So about 10 or so years ago, an aluminum roofing portion was added onto our house. Half of the back porch was done in screen and half of the back porch was done in aluminum paneling. The cracks between the panels have been leaking pretty much since they have been here. The roof is at a very small angle but it does drain as it is supposed to, just a little bit slower of a flow. The gutters are also set up wrong in my opinion, they are square with 2 outlets, neither of which are at the dead head of the flow. Anyways, I was wondering if you guys had any suggestions on sealing the cracks between the aluminum panels. Sorry for the long post.

I have a deck board that is cracked. A portion of it has fallen off and there is a 4"x6" piece missing. You can see the ice and water shield. First off, should I be concerned about this? Its likely been like this for many years without incident of leaking. Is it typical to repair decking (in this case boards) from the attic space without having to tear off and reshingle? Should I simply leave it alone or should I get piece of a wood cut to fit between the joist and cover it? Or something else?