I’m building a small float to go on our pond. It’s going to be a safe place for our geese and ducks at night. We already built most of it but we don’t have anything to make it float.

It is a 4’ x 8’ frame made of 2×4s, with a ¼” sheet of plywood on top. It weighs about 70 lbs.

Considering it’s relatively small size it’s difficult to find something to make it float. Any ideas?