A cob house is one of the most long-lasting forms of earthen building. Cob can resist prolonged periods of rain since the mud mixture is permeable. A lime and sand plaster can be used to protect the outer walls from wind damage. The cobs are built up layer by layer with a mix of clay and straw. They can be as high as three stories if you include the roof which serves as the floor for all levels.
Cob buildings have a distinctive appearance that makes them popular in rural areas where modern housing tends to look the same. There are many different styles of cob houses including half-timbered, timber-framed, wattle-and-daub, and cave dwellings. All types of cob buildings are easy to construct and last for hundreds of years if not rebuilt after a major earthquake or similar incident.
The strength of a cob house depends on how well it's constructed. If the walls are thick enough (usually about 2 feet [60 cm]) then they should be able to withstand heavy snow loads and strong winds. Roofs must be flat to allow air circulation or else mold will grow inside the house. Windows and doors must be opened during storms to prevent injury or death. Fires are difficult to contain in cob structures so firefighters should avoid entering unoccupied homes unless there's no other choice.
Cob houses are very energy efficient.
Cob is a sustainable construction material that may be utilized in place of traditional one-story timber or concrete structures in residential applications. Additional seismic and lateral loading studies are necessary before cob can be incorporated into the California Residential Building Code. Cob's long-term durability remains to be seen, but it does provide an environmentally friendly alternative to conventional building materials.
The principal ingredient in cob is dirt. The finer the soil, the more porous it will be after burning; that is, it will have more void spaces between its particles. Coarser soils will tend to become hard after burning. When making cob, you need to obtain your soil from a location that is not within 100 feet of any residence, school, or hospital. This is because these areas typically have more contamination in their soil due to traffic from many people on foot or driving vehicles. Contaminants in soil can lead to poor air quality inside your home if you decide to use it as an exterior wall surface.
After obtaining your soil, you need to burn it first. You do this by covering the ground where you plan on using cob with a layer of sand (or another heat-resistant material) that is at least three inches thick. Then, you burn all the vegetation within the fire zone for four to six hours. During this time, the oxygen is depleted and carbon dioxide builds up, which is what causes the fire to burn hot and strong.
The longevity and comfort of these priceless dwellings has created a rebirth in historic cob areas like Devon, where cob homes are being erected anew. Why isn't it washed away by rain? Cob is extremely weather resistant. Because of its porous structure, it can tolerate prolonged periods of rain without being weakened. The walls are made of hand-made bricks that are stacked on top of each other with an air gap in between. This allows any water that does get inside to drain out again.
Cob is a type of brick used for building construction that has withstood the test of time and remains popular today. It's known for its distinctive red color which is derived from natural clay deposits in the area. Cob is easy to work with and durable; it can withstand rain, snow, heat, and cold. The key ingredient that makes cob so effective at protecting itself from water damage is that there's no concrete or other materials used in its construction. Instead, there are only natural ingredients such as wood, stone, and clay.
Cob has been used for buildings since Roman times when it was first introduced into Europe. It was also commonly used during the Middle Ages before modern building techniques became available. Today, cob is becoming more popular again because of its unique look and feel that differentiates it from traditional building methods. There are several varieties of cob including Welsh cob, Scottish cob, and Brazilian cob. Each variety has its own characteristics including colors that can be used when building with cob.
In frigid areas, a cob home with insulation and thermal mass can be built. The walls should be at least 2 inches (5 cm) thick to be effective for heat storage. A cob house with thin walls is more fragile and should not be built in high-risk locations.
Cob is an ancient building material that has been used for thousands of years by different cultures around the world. It's made from soil and straw or wood shavings, bound together with animal fat or urine. As it gets wet it dries out again, so it needs to be refreshed periodically. Cob is easy to work with and durable enough for most applications.
There are several different types of cob buildings. Traditional cob structures are dry stacked, which means they are built without any form of support inside the walls. This allows the builder to use very simple tools and avoid complicated techniques. However, traditional cob is often very flimsy and lacks stability. Modern variations on the theme include using steel reinforcing rods inside the wall cavities to give added strength and stability.
Cob housing has many benefits for those who know how to build them. They are environmentally friendly because they are made from natural materials and do not require any fossil fuels to build.
To put it frankly, COB is a poor insulator. This applies to all earthen construction materials. What earthy materials lack in insulation, they make up for in heat retention. Cob (and other earthy materials) absorb heat, hold it, and then slowly release it. This is why cob walls tend to be hot during cold weather and cool during warm weather.
There are two ways to improve the insulation value of cob structures. The first is to use thicker walls. This will help prevent heat from leaving the house through the exterior surface. The second option is to fill the space between the cob with some kind of insulating material. This could be grass clippings, wood chips, or even dirt removed from around your plants.
Thicker walls are easier to build with cob than thin ones because you can work with the materials as they come out of the ground instead of having to cut them to size before you start building. Also, if you run into problems while building, you can simply add another layer rather than re-doing everything. However, this does mean that cob buildings tend to be more expensive than conventional homes built with brick or stone.
Cob is also very dependent on the climate where it's built. In colder climates, you'll want to include some form of insulation inside the house. Otherwise, you'll be heating and cooling a whole lot of air that's not doing much else.