Alternative natural materials

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Alternative natural materials are natural materials like rock or adobe that are not as commonly used as materials such as wood or iron. Alternative natural materials have many practical uses in areas such as sustainable architecture and engineering. The main purpose of using such materials is to minimize the negative effects that built environments can have on the planet, while increasing the efficiency and adaptability of the structures.

Contents

History

Alternative natural materials have existed for quite some time but often in very basic forms, or only as ingredients to a particular material. For example, earth used as a building material for walls of houses has existed for thousands of years. Much more recently, in the 1920s, the United States government promoted rammed earth as a fireproof construction method for building farmhouses. [1] Another more common example is adobe. Adobe homes are prominent in the southwestern U.S. and several Spanish-speaking countries. [2]

Straw bale construction is a more modern concept, but there exists evidence that straw was used to make homes in African prairies as far back as the Paleolithic times. [2] Alternative natural materials, specifically their applications, have only recently made their way into more common use. The modern problems of global warming and climate change shifted more of a focus onto the materials and methods used to build our cityscape and homes. As environmentally conscious decisions became commonplace, the use of alternative natural materials instead of typical natural materials or man-made materials that rely heavily on natural resources became prominent.[ citation needed ]

Structural materials

Rock

Rocks have two characteristics: good thermal mass and thermal insulation. The temperature in a house built from rock stays relatively constant, thus requiring less air conditioning and other cooling systems. Types of rocks that can be employed are reject stone (pieces of stone that are not able to be used for another task), limestone, and flagstone.[ citation needed ]

This picture depicts a cyclone- and earthquake-resistant home made completely of bamboo. Construction maison bambou.jpg
This picture depicts a cyclone- and earthquake-resistant home made completely of bamboo.

Bamboo

In Asian countries, bamboo is used for structures like bridges and homes. Bamboo is surprisingly strong and flexible and grows incredibly fast, making it an abundant material. Although it can be difficult to join corners together, bamboo's material strength makes up for the hardships that can be encountered while building with it.[ citation needed ]

Rammed earth

Rammed earth is a very abundant material that can be used in place of concrete and brick. Soil is packed tightly into wall molds where it is rammed together and hardened to form a durable wall packing made of nothing more than dirt, stones, and sticks. [3] Rammed earth also provides thermal mass, resulting in energy savings. In addition, it is very weatherproof and durable enough that it was used in the Great Wall of China.[ citation needed ]

Earth-sheltered

Earth sheltering is a unique building technique in which buildings are completely constructed by some form of earth on at least one side, whether it be a grass roof, clay walls, or both. This unique system usually includes plenty of windows because of the difficulty involved with using too much electricity in such a house.[ citation needed ] This adds to the energy efficiency of the house by reducing lighting costs.

Insulation materials

This article shows a straw bale wall under construction. Sb-wall-tight-curve.jpg
This article shows a straw bale wall under construction.

Straw

Straw bales can be used as a basis for walls instead of drywall. Straw provides excellent insulation and fire resistance in a traditional post-and-beam structure, where a wood frame supports the house. [3] These straw walls are about 75% more energy efficient than standard drywall and because no oxygen can get through the walls, fire cannot spread and there is no chance of combustion.[ citation needed ]

Cordwood

Cordwood is a combination of small remnants of firewood and other lumber that would otherwise go to waste. These small blocks of wood can be put together easily to make a structure that, like stone, has insulation as well as thermal mass. Cordwood provides the rustic look of log cabins without the use of tons of lumber. An entire building can be constructed with just cordwood, or stones can be used to fill in the walls.[ citation needed ]

Cork

Cork is suitable as thermal insulation, as it is characterized by lightness, elasticity, impermeability, and fire resistance. In construction, cork can be applied in various construction elements like floors, walls, roofs, and lofts to reduce the need for heating or cooling and to enhance energy efficiency.

Adobe

Adobe is an age-old technique that is cheap, easy to obtain, and ideal for hot environments. A mixture of sand, clay, and water is poured into a mold and left in the sun to dry. When dried, it is exceptionally strong and heat-resistant. Adobe does not let much heat through to the inside of the structure, thus providing excellent insulation during the summer to reduce energy costs. Although this clay mixture provides excellent insulation from heat, it is not very waterproof and can be dangerous in earthquake prone areas due to its tendency to crack easily.[ citation needed ]

Sawdust

Sawdust can be combined with clay or cement mixtures and used for walls. Such walls are very sturdy and the method effectively recycles any trees needing excavation from the building area. Depending what type of sawdust is used (hardwood is best) the wood chips in the walls absorb moisture and help prevent cracking during freeze and thaw cycles. [1] Sawdust may be combined with water and frozen to produce a material commonly known as pykrete, which is strong, and less prone to melting than regular ice.

Papercrete

Papercrete is a new material that serves as a good substitute for concrete. Papercrete is shredded paper, sand, and cement mixed together to form a very durable brick-like material. Buildings utilizing papercrete are well-insulated and resistant to termites and fire. Papercrete is very cheap as it usually only costs about $0.35 per square foot.[ citation needed ]

Hempcrete

Construction block made from hempcrete Bloc de chanvre ep 15cm.gif
Construction block made from hempcrete

Hempcrete, also known as hemplime, is a sustainable biocomposite composed of hemp hurds mixed with lime, sand, or pozzolans material used in construction and insulation. The material offers advantages such as ease of use, insulation, and moisture regulation without the brittleness of traditional concrete. However, it exhibits low mechanical performance and is not suitable for load-bearing structures. It has good thermal and acoustic insulation properties, making it suitable for (non-load bearing) walls, finishing plaster, and insulation. It also acts as a carbon sink.[ citation needed ]

Hempcrete gained popularity in France since the 1990s, and is used in Canada for various construction purposes, such as indoor temperature control, prefabricated panels, and diverse insulation needs with different density mixtures.[ citation needed ]

Examples

Although alternative building materials are a newer concept, some buildings have already employed these materials, as well as other tactics, in pursuit of greater sustainability.

See also

Related Research Articles

<span class="mw-page-title-main">Adobe</span> Building material of earth and organic materials

Adobe is a building material made from earth and organic materials. Adobe is Spanish for mudbrick. In some English-speaking regions of Spanish heritage, such as the Southwestern United States, the term is used to refer to any kind of earthen construction, or various architectural styles like Pueblo Revival or Territorial Revival. Most adobe buildings are similar in appearance to cob and rammed earth buildings. Adobe is among the earliest building materials, and is used throughout the world.

<span class="mw-page-title-main">Thermal mass</span> Use of thermal energy storage in building design

In building design, thermal mass is a property of the mass of a building that enables it to store heat and provide inertia against temperature fluctuations. It is sometimes known as the thermal flywheel effect. The thermal mass of heavy structural elements can be designed to work alongside a construction's lighter thermal resistance components to create energy efficient buildings.

<span class="mw-page-title-main">Earth shelter</span> House partially or entirely surrounded by earth

An earth shelter, also called an earth house, earth bermed house, or underground house, is a structure with earth (soil) against the walls, on the roof, or that is entirely buried underground.

<span class="mw-page-title-main">Earth materials</span>

Earth materials include minerals, rocks, soil and water. These are the naturally occurring materials found on Earth that constitute the raw materials upon which our global society exists. Earth materials are vital resources that provide the basic components for life, agriculture and industry.

<span class="mw-page-title-main">Straw-bale construction</span> Building method that uses bales of straw

Straw-bale construction is a building method that uses bales of straw as structural elements, building insulation, or both. This construction method is commonly used in natural building or "brown" construction projects. Research has shown that straw-bale construction is a sustainable method for building, from the standpoint of both materials and energy needed for heating and cooling.

<span class="mw-page-title-main">Cob (material)</span> Building material made of soil and fiber

Cob, cobb, or clom is a natural building material made from subsoil, water, fibrous organic material, and sometimes lime. The contents of subsoil vary, and if it does not contain the right mixture, it can be modified with sand or clay. Cob is fireproof, termite proof, resistant to seismic activity, and uses low-cost materials, although it is very labour intensive. It can be used to create artistic and sculptural forms, and its use has been revived in recent years by the natural building and sustainability movements.

<span class="mw-page-title-main">Building material</span> Material which is used for construction purposes

Building material is material used for construction. Many naturally occurring substances, such as clay, rocks, sand, wood, and even twigs and leaves, have been used to construct buildings. Apart from naturally occurring materials, many man-made products are in use, some more and some less synthetic. The manufacturing of building materials is an established industry in many countries and the use of these materials is typically segmented into specific specialty trades, such as carpentry, insulation, plumbing, and roofing work. They provide the make-up of habitats and structures including homes.

<span class="mw-page-title-main">Rammed earth</span> Construction material of damp subsoil

Rammed earth is a technique for constructing foundations, floors, and walls using compacted natural raw materials such as earth, chalk, lime, or gravel. It is an ancient method that has been revived recently as a sustainable building method.

<span class="mw-page-title-main">Cordwood construction</span>

Cordwood construction is a term used for a natural building method in which short logs are piled crosswise to build a wall, using mortar or cob to permanently secure them. This technique can use local materials at minimal cost.

<span class="mw-page-title-main">Earthship</span> Style of architecture that uses native materials and upcycled materials to build homes.

An Earthship is a style of architecture developed in the late 20th century to early 21st century by architect Michael Reynolds. Earthships are designed to behave as passive solar earth shelters made of both natural and upcycled materials such as earth-packed tires. Earthships may feature a variety of amenities and aesthetics, and are designed to withstand the extreme temperatures of a desert, managing to stay close to 70 °F (21 °C) regardless of outside weather conditions. Earthship communities were originally built in the desert of northern New Mexico, near the Rio Grande, and the style has spread to small pockets of communities around the globe, in some cases in spite of legal opposition to its construction and adoption.

Earthbag construction is an inexpensive building method using mostly local soil to create structures which are both strong and can be quickly built.

This page is a list of construction topics.

<span class="mw-page-title-main">Natural building</span> Sustainable construction practice

Natural building is the construction of buildings using systems and materials that emphasize sustainability. This in turn implies durability and the use of minimally processed, plentiful or renewable resources, as well as those that, while recycled or salvaged, produce healthy living environments and maintain indoor air quality. Natural building tends to rely on human labor, more than technology. As Michael G. Smith observes, it depends on "local ecology, geology and climate; on the character of the particular building site, and on the needs and personalities of the builders and users."

<span class="mw-page-title-main">Papercrete</span> Cement and paper fiber

Papercrete is a building material that consists of re-pulped paper fiber with Portland cement or clay and/or other soil added. First patented in 1928, it was revived during the 1980s. Although perceived as an environmentally friendly material due to the significant recycled content, this is offset by the presence of cement. The material lacks standardisation, and proper use therefore requires care and experience. Eric Patterson and Mike McCain, who have been credited with independently "inventing" papercrete, have both contributed considerably to research into machinery to make it and ways of using it for building.

<span class="mw-page-title-main">Sustainable architecture</span> Architecture designed to minimize environmental impact

Sustainable architecture is architecture that seeks to minimize the negative environmental impact of buildings through improved efficiency and moderation in the use of materials, energy, development space and the ecosystem at large. Sustainable architecture uses a conscious approach to energy and ecological conservation in the design of the built environment.

<span class="mw-page-title-main">Earth structure</span> Building or other structure made largely from soil

An earth structure is a building or other structure made largely from soil. Since soil is a widely available material, it has been used in construction since prehistoric times. It may be combined with other materials, compressed and/or baked to add strength.

<span class="mw-page-title-main">Building insulation</span> Material to reduce heat transfer in structures

Building insulation is material used in a building to reduce the flow of thermal energy. While the majority of insulation in buildings is for thermal purposes, the term also applies to acoustic insulation, fire insulation, and impact insulation. Often an insulation material will be chosen for its ability to perform several of these functions at once.

<span class="mw-page-title-main">Building insulation material</span> Insulation material

Building insulation materials are the building materials that form the thermal envelope of a building or otherwise reduce heat transfer.

<span class="mw-page-title-main">Hempcrete</span> Biocomposite material used for construction and insulation

Hempcrete or hemplime is biocomposite material, a mixture of hemp hurds (shives) and lime, sand, or pozzolans, which is used as a material for construction and insulation. It is marketed under names like Hempcrete, Canobiote, Canosmose, Isochanvre and IsoHemp. Hempcrete is easier to work with than traditional lime mixes and acts as an insulator and moisture regulator. It lacks the brittleness of concrete and consequently does not need expansion joints.

<span class="mw-page-title-main">Light clay</span>

Light clay is a natural building material used to infill between a wooden frame in a timber framed building using a combination of clay and straw, woodchips or some other lighter material.

References

  1. 1 2 Taylor, Charmaine R. "Building for free with "alternative" natural materials". Archived from the original on 18 April 2009. Retrieved 2009-04-22.
  2. 1 2 Craven, Jackie. "Building With Natural Materials". Archived from the original on 2009-02-01. Retrieved 2009-04-22.
  3. 1 2 Edmonds, Molly. "Top 10 Natural Building Materials". Archived from the original on 2009-04-02. Retrieved 2009-04-23.
  4. Kriscenski, Ali. "Amazing Green Roof Art School in Singapore". Archived from the original on 31 March 2009. Retrieved 2009-04-23.