and portions of
Utah, and Colorado. At present, Texas has
few restrictive codes, and California, the
most restrictions.
This is from the following website
where you can see pictures and learn
more. http://calearth.org
Superadobe (sandbag and barbed
wire) technology is a large, long
adobe. It is a simple adobe, an instant
and flexible line generator. It uses
the materials of war for peaceful
ends, integrating traditional earth
architecture with contemporary global
safety requirements.
Eco Dome
Long or short sandbags
are filled with on-site earth and
arranged in layers or long coils (compression)
with strands of barbed wire placed
between them to act as both mortar
and reinforcement (tension). Stabilizers
such as cement, lime, or asphalt emulsion
may be added. This patented and trademarked
(U.S. patent #5,934,027, #3,195,445)
technology is offered free to the
needy of the world, and licensed for
commercial use.
This concept was originally presented
by architect Nader Khalili to NASA
for building habitats on the moon
and Mars, as “Velcro-adobe”. It comes
from years of meditation, hands-on
research and development, and searching
for simple answers to build with earth.
It comes from the concerned heart
of someone who did not want to be
bound to any one system of construction
and looked for only one answer in
human shelter, to simplify.
Cal-Earth believes that the whole
family should be able to build together,
men and women, from grandma to the
youngest child. As such, we have spent
many years researching hands-on how
to make the process simpler and easier.
There should be no heavy lifting or
backaches, no expensive equipment,
and a flexible and fast construction.
The bags are filled in place on the
wall using small pots like coffee
cans, or even kitchen utensils. You
can build alone or as a group.
The structural principles
of the timeless forms of arches, domes,
vaults, and apses are built with the
materials of earth, sandbags and barbed
wire using the engineering of single
and double curvature compression shell
structures, to reach the ultimate
in strength, self-help, and aesthetics.
In Superadobe, the ancient earth architecture
of the Middle East using sun-dried
mud bricks is fused with its portable
nomadic culture of fabrics and tensile
elements, not just through design
and pattern, but through the structure
itself. Structural design uses modern
engineering concepts like base-isolation
and post-tensioning. The innovation
of barbed wire adds the tensile element
to the traditional earthen structures,
creating earthquake resistance despite
the earth’s low shear strength. The
aerodynamic forms resist hurricanes.
The innovation of sandbags adds flood
resistance, and easy construction,
while the earth itself provides insulation
and fire-proofing.
The Superadobe can be coiled into
vaults and domes, the way a potter
coils a pot, with barbed wire reinforcement,
to build structures which pass California’s
earthquake codes. These structures
can last for one season before returning
to earth, or they can be stabilized,
waterproofed, and finished as permanent
houses. The system can be used for
structural arches, domes and vaults,
or conventional rectilinear shapes.
The same method can build silos, clinics,
schools, landscaping elements, or
infrastructure like dams, cisterns,
roads, bridges, and for stabilizing
shorelines and watercourses.
Materials research on the
bags has shown that the majority of
existing bags of both natural and
synthetic material can be used. Natural
woven jute bags have not been used
by the architect because of toxic
chemical preservatives like formaldehyde;
instead, a synthetic, low UV (ultra-violet)
resistant degradable material has
been preferred. The bags or long tubes
are used primarily as temporary flexible
forms. In a temporary building, the
bags are allowed to degrade and the
building returns to earth. For permanent
structures, the synthetic bags are
plastered over to provide an erosion
resisting layer, or they can be removed
when the stabilized earthen filler
is cured. The barbed wire is four-point,
two strand, galvanized barbed wire
and is recyclable. The earthen materials
of clay and sand, with straw and water
which have been used to make traditional
sun-dried mud-bricks for millennia
are not always available, nor do those
most in need of a home have the time
to make blocks, dry them and store
them. By filling bags directly from
the land and reinforcing with barbed
wire, almost any earth can be used
and the speed of building is much
faster yet still in the hands of people.
Safety Standards and Comfort.
Cal-Earth’s sandbag structures,
reinforced with barbed wire, have
successfully passed tests for California’s
high seismic building codes, making
them resistant to earthquakes as well
as fire, flood, and hurricanes. Their
design and thermal mass create comfortable
living spaces based on the time-tested,
sustainable architecture of harsh
environments, such as that in the
architect’s native Iran.
“Superadobe is an adobe that is
stretched from history into the
new century. It is like an umbilical
cord connecting the traditional
with the future adobe world.” –Nader
Khalili
From Wikipedia - Rammed earth, also
known as taipa (Portuguese), tapial
(Spanish), pisé de terre or
simply pisé (French), is a technique
used in the building of walls using the
raw materials of earth, chalk, lime and
gravel. It is an ancient building method
that has seen a revival in recent years
as people seek more sustainable building
materials and natural building methods.
Rammed earth walls are simple to construct,
incombustible, thermally massive, very strong
and durable. Conversely they can be labour-intensive
to construct without machinery (powered
rammers), and if improperly protected or
maintained they are susceptible to water
damage. Traditionally, rammed earth buildings
are found on every continent (Antarctica
excepted), from the temperate and wet regions
of northern Europe to semi-dry deserts,
mountain areas and the tropics. The availability
of useful soil and a building design appropriate
for local climatic conditions are the factors
which favour its use.
Building a rammed earth wall involves a
process of compressing a damp mixture of
earth that has suitable proportions of sand,
gravel and clay (sometimes with an added
stabilizer) into an externally supported
frame, creating a solid wall of earth. Historically,
stabilizers such as lime or animal blood
were used to stabilize the material, whilst
modern rammed earth construction uses lime,
cement or asphalt emulsions. Some modern
builders also add coloured oxides or other
items such as bottles or pieces of timber
to add variety to the structure.
A temporary frame (formwork) is first built,
usually out of wood or plywood, to act as
a mold for desired shape and dimensions
of each wall section. The frames must be
sturdy and well braced, and the two opposing
wall faces clamped together, to prevent
bulging or deformation from the high compression
forces involved. Damp material is poured
in to a depth of between 10 to 25 cm (4
to 10 in), and compressed to around 50%
of its original height. The compression
of material is done iteratively in batches,
to gradually build up the wall to the required
height dictated by the top of the frame.
Compression was historically done by hand
with a long ramming pole, and was very labor-intensive.
Modern construction can be more efficient
by employing pneumatically powered tampers.
Once the wall is complete, it is strong
enough that the frames can be immediately
removed. This is necessary if a surface
texture (e.g. by wire brushing) is desired,
since walls become too hard to work after
about an hour. The walls are best constructed
in warm weather so that they can dry and
harden. Walls take some time to dry out
completely, and may take up to two years
to completely cure. Compression strength
increases with increased curing time, and
exposed walls should be sealed to prevent
water damage. In modern variations of the
method, rammed earth walls are constructed
on top of conventional footings or a reinforced
concrete slab base.
Underground homes or earth-sheltered homes
as some call them lie mostly beneath the
ground's surface. These houses are inexpensive
to heat and cool since the surrounding soil
acts as natural insulation. Those who design
underground homes have come up with several
methods for regulating the temperature.
Underground homes (at least some) depend
entirely upon the insulation provided by
the soil surrounding walls and floors. Others,
however, have tubes channeled through them
to bring in fresh air. Still others use
a heat pump to regulate temperatures.
Most underground homes are made of concrete
and one can expect to pay 10-percent more
for construction of these earth-sheltered
homes than a typical home. Enthusiasts say,
though, that at least 10-percent or more
is saved from lower maintenance and energy
costs. Underground homes are not suitable,
though for northern, permafrost regions.
The U. S. Department of Energy (DOE) agrees
with the energy savings of underground,
earth-sheltered homes saying, "If you
are looking for a home with many energy-efficient
features that will provide a comfortable,
tranquil, weather-resistant atmosphere,
an earth-sheltered house could be right
for you."
The DOE differentiates between underground
homes, which are almost completely underground
and earth-bermed homes which may have one
or two sides exposed, "A bermed earth-sheltered
house may be built above grade or partially
below grade, with outside earth surrounding
one or more walls. Such a structure can
accommodate more conventional earth-sheltered
house designs, such as elevational
and penetrational."
Some other advantages of underground homes
are lower insurance premiums, natural sound
insulation, less susceptibility to fire,
high winds, hailstorms and tornadoes to
name a few. Privacy is another issue stated
by underground home enthusiasts, which lured
them to build below the surface.
No matter whether you're a fan of underground
or earth-bermed homes, we have something
for you on this site. If you keep checking
back we may even surprise you with a few
things you hadn't anticipated as well. And,
we promise not to keep this information
underground. Did I mention that we're heavy
into humor around here... I know a few of
you who will dig that. Oh, the humanity!
The following is from the website www.monolithic.com
and here is info about this concept.
What are Monolithic Domes... They are super
structures!
Monolithic Domes are constructed following
a method that requires a tough, inflatable
Airform, steel-reinforced concrete and a
polyurethane foam insulation. Each of these
ingredients is used in a technologically
specific way.
Our domes can be designed to fit any architectural
need: homes, cabins, churches, schools,
gymnasiums, arenas and stadiums, bulk storage,
landlord dwellings and various other privately
or publicly owned facilities.
Monolithic Domes meet FEMA standards for
providing near-absolute protection
and have a proven ability to survive tornadoes,
hurricanes, earthquakes, most manmade disasters,
fire, termites and rot.
They are cost-efficient, earth-friendly,
extremely durable and easily maintained.
Most importantly, a Monolithic Dome uses
about 50% less energy for heating and cooling
than a same-size, conventionally constructed
building.
Beginning in 1970, Monolithic Domes have
been built and are in use in virtually every
American state and in Canada, Mexico, South
America, Europe, Asia, Africa and Australia.
Monolithic Domes are neither restricted
by climate nor by site location. In terms
of energy consumption, durability, disaster
resistance and maintenance, Monolithic Domes
perform well in any climate, even extremely
hot or cold ones. And they can be constructed
on virtually any site: in the mountains,
on beaches, even underground or underwater.
Earth sheltered homes became popular in
the 1970's when energy
efficient homes were in great demand
but they have been around for centuries.
The primary advantages
of an underground home are the energy savings
and superior protection from some of nature's
fiercest elements. (These earth contact
homes are billed as hurricane and tornado
proof but not completely disaster proof.)
Another big plus for earth sheltered or
underground homes is that they are very
earth friendly if built properly. Earth
berm houses are some of the most environmentally
or eco friendly homes on the market. On
May 14th 1974, Malcolm Wells came up with
"Underground America Day" and
it has been celebrated every year since.
A commonly voiced issue concerning this
style of architecture is finding an underground
house contractor. Below are some great resources
for earth friendly sheltered living and
green home contractors.
To date, a number of homes around the world
have actually achieved full annual heat
storage. That is, they collect absolutely
every drop of heating and cooling energy
that the homes need through long cold winters,
long hot summers and the rest of the year
too. They don't just reduce energy consumption,
they provide a surplus of energy that is
used to provide partial domestic water heating,
and provide natural power to run fresh air,
heat recovery, and ventilation systems.
This information is being provided to promote
the spreading of PAHS homes, to promote
energy conservation on a higher plane than
is usually done, and to direct people toward
the information needed to produce real and
positive results. Armed with a knowledge
of annual heat storage principles, you will
be able to have a part in advancing the
technology, and share in overcoming practical
building challenges. Make good use of our
easy access to publications, videos, and
plans, and be brought up to speed on PAHS
technology so that all may be benefited!
As the cost of living increases, people
everywhere are rethinking their needs for
affordable ways to live. Many homes become
huge financial burdens. A beautiful Earth
Sheltered Home can be affordable to build
and to maintain, working in sync with the
environment. That’s “green" - building
in support of the natural environment. That’s
sustainable living.
Our monolithically-poured system of walls
and ceilings is not only sustainable, but
it is stronger and more cost-effective than
any other green building system, including
wood-frame, steel-frame, ICF, cinder block,
tilt-wall, or poured-walls.
The following information is from the
website http://www.greenhomebuilding.com/
Please check that site for pictures and
further information as well as great links,
videos, books, and vendors
Cob is a very old method of building with
earth and straw or other fibers. It is quite
similar to adobe in that the basic mix of
clay and sand is the same, but it usually
has a higher percentage of long straw fibers
mixed in. Instead of creating uniform blocks
to build with, cob is normally applied by
hand in large gobs (or cobs) which can be
tossed from one person to another during
the building process. The traditional way
of mixing the clay/sand/straw is with the
bare feet; for this reason, it is fairly
labor intensive. Some of the process can
be mechanized by using a backhoe to do the
mixing, but that diminishes the organic
nature of it. Because of all the straw,
cob can be slightly more insulating than
adobe, but it still would not make a very
comfortable house in a climate of extreme
temperatures. The wonderful thing about
cob construction is that it can be a wildly
freeform, sculptural affair. I've seen some
very charming homes made this way. Cob was
a common building material in England in
the nineteenth century, and many of those
buildings are still standing.
A variant of cob is what is commonly called
"light straw/clay". This is made
with the same long fibers of straw which
is tossed like spaghetti with a sauce of
clay slip. The idea is to coat the straw
fibers with enough of the clay to get them
to stick together, but not so much that
it makes a gummy clump. This material is
then tamped into a form and left to set
up enough to remove the form. Light straw
walls could be useful for interior partitions
and even exterior walls if it is thick enough.
Such walls would be quite a bit more insulating
than cob, but they require a timber frame
of some sort because the straw itself would
not be load bearing.
Poured earth is similar to ordinary concrete,
in that it is mixed and formed like concrete
and uses Portland cement as a binder. The
main difference is that instead of the sand/gravel
used as an aggregate in concrete, poured
earth uses ordinary soil (although this
soil needs to meet certain specifications)
and generally uses less Portland cement.
Poured earth could be considered a "moderate
strength concrete." Little to no maintenance
is required of poured earth walls, since
they have a high resistance to the deteriorating
effects of water and sun.
Ideal soil is basically low in clay (something
ranging between silt to 3/8 inch aggregate).
Poured earth materials need to meet certifiable
engineering standards; appropriate testing
needs to be done to assure a quality product.
Testing should be done to determine shrinkage
and compressive strength in order to make
sure that the mix has very little, to no,
shrinkage and has a compressive strength
of 800-1200 psi. On-site soil can be amended
with off-site materials so that they meet
appropriate strength and durability standards.
When natural or synthetic fly ash and lime
is added to the poured earth mixture, the
amount of Portland cement required can be
reduced by up to 50%. Magnesium oxide can
also be used to help further reduce the
use of Portland cement.
Since poured earth is similar to concrete,
local suppliers can provide the product
which can then be pumped using traditional
concrete pump trucks. Standard concrete
forms can be used in preparation for the
pour.
It is possible to incorporate rigid insulation
within a poured earth wall, so that there
is a thermal break between the exterior
and the interior, thus allowing the interior
portion of the wall to serve as appropriate
thermal mass for the building.
Generally, poured earth walls increase the
overall cost of construction by 10% - 20%,
mainly because of the custom nature of the
process. When more homes are built, then
the economy of scale should make this method
competitive with traditional building.
A variation of poured earth that has been
around since cement was first formulated
is soil cement. This is a dry pack (moist)
earth/cement mixture which works especially
well with rather sandy soil, but will also
work with other soil types. The heavier
soils with more clay content will probably
require more portland cement. Soil cement
has been used to form walls, make floors,
pave roads, stabilize river banks, etc.
Here is some information about formulas:
Make it by mixing earth with Portland cement
to the desired depth, add water and mix
again. Tamp, and cover with plastic to let
it cure properly. Use 6 to 16 percent cement
by volume according to the density of the
soil. The denser the soil (clay, for instance),
the higher percentage of cement to use.
Six percent translates to 1 part cement
to 15 parts soil; 16 percent translates
to 1 part cement to 6 parts soil.
Building with earthbags (sandbags) is both
old and new. Sandbags have long been used,
particularly by the military for creating
strong, protective barriers, or for flood
control. The same reasons that make them
useful for these applications carry over
to creating housing: the walls are massive
and substantial, they resist all kinds of
severe weather (or even bullets and bombs),
and they can be erected simply and quickly
with readily available components. Burlap
bags were traditionally used for this purpose,
and they work fine until they eventually
rot. Newer polypropylene bags have superior
strength and durability, as long as they
are kept away from too much sunlight. For
permanent housing the bags should be covered
with some kind of plaster for protection.
There has been a resurgence of interest
in earthbag building since architect Nader
Khalili, of the Cal-Earth Institute, began
experimenting with bags of adobe soil as
building blocks for creating domes, vaults
and arches. Khalili was familiar with Middle
Eastern architecture and the use of adobe
bricks in building these forms, so it was
natural for him to imagine building in this
way. The Cal-Earth Institute has been training
people with his particular techniques, and
now the whole field has expanded considerably
with further experimentation by his students
and others.
I have taken Khalili's ideas of building
with earthbags that are laid in courses
with barbed wire between them, and come
up with some hybrid concepts that have proven
to make viable housing. Instead of filling
the bags with adobe soil, I have used crushed
volcanic rock. This creates a very well
insulated wall (about as good as strawbale)
that will never rot or be damaged by moisture.
As a covering for the earthbags I used papercrete
(see the papercrete page). This seems to
be a very good solution to the need to seal
the bags from the sun and the weather, without
necessarily creating a vapor barrier...the
walls remain breathable. Papercrete may
not be a good choice in warm and humid climates,
however, because mold could form on it.
Here is an example of earth bag home local
enthusiasts built. They maintain an extensive
blog Earth
Bag Building Blog and youtube earthbagwebsite
mylittlehomestead
(defaults to the video here).
Cordwood construction utilizes short, round
pieces of wood, similar to what would normally
be considered firewood. For this reason
this method of building can be very resource
efficient, since it makes use of wood that
might not have much other value. Cordwood
building can also create a wall that has
both properties of insulation and thermal
mass. The mass comes from the masonry mortar
that is used to cement the logs together,
and the insulation comes from the wood itself
and the central cavity between the inside
and outside mortars. Like strawbale walls,
many building authorities require a post
and beam or similar supporting structure
and then using cordwood as an infill, even
though the cordwood method creates a very
strong wall that could support a considerable
load.
This method produces a look that is both
rustic and beautiful. The process of building
is similar to laying rocks in mortar, where
the the logs are aligned with their ends
sticking out to create the surface of the
wall and mortar is applied adjacent to each
end of the log. Typically the logs are not
coated with a moisture barrier, but are
allowed to breath naturally. It is possible
to include other materials into the matrix,
such as bottle ends that would provide light
to enter the wall.
Recent experiments with the use of cob
instead of cement mortar to join the logs
have been encouraging and this method may
provide a somewhat more ecological approach
to cordwood building. In this case special
care should be taken to have large eaves
to keep water away from the wall.
After studying the wide array of "natural
building" techniques for several years,
I have come to accept cordwood as one of
the greenest of all: it uses what is often
considered a waste material, creates an
insulated wall that requires no further
finishing or maintenance over time, and
can be done by relative novices...what more
could you want?
The Earthship concept is the brainchild
of Michael Reynolds, who has written
several books on the topic. Near Taos
New Mexico, where he has his Earthship
Biotecture business, are whole communities
of earthships. The basic earthship
design incorporates substantially
bermed, passive solar architecture.
The primary retaining walls are constructed
with used tires, filled with earth
and stacked up like bricks.
The interior surface
of the tires is then plastered with
adobe or cement so the tires don't
normally show. Mike has also pioneered
the use of empty aluminum cans mortared
into lightweight, curvable walls.
Earthships often employ many ecological
concepts, such as water catchment
from the roof, reuse of greywater,
composting toilets, indoor gardening,
etc.
While some of the work of building
is simple to do, it also tends to
be very labor intensive. Furthermore,
the wood framing required is not simple.
Some of the earlier designs tend to
overheat, especially in the summer,
because of the slanted glass to the
south. I have seen some truly elegant
earthships, along with some that are
pretty funky. Engineered plans are
available that seem to please building
inspectors, as these have been built
in many localities.
Papercrete is a fairly new ingredient in
the natural building world. It is basically
re-pulped paper fiber with portland cement
or clay and/or other dirt added. When cement
is added, this material is not as "green"
as would be ideal, but the relatively small
amount of cement is perhaps a reasonable
tradeoff for what papercrete can offer.
I have had a fair amount of experience with
this stuff, and I would say that is has
some remarkable properties. Care must be
taken to utilize it properly, or you could
be courting disaster. I am acquainted with
both Eric Patterson and Mike McCain, who
independently "invented" papercrete
(they called it "padobe" and "fibrous
cement") and they have both contributed
considerably to the machinery to make it
and the ways of using it for building.
The paper to be used can come from a variety
of sources and is usually free. I've used
newspaper, junk mail, magazines, books,
etc., which I get from our local dump or
from the waste bin at our post office. Depending
on the type of mixer that is used to make
pulp out of it, the paper might be soaked
in water beforehand or not. My first mixer
used a small electric motor mounted directly
to a shaft with a couple of four inch square
blades on it, rather like a milk shake maker.
This shaft was suspended in a plastic 55
gallon drum where the mixing took place.
After a year of making small batches with
this, I graduated to a "tow mixer"
designed by Mike McCain. I consider this
to be the Cadillac of mixers because using
it is so
It is basically a trailer made from the
rear end of a car, with the part that would
attach to the drive shaft sticking upward
and a lawn mower blade attached to it. The
blade is surrounded by a large stock watering
tank where the mixing occurs. There is a
baffle on the side of the tank to force
the slurry back into the blade as it circulates.
With this mixer (which I tow behind my Volvo
station wagon) I can make three or four
wheel barrows full of thick papercrete in
about twenty minutes. I simply fill the
tank nearly full of water, add about one
wheel barrow full of dry paper, one sack
of portland cement, and perhaps some sand,
depending on how I plan to use the mix.
Then I drive slowly around the block, back
over a drain box with 1/8 inch mesh on the
bottom, and dump the slurry into the box
via a drain hole in the bottom of the tank.
After about a half hour of draining the
excess water from the slurry, the papercrete
is like soft, workable clay, but not nearly
as messy. This is the material that I used
to plaster both the inside and outside of
my earthbag house.
The slurry can just as easily be pumped
or dumped into forms to set up that way.
Eric Patterson makes adobe brick sized blocks
of papercrete to build with, and mortars
them together with a slurry of the same
stuff. Mike McCain prefers to either pump
the slurry into slip forms or make larger
blocks for building. The addition of mineral
material (sand, adobe, etc.) has the advantage
of minimizing the shrinkage as it cures,
making the final product more durable and
fire proof, at the expense of slightly less
insulating value and more weight.
Cured papercrete acts like a sponge unless
it is coated with something to stop the
entry of water. In my earthbag/papercrete
house I have allowed the papercrete to breath
fully, so that it absorbs an enormous amount
of water when it rains. This is not a problem
for me because there is nothing in the wall
that would be damaged by water, even if
it got past the papercrete layer, which
it rarely or never does. It is a whole new
concept for a roof: a sponge that welcomes
the moisture, and then simply give it back
to the atmosphere through evaporation. I
have had large cracks (up to about 1/2 inch
wide) in the initial layer of papercrete
on the earthbags, and still have not seen
any water getting through into the house.
Other properties of papercrete are:
1) It is dimensionally very stable both
through the process of taking in moisture
and drying out and in a wide range of temperatures.
2) It will hold fasteners to some extent,
especially screws, without cracking.
3) It is highly insulating (about R-2 1/2
per inch).
4) It does not support flames, but will
smolder for days if it does catch fire.
The more cement and mineral material that
is added to the mix, the more fire proof
it becomes.
5) It will support molds if it remains warm
and moist for too long.
6) It will wick moisture from the ground
into the wall if it buried in dirt.
7) It becomes soft and will deteriorate
if kept damp (especially underground) for
too long.
8) It resists rodent and insect infestation.
Paper adobe is similar to papercrete, but
instead of cement used to bind the paper
fiber into a solid, clay is used as the
binder. This can work well if the material
is kept absolutely dry; otherwise it will
become soft and could deform.
Lightweight concrete, weighing from 35
to 115 pound per cubic foot, has been used
in the United States for more than 50 years.
The compressive strength is not as great
as ordinary concrete, but it weathers just
as well. Among its advantages are less need
for structural steel reinforcement, smaller
foundation requirements, better fire resistance
and most importantly, the fact that it can
serve as an insulation material! It can
cost more that sand and gravel concrete,
and it may shrink more upon drying.
Lightweight concrete may be made by using
lightweight aggregates, or by the use of
foaming agents, such as aluminum powder,
which generates gas while the concrete is
still plastic. Natural lightweight aggregates
include pumice, scoria, volcanic cinders,
tuff, and diatomite. Lightweight aggregate
can also be produced by heating clay, shale,
slate, diatomaceous shale, perlite, obsidian,
and vermiculite. Industrial cinders and
blast-furnace slag that has been specially
cooled can also be used.
Pumice and scoria are the most widely used
of the natural lightweight aggregates. They
are porous, froth-like volcanic glass which
come in various colors and are found in
the Western United States. Concrete made
with pumice and scoria aggregate weighs
from 90 to 100 pounds per cubic foot.
The rock from which perlite is manufactured
has a structure resembling tiny pearls and
when it is heated it expands and breaks
into small expanded particles the size of
sand. Concrete made with expanded perlite
weighs between 50 to 80 pounds per cubic
foot and is a very good insulating material.
Vermiculite comes from biotite and other
micas. It is found in California, Colorado,
Montana, and North and South Carolina. When
heated, vermiculite expands and becomes
a fluffy mass, which may be 30 times the
size of the material before heating! It
is a very good insulating material and is
used extensively for that purpose. Concrete
made with expanded vermiculite aggregate
weighs from 35 to 75 pounds per cubic foot.
Concrete made with expanded shale and clay
is about as strong as ordinary concrete,
but its insulation value is about four times
better. Pumice, scoria, and some expanded
slags produce a concrete of intermediate
strength, but with even more impressive
value as insulation. Perlite, vermiculite,
and diatomite produce a concrete of very
low strength, but with superior insulation
properties; however these are subject to
greater shrinkage. All of these kinds of
lightweight concretes can be sawn to some
extent, and they will hold fasteners, especially
screws.
Lightweight aggregate should be wetted
24 hours before use. It is generally necessary
to mix lightweight concrete for longer periods
than conventional concrete to assure proper
mixing and it should be cured by covering
it with damp sand or by using a soaker hose.
The master sculptor/builder who created
all of the images in this section is Steve
Kornher, who is now living in Mexico. His
website, Flying
Concrete , describes more about these
pictures, and has many more of these amazingly
beautiful designs to be seen. Steve can
be reached through his website for consultation.
He used an unvitrified aggregate, kind of
like perlite, but not manufactured; perhaps
called tuff. It comes well graded, fine
to 1 1/2", with a few rocks which are
tossed out. He screens it a bit when doing
shells and adds the coarser stuff when doing
walls. Walls are mixed 8 espumilla/ one
cement / 1/2 lime. Structural roofs are
5/1/ 1/2 -- 2-3" of this, then 3"
or more of 8/1. Then 1/8" sand and
cement on top, scratched, the same day so
he can easily bond the next coat--polish
coat or add more lt. wt. roof fill between
vaults 10 / 1 / 1/2. Local blocks made out
of the stuff are 10/1 vibrated. A dry, fluffy
mix weighs about 75 pounds per cu. ft. He
figures that 4" = 2" styrofoam,
but he isn't sure.
From Wikipedia: Straw-bale construction
is a building method that uses bales of
straw (commonly wheat, rice, rye and oats
straw) as structural elements, building
insulation, or both. This construction method
is commonly used in natural building or
"green" construction projects.
Advantages of straw-bale construction over
conventional building systems include the
renewable nature of straw, cost, easy availability,
and high insulation value. Disadvantages
include susceptibility to rot and high space
requirements for the straw itself.
Straw bale building typically consists
of stacking rows of bales (often in running-bond)
on a raised footing or foundation, with
a moisture barrier or capillary break between
the bales and their supporting platform.
Bale walls can be tied together with pins
of bamboo, or wood (internal to the bales
or on their faces), or with surface wire
meshes, and then stuccoed or plastered,
either with a cement-based mix, lime-based
formulation, or earth/clay render. The bales
may actually provide the structural support
for the building ("load-bearing"
or "Nebraska-style" technique),
as was the case in the original examples
from the late 19th century.
Alternately, bale buildings can have a
structural frame of other materials, usually
lumber or timber-frame, with bales simply
serving as insulation and plaster substrate,
("infill" or "non-loadbearing"
technique), which is most often required
in northern regions and/or in wet climates.
In northern regions, the potential snow-loading
can exceed the strength of the bale walls.
In wet climates, the imperative for applying
a vapor-permeable finish precludes the use
of cement-based stucco commonly used on
load-bearing bale walls. Additionally, the
inclusion of a skeletal framework of wood
or metal allows the erection of a roof prior
to raising the bales, which can protect
the bale wall during construction, when
it is the most vulnerable to water damage
in all but the most dependably arid climates.
A combination of framing and load-bearing
techniques may also be employed, referred
to as "hybrid" straw bale construction.
Straw bales can also be used as part of
a Spar and Membrane Structure (SMS) wall
system in which lightly reinforced 2"
- 3" [5 cm - 8 cm] gunite
or shotcrete skins are interconnected with
extended "X" shaped light rebar
in the head joints of the bales. In this
wall system the concrete skins provide structure,
seismic reinforcing, and fireproofing, while
the bales are used as leave-in form work
and insulation.
Typically "field-bales", bales
created on farms with baling machines have
been used, but recently higher-density "precompressed"
bales (or "straw-blocks") are
increasing the loads that may be supported.
Field bales might support around 600 pounds
per linear foot of wall, but the high density
bales bear up to 4,000 lb./lin.ft.,
and more. The basic bale-building method
is now increasingly being extended to bound
modules of other oft-recycled materials,
including tire-bales, cardboard, paper,
plastic, and used carpeting. The technique
has also been extended to bags containing
"bales" of wood chips or rice
hulls. Straw bales have also been used in
very energy efficient high performance buildings
such as the S-House in Austria which meets
the Passivhaus energy standard.
In a sense, virtually all buildings are
hybrids of one sort or another. Most modern
buildings employ a wide range of materials,
some "natural" some not. A strawbale
house, for instance, is most likely a hybrid
of strawbales and conventional wood framing.
Unless the building is a dome or vault,
the roof is likely framed with wood or steel.
Our domed home is a hybrid of earthbag and
papercrete materials. I know of a fine circular
home that was minimally framed with 2X4
studs and then strawbales set on their ends
provided the insulation.
I am completely in favor of using hybrid
building concepts, because it frees the
mind to use whatever material or technique
is appropriate for any given application
or aesthetic. Cob is a wonderful material
for creating curved, sensuous forms; adobe
and rammed earth are great for thick, fairly
straight walls that serve as thermal mass;
earthbags can be used for either curved
or straight walls that can be either insulation
or thermal mass, depending on what they
are filled with; strawbales are best used
for straight, thick, insulating walls; cordwood
construction provides both thermal mass
and insulation, and is easiest when forming
straight walls; old tires make great retaining
walls, or even foundations for other materials;
aluminum cans can be mortared into walls
of any shape; papercrete is primarily an
insulating material that can be used as
a plaster, or a structural material and
is extremely malleable; rocks provide wonderful
thermal mass and can be stacked in a variety
of shapes.
I suggest that you take advantage of the
materials that can be found nearby that
do the job required and appeal to your fancy.
If it weren't for building codes, the only
rules for how you build would be the laws
of physics and mother nature. So, go for
it when you can!
Deck Homes
If you live in a place where the
weather is generally moderate to good,
such as the Sunbelt, you really need
more practical outdoor living areas
and minimum indoor. After all, southern
Arizona gets 300 plus days a year
of blue sky and daytime temperatures
between 60 and 95 degrees. For this
purpose, composite (recycled) decking
products like the Trex decking featured
here can be an ideal solution. The
900 square foot house is tucked between
two levels (in lower right) and has
an indoor/outdoor kitchen, bedroom,
bonus room (office or additional bedroom)
and a great room. It is all you really
need to enjoy the outdoors year round
and can be modified many ways depending
on site, needs, and budget.
From Wikipedia - Permaculture is an
approach to designing human settlements
and agricultural systems that are modeled
on the relationships found in natural ecologies.
Permaculture is sustainable land use design.
This is based on ecological and biological
principles, often using patterns that occur
in nature to maximise effect and minimise
work. Permaculture aims to create stable,
productive systems that provide for human
needs, harmoniously integrating the land
with its inhabitants. The ecological processes
of plants, animals, their nutrient cycles,
climatic factors and weather cycles are
all part of the picture. Inhabitants’ needs
are provided for using proven technologies
for food, energy, shelter and infrastructure.
Elements in a system are viewed in relationship
to other elements, where the outputs of
one element become the inputs of another.
Within a Permaculture system, work is minimised,
"wastes" become resources, productivity
and yields increase, and environments are
restored. Permaculture principles can be
applied to any environment, at any scale
from dense urban settlements to individual
homes, from farms to entire regions.
The first recorded modern practice of permaculture
as a systematic method was by Austrian farmer
Sepp Holzer in the 1960s, but the method
was scientifically developed by Australians
Bill Mollison and David Holmgren and their
associates during the 1970s in a series
of publications.
The word permaculture is described by Mollison
as a portmanteau of permanent agriculture,
and permanent culture.
The intent is that, by training individuals
in a core set of design principles, those
individuals can design their own environments
and build increasingly self-sufficient human
settlements — ones that reduce society's
reliance on industrial systems of production
and distribution that Mollison identified
as fundamentally and systematically destroying
Earth's ecosystems.
While originating as an agro-ecological
design theory, permaculture has developed
a large international following. This "permaculture
community" continues to expand on the
original ideas, integrating a range of ideas
of alternative culture, through a network
of publications, permaculture gardens, intentional
communities, training programs, and internet
forums. In this way, permaculture has become
a form of architecture of nature and ecology
as well as an informal institution of alternative
social ideals.
This is the concept we are working with
in designing the community. Obviously it
is simply a suggested blueprint concept
that we will have to adapt our goals and
practicalities to. Next are some types of
building techniques that can be adapted
to the overall concept of “Beyond Sustainable”
and” Permaculture.
Domes
Pacific Domes Intl. offers a variety of
sizes and a nearly unlimited number of configuration
options. In addition they have partnered
with other business and organizations to
provide turnkey applications to include
aquiculture, bio-energy and more.
Key features include ease of assembly,
protection of product or contents, can permit
sunlight for plant growth and retain an
atmosphere conducive to fast growth in agriculture.
See Pacific Domes for more information and
ideas.
Sand Bag / Flexible Forms
So what will eco-villages of the future look like?
Here is the collective vision of some dreamers as well
as some current projects to inspire and make you think.
All are possible, even if some are somewhat impractical
for various reasons at this current juncture in history.
But why not speculate and hope and be inspired.
“To build simple emergency and safe structures in our
backyards, to give us maximum safety with minimum environmental
impact, we must choose natural materials and, like nature
itself, build with minimum materials to create maximum
space, like a beehive or a sea shell,” says Nader Khalili
the redeveloper of “Super Adobe.” “And from this core
an entire village can be built cheaply, easily, and
then it can be expanded as needed.”
There are many, many uses and ways that local materials
can be used, used in a new way, or re-purposed as housing.
This particular technique will definitely be used at
“Eco Village #1” eco-village here in Tucson.
Another interesting possibility is the use of sprayed
concrete called a “monolithic pour.” There is a company
in Italy, Texas that has been making unique and innovative
designs for many years now. They range from the small
and relatively inexpensive to the much larger but prepared
against anything type. And they can work very well as
a ‘village concept” since in one form you can buy the
“airform” once and then make many different ones from
it, which adds greatly to the economy.
It is easy to see how someone could easily use this
technique to build and entire eco village that is safe
from just about every type of disaster from natural
to man made and this technology is available right now.
If smaller is better than these designs are way better.
Far from a shed-like tiny house, this imaginative home
that was designed to ‘act like a tree’ won the Solar
Decathlon Europe people’s choice award for both looks
and sustainability. Created by the Institute for Advanced
Architecture of Catalonia, the Lab House in Madrid has
a rounded shape and a roof covered in photovoltaic ‘leaves’
made from the world’s most flexible solar panels. The
energy captured by these ‘leaves’ runs down to the ‘roots’
of the house where it’s stored for later use. The surprisingly
roomy interior features a large open room that functions
as a living room, dining room and extra bedroom. Additional
sleeping space is located in a loft.
Some people can be a real square, but while
that is not my favorite shape, square can be good. Incredibly
simple and easy to build, the first prototype of the Cube
Project – known as QB1 – is three meters square, or about
97 square feet. Designed to generate more energy than
it uses over the course of a year thanks to a 1.48kW rooftop
solar system, QB1 houses a lounge, table, two chairs,
double bed, a full-sized shower, a kitchen, a washing
machine and a composting toilet. All it needs is grid
connection and cold water to operate.
This next design could technically be called
a tree house but it could also be in a cactus grove or
even in a flood plain with heavier duty anchors. Hovering
over a man-made pond, this incredible ‘treehouse’ on stilts
by Baumraum is definitely tiny – there’s barely more than
a bed inside, though the large porch does extend the living
space to a considerable degree, which would help in temperate
climates. But the Baumraum design makes for stunning and
unique guest quarters, and could possibly be enlarged
just slightly for year-round living.
Tiny house tree house
For those who want the future now here is
a prefab eco house that could just do it. This unusual-looking
three-story structure is a prefabricated modular house
by Broisson Architects of Mexico. Known as Shelter No.
2, the ‘pod’ has sleeping space for three people as well
as a kitchen, a reading and living area and a hydroponic
garden. The three levels are connected by a central spiral
staircase. It was made from 90% recycled materials.
For those near water there are many designs taking
that into account from Hurricane proof to riding in
the water so let’s take a look at some of them.
The Amphibious Container concept by Richard Moreta
is made with reused shipping crates and pallets, resting
on a foundation of truck inner tubes which serve as
a flotation device in the event of high waters. It can
handle a maximum water level of 7.5 feet. It is a good
option for costal cities and areas that occasionally
get way too much rain, but not a complete disaster.
Harvest City by E. Keven Schopfer is a complex
of floating modules measuring 2 miles in diameter, with
four zones connected by a linear system of canals. Cables
secure the whole complex, which includes a harbor ‘city
center’, to the sea bed. Again, this is an unproven but
we could do this right now if the will was there.
In another far out there but with technology
and know how here to do it this is a highly imaginative
design. Architect Vincent Callebaut has an idea: disaster-proof
floating housing inspired by coral reefs. The Coral Reef
Project consists of 1000 modular residences in dual wavy
stacks, supported on an artificial pier built on seismic
piles in the Caribbean. With energy harvested from the
waves, hydro-turbines and sea thermal energy conversion,
the structure improves the standard of living, providing
green terraces for each plug-in ‘pod’ and simplifying
delivery of supplies.
Floating city
And here is a way out there look at what
could be a possibility in the next century, assuming we
are relatively intact and survive what is going on now
that is. Floating mega-cities are Vincent Callebaut’s
specialty, and the Lilypad Floating Ecopolis is an especially
beautiful example of imagination run wild. The Lilypad
is an amphibious self-sufficient city able to accommodate
50,000 people along with enough plants and animals to
sustain them. The lower portion includes a submerged lagoon
which filters rainwater.
How about some under the water science mixed
with a little fantasy that isn’t as far out as one might
think. Right here in Tucson area we have Biosphere two
learning about this concept. It should come as no surprise
that others are looking toward the oceans which cover
70% of our planet. Imagine an entirely self-contained
city that could go practically anywhere as the need arose
– from floating on the surface of the ocean, to hidden
in the depths. Sub Biosphere 2 is a concept for a submerged
city featuring eight live/work/farm biomes surrounding
a large central biome containing all necessary equipment
to keep the city running. Theoretically, with enough notice
and supplies, Sub Biosphere 2 – which is also a seed bank
– could survive everything from a hurricane to a nuclear
war.
I personally always like it when we can
mimic Mother Nature and here is a design that does just
that. Some ocean cities aim not to look like a modern
metropolis that has simply been submerged, but like part
of the ecosystem of the sea. The beautiful ‘Syph’, a jellyfish-inspired
Ocean City concept for Australia, proposes not buildings
but ‘organisms’ that each have a specialized task like
producing food or housing residents. Designed by Arup
Biometrics for the ‘Now + When Australian Urbanism’ competition,
this concept has a flowing elegance that’s fitting for
its environment.
Here is still another breathtaking design
that could house an eco village or self sustaining group
of people. Like a combination of the Gyre and Australia’s
‘Syph’, the Water-Scraper is an inverted underwater skyscraper
but also employs some stunning biomimicry. Designer Sarly
Adre Bin Sarkum of Malaysia says “Its bioluminescent tentacles
provide sea fauna a place to live and congregate while
collecting energy through its kinetic movements.”
Getting back onto land here are some sustainable designs
that are intriguing. The first is from China by Saint
Val, an Architect. It is made of the quick growing bamboo
that while native to Asia, can easily be grown elsewhere.
His design is using bamboo poles and x-shaped metal
joints to form the ‘exoskeleton’ of each home. A circular
staircase wrapping around the central support beam brings
occupants to each successive floor, and canvas seals
the home from the elements.
Now here is a design suitable for an eco-village
in a more jungle type of environment. The curving organic
forms and natural materials of this structure by architect
Robert Harvey Oshatz seems as if it could have grown out
of the forest, calling to mind knots of wood and twisting
branches. The curves, in fact, are strategically placed
to take full advantage of the space in between the trees
that surround the building, giving it the feel of a huge
treehouse.
And speaking of tree homes here is an interesting
concept. Treehouses of all sorts are a natural in jungle
environments, and Finca Bellavista – an eco village in
Costa Rica – is a veritable display of the various styles
and designs that are possible, letting residents create
their own sustainable structures in the treetops. Described
as the world’s first planned, modern treehouse community,
Finca Bellavista features a large community complex with
a dining hall and an open-air lounge as well as a “Sky
Trail” transportation network of hanging boardwalks.
Still in the jungle but a little closer
to home is this unusually practical design. Open to the
warm winds of the Pacific Ocean, the prefabricated V-Houses
provide a rustic modern jungle retreat in Yelapa, Mexico,
outside of Puerto Vallarta. Three of the resort’s guest
houses stand out from the trees, made out of steel, plywood
and red corrugated iron roofs.
Jungle architecture "V" house
Another interesting but still futuristic
design comes under the heading of solar. Portable prefab
houses can definitely be well-designed and beautiful,
but the zeroHouse takes it up a notch with sustainable
features like a large solar panel array that also gathers
rainwater and provides shade. It may be super-compact,
but it packs a lot into that small footprint, including
a bedroom/bathroom module, second level deck, kitchen/living
module, an entry porch and storage space.
Here is a real home already built and in
the desert that could be relatively easy to adapt right
now. Living comfortably in a desert environment without
air conditioning may seem like an impossible dream, but
architect Lloyd Russell managed to create a structure
that is modern and eco-friendly with passive cooling thanks
to a rusted metal canopy that covers the home. This canopy
provides shade and air flow, and allows the home to blend
in well with historical industrial and farm buildings
in the area.
And how about taking an old sustainable
house type, the dome, and making it much more so. A rotating
dome home might sound like the hokey dream of a UFO enthusiast,
but spinning on a central axis actually serves an important
purpose. It allows this unusual home to adjust to balance
interior light and heat levels. Everything inside the
home is built around a central pivot point, and the home
spins silently using very little energy.
And finally for those of you that have everything
comes the ultimate eco green village home. Oh, part of
everything means a hundred million bucks to build this
super green house of the future. So with a price tag of
$100 million, this luxury green home needs to impress
with a long list of sustainable features and creature
comforts. When it comes to energy, at least, this pricey
home actually delivers, with renewable power production
strategies that allow the home to produce more energy
than it consumes. Where do I get mine?
So all in all we could be in for an amazing
ride into the future, so long as we have talented believers,
designers, architects, and social planners giving us their
visions. Hmmm, which one would you choose?