How to Build a Yurt.
Yurts are
simple and quick to build compared to other alternative homes. The traditional
Mongolian yurt is brilliant in its simplicity. Physics rather than brawn
provide structural strength. The lattice wall leans slightly out, a steel cable
holds it in place enabling the wall to support the roof. The drawbacks are:
poor ventilation, no windows and perhaps having to cuddle up to sheep for
supplemental heat. These can be easily rectified by framing in windows,
installing an airtight woodstove and fitting fiberglass insulation into the
earth plaster covering the wall frame. A two-foot roof overhang, along with a
coat of lime wash protects the wall from rain.
A cedar log in the center supports the roof. The bones of the building
are Mongolian, the skin is Iron Age Celtic. The timeless challenge is to turn
the dream into reality when you’re clinging to the margins of society. There is
also the spectre of building permits and bye-law regulations. These are there
to protect us from our own and our neighbour’s follies and misfortunes.
Building codes are based upon what has pasted the test of time. Imagine Monty
Python as a Roman building inspector facing down the Mongol horde of Genghis
Khan… “Yurts?!!!... Nooooooo… you must have
proper buildings.” Building an alternative home is a Homeric journey – you can
make it to the distant shore with sweat, research and a smidgeon of luck.
Kindness,
helpfulness and sociability are all marketable skills. Baby boomers are now in
their dotage and many elderly people are living alone on beautiful rural
properties. Some of them would welcome the comfort and security of having a
supportive couple living close by. Local government is edging in this
direction. To help this trend we need to build things right.
There is a
long list of parameters to consider when choosing a site. Southern exposure,
protection from prevailing wind, avoiding low ground, water management and
vehicular access to name a few. This is going to be your home, make it so
magical that you never want to leave. Luckily, creativeness and frugality go
hand in hand. There is a bibliography at the end of these notes, these books
will give you the knowledge and confidence you need. Take comfort with the
thought that these building techniques and materials have proven successful for
thousands of years, unlike the modern suburban home which is experimental and
decidedly dodgy to live in with off-gassing, flammable materials and stale air.
Before going into the details of construction it helps to have an overview so
that you can have a picture in your mind’s eye.
The yurt is
built on a two-foot high platform of packed sub-soil with a top-dressing of
limestone screenings. In my experience, a twenty-foot diameter starter home
with a 315 sq. ft. floor is the right balance between economy, structural
strength and liveability. The rounded
door is framed by fitting two curved logs together, the window frames are
attached to posts dug into the ground. The lattice wall is covered on the
inside and outside with an earth plaster, fiberglass insulation is sandwiched
between the plaster. The chimney for the woodstove passes through the wall.
Three of the five window open and this ensures good cross-ventilation. The
cedar poles for the lattice wall are seven long and five inches in diameter.
The poles for the roof are twelve long and six inches diameter at the top. The
roof poles are two feet apart at the wall. Roof strapping is done with salvaged
1” by 6” planks. Three layers of tarps cover the roof, the middle one is 100%
waterproof, the other two protect it from the rough edges of the planks and
from UV radiation. The roof is covered with a thin layer of compost; this holds
down the tarps, helps to insulate and looks natural.
All houses
need to be higher than the surrounding land to protect them from surface
run-off. Building on packed sub-soil
rather than on a timber frame prevents having cold air and critters under the
floor. The platform needs to be at least six feet wider than the yurt. Driving
over the dirt with a front-end loader tractor as it is being built will pack it
hard. Then, add a top dressing of six inches or more of limestone screenings.
Wet screenings packs hard.
Before building the wall, the center post needs to be set in
position along with posts for the door frame and the main south-facing window.
The posts for the other windows are smaller and they are fitted after the wall
is up. The trick to digging holes by hand in hard ground is to use water. Dig
as deep as you can be using a digging bar, spade and digging clams. When you
hit impossibly hard ground pour six inches of water in the hole, twenty minutes
later the ground will be soft enough to get down another few inches, repeat
this until you reach a depth of at least 2’9”, preferably 3’6”. I’m fortunate to
have cedar logs available which are resistant to rot. An alternative method is
to place the post in a plastic bin to protect the wood from moisture.
Curved and irregular shaped doors and windows have charm and
character. Hanging the door and fitting the two curved door posts takes
ingenuity and chainsaw skills. I scout my woodlot for a pair of curved logs at
least eight feet long and no less than eight inches in diameter. These are dug
into the ground on the east side to form an arch. The door is roughly four feet
wide and five feet high, big enough for furniture and a full-size mattress to
fit through. The trick is to have enough of one door post plumb so that the
door doesn’t open like a gull’s wing. The door opens outward so that bears at
least knock before entering. Next, set a pair of 8” posts on the south side to
frame the window, measure the width of the window and allow for the 2” by 6”
planks that will frame it. It is easier to frame the window if the posts are
half-rounds.
A 20’diamerter circle has a circumference of just over 62ft.
My yurt has 32 roof poles, each one is supported at the wall by the crossed
wall poles. The first step is to make about thirty pairs of crossed poles. The
dimensions are: 7’ poles that are five to six inches in diameter, crossed 9”
from the top with the base 52” apart. Fasten them together with 6” or 8” nails.
Mark the position of the wall by laying a rope on the ground. Place the first
pair of crossed poles in position on the line of the wall and support them
temporally with a 12’ roof beam. Add the next pair of crossed poles so that the
tops are two feet apart. Follow the same pattern with the remainder of the wall
poles, for example, the right leg of one pair cross over and in front of the
left leg of the next pair. This maintains the curvature of the circle. After a
few pairs are in place, only every third or forth with need to be supported.
Lean the wall poles out approximately five degrees. Thread 3/8” steel cable
through the joins of the poles and attach the ends with a turnbuckle. Adjust
the poles so that you now have a uniform lattice wall that leans slightly out.
Tighten the turnbuckle. Wire the legs of the poles tightly together wherever
they cross. The roof poles can now be placed in position to form the roof frame.
The thin end of the poles rest on the wall. The roof overhang above the south
window may need to be adjusted to maximize the heat, winter sunshine and
sprouting salad greens.
Iron Age round houses had a roof angle of 14 degrees. Steep
enough so that rain flows off, but not so steep that it becomes a torrent
eroding the platform or the living roof. The inside height is eight feet in the
center and six feet at the wall. The center post supports over thirty poles
with seven-inch tops. Ideally, find a tree trunk that has a fork or large limb
that can be used to support some of the poles. Alternatively, fit four poles on
the trunk and lay the others on top of these. Anchor the poles with eight-inch
nails. The roof is then covered with 1” by 6” planks, preferably hardwood. Fit
the planks close together, otherwise the tarp can bulge through the gap.
Dumpster cowboys are center stage during roofing when scrap timber and trashed
tarps are golden. There are many options for the waterproof layer. A heavy-duty
agricultural tarp costs about $400 and polythene vapor barrier $40. Then there
are all the hi-tech liners used for tailing ponds. My choice was polythene
vapor barrier sandwiched between old worn tarps and this works fine. The vapor
barrier comes in eight-foot widths and is taped in position. Fasten the edge of
the tarps to the underside of the roof overhang. A wood frame of light poles
holds the tarps and the ‘black gold’ compost in place. Take a pair of
seven-foot poles (left over from the wall), attached the ends together six feet
apart with wire, place this over the peak of the roof, do the same with another
pair of poles in the opposite direction. The peak should now be ringed by four
poles approximately three feet from the top of the roof. Attach more poles onto
these until there is a spider’s web of poles covering the roof. This ‘deadman’
style of construction enables a fabric to be anchored to a roof without
punching nail holes in it. Next, shovel a three-inch layer of compost onto the
roof.
Windows provide ventilation, heat in winter and year-long
daylight. It is easiest to fit standard recycled windows. If you have the time
and ingenuity, rounded plate glass table tops, car windshields or even a car
door can be fitted into the wall. I drive pick-up trucks until they drop, the
doors are reincarnated into hobbit homes. There is something about winding down
the window, feeling the fresh summer breeze, tunes taking you down memory lane
and you’re still on the couch. The main south-facing window is a full-size
glass patio door set sideways. Three other windows are timber-framed and have
hinges on the upper side, so they swing open from the top. They are framed into
posts dug into the ground, the frame must be sturdy enough to support a section
of the roof because one pair of wall poles is removed to fit the window. A smaller window on the west side allows the
late afternoon sun to stream in. Quality of life inside the yurt is dependant
upon good ventilation, plenty of daylight and scenic views.
The lattice wall is covered with fabric and chicken wire,
this will later be covered with earth plaster. An alternative is to weave
branches or lathes between the poles to hold the plaster. Landscape fabric
provides a cheap breathable barrier, house wrap is a more expensive option. The
fabric provides a layer between the plaster and the fiberglass insulation. The wall has five layers: a lime white wash,
earth plaster, chicken wire, fabric, fiberglass insulation, fabric, chicken wire
and earth plaster. The fabric and chicken wire are nailed to the lattice wall.
Thread 12-gauge wire through the chicken wire to give it extra support. The
fiberglass insulation is fitted into the lattice wall. The result is a weather
proof breathable wall at minimal cost. Planet loyalty, aesthetics and
breathability is why you should use earth plaster and not cement stucco.
The floor is paving stone or interlocking brick. These are
easy to embed into the limestone screenings. Master scavengers can source these
from the detritus of construction projects. The stone floor is a heat sink for
sunshine and the woodstove. A wood floor and area carpets can be added later. A
small airtight wood stove provides heat and is used for cooking. The chimney
passes through the wall where it is protected from the weather by the roof
overhang. Anchor the chimney to the roof for support. Read the building code before
installing the stove.
A 40-watt solar panel with a charge controller and a 12- volt
battery will power LED lights and charge a smart phone or tablet. Ideally, have
two batteries so that there is backup for overcast winter days. The cost jumps
substantially if you add more panels and an inverter for AC current. In
practice, it’s cheaper to have a top- quality generator for when you need more
power, such as, running a vacuum cleaner or a vehicle block heater. Generators
must be run regularly to remain reliable.
Earth plastering is where you really connect with the planet
- mixing sand, clay and water together, squishing straw into it and then
massaging gobs of it into the wall. It takes time, ingredients can be varied,
mistakes can be rectified, and the results are deeply satisfying. It’s more
important to grasp the principles and variables than rigidly follow a recipe or
technique. First, do a simple test to learn the percentage of the ingredients
in the proposed earth you plan to make the plaster out of. Half fill a jam jar
with dirt, fill it water add a spoonful of salt and shake. Sand, silt and clay
will separate out enabling you modify the mix so that you have roughly a 50-70%
sand to clay mix. Earth plaster is clay, sand, fiber and water mixed so that
it’s soft and sticky. Adapt what you’ve got to what you need. Here is an
overview; clay is the glue, sand gives strength and reduces shrinkage and straw
reinforces. It’s best to have three layers, the first gives a rough layer that
is pushed into the wire mesh to form a strong base. The second layer smooths
out the unevenness and the final layer is finer, thinner and less likely to
crack. It can take a week or more for each layer to dry. To help the second and
third layers stick, wet the plaster with a lime wash. Longer straw is stronger
than short. Plastering is unleashing your creative genius; it takes you off on
wild riffs improvising with shredded paper, animal manure, hair, sawdust – the
list is endless. Mastery comes practice or to borrow a line from Van Morrison -
‘you have to do it for real, anytime, anywhere’.
Barefoot Architect by Johan Lengen Copyright 2018, Hugh Morshead
Earthbag Building by Kaki Hunter and Donald Kiffmeyer
Building Green by Clarke Snell
and Tim Callahan
How to Build a Yurt.
Yurts are
simple and quick to build compared to other alternative homes. The traditional
Mongolian yurt is brilliant in its simplicity. Physics rather than brawn
provide structural strength. The lattice wall leans slightly out, a steel cable
holds it in place enabling the wall to support the roof. The drawbacks are:
poor ventilation, no windows and perhaps having to cuddle up to sheep for
supplemental heat. These can be easily rectified by framing in windows,
installing an airtight woodstove and fitting fiberglass insulation into the
earth plaster covering the wall frame. A two-foot roof overhang, along with a
coat of lime wash protects the wall from rain.
A cedar log in the center supports the roof. The bones of the building
are Mongolian, the skin is Iron Age Celtic. The timeless challenge is to turn
the dream into reality when you’re clinging to the margins of society. There is
also the spectre of building permits and bye-law regulations. These are there
to protect us from our own and our neighbour’s follies and misfortunes.
Building codes are based upon what has pasted the test of time. Imagine Monty
Python as a Roman building inspector facing down the Mongol horde of Genghis
Khan… “Yurts?!!!... Nooooooo… you must have
proper buildings.” Building an alternative home is a Homeric journey – you can
make it to the distant shore with sweat, research and a smidgeon of luck.
Kindness,
helpfulness and sociability are all marketable skills. Baby boomers are now in
their dotage and many elderly people are living alone on beautiful rural
properties. Some of them would welcome the comfort and security of having a
supportive couple living close by. Local government is edging in this
direction. To help this trend we need to build things right.
There is a
long list of parameters to consider when choosing a site. Southern exposure,
protection from prevailing wind, avoiding low ground, water management and
vehicular access to name a few. This is going to be your home, make it so
magical that you never want to leave. Luckily, creativeness and frugality go
hand in hand. There is a bibliography at the end of these notes, these books
will give you the knowledge and confidence you need. Take comfort with the
thought that these building techniques and materials have proven successful for
thousands of years, unlike the modern suburban home which is experimental and
decidedly dodgy to live in with off-gassing, flammable materials and stale air.
Before going into the details of construction it helps to have an overview so
that you can have a picture in your mind’s eye.
The yurt is
built on a two-foot high platform of packed sub-soil with a top-dressing of
limestone screenings. In my experience, a twenty-foot diameter starter home
with a 315 sq. ft. floor is the right balance between economy, structural
strength and liveability. The rounded
door is framed by fitting two curved logs together, the window frames are
attached to posts dug into the ground. The lattice wall is covered on the
inside and outside with an earth plaster, fiberglass insulation is sandwiched
between the plaster. The chimney for the woodstove passes through the wall.
Three of the five window open and this ensures good cross-ventilation. The
cedar poles for the lattice wall are seven long and five inches in diameter.
The poles for the roof are twelve long and six inches diameter at the top. The
roof poles are two feet apart at the wall. Roof strapping is done with salvaged
1” by 6” planks. Three layers of tarps cover the roof, the middle one is 100%
waterproof, the other two protect it from the rough edges of the planks and
from UV radiation. The roof is covered with a thin layer of compost; this holds
down the tarps, helps to insulate and looks natural.
All houses
need to be higher than the surrounding land to protect them from surface
run-off. Building on packed sub-soil
rather than on a timber frame prevents having cold air and critters under the
floor. The platform needs to be at least six feet wider than the yurt. Driving
over the dirt with a front-end loader tractor as it is being built will pack it
hard. Then, add a top dressing of six inches or more of limestone screenings.
Wet screenings packs hard.
Before building the wall, the center post needs to be set in
position along with posts for the door frame and the main south-facing window.
The posts for the other windows are smaller and they are fitted after the wall
is up. The trick to digging holes by hand in hard ground is to use water. Dig
as deep as you can be using a digging bar, spade and digging clams. When you
hit impossibly hard ground pour six inches of water in the hole, twenty minutes
later the ground will be soft enough to get down another few inches, repeat
this until you reach a depth of at least 2’9”, preferably 3’6”. I’m fortunate to
have cedar logs available which are resistant to rot. An alternative method is
to place the post in a plastic bin to protect the wood from moisture.
Curved and irregular shaped doors and windows have charm and
character. Hanging the door and fitting the two curved door posts takes
ingenuity and chainsaw skills. I scout my woodlot for a pair of curved logs at
least eight feet long and no less than eight inches in diameter. These are dug
into the ground on the east side to form an arch. The door is roughly four feet
wide and five feet high, big enough for furniture and a full-size mattress to
fit through. The trick is to have enough of one door post plumb so that the
door doesn’t open like a gull’s wing. The door opens outward so that bears at
least knock before entering. Next, set a pair of 8” posts on the south side to
frame the window, measure the width of the window and allow for the 2” by 6”
planks that will frame it. It is easier to frame the window if the posts are
half-rounds.
A 20’diamerter circle has a circumference of just over 62ft.
My yurt has 32 roof poles, each one is supported at the wall by the crossed
wall poles. The first step is to make about thirty pairs of crossed poles. The
dimensions are: 7’ poles that are five to six inches in diameter, crossed 9”
from the top with the base 52” apart. Fasten them together with 6” or 8” nails.
Mark the position of the wall by laying a rope on the ground. Place the first
pair of crossed poles in position on the line of the wall and support them
temporally with a 12’ roof beam. Add the next pair of crossed poles so that the
tops are two feet apart. Follow the same pattern with the remainder of the wall
poles, for example, the right leg of one pair cross over and in front of the
left leg of the next pair. This maintains the curvature of the circle. After a
few pairs are in place, only every third or forth with need to be supported.
Lean the wall poles out approximately five degrees. Thread 3/8” steel cable
through the joins of the poles and attach the ends with a turnbuckle. Adjust
the poles so that you now have a uniform lattice wall that leans slightly out.
Tighten the turnbuckle. Wire the legs of the poles tightly together wherever
they cross. The roof poles can now be placed in position to form the roof frame.
The thin end of the poles rest on the wall. The roof overhang above the south
window may need to be adjusted to maximize the heat, winter sunshine and
sprouting salad greens.
Iron Age round houses had a roof angle of 14 degrees. Steep
enough so that rain flows off, but not so steep that it becomes a torrent
eroding the platform or the living roof. The inside height is eight feet in the
center and six feet at the wall. The center post supports over thirty poles
with seven-inch tops. Ideally, find a tree trunk that has a fork or large limb
that can be used to support some of the poles. Alternatively, fit four poles on
the trunk and lay the others on top of these. Anchor the poles with eight-inch
nails. The roof is then covered with 1” by 6” planks, preferably hardwood. Fit
the planks close together, otherwise the tarp can bulge through the gap.
Dumpster cowboys are center stage during roofing when scrap timber and trashed
tarps are golden. There are many options for the waterproof layer. A heavy-duty
agricultural tarp costs about $400 and polythene vapor barrier $40. Then there
are all the hi-tech liners used for tailing ponds. My choice was polythene
vapor barrier sandwiched between old worn tarps and this works fine. The vapor
barrier comes in eight-foot widths and is taped in position. Fasten the edge of
the tarps to the underside of the roof overhang. A wood frame of light poles
holds the tarps and the ‘black gold’ compost in place. Take a pair of
seven-foot poles (left over from the wall), attached the ends together six feet
apart with wire, place this over the peak of the roof, do the same with another
pair of poles in the opposite direction. The peak should now be ringed by four
poles approximately three feet from the top of the roof. Attach more poles onto
these until there is a spider’s web of poles covering the roof. This ‘deadman’
style of construction enables a fabric to be anchored to a roof without
punching nail holes in it. Next, shovel a three-inch layer of compost onto the
roof.
Windows provide ventilation, heat in winter and year-long
daylight. It is easiest to fit standard recycled windows. If you have the time
and ingenuity, rounded plate glass table tops, car windshields or even a car
door can be fitted into the wall. I drive pick-up trucks until they drop, the
doors are reincarnated into hobbit homes. There is something about winding down
the window, feeling the fresh summer breeze, tunes taking you down memory lane
and you’re still on the couch. The main south-facing window is a full-size
glass patio door set sideways. Three other windows are timber-framed and have
hinges on the upper side, so they swing open from the top. They are framed into
posts dug into the ground, the frame must be sturdy enough to support a section
of the roof because one pair of wall poles is removed to fit the window. A smaller window on the west side allows the
late afternoon sun to stream in. Quality of life inside the yurt is dependant
upon good ventilation, plenty of daylight and scenic views.
The lattice wall is covered with fabric and chicken wire,
this will later be covered with earth plaster. An alternative is to weave
branches or lathes between the poles to hold the plaster. Landscape fabric
provides a cheap breathable barrier, house wrap is a more expensive option. The
fabric provides a layer between the plaster and the fiberglass insulation. The wall has five layers: a lime white wash,
earth plaster, chicken wire, fabric, fiberglass insulation, fabric, chicken wire
and earth plaster. The fabric and chicken wire are nailed to the lattice wall.
Thread 12-gauge wire through the chicken wire to give it extra support. The
fiberglass insulation is fitted into the lattice wall. The result is a weather
proof breathable wall at minimal cost. Planet loyalty, aesthetics and
breathability is why you should use earth plaster and not cement stucco.
The floor is paving stone or interlocking brick. These are
easy to embed into the limestone screenings. Master scavengers can source these
from the detritus of construction projects. The stone floor is a heat sink for
sunshine and the woodstove. A wood floor and area carpets can be added later. A
small airtight wood stove provides heat and is used for cooking. The chimney
passes through the wall where it is protected from the weather by the roof
overhang. Anchor the chimney to the roof for support. Read the building code before
installing the stove.
A 40-watt solar panel with a charge controller and a 12- volt
battery will power LED lights and charge a smart phone or tablet. Ideally, have
two batteries so that there is backup for overcast winter days. The cost jumps
substantially if you add more panels and an inverter for AC current. In
practice, it’s cheaper to have a top- quality generator for when you need more
power, such as, running a vacuum cleaner or a vehicle block heater. Generators
must be run regularly to remain reliable.
Earth plastering is where you really connect with the planet
- mixing sand, clay and water together, squishing straw into it and then
massaging gobs of it into the wall. It takes time, ingredients can be varied,
mistakes can be rectified, and the results are deeply satisfying. It’s more
important to grasp the principles and variables than rigidly follow a recipe or
technique. First, do a simple test to learn the percentage of the ingredients
in the proposed earth you plan to make the plaster out of. Half fill a jam jar
with dirt, fill it water add a spoonful of salt and shake. Sand, silt and clay
will separate out enabling you modify the mix so that you have roughly a 50-70%
sand to clay mix. Earth plaster is clay, sand, fiber and water mixed so that
it’s soft and sticky. Adapt what you’ve got to what you need. Here is an
overview; clay is the glue, sand gives strength and reduces shrinkage and straw
reinforces. It’s best to have three layers, the first gives a rough layer that
is pushed into the wire mesh to form a strong base. The second layer smooths
out the unevenness and the final layer is finer, thinner and less likely to
crack. It can take a week or more for each layer to dry. To help the second and
third layers stick, wet the plaster with a lime wash. Longer straw is stronger
than short. Plastering is unleashing your creative genius; it takes you off on
wild riffs improvising with shredded paper, animal manure, hair, sawdust – the
list is endless. Mastery comes practice or to borrow a line from Van Morrison -
‘you have to do it for real, anytime, anywhere’.
Barefoot Architect by Johan Lengen Copyright 2018, Hugh Morshead
Earthbag Building by Kaki Hunter and Donald Kiffmeyer
Building Green by Clarke Snell
and Tim Callahan