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A: There is no inherent size limitation on cob or any other building system that I know of. If you look in the literature you will find cob mansions in England and cob towers in South Yemen nine stories high! That being said, cob walls can take a lot of work to build, as do most other natural building techniques.The problem is, there’s no building code provision in much of California for cob houses, so most of the legal structures are 120 square feet or less to avoid the requirement for a building permit.One of the main reasons is labor costs. Building with cob or any kind of earthen material is very labor-intensive so that’s going to raise up your labor cost. Unless you’re doing it by yourself as a do-it-yourself builder you’re going to have those extra costs involved. So that’s one good reason to do it yourself.
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How large can you build a cob house?
The problem is, there’s no building code provision in much of California for cob houses, so most of the legal structures are 120 square feet or less to avoid the requirement for a building permit.
Is building a cob house worth it?
One of the main reasons is labor costs. Building with cob or any kind of earthen material is very labor-intensive so that’s going to raise up your labor cost. Unless you’re doing it by yourself as a do-it-yourself builder you’re going to have those extra costs involved. So that’s one good reason to do it yourself.
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Are cob houses strong?
A cob home is one of the most durable types of earth architecture. Because the mud mixture is porous, cob can withstand long periods of rain without weakening. A plaster made of lime and sand may be used to windproof the exterior walls from wind damage.
How long can a 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.
How thick do cob walls have to be?
Cob has several other important characteristics, firstly walls are usually very thick, typically 2-3 feet and this, as well as being very good insulation against heat and cold is a massive heat store. So there is a fly-wheel effect on thermal movement – in other words, cool nights and warm days are evened out.
Why are cob houses so cheap?
The raw materials for cob are cheap: soil, aggregate, straw, and water. But you also need to factor in the huge amount of labor to process these materials into cob or whatever earthen material you’re using. And the cob walls are only one portion of the whole building.
Can you get a mortgage to build a cob house?
Cob houses are generally acceptable to most mortgage companies, but it is worth checking with a financial advisor before making a mortgage application. Like many other older building methods, thatched roofs offer excellent thermal properties, as well as looking particularly attractive on the top of an old cottage.
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Is cob a good building material?
Cob is fireproof, 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.
What are the disadvantages of cob houses?
The preliminary disadvantage of a cob house is that its labor intensive. Most people get discouraged from building a cob house solely because of the time and labor it requires. Another con of a cob house is that it can not endure wetness.
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Are cob houses warm?
Put bluntly, cob is a pathetic insulator. This goes for any earthen building material. But what earthen materials lack in insulation properties they make up for with thermal retention. Cob is also a very poor conductor of heat and has very low thermal conductivity.
Are cob houses fire proof?
Cob: The high thermal mass of thick, earth-based cob walls are also extremely fire resistant.
Can cob houses withstand 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.
Are cob houses soundproof?
Build a cob home for your family and it will last for many many generations to come. Earthen walls have very good sound-absorbing properties that keep it quiet inside, both from exterior noises and noise generated in the same building.
Are cob walls load-bearing?
You can also make the walls as beautifully sculptural if you wish. The construction should be fairly straightforward. Read either “The Cobber’s Companion” or “The Hand-Sculpted House” for help with the mix proportions, mixing and building techniques. Because the walls will not be load-bearing, they can be quite thin.
Does cob need insulation?
People always build concrete buildings and cinderblock buildings in cold climates. These buildings are not insulated. These are just concrete walls and people are fine in these buildings in cold climates. You just need a heat source inside.
What happens when a cob house 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 …
What’s the difference between adobe and cob?
The most basic difference is that adobe is formed into rectangular bricks which are dried in the sun before being used, while cob is built wet. Cob therefore lends itself to organic shapes: curved walls, arches and vaults.
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How much does it cost to build a cob house in Florida?
You can build a small straw bale or a cob cottage for as little as $30,000, while a three-bedroom house can cost around $60,000. The cost can get as high as $90,000 for larger homes, nicer finishes, or additional insulation.
Where is the oldest cob house?
Oldest cob home in New Zealand. In rainy New Zealand that substantial hat is especially important.
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