After reading another threads about sinking boats it seems it would be good to start this list of items that vessels should have built-in or requirements to construction for off-shore vessels. EXCLUDING REMOVABLE SAFETY EQUIPMENT
..... FEDERAL REQUIREMENTS FOR RECREATIONAL BOATS
I will start with some items I've noticed that has caused some controversy on what keeps boats afloat. Also I'm defining 'Floodline' as the amount of water
a boat can take before it becomes obvious that it's becoming dangerous to stay inside and could possibly sink. Which could be much different to styles of boats.
Batteries- Kept and/or sealed above a reasonable flood line.
Internal Compartments- Fasteners on their lids/drawers/hatches to avoid dumping of supplies in a blow-down or roll-over.
Wiring- All joints between two lengths of wire or below a flood line to be sealed water
Tanks- To be fully sealed (excluding plumbing) and secured to the hull
for a full roll-over.
Windows/Hatches- Able to take pounding waves.
Drains- Large enough to drain cockpit
in reasonable amount of time (46 C.F.R. PART 178.450)
This is all I can come up with for the moment but may add more later.