Thin Shell Ferrocement
Concrete shell building has 2 main fields
A) Ferrocement Boat Building (Mesh wire based method)
B) Structural Concrete Building (Cast method used in civil engineering)
Both Methods has been used to create floating structures. Ferrocement is used in boatbuilding while structural concrete building is used for industrial floating structures like oil and gas platforms.
Especially concrete cast structures like Troll A and the Nkossa Barge have been acnowledged to have a maintenance free service life of 200 years in marine environment what makes them a top option for the purpose of seasteading. Drawback of concrete cast structures is that the shell thickness has to be some 10cm as a minimum - the structures will be too heavy for normal "boating purpose" so the method was never used on a large scale in boat building but opens great possibilities for hulls where light is not a design goal - this is industry, seasteading, and submarine applications.
Mesh wire based Ferrocement structures on the other hand can be performed in much thinner layers and has achieved certain popularity in yacht building - the drawback is that the service life depends strongly on the building quality and is less favorable than for concrete cast structures.
One of the seastead designs based on concrete cast structures is the Seastar Platform
Seastar Platforms bring the benefit of industrial floating concrete structures to Single Family Seastead building.Among those are mantenance free operation, low cost per squaremeter of living space(compareable to US and European housing prices). They are scaleable, repairable, and can form part of a "seastar grid comunity".
Concrete cast shell structure building - submarine habitats, submarine hotels, submarine yachts. European Submarine Structures AB
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