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How do I waterproof my cob? (video)
What are the ingredients in cob?
Cob, cobb or clom (in Wales) is a natural building material made from subsoil, water, fibrous organic material (typically straw), and sometimes lime. The contents of subsoil naturally vary, and if it does not contain the right mixture it can be modified with sand or clay. via
How long do cob house last?
How long does cob last? The oldest cob house currently standing is 10,00 years old. If this doesn't speak to how strong and durable cob houses are, then nothing will. Cob houses are built to stand forever as long as their roofs are maintained, and they are properly looked after. via
How long does cob need to dry?
Once you make your cob, it will need to dry out full and that can take months to years. The bulk of the moisture will dry out of the walls in the first year, but will not fully cure for 1-2 years past that. Once you build the house and add a roof, you should allow it to breath for many months before moving into it. via
What happens if cob gets wet?
There's all kinds of issues with that but when we look at cob and earth materials what's special about them is they are vapor permeable so water can get into them, but then it naturally releases from the walls so even if your walls get wet they're going to have a chance to naturally air out and dry out and there's no via
Can cob walls get wet?
It's also water-resistant. The area containing the cob oven and seat isn't protected from the rain. Yet the cob has stood its ground. via
Can you make cob without sand?
You want to use construction grade sand or river sand. You do NOT want to use fine beach sand - save the fine sand for the plaster. Rougher sand particles are better for making a strong cob mix. via
Is cob a good insulator?
Put bluntly, cob is a pathetic insulator. This goes for any earthen building material. Cob is also a very poor conductor of heat and has very low thermal conductivity. Meaning, heat from outside has a much harder and longer time to transfer through your walls and inside your home. via
Can you use hay in cob?
Hay is prone to sprouting and could make your cob walls look like a giant chia pet! It is also prone to rotting. As they say, hay is for horses. Don't use it for cob! via
Does cob wash away?
Why doesn't it wash away in the rain? Cob is very resistant to weathering. Because of its porous nature, it withstands long periods of rain without weakening. However, too much exposure is best avoided by the "boots and cap" strategy: wide roof eaves to protect the walls and an impervious foundation. via
Can you have electricity in a cob house?
Insulation, Wiring and Plumbing
It is indeed possible to have indoor plumbing and electricity in a cob home, but you need to make this decision before you begin building the home. The electrical wiring goes in between your cob walls so it should be decided on beforehand. via
Do you need planning permission for a cob house?
Cob houses can be built in any style you want. Garden studios usually don't need any planning permission, unless you live in a conservation area. via
How do you cook cob fast?
Can cob houses be built in cold climates?
When you think about cob, you need to kind of think about it not having any insulation value at all. So technically, there's about an R3 insulation value for a foot thick wall of cob. These are just concrete walls and people are fine in these buildings in cold climates. You just need a heat source inside. via
Why is my cob cracking?
A: Cracking in the walls as they dry indicates that you have too high a concentration of expansive clay in your mix. Most cob in the USA has a lot of both sand and long straw added to the clay soil. The lime you have added may be making the problem worse since lime also shrinks as it dries. via
Are cob houses expensive to build?
Cob house cost
A decent cob house can be built for anything ranging around $4,000 – $10,000. However the cost can vary depending on the climatic condition, location and the size of the house. The basic cost, however, may lie somewhere around $2000 – $5000. via
How do you seal cob walls?
A: Linseed oil and lime plaster are both sometimes used to seal cob against weather. However, I wouldn't recommend either of them for an oven. When you bake something like bread in an oven, it releases an enormous amount of water vapor as it cooks, much of which is absorbed into the oven wall. via
Are cob homes safe?
Since soil is used as the base material for the building it is almost completely fireproof and termite-proof. This makes cob house one of the safest DIY homes that one can go for. via