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Cob can be described as a highly durable material which can be used for various building work. It is made up of natural building material, including that of clay, soil (or subsoil), water and straw. Cob buildings have been built for centuries; however, it must remain dry for it to remain at such high durability. Hence, the need for rebuild services and repairs. Here at JC Plastering and Lime, we offer the best cob rebuild services in North Devon. For some of our examples, please visit our ‘Cob Rebuild’ tab under ‘Services’ – where you can find various pictures of our work.

Cob can be described as strong and durable as concrete. However, it requires less energy for production and manpower to create he cob mixture. It is also strong enough to be used as a shield against earthquakes. This is because the structure of the building acts as a monolithic piece which causes no cracking as the ground moves below. There are significant benefits to using cob over concrete as a building material, with the biggest benefit that of cob being highly more sustainable and affordable material. Cob material is extremely breathable and does not use any harsh chemicals, which benefits the environment around the structure.

Cob can often show various defects including cracking. This is due to old buildings gradually fading. If these cracks tend to be located around doors or windows for example, the damage can be more severe to if it was located on a wall. Rebuilding and repairing these cob structures offers various advantages, including:

  • Allowing moisture in the structure to move efficiently, not causing any damp infestation.
  • Eliminating hot or cold spots in the walls where thermal movement can cause plaster and render to crack.
  • Comprehensive strength, therefore allowing general movement to be better without detaching from the original structure.
  • Savings in energy consumption, as it allows the recycling of materials.

What is the process of cob re-building?

Firstly, comes the preparation. It is important to ensure that, when using cob blocks for repair, that they are bedded on flat services. Damaged and un-sound cob must be paired back to ensure the best possible result. Second in the process is that of damping. By dampening the surfaces, the cob repairing process can be completed more efficiently. Thirdly is the bedding of mortar. The main aim of bedding mortar is to spread the load of cob evenly. It should be kept at a minimum thickness. Lastly, is the coverage stage. Depending on the shape and size of the repair, the thickness of the coating should be adapted. Throughout the process, eye protection and protective gloves are worn, as lime cob repairing can cause irritation.

For more information on the cob rebuilding process we use, please take a look around our website. Alternatively, get in contact with us today with any queries or questions you may have towards the process. Here at JC Plastering and Lime, we pride ourselves in our top quality servicing and customer services.

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