cob wall construction details

The clay content of cob can vary depending upon the subsoil used but is usually in the range of 10% to 20%. Let's have a look: Building with cob is much easier that modern conventional construction. Because of the comparative lack of modern experience with Cob in New Zealand, the technique is included in the Earth Building Standards only as an informative section. Stairs Construction.

Michael G. Smith has a background in environmental engineering, ecology, and sustainable resource management. This allows subsoil with a lower moisture content to be placed which reduces the amount of shrinkage while also allowing greater compaction of the material as it is contained within the shutters. Site design and Because of its relatively low weight, it isn't suited to contribute to the thermal mass of a building so much.

It is also found in other areas of the British Isles: South West Wales where it is known as Clom; North West Cumbria where it is known as Clay Dabbins; in small areas such as around Haddenham in Berkshire where it is known as Wichert; and in an area south of Stratford-upon-Avon in Warwickshire and across into the area between Leicester and Northampton. For the colder regions of New Zealand it could be an interesting option, even if the framework can require as much timber as a stud wall. The other main method is to place the subsoil between shutters or formwork. It traditionally has been used in many structures around the world, some of them up to seven storeys high (Germany and Yemen). Timber Frame Wall Construction. First Floor Internal Partitions.

Light Earth is very common in Germany, where the insulation properties of this construction are highly valued. Fixing things to walls (such as shelves, pictures, furniture etc.) One difficulty with Rammed Earth is that strict limits have to be placed on shrinkage to eliminate cracking. Home The surface of the wall can be additionally sculpted to a certain degree, while the earth is still damp.

This is particularly useful where the clay content of the soil is high. It is often seen as old and outdated and the local population have a desire to vacate such buildings in favour of new brick or concrete houses. Building consents for this technique have to be processed under the "alternative solutions" pathway of the Building Code. Cob provides extra thick and sculptured walls easily, but the construction is shrinkage prone, calling for careful selection of materials and construction detailing. On the inside the walls can be finished off with an earth plaster. Please navigate through the Table of Contents to conveniently access data and information to keep your construction in compliance with City Code. It also means that there is a vibrant and well established network of builders who are experienced in the repair and maintenance of cob as can be seen in the list of Cob Builders. In New Zealand, Rammed Earth is the most popular earth building technique next to Adobe brick and pressed soil-cement brick construction. For a building consent a Light Earth construction has to be processed under the "alternative solutions" pathway of the Building Code. Earth Plastering. Often cement or hydrated lime is added to improve durability and for shrinkage control. The earth is tamped between shutters with manual or pneumatic rammers. Cob can be mixed by foot - we'll show you on our cob building workshops how to do the 'cob dance'. Mud Floor Construction. Below are some important elements to remember during the construction process. The construction is fireproof and very durable, because the clay acts as a natural preservative of the timber construction. | Website by "Web Design in Cornwall". Cob is just one form of earth building construction used throughout the world. In the chalk areas of Dorset, Wiltshire and Hampshire, buildings formed with rammed chalk and chalk cob can be found. document.write (dayName[day] + " " + date + suffix + " " + monthName + " " + year); Select to watch many of the services and skills performed on our YouTube Channel, Leslie CornellUnit 13/14 St Austell Bay Business ParkPar Moor RoadSt AustellCornwallPL25 3RF, Tel: 01726 337577Mob: 07851 153 683Email:, Sitemap | Website Legal | Partner Links | Login, Copyright © 2020 Leslie Cornell Building Restoration Ltd. All Rights Reserved. Cob construction involves layering a mix of gravely clay and straw directly onto the emerging wall without the use of mortar or a framework.
Cob walls are usually load-bearing. It is essential that the cob contains clay as this acts as the binder to the soil particles and gives it its strength. ... Cob Constructions has a helpful staff for a complete calculation of products required or advised so you get the most appropriate product for your needs. depends on the structure of the wall. Structural Considerations for Cob Buildings. Rammed Earth walls are formed from soil that is just damp enough to hold together. Rammed earth (pise de terre) is an ancient technique that has been dated back to at least 7000 BC in Pakistan. / Cob During the summer months a lift can be introduced each day. Although most rammed earth buildings today are single- or two-storeys, a five-storey hotel has recently been completed in Australia.

A sandy crumbly soil with a clay content around 15% is best. Traditionally, cob walls are constructed in lifts, sometimes as high as half a metre. Construct a stone plinth for the cob wall to be built on so that it does not come into direct contact with the ground. Bale-Cob. This too is an old technique, which has often been used in medieval Europe. Together with the earth mix very firm "objects" up to 2 meters high can be built. Building consents for Cob can be obtained, but it would have to be processed under the "alternative solutions" pathway of the Building Code. Cob and Lime Specialists Cornwall and Isles of Scilly - Cob Repairs Cornwall and Isles of Scilly - Cob Assessment Surveys Cornwall and Isles of Scilly - Building Restoration Cornwall and Isles of Scilly. For more information about constructing with cob, please visit our website. Wattle and daub starts with a lattice of vertical studs and horizontal wattles, worked together like a basket. This is most likely to have occurred due to the mixing process which may have been carried out using cattle, contained within a pen with the subsoil and straw, so that after a period of time the material becomes mixed by the treading of the animals' hooves. Without the fibrous material, which is usually straw, the cob would slump off the top of the wall while it was being compacted and is added primarily to aid the placing of the wet subsoil on the wall. As with all buildings, you need to start with a good foundation.

Make sure you have a good overhang on your roof to protect the cob wall. today=new Date(); date=today.getDate(); month=today.getMonth()+1; year=today.getFullYear(); var dayName=new Array(7) Pre-formed cob blocks are produced and sold in the South West of England and are often used for the repair of existing buildings where larger areas of wall are to be replaced. If too much clay is present in the subsoil, it will lead to excessive shrinkage and cracking of the wall as it dries. First Floor Construction. The walls are often left as they are "off the form" and reveal an appealing strata pattern from the ramming process. The wall can range from 150 to 200 mm in thickness and this makes the technique attractive for dividing interior spaces with light walls. There is a lot of modern experience with this technique in Europe, but not in New Zealand. It is often said that dung is included in the mix. if (month==1) monthName=("January"); else if (month==2) monthName=("February"); else if (month==3) monthName=("March"); else if (month==4) monthName=("April"); else if (month==5) monthName=("May"); else if (month==6) monthName=("June"); else if (month==7) monthName=("July"); else if (month==8) monthName=("August"); else if (month==9) monthName=("September"); else if (month==10) monthName=("October"); else if (month==11) monthName=("November"); else monthName=("December"); The rough surface is later trimmed up and usually rendered, which leads to a soft, undulating look of the walls. This technique is also suited for a more experimental approach to Earthbuilding. Wattle and daub walls are non load-bearing and are built into a wooden framework. The Rammed Earth technique is accommodated in the New Zealand Earth Building Standards. Cob is an old technique. Cob Wall Details. These include: a gravel foundation to stop the capillary action of water, a 50cm stone or brick stem wall to keep the cob off the ground, a roof that overhangs by about 50cm and a lime render on the external walls. ©2012 Barry Honeysett. Cob is a walling material that is formed with subsoil without being modified by subjecting it to heat such as baking that forms clay bricks or by adding cementitious material to it. A mix of earth and straw is then daubed onto this latticework, forced into the gaps and smoothed over to fill any cracks. Cob has been used in construction for hundreds of year and many of these buildings are still standing today. Earthbuilding Construction and Adobe Brick Manufacture, Cactus Software - Nelson Web Design & Hosting. Cob has been used in construction for hundreds of year and many of these buildings are still standing today. Other websites of interest concerning earth buildings: Earth buildings are found throughout the world -. The construction acts more as a form of insulation, and therefore is mostly specified for external walls. WebToys. For most areas of the world, earth construction is seen as low status and of little value, used only by the very poor. All rights reserved | The South West of England is therefore probably unique in having a high concentration of earth buildings which are not only seen as desirable but are also extremely valuable. The surface can be left as a rustic finish or rendered for a smoother finish. development by If you require our assistance, please Contact us. Cob is the predominant earth walling technique found in the South West of England. Looking for online definition of COB or what COB stands for? The wall is formed by placing the wet cob mix on top of the construction previously laid and compacting it by treading and beating the material. This however isn't always necessary, as many successful structures have been built just from suitable soil without such additives. As a censequence, the proper maintenance of these buildings is financially viable and expected. This technique is very labour intensive and requires a lot of experience.

Roof Construction. The other main methods are to form blocks or bricks of unbaked earth which are pre-dried. The advantages of constructing with cob far outweigh the disadvantages. Consistent workmanship is critical for both the appearance and the strength of Rammed Earth walls, so site work has to be of high quality. We can also submit and organise council & engineering details for our clients. But the technique is seldom used here nowadays and is not covered by the NZ Standards. Especially on South Island there are many old Cob cottages and homesteads which are still in good condition. COB is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms The Free Dictionary The shutters can be removed immediately after completion of a wall panel. Light Earth involves tamping a clay mix containing a lot of straw or untreated woodchips into a timber framework and then cladding both faces. Windows & Doors.

Next to Adobe brick construction it is the most common earthbuilding technique used by the early settlers in New Zealand. In 1993, along with Ianto Evans and Linda Smiley, he started the Cob Cottage Company, a research and teaching group focused on reviving and improving traditional forms of earthen construction. This needs careful attention, because the wrong exterior finish can result in serious damage of the Light Earth filling.

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