David,
Get a book on Naval Architecture and read about GM.
Every boat has the center of gravity above the center of buoyancy.
Weight added alone might not keep it upright.
Matt Colie


David wrote:
I've got an old boat very much like this one:

http://www.warnersdock.com/images/Fr...fores15yel.JPG

that I'm trying to make into a mini-houseboat,
sort of like a camper. I only expect to have
about 200-300 pounds in the roof and walls,
and the roof will only be about 48" above
the gunwale. The hull will weigh a *lot* more
than what is added, so shouldn't that alone
be enough to keep it from being top heavy
and flipping over? If I add weight, like a
couple hundred pound bags of sand down
in the hull to counterbalance, shouldn't
that take care of it? If so, should they
be placed on the sides, or in the center?