Unlike placid inland canals, coastal and estuarine floating homes are subject to severe twice-daily vertical movements, corrosive marine environments, and high-wind shear forces.
A floating house on a tidal estuary cannot simply be tied to a cleat on a dock. It requires heavy engineering.
Salt spray degrades standard building materials rapidly. Exterior cladding must be marine-grade (such as acetylated wood, high-density fiber cement, or marine aluminum). Window frames require anodized coatings to prevent pitting and seal failure.
Electricity, potable water, and sewage lines must accommodate the entire tidal range. This is achieved using heavy-duty coiled umbilical systems. A failure in a sewage umbilical during an outgoing spring tide is an environmental and financial disaster. Maintenance checks are required monthly.
If your mooring dries out at low tide, the hull must be engineered to sit on the mud (a "mud berth") without structural deflection. Ferrocement pontoons are ideal for this, whereas lightweight fiberglass hulls may crack under point-loading from debris.