1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar

Concrete flat raft shell structure – start building – budget

Home Forums Archive TSI Engineering Concrete flat raft shell structure – start building – budget

This topic contains 8 replies, has 6 voices, and was last updated by Profile photo of Alan Alan 5 years, 2 months ago.

Viewing 9 posts - 1 through 9 (of 9 total)
  • Author
  • #1314

    To sum up some statements of other threads – how to apply seasteading is clear, (concrete shell structures rafted up to a mega structure similar to a floating marina development – model plan – palm dubai) .

    The general size of modules “family home size”.

    The budget 5k – 100K per family sized platform. Is there really a person out there to put 5-100k on the table to create a concrete shell structure that could work as a “seed seastead”…


    Asociated Threads: (important reading to understand conclusions that are base of this thread)


    Apply Seasteading Concrete Shell Structures

    Floating Drydock to start Seasteading

    Aquaculture from a floating concrete shell platform


    Let me hear your thoughts…



    European Submarine Structures AB

    Profile photo of OCEANOPOLIS

    It seems that we started the same thread. Shud we compound them in only one place?

    Profile photo of Farmer

    but I am not sure this software allows the moderators to do it.

    Ironically the free forum software is better these days because 1) More users are familiar with it and 2) Amateurs have added more bells and wistles for free than even microsoft could write.

    Back to the question at hand: Five thousand, sure. 100 thousand? no. Not unless I have a place to live when it’s done.

    EDIT: If you had a catalog we could get a better picture of what 5, 20, 100 thousand U.S. would buy us.

    Profile photo of xns

    Ellmer, what about that 1 cubic meter module we saw you testing in the photos? Those can’t possibly be $5000 each…

    King Shannon of the Constitutional Monarchy of Logos.


    What you see here on the fotos is our worksite of modules of concrete as we float them out and raft them up. What we do is richard sowas spiral island on steroids (our floats have 1000 liter of bouyancy instead of 1 liter of a pet bottle). We also do Ephemerisland more permanent as those modules will not rott away in 200 years (different to the barrils).

    The reason why i am speaking of seasteading with a 5000 USD budget is that it looks feasible to build and connect some 30 of the modules that you see on the fotos below to a 30 squaremeter platform with this budget (as soon as things are optimized in the sense of know how and series production.)

    This would be a “seed platform” you can step on, work on, and you can expand with your own work at a rate of 1 squaremeter per day.

    So 5000 USD would make you kind of land housing independent and get you floating on the water with a reasonable housing space. – just put a hut on the platform get your camping gear in and take it from there.



    European Submarine Structures AB

    Profile photo of

    How are you connecting them? I haven’t seen any provision for that, unless you intend to do a concrete surface/platform.

    As for rafting them up, I assume that you are just adding a bit of water, to level them, then pumping it out of all of them, after connecting.

    Why not pontoons? That cube profile and all the space between them is going to be drag inducing. With some sort of eye to fluid dynamics, some sort of hull shape needs to emerge, to aid in moving the platform… Not necessarilly compound curves, maybe 1/2 cubes, cutting a diagonal through two opposite sides, from one corner to its’ opposite… At least it would help and with a single square facet to use against the hull segment, like you have in the pictures… Corner pieces could be done in a similar manner, cut a cube diagonally from one bottom corner, across the adjoining sides…

    Could pull them from a shore facility with a faceted bow/stern piece, in a pontoon of cubes, remove the ends, connect a row at a time…



    Never be afraid to try something new…

    Remember, amateurs built the ark, professionals built the Titanic.


    When connecting concrete float modules, the apropiate technique is, to take what is done in land based construction sites and adapt it for floating construction – there are many examples of precast parts that are connected to bigger structures. The techniques used for that are “grouting”, “posttension”, and “cast joints”, the modules allow to apply any of those techniques.

    The general answer to ” why not change to X ” is because we wanted a optimized process to build low cost, continous growing, platforms of unlimited size, we optimized the process to work optimized for that purpose and changing the process to “something else” would “un – optimize” the process again sending us back to the starting line.

    This does not mean that this is the only way to build platforms, there are hundreds or thousands of ways to build different platforms at different cost, optimized for different purposes. There must, and will be multiple answers how to implement floating platforms. Our focus was “most simple”, “most cost efficient” and “most process efficient” in caribbean environment.

    Things like streamlining for better mobility i would see as a secondary goal that can easyly be achieved by secondary streamline fairings when the need comes up.

    We believe that there is no “technical” answer to a question like: ” what is the best platform building method?” or “what size or shape should a base module have?” – the answer to that question should be given by the platform buyer . In a ideal seasteading world there would be a wide range of different competing “commercial platform offers” and buyers would choose according to their needs and pocket size.

    What we are trying to figure out is how can we do the “basic homework” of building floating platforms efficiently – and at what “cost planet” and what “business plan planet” we are going to land if we do a simple pilot project. At the moment the figures look promising – looks that we can have a low end seasteader float out at USD 5000 – and squaremeter prices that match “suburban housing” on land. Seasteading looks promising from that angle – so we will do a bit more and see what we get.



    European Submarine Structures AB

    Profile photo of Farmer

    You are nearing the finish line. Well, the starting line at least.

    Can I suggest that a single novelty item for sale could jump-start the whole thing economically?

    Suppose you built a concrete barge dressed-up more for cute than useful: imagine a 20 m X 20 m surface with a small hut, a dock and a few mangrove trees on it. You then list it on ebay as a “private floating island” for sale. Of course some position control would be necessary just to satisfy the legal requirment.

    I suspect that many people look at private island listing who have no hope of affording a real one but would be able to afford yours.

    You could also use it as the “model home” real-estate agents use to sell houses that have not been built yet.

    Profile photo of Alan

    I’m liking what I’m seeing from both Ellmer and xns. Good work, both of you.

    As an aside, I recently bought some land in Charlotte where I hope to build a monolithic concrete home, which, if it were turned upside down wouldn’t be a bad shape for a barge. I know it’s not directly related, but I figure it will give me a chance to learn a little about the process, and maybe give me a chance to experiment with a few variations. Besides, the lots are in a good location so I should be able to sell at a profit if I need to.

Viewing 9 posts - 1 through 9 (of 9 total)

The forum ‘TSI Engineering’ is closed to new topics and replies.

Posted on at


Written by