I bought my house about 4 years ago and replaced the sliding glass doors leading to the back deck with french doors. The problem I'm having is the bottom 3 inches of the door on the hinge sides are starting to root and have black mildew/mold. The step down to the deck is only about 2 inches and also there is no over hang covering it. We get a lot of rain also. Which is causing more problems do you think? Also no gutters. Thanks