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By Kyle Holzhueter

Editors Note – This article is a feature length pictorial look at the various aspects of natural building in Korea.  The full-length article will be in the upcoming issue of The Last Straw and is available in its entirety right here on the website for subscribers.  Make sure you have a subscription soon so you won’t miss this stunning array of natural building techniques.

Traditional Korean Architecture

Traditional Building in Korea relied primarily on natural and local materials.  Buildings were traditionally designed according to the 間 (Korean: ka, Japanese: ken) module, a common measurement found in east Asia.

East Asian Modual

East Asian Module

Traditional Korean homes generally have a timber frame with adobe or wattle and daub infill, though regional variations are found throughout the country.

Traditional House

Traditional House

Regional Variation

Regional Variation

Especially on Jeju Island where volcanic rock and strong winds are abundant, homes traditionally consisted of a double wall system with an exterior wall of volcanic rock surrounding an interior wall, creating a protected corridor around the house.  This in turn, protected the interior walls from wind and rain and improved the thermal performance of the home.  Also because of the strong winds, thatched roofs were generally secured by a net of straw ropes.

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Home on Jeju Island

Home on Jeju Island

“Ondol” Korean Hypocaust System

Another characteristic of traditional Korean homes is the use of ondol, heated floors. The exhaust gases from wood fires travel under the living space, heating the floor above, and exit a chimney.

Ondul and Chimney

Ondul and Chimney

There are two types of ondol:

1. Ondol that use the firebox additionally for cooking.

Ondul also used for cooking

Ondul also used for cooking

2. Ondol whose firebox is used simply to heat the floor.

Exterior Fireboxes

Exterior Fireboxes

In both cases, the firebox can be found inside or outside of the building.

Ondol are also called Kudul, which literally means stone.  The name derives from the fact that large, flat stones are generally laid over passages beneath the floor through which the hot exhaust gases travel.  These hypocaust channels are organized in numerous ways.

Ondul brick and natural stone

Ondul brick and natural stone

Ondul ALC block and cut stone

Ondul ALC block and cut stone

Above these stones are layers of compacted earth and plastered earth.  The floors are ideally finished with hanji, Korean paper, and may be coated with additional oils and waxes.

Earthen floors and walls finished with paper

Earthen floors and walls finished with paper

Various materials are used to construct Ondol chimneys.  Traditionally, the simplest were constructed from wood.  The safer and more elaborate were constructed from stone, earth and/or tile.

Lumber Chimney

Lumber Chimney

Ceramic Chimney

Ceramic Chimney

Hollow Log (front) and Stone (back) Chimney

Hollow Log (front) and Stone (back) Chimney

Depending on the region, roofs were constructed using different materials.  Straw and thatch roofs appear to be the most common, but wood was preferred in some areas and tile roofs were common in cities.

Straw Thatch Roof

Straw Thatch Roof

Preparing roofing materials

Preparing roofing materials

Tile Roofs 

Tile Roofs

Earth and Tile

Earth and Tile

Earth as a Building Material

Walls were principally built with earth and finished in various ways.  As in many parts of the world, earth was a common building material and held a spiritual significance in Korea.  To Koreans, earth is the source of life.  Just as the seed grows from the soil, it was believed that life sprung from earth and returned to the earth.  Earth was not just a building material, but rather, earthen homes psychologically provide a safe abode, and for this reason, are still highly regarded in Korea.

Rammed Earth Ceremony

Rammed Earth Ceremony

Earthen architecture has a long history in Korea.  Suitable soils are abundant, locally available, and relatively easy to acquire.  However, the Korean War in the 1950’s and government housing policies in the 1970’s literally destroyed Korea’s earth building culture.

Modern Apartment Buildings

Modern Apartment Buildings

Despite a long history of natural building in Korea, concomitant with modern economic growth and infrastructure, the need for local and natural building materials has declined.  Fortunately, beginning in the 1980’s, interest in ecological architecture has led to a revival of Korea’s earth building culture and in recent years, interest in natural building is increasing.  Today, earth as a building material is held in high regard and popularly understood to be a healthy building material.

Modern Earth Building

Modern Earth Building

A number of organizations in Korea promote earth building.  Mokpo National University’s Earth Architecture Research Laboratory and the Korea Earth Architecture Institute, known as Terra Korea, conduct research on earth as a building material, structural tests on earth buildings, and develop new earth building methods.  For example, Mokpo National University has developed an earth building method using egg cartons as reinforcement, allowing construction to occur faster than traditional cob construction.  The egg cartons also provide stabilization and prevent cracking.

Earth Egg Pack Construction Sample

Earth Egg Pack Construction Sample

Earth Egg Pack Wall

Earth Egg Pack Wall

Claymax, INC., a comprehensive earthen building materials company, researches, develops, produces and sells commercial earthen building materials, such as earth blocks, earth pavement and earth plasters.

Claymax Compressed Earth Green Bricks School

Claymax Compressed Earth Green Bricks School

JaiSoon Ko’s Mud Ashram provides theoretical and practical courses in earth building for both professional and amateur builders.  JaiSoon Ko completed a PhD in philosophy at a German University and visited numerous ashrams in India, including Auroville, one of the world’s largest ecovillages.  There he encountered earthen architecture and since that time has built his own home and a complex of buildings at his DIY earth building school Mud Ashram.  Mud Ashram buildings feature adobe walls, earthen floors, and Ondol heating systems.

Mud Ashram, Dr. Ko

Mud Ashram, Dr. Ko

Straw Bale Building

Among popular natural building methods and materials, Korea is experiencing a boom in straw bale construction.  There are several reasons straw bale building is accelerating faster in Korea than Japan.  Korea has less precipitation than Japan, making it easier to build with earth plastered straw bale walls.  Also, there are fewer typhoons in autumn after the rice harvest, making it easier to field dry straw and produce straw bales.  Straw bales are produced by tractor driven balers.  There are a greater number of balers in Korea than Japan, and therefore bales are more commonly made and easier to acquire.  And lastly, Korea is less seismically active than Japan and the building codes require less diagonal bracing, making it easier to incorporate straw bales into a post and beam or 2×4 frame.

Straw Bale House

Straw Bale House

In Korea, there are many ways in which straw bales are utilized in building.  One popular method is to stack the bales between a double 2×4 frame.

Straw Bale House Double 2x4 frame

Straw Bale House Double 2×4 frame

Once the bales are stacked and secured, the wall is trimmed with a weed whacker.  This flattens the wall, making it easier to plaster, and produces an abundance of chopped straw.  The chopped straw is then mixed with plaster to prevent cracking.

Trimming Straw Bale Wall

Trimming Straw Bale Wall

Another reason straw bale building is experiencing such success in Korea is due to the work of Korea Straw Bale Institute and an excellent book published in Korean by the institute’s founder Soonchun Hong.  Soonchun Hong originally worked as an editor, but after discovering straw bale construction, he now works as an architect and builder concentrating solely on straw bale building.

Straw Bale Architect and Builder Mr. Soonchun Hong

Straw Bale Architect and Builder Mr. Soonchun Hong

There are various other organizations promoting natural building materials and methods ranging from intentional communities to small local groups.

Earth Bag Building

Another natural building technique gaining in popularity in South Korea is earth bag construction. Earth bag building involves stacking and tamping sandbags filled with earth in order to create bearing or infill walls, and is suitable for DIY construction.  For example, Ms. Hwasoon Lee, age 62, built her own earthbag house and is now building a home for her mother.

Earth Bag Home built by Ms. Lee

Earth Bag Home built by Ms. Lee

Ms. Lee

Ms. Lee

Seongwon Kim’s Earth Bag Building Association promotes earthbag construction, appropriate technology, and fuel efficient, hand-made wood burning stoves.  In Korea, Seongwon Kim is regarded as the godfather of DIY hand-made wood burning stoves. He’s published an excellent book in Korean describing the fundamentals of wood burning stoves and features practical models appropriate for owner-builders.

Seongwon Kim

Seongwon Kim

Understanding the connection between the built environment and personal health, SongWook Yang’s EcoHealing School teaches natural building and healing techniques.  For example, beginning in the spring of 2013, SongWook Yang will begin construction of a series of earth bag domes, which will provide housing and classroom space for a new school.

SongWook Yang’s EcoHealing School

SongWook Yang’s EcoHealing School

Ecovillages and Intentional Communiites

The Dandelion Community and School in Jinan County promote natural building materials and methods, such as rammed earth, straw bale and earthen plasters and provide training in renewable energy systems.  One of the founders, Dongkeun Lee, studied at the Centre for Alternative Technology in Wales and strives to create something similar at the Dandelion Community.

Straw Bale Building at the Dandelion Community

Straw Bale Building at the Dandelion Community

The Slow City Movement

Korea’s certified slow cities preserve traditional Korean culture including food and architecture.  The slow city movement originated in Greve, a small town in the Chianti region of Northern Italy, where it is known as Cittaslow.  A city needs to possess certain characteristics in order to be designated a Slow City. For example, Slow Cities should have no more than 50,000 residents, should have unique local cuisine made the old fashion way, without using machinery, and the city’s traditional heritage should be well-preserved. The town should have no fast food restaurants, large department stores or wholesale suppliers.  Eight places in Korea have been designated Slow Cities. These are Jeungdo district in the Sinan region, Cheongsando district in the Wando region, the Jangheung region of Jeollanam-do province, the Hadong region of Gyeongsangnam-do province, Changpyeong district in the Damyang region, Yesan region of Chuncheongnam-do province, Joan-myeon in Namyangju-si City, and Jeonju Hanok Village. For example, the Changpyeong district in the Damyang region not only preserves traditional architecture, but also builds new buildings using traditional natural building materials and methods.

Slow City

Slow City

Sanneoul Ecovillage incorporates natural building and renewable energy systems into a modern sustainable intentional community.  Sanneoul Ecovillage was designed by E-Jang, an environmental consulting firm founded by Gyeosoo Lim.  Sanneoul Ecovillage consists of 34 independent homes utilizing renewable energy and a community constructed wetland waste water treatment system.

Sanneoul Ecovillage

Sanneoul Ecovillage

Wanju County (Wanju-gun) is a county in North Jeolla Province and home to Gyeosoo Lim’s Community Business Center.  The community Business Center supports local businesses utilizing appropriate technology and environmental practices.  For example, the Community Business Center supports a community supported agricultural cooperative including over 200 farmers and 2000 consumers.  Wanju also hosts a number of environmental organizations.  For example, the Wanju Fire Club promotes the use of renewable energy sources for heating using DIY hand-made stoves.

Wanju Alternative Energy Association

Wanju Alternative Energy Association

Despite it’s relatively small size, South Korea hosts an active natural building movement incorporating various natural building materials, methods and systems.  There is much we can learn from South Korea in the field of sustainability.

Kyle works as a builder, consultant, researcher and educator specializing in natural building materials such as straw bale, light straw clay and natural  plasters. He has a PhD in Bioresource Sciences from Nihon University where he researched the hygrothermal environment of straw bale walls in Japan and building practices to control moisture. Apart from academia, Kyle has studied natural farming in Japan, permaculture in Australia, and organic and biodynamic farming in the US.  Further details can be found at the following links:
http://holzhueter.blogspot.com
http://japaneseplastering.blogspot.com

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