Quick Answer
A clay-based cob house roof should ideally be sloped at a 30-45 degree angle to ensure water runs off easily and prevent accumulation. This angle also aids in snow shedding. A curved or rounded roof line can be achieved by using a combination of earthenware or terracotta tiles.
Sloped Roof Design for Cob Houses
When building a cob house, it’s essential to design a roof with a slope that allows for easy water runoff. A minimum slope of 30 degrees is recommended, but a steeper slope of 45 degrees is ideal. This ensures that water and snow can’t accumulate on the roof, which would put stress on the cob walls and potentially lead to structural issues.
Earthenware or Terracotta Tiles for Waterproofing
Using earthenware or terracotta tiles is an effective way to waterproof a cob house roof. These tiles are permeable, allowing water to pass through while preventing the entry of rainwater. The tiles can be arranged in a herringbone pattern or laid directly on the cob roof surface. To add an extra layer of protection, apply a natural sealant like beeswax or plant-based oils to the tiles.
Considerations for Curved or Raked Roofs
A curved or raked roof line can be achieved on a cob house by using a combination of earthenware or terracotta tiles. This design can be aesthetically pleasing and allows for a more efficient use of roof space. However, it’s crucial to ensure that the roof is properly waterproofed and that the cob walls can support the weight of the curved or raked roof design.
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