This house has been leaking for about ten years now. Every year my dad went up there and put some kind of sealant on it and it would work for a while. I am wanting to rent out this place now but I'm afraid the years of leaking might have caused too much damage to the support to hold a new roof option, which I haven't been able to choose yet. Can anyone help me to decide if I should use roll on rubber or asphalt rolls to cover this roof and stop the leaks and having to re-seal it every year. I don't have a lot of money to spend on this, that is why I've given myself these two options. If you know of a more efficient and affordable way, please let me know. And, how can I be sure that the roofing support isn't all rotted out before applying a new roof?