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@fallguy, I have no data on shear resistance, but FINNFOAM F-700 XPS is rate for 700 kPa comression, which translates to ~101 psi. Thanks to @Rumars I go now through related conversations and there is a wealth of observations there I need to consider seriously. A lot of food for thought here...

Thank you for showing me direction. I will dig deeper into it.

I certainly will, when the time comes, and will be happy to share my findings. For now, as I mentioned, I am in search for any similar projects already completed or abandoned. I do not believe I am the first person who had such an idea, so the reasonable way is to start from leaning on my...

I am going to build a truss of aluminum sqare tubbes, using XYZ nodes (reference: manual for XYZ NODES http://www.n55.dk/MANUALS/XYZNODES/xyznodes.html) The truss will be built and tested separately, later anchored to pontoons (exact method to be detemined). Considering the estimate size of...

Greetings from Poland. For 2024 I plan to build a small platform (3x6m) pontoon catamaran, being a far-fetched derivative of ferroconcrete constructions. Pontoons will be made of heavy-duty XPS (Extruded Polystyrene) foam panels,(such as SOPRA XPS 700 - Soprema United Kingdom...